4 Abstract— In the modern era of communication Orthogonal Frequency Division Multiplexing (OFDM) ... more 4 Abstract— In the modern era of communication Orthogonal Frequency Division Multiplexing (OFDM) technique is the most widely used in wireless technology. With some advantage come few issues such as Peak to Average Power Ratio (PAPR) that leads High Power Amplifiers (HPA) to be worked in nonlinear region which causes inter-modulation distortion and out of band radiation. To overcome with this problem, several techniques were used. Whereas, this paper uses most efficient signal scrambling technique, Partial Transmit Sequence (PTS) and Selected Mapping (SLM) to be worked with various modulators such as Orthogonal Quadrature Phase Shift Key (OQPSK) and Quadrature Amplitude Modulator (QAM) and Binary Phase Shift Key (BPSK) . Under