—The paper describes principles of angle of arrival estimation using an anchor and a tag which ar... more —The paper describes principles of angle of arrival estimation using an anchor and a tag which are built around Decawave's DW1000 impulse radio ultra-wideband IC. Typical experimental results are provided that show the performance of Decawave's AOA demo kit based on this architecture. Keywords—Angle of arrival (AOA); Impulse Radio (IR); Ultra-Wideband (UWB); Real Time Localization System (RTLS).
The 15th International Symposium on Wireless Personal Multimedia Communications, 2012
The paper investigates chirp pulse compression as a signal dimension reduction technique in non-c... more The paper investigates chirp pulse compression as a signal dimension reduction technique in non-coherent Impulse-Radio Ultra-Wideband (IR-UWB) communications. Two common types of non-coherent IR-UWB detection are considered, energy detection of IR-UWB Pulse Position Modulated (PPM) symbols and sample-wise differential detection of Differential Phase Shift Keying (DPSK) IR-UWB symbols, as well as a newly introduced sample-wise differential detection of IR-UWB PPM symbols. A common problem with these low-complexity IR-UWB detection schemes is poor performance when the dimension of the symbol in detection is high, which is usually the case at low data rates and is especially pronounced in interference environments. Chirp pulse compression mitigates this problem by reducing the dimension of the symbol in detection by using a very small fading factor, which also lowers the computational complexity in the case of digital implementation. In the analytic part of the paper, we develop a closed-form expression for the bandwidth and dimension of the signal after the chirp pulse compression, which was lacking before. Furthermore, a closed-form expression of the bit error probability in white noise with the above detection schemes is also given. In the numerical part of the paper, we compare the performance with and without chirp pulse compression of the above modulation/detection pairs in noise and interference environments.
2014 21st Ieee International Conference on Electronics Circuits and Systems, Dec 1, 2014
The paper analyses several modulation and detection pairs for Impulse-Radio Ultra-Wideband (IR-UW... more The paper analyses several modulation and detection pairs for Impulse-Radio Ultra-Wideband (IR-UWB) Body Area Networks (BANs). First, transceiver architectures with and without chirp pulse compression are described. After that, exact expressions for the bit error probabilities in noise are given. At the end, numerical analysis is performed that includes performances in noise and performances in multiple access interference, which are especially critical for medical IR-UWB BANs.
International Journal of Ultra Wideband Communications and Systems, 2011
In this paper, several aspects of IEEE 802.15.6 DPSK IR-UWB physical layer for usage in the medic... more In this paper, several aspects of IEEE 802.15.6 DPSK IR-UWB physical layer for usage in the medical BAN are examined. First, the types of the waveforms used in the standard are given. After that we describe the packet structure. We also provide mathematical analysis of two receiver structures: the duty-cycled sampling receiver and the chirp receiver is provided with suitable digital detection methods definitions and analysis. The paper continues with developing a method of synchronisation for preamble structure described in the standard draft together with the synchronisation frame delimiter (SFD) detection method. Preamble structure itself is discussed together with offering an alternative that has better performance with less computational complexity. The performances of receivers designed according to specifications given in the paper are simulated in multi-BAN environments in order to verify robustness of such BAN devices to interference from co-located BANs, essential for the application of this physical layer in the medical BAN.
Proceedings of the 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies - ISABEL '11, 2011
In this paper we present receiver design considerations and performance analysis for physical lay... more In this paper we present receiver design considerations and performance analysis for physical layer of low datarate non-coherent Ultra-Wideband Impulse Radio (UWB-IR) communication systems. Such UWB-IR systems are of particular interest in wireless medical Body Area Networks (BAN); in medical BAN amount of traffic is relatively low, however, reliability of communication under body-shadowing and interference conditions is of utmost importance. Two non-coherent modulation/detection schemes are treated analytically and numerically through noise and interference performance studies. Particular attention is given on the performance enhancement achieved by the compression of the received signal by the methods previously introduced by authors.
2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC), 2012
ABSTRACT This paper investigates possible amendment of the IEEE 802.15.6 standard for Body Area N... more ABSTRACT This paper investigates possible amendment of the IEEE 802.15.6 standard for Body Area Network (BAN). Particularly, we study amending the IEEE 802.15.6 Impulse-Radio Ultra-Wideband (IR-UWB) DPSK Physical Layer (PHY) through adding data rates lower than what is currently both the lowest and mandatory data rate of this PHY. The motivation for this study is enhancing link margin and, more importantly, enhancing PHY's multi-BAN interference resistivity, crucial in medical applications of IEEE 802.15.6 BAN. Three different possibilities of adding lower data rates are considered. The first is increasing transmitted waveform duration and thus symbol rate; the second is introducing a spreading sequence and using current mandatory data rate symbols as chips; the third is introducing an inner convolution code for concatenation with the existing BCH(63,51) block code. Performances of these communication schemes are studied in multi-BAN interference.
2012 6th International Symposium on Medical Information and Communication Technology (ISMICT), 2012
The paper describes technique for differential detection of Impulse Radio Ultra-Wideband (IR-UWB)... more The paper describes technique for differential detection of Impulse Radio Ultra-Wideband (IR-UWB) Pulse Position Modulated (PPM) symbols. An expression for probability of error in noise is derived. The numerical results show the method's performance enhancement compared to the energy detection in noise and considerable performance enhancement in multiuser interference. The method is applicable to the mandatory mode of the IEEE 802.15.6 Body Area Network (BAN) IR-UWB standard.
2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013
In this paper, we propose a novel type of Impulse Radio Ultra-Wideband (IR-UWB) beamforming struc... more In this paper, we propose a novel type of Impulse Radio Ultra-Wideband (IR-UWB) beamforming structure that we named a chirp beamformer. It represents an alternative to the well-known correlation beamforming paradigm. The chirp beamformer uses a chirp pulse as a symbol waveform. In comparison with a correlation beamformer, the chirp beamformer requires considerably lower timing resolution in cases where the IR-UWB symbol consists of a relatively long single uninterrupted waveform, as in the mandatory modes of two of the IEEE 802.15 IR-UWB standards, namely IEEE 802.15.4a-2007 and IEEE 802.15.6-2012. Furthermore, the bandwidth of the signal that the chirp beamformer generates in the baseband is considerably lower than in the case of the correlation beamformer. Hence, in the case of digital baseband signal generation, the chirp beamformer requires a considerably lower sampling rate than the correlation beamformer. A method for shaping the beam pattern of the chirp beamformer is also described. All concepts introduced are illustrated by numerical examples.
EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439), 2001
The novel method for the suppressing the antenna array radiation pattern sidelobes while keeping ... more The novel method for the suppressing the antenna array radiation pattern sidelobes while keeping the main lobe width constant has been proposed. The method is based on the IRLS algorithm, which has found wide application in the field of radar pulse compression. The algorithm is not restricted by the array geometry and the mutual element coupling and has no limitations regarding the array excitation coefficients and array radiation pattern. In comparison with the ECF method it showed much better results in the sidelobe suppression. The algorithm implementation is simple and straightforward.
2014 IEEE Ninth International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP), 2014
The paper proposes a novel Trellis Coded Modulation (TCM) scheme for coherent Impulse-Radio Ultra... more The paper proposes a novel Trellis Coded Modulation (TCM) scheme for coherent Impulse-Radio Ultra-Wideband (IR-UWB) IEEE 802.15.4a communications that, in comparison with the current IEEE 802.15.4a IR-UWB communications scheme, is able to reduce energy per bit consumed in the receiver two times with approximately 2 dB performance loss. Furthermore, changed in the IEEE 802.15.4a coherent IR-UWB radio required to implement proposed TCM are minimal. Downside is that the proposed TCM scheme cannot be detected by non-coherent receivers. Discussion starts by looking at the current IEEE 802.15.4a IR-UWB coding and modulation scheme as a rudimentary TCM. After that, a transition is made through the TCM framework from the current IEEE 802.15.4a IR-UWB coding and modulation scheme to the proposed one.
2010 IEEE 21st International Symposium on Personal, Indoor and Mobile Radio Communications Workshops, 2010
In this work differentially coherent communication schemes for Impulse Radio Ultra-Wideband (IR-U... more In this work differentially coherent communication schemes for Impulse Radio Ultra-Wideband (IR-UWB) that transmit single uninterrupted package of energy per symbol, expected to be included in the IR-UWB IEEE 802.15.6 wireless Body Area Networks (BAN) standard are considered. Models for two receiver architectures, suitable for such communication schemes and feasible to implement in current CMOS technology -duty-cycled sampling receiver and chirp receiver are derived. After that, two differential detection techniques for employed receiver architectures -ordinary DPSK and Sample-wise DPSK (S-DPSK) are described. Theoretical analysis of probability of error for S-DPSK is also provided. Performances of the sampling and the chirp receiver architectures with DPSK and S-DPSK detection methods employed are analyzed under narrowband and Frequency-Modulated UWB (FM-UWB) types of interference.
2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007
In this paper, a method for the design of non-linear phase, full-band, UWB pulses that satisfy an... more In this paper, a method for the design of non-linear phase, full-band, UWB pulses that satisfy any given spectrum mask is described. The method uses convex programming in each step of the iterative procedure that updates the phase distribution of the goal function. Thanks to its mathematical structure, method performance is much better than the performance of similar methods found in literature. Techniques of adapting pulses waveforms for the cognitive radio applications are described; pulses waveforms are modified in order to achieve low interference to the victim systems.
Proceedings of the 8th International Conference on Body Area Networks, 2013
In this paper we present analysis of the physical layer performance of an system with the On-Off ... more In this paper we present analysis of the physical layer performance of an system with the On-Off Keying (OOK) modulation. We begin with developing a system model with describing three different receiver architectures; namely, coherent quadrature sampling receiver, envelope sampling receiver and energy detection receiver. Performances of these receiver architectures are compared in noise and Multiple Access Interference (MAI). Furthermore, the performance comparison is made in three different phases of the packet reception: preamble synchronization, Synchronization Frame Delimiter (SFD) detection and payload detection.
2011 5th International Symposium on Medical Information and Communication Technology, 2011
The paper develops a method of synchronization for synchronization header (SHR) structure describ... more The paper develops a method of synchronization for synchronization header (SHR) structure described in the draft of IEEE 802.15.6 standard for body area network (BAN) and its Impulse-Radio Ultra-Wideband (IR-UWB) physical layer (PHY) with differential phase modulation. Uniqueness of this PHY is that transmitted waveform shape is not known to the receiver at the time of synchronization and therefore classic synchronization methods based on correlation cannot be employed. Based on the developed synchronization method, synchronization performances with the different SHR structures are evaluated and solutions are suggested for the SHR structure described in the standard.
The paper investigates chirp pulse compression as a signal dimension reduction technique in non-c... more The paper investigates chirp pulse compression as a signal dimension reduction technique in non-coherent Impulse-Radio Ultra-Wideband (IR-UWB) communications. Two common types of non-coherent IR-UWB detection are considered, energy detection of IR-UWB Pulse Position Modulated (PPM) symbols and sample-wise differential detection of Differential Phase Shift Keying (DPSK) IR-UWB symbols, as well as a newly introduced sample-wise differential detection of IR-UWB PPM symbols. A common problem with these low-complexity IR-UWB detection schemes is poor performance when the dimension of the symbol in detection is high, which is usually the case at low data rates and is especially pronounced in interference environments. Chirp pulse compression mitigates this problem by reducing the dimension of the symbol in detection by using a very small fading factor, which also lowers the computational complexity in the case of digital implementation. In the analytic part of the paper, we develop a closed-form expression for the bandwidth and dimension of the signal after the chirp pulse compression, which was lacking before. Furthermore, a closed-form expression of the bit error probability in white noise with the above detection schemes is also given. In the numerical part of the paper, we compare the performance with and without chirp pulse compression of the above modulation/detection pairs in noise and interference environments.
International Journal of Wireless Information Networks, 2012
The paper analyses performances of the two lowest data rates of Impulse-Radio Ultra-Wideband DPSK... more The paper analyses performances of the two lowest data rates of Impulse-Radio Ultra-Wideband DPSK physical layer of recently published IEEE 802.15.6 Body Area Networks standard. Two receiver architectures suitable for the reception of symbols with signal structure described in specification of this physical layer, namely duty-cycled sampling receiver and chirp receiver, are introduced. Then, performance of these receiver architectures are analyzed through probabilities of error in different phases of packet reception. Analysis has been performed in the presence of different types of interference; namely Frequency Modulated Ultra-Wideband, WiMax and other co-located IEEE 802.15.6 Impulse-Radio Ultra-Wideband devices.
IEEE Journal of Selected Topics in Signal Processing, 2000
In this paper, a method for the design of nonlinear phase, full-band, ultra-wideband (UWB) pulses... more In this paper, a method for the design of nonlinear phase, full-band, ultra-wideband (UWB) pulses that satisfy the Federal Communications Commission's effective isotropic radiation power spectrum mask, or more generally, any other given mask, is introduced. The method uses convex programming in each step of the iterative procedure that updates the phase distribution of the goal function. Thanks to its mathematical structure, this method can be easily modified in order to be applied, in sequential fashion, to several different orthogonal UWB pulse-design problems, addressed later in the paper. The first among them is a problem considered in literature-design of multiple pulses, orthogonal when radiated. When employed for solving this problem, the method proposed here produces a considerably larger number of orthogonal pulses with high energy compared to the methods introduced before. As a novelty, the problem of designing pulses which are orthogonal in reception is considered. Then, a modification of our method is presented that can be used to solve this problem. We also introduce statistical criteria of robustness of pulses' orthogonality in reception, to the variation of the pulses' shape caused by the channel transfer function. After that, a modification of the proposed method is presented that is capable of producing a set of pulses with predefined maximum value of this criteria. Furthermore, it is shown that the method proposed can be used to efficiently design orthogonal pulses using a suboptimal value of the sample rate. All the concepts introduced are illustrated by design examples.
iv) zyxwvutsrqponm t3 zyxwvutsrqp S t zyxwvutsrqpo < t4: There is no current flow from any AC or ... more iv) zyxwvutsrqponm t3 zyxwvutsrqp S t zyxwvutsrqpo < t4: There is no current flow from any AC or DC source to the short-circuit load. Each output DC capacitor remains in the floating state without discharging.
—The paper describes principles of angle of arrival estimation using an anchor and a tag which ar... more —The paper describes principles of angle of arrival estimation using an anchor and a tag which are built around Decawave's DW1000 impulse radio ultra-wideband IC. Typical experimental results are provided that show the performance of Decawave's AOA demo kit based on this architecture. Keywords—Angle of arrival (AOA); Impulse Radio (IR); Ultra-Wideband (UWB); Real Time Localization System (RTLS).
The 15th International Symposium on Wireless Personal Multimedia Communications, 2012
The paper investigates chirp pulse compression as a signal dimension reduction technique in non-c... more The paper investigates chirp pulse compression as a signal dimension reduction technique in non-coherent Impulse-Radio Ultra-Wideband (IR-UWB) communications. Two common types of non-coherent IR-UWB detection are considered, energy detection of IR-UWB Pulse Position Modulated (PPM) symbols and sample-wise differential detection of Differential Phase Shift Keying (DPSK) IR-UWB symbols, as well as a newly introduced sample-wise differential detection of IR-UWB PPM symbols. A common problem with these low-complexity IR-UWB detection schemes is poor performance when the dimension of the symbol in detection is high, which is usually the case at low data rates and is especially pronounced in interference environments. Chirp pulse compression mitigates this problem by reducing the dimension of the symbol in detection by using a very small fading factor, which also lowers the computational complexity in the case of digital implementation. In the analytic part of the paper, we develop a closed-form expression for the bandwidth and dimension of the signal after the chirp pulse compression, which was lacking before. Furthermore, a closed-form expression of the bit error probability in white noise with the above detection schemes is also given. In the numerical part of the paper, we compare the performance with and without chirp pulse compression of the above modulation/detection pairs in noise and interference environments.
2014 21st Ieee International Conference on Electronics Circuits and Systems, Dec 1, 2014
The paper analyses several modulation and detection pairs for Impulse-Radio Ultra-Wideband (IR-UW... more The paper analyses several modulation and detection pairs for Impulse-Radio Ultra-Wideband (IR-UWB) Body Area Networks (BANs). First, transceiver architectures with and without chirp pulse compression are described. After that, exact expressions for the bit error probabilities in noise are given. At the end, numerical analysis is performed that includes performances in noise and performances in multiple access interference, which are especially critical for medical IR-UWB BANs.
International Journal of Ultra Wideband Communications and Systems, 2011
In this paper, several aspects of IEEE 802.15.6 DPSK IR-UWB physical layer for usage in the medic... more In this paper, several aspects of IEEE 802.15.6 DPSK IR-UWB physical layer for usage in the medical BAN are examined. First, the types of the waveforms used in the standard are given. After that we describe the packet structure. We also provide mathematical analysis of two receiver structures: the duty-cycled sampling receiver and the chirp receiver is provided with suitable digital detection methods definitions and analysis. The paper continues with developing a method of synchronisation for preamble structure described in the standard draft together with the synchronisation frame delimiter (SFD) detection method. Preamble structure itself is discussed together with offering an alternative that has better performance with less computational complexity. The performances of receivers designed according to specifications given in the paper are simulated in multi-BAN environments in order to verify robustness of such BAN devices to interference from co-located BANs, essential for the application of this physical layer in the medical BAN.
Proceedings of the 4th International Symposium on Applied Sciences in Biomedical and Communication Technologies - ISABEL '11, 2011
In this paper we present receiver design considerations and performance analysis for physical lay... more In this paper we present receiver design considerations and performance analysis for physical layer of low datarate non-coherent Ultra-Wideband Impulse Radio (UWB-IR) communication systems. Such UWB-IR systems are of particular interest in wireless medical Body Area Networks (BAN); in medical BAN amount of traffic is relatively low, however, reliability of communication under body-shadowing and interference conditions is of utmost importance. Two non-coherent modulation/detection schemes are treated analytically and numerically through noise and interference performance studies. Particular attention is given on the performance enhancement achieved by the compression of the received signal by the methods previously introduced by authors.
2012 IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC), 2012
ABSTRACT This paper investigates possible amendment of the IEEE 802.15.6 standard for Body Area N... more ABSTRACT This paper investigates possible amendment of the IEEE 802.15.6 standard for Body Area Network (BAN). Particularly, we study amending the IEEE 802.15.6 Impulse-Radio Ultra-Wideband (IR-UWB) DPSK Physical Layer (PHY) through adding data rates lower than what is currently both the lowest and mandatory data rate of this PHY. The motivation for this study is enhancing link margin and, more importantly, enhancing PHY&#39;s multi-BAN interference resistivity, crucial in medical applications of IEEE 802.15.6 BAN. Three different possibilities of adding lower data rates are considered. The first is increasing transmitted waveform duration and thus symbol rate; the second is introducing a spreading sequence and using current mandatory data rate symbols as chips; the third is introducing an inner convolution code for concatenation with the existing BCH(63,51) block code. Performances of these communication schemes are studied in multi-BAN interference.
2012 6th International Symposium on Medical Information and Communication Technology (ISMICT), 2012
The paper describes technique for differential detection of Impulse Radio Ultra-Wideband (IR-UWB)... more The paper describes technique for differential detection of Impulse Radio Ultra-Wideband (IR-UWB) Pulse Position Modulated (PPM) symbols. An expression for probability of error in noise is derived. The numerical results show the method's performance enhancement compared to the energy detection in noise and considerable performance enhancement in multiuser interference. The method is applicable to the mandatory mode of the IEEE 802.15.6 Body Area Network (BAN) IR-UWB standard.
2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2013
In this paper, we propose a novel type of Impulse Radio Ultra-Wideband (IR-UWB) beamforming struc... more In this paper, we propose a novel type of Impulse Radio Ultra-Wideband (IR-UWB) beamforming structure that we named a chirp beamformer. It represents an alternative to the well-known correlation beamforming paradigm. The chirp beamformer uses a chirp pulse as a symbol waveform. In comparison with a correlation beamformer, the chirp beamformer requires considerably lower timing resolution in cases where the IR-UWB symbol consists of a relatively long single uninterrupted waveform, as in the mandatory modes of two of the IEEE 802.15 IR-UWB standards, namely IEEE 802.15.4a-2007 and IEEE 802.15.6-2012. Furthermore, the bandwidth of the signal that the chirp beamformer generates in the baseband is considerably lower than in the case of the correlation beamformer. Hence, in the case of digital baseband signal generation, the chirp beamformer requires a considerably lower sampling rate than the correlation beamformer. A method for shaping the beam pattern of the chirp beamformer is also described. All concepts introduced are illustrated by numerical examples.
EUROCON'2001. International Conference on Trends in Communications. Technical Program, Proceedings (Cat. No.01EX439), 2001
The novel method for the suppressing the antenna array radiation pattern sidelobes while keeping ... more The novel method for the suppressing the antenna array radiation pattern sidelobes while keeping the main lobe width constant has been proposed. The method is based on the IRLS algorithm, which has found wide application in the field of radar pulse compression. The algorithm is not restricted by the array geometry and the mutual element coupling and has no limitations regarding the array excitation coefficients and array radiation pattern. In comparison with the ECF method it showed much better results in the sidelobe suppression. The algorithm implementation is simple and straightforward.
2014 IEEE Ninth International Conference on Intelligent Sensors, Sensor Networks and Information Processing (ISSNIP), 2014
The paper proposes a novel Trellis Coded Modulation (TCM) scheme for coherent Impulse-Radio Ultra... more The paper proposes a novel Trellis Coded Modulation (TCM) scheme for coherent Impulse-Radio Ultra-Wideband (IR-UWB) IEEE 802.15.4a communications that, in comparison with the current IEEE 802.15.4a IR-UWB communications scheme, is able to reduce energy per bit consumed in the receiver two times with approximately 2 dB performance loss. Furthermore, changed in the IEEE 802.15.4a coherent IR-UWB radio required to implement proposed TCM are minimal. Downside is that the proposed TCM scheme cannot be detected by non-coherent receivers. Discussion starts by looking at the current IEEE 802.15.4a IR-UWB coding and modulation scheme as a rudimentary TCM. After that, a transition is made through the TCM framework from the current IEEE 802.15.4a IR-UWB coding and modulation scheme to the proposed one.
2010 IEEE 21st International Symposium on Personal, Indoor and Mobile Radio Communications Workshops, 2010
In this work differentially coherent communication schemes for Impulse Radio Ultra-Wideband (IR-U... more In this work differentially coherent communication schemes for Impulse Radio Ultra-Wideband (IR-UWB) that transmit single uninterrupted package of energy per symbol, expected to be included in the IR-UWB IEEE 802.15.6 wireless Body Area Networks (BAN) standard are considered. Models for two receiver architectures, suitable for such communication schemes and feasible to implement in current CMOS technology -duty-cycled sampling receiver and chirp receiver are derived. After that, two differential detection techniques for employed receiver architectures -ordinary DPSK and Sample-wise DPSK (S-DPSK) are described. Theoretical analysis of probability of error for S-DPSK is also provided. Performances of the sampling and the chirp receiver architectures with DPSK and S-DPSK detection methods employed are analyzed under narrowband and Frequency-Modulated UWB (FM-UWB) types of interference.
2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications, 2007
In this paper, a method for the design of non-linear phase, full-band, UWB pulses that satisfy an... more In this paper, a method for the design of non-linear phase, full-band, UWB pulses that satisfy any given spectrum mask is described. The method uses convex programming in each step of the iterative procedure that updates the phase distribution of the goal function. Thanks to its mathematical structure, method performance is much better than the performance of similar methods found in literature. Techniques of adapting pulses waveforms for the cognitive radio applications are described; pulses waveforms are modified in order to achieve low interference to the victim systems.
Proceedings of the 8th International Conference on Body Area Networks, 2013
In this paper we present analysis of the physical layer performance of an system with the On-Off ... more In this paper we present analysis of the physical layer performance of an system with the On-Off Keying (OOK) modulation. We begin with developing a system model with describing three different receiver architectures; namely, coherent quadrature sampling receiver, envelope sampling receiver and energy detection receiver. Performances of these receiver architectures are compared in noise and Multiple Access Interference (MAI). Furthermore, the performance comparison is made in three different phases of the packet reception: preamble synchronization, Synchronization Frame Delimiter (SFD) detection and payload detection.
2011 5th International Symposium on Medical Information and Communication Technology, 2011
The paper develops a method of synchronization for synchronization header (SHR) structure describ... more The paper develops a method of synchronization for synchronization header (SHR) structure described in the draft of IEEE 802.15.6 standard for body area network (BAN) and its Impulse-Radio Ultra-Wideband (IR-UWB) physical layer (PHY) with differential phase modulation. Uniqueness of this PHY is that transmitted waveform shape is not known to the receiver at the time of synchronization and therefore classic synchronization methods based on correlation cannot be employed. Based on the developed synchronization method, synchronization performances with the different SHR structures are evaluated and solutions are suggested for the SHR structure described in the standard.
The paper investigates chirp pulse compression as a signal dimension reduction technique in non-c... more The paper investigates chirp pulse compression as a signal dimension reduction technique in non-coherent Impulse-Radio Ultra-Wideband (IR-UWB) communications. Two common types of non-coherent IR-UWB detection are considered, energy detection of IR-UWB Pulse Position Modulated (PPM) symbols and sample-wise differential detection of Differential Phase Shift Keying (DPSK) IR-UWB symbols, as well as a newly introduced sample-wise differential detection of IR-UWB PPM symbols. A common problem with these low-complexity IR-UWB detection schemes is poor performance when the dimension of the symbol in detection is high, which is usually the case at low data rates and is especially pronounced in interference environments. Chirp pulse compression mitigates this problem by reducing the dimension of the symbol in detection by using a very small fading factor, which also lowers the computational complexity in the case of digital implementation. In the analytic part of the paper, we develop a closed-form expression for the bandwidth and dimension of the signal after the chirp pulse compression, which was lacking before. Furthermore, a closed-form expression of the bit error probability in white noise with the above detection schemes is also given. In the numerical part of the paper, we compare the performance with and without chirp pulse compression of the above modulation/detection pairs in noise and interference environments.
International Journal of Wireless Information Networks, 2012
The paper analyses performances of the two lowest data rates of Impulse-Radio Ultra-Wideband DPSK... more The paper analyses performances of the two lowest data rates of Impulse-Radio Ultra-Wideband DPSK physical layer of recently published IEEE 802.15.6 Body Area Networks standard. Two receiver architectures suitable for the reception of symbols with signal structure described in specification of this physical layer, namely duty-cycled sampling receiver and chirp receiver, are introduced. Then, performance of these receiver architectures are analyzed through probabilities of error in different phases of packet reception. Analysis has been performed in the presence of different types of interference; namely Frequency Modulated Ultra-Wideband, WiMax and other co-located IEEE 802.15.6 Impulse-Radio Ultra-Wideband devices.
IEEE Journal of Selected Topics in Signal Processing, 2000
In this paper, a method for the design of nonlinear phase, full-band, ultra-wideband (UWB) pulses... more In this paper, a method for the design of nonlinear phase, full-band, ultra-wideband (UWB) pulses that satisfy the Federal Communications Commission's effective isotropic radiation power spectrum mask, or more generally, any other given mask, is introduced. The method uses convex programming in each step of the iterative procedure that updates the phase distribution of the goal function. Thanks to its mathematical structure, this method can be easily modified in order to be applied, in sequential fashion, to several different orthogonal UWB pulse-design problems, addressed later in the paper. The first among them is a problem considered in literature-design of multiple pulses, orthogonal when radiated. When employed for solving this problem, the method proposed here produces a considerably larger number of orthogonal pulses with high energy compared to the methods introduced before. As a novelty, the problem of designing pulses which are orthogonal in reception is considered. Then, a modification of our method is presented that can be used to solve this problem. We also introduce statistical criteria of robustness of pulses' orthogonality in reception, to the variation of the pulses' shape caused by the channel transfer function. After that, a modification of the proposed method is presented that is capable of producing a set of pulses with predefined maximum value of this criteria. Furthermore, it is shown that the method proposed can be used to efficiently design orthogonal pulses using a suboptimal value of the sample rate. All the concepts introduced are illustrated by design examples.
iv) zyxwvutsrqponm t3 zyxwvutsrqp S t zyxwvutsrqpo < t4: There is no current flow from any AC or ... more iv) zyxwvutsrqponm t3 zyxwvutsrqp S t zyxwvutsrqpo < t4: There is no current flow from any AC or DC source to the short-circuit load. Each output DC capacitor remains in the floating state without discharging.
Uploads
Papers by Igor Dotlic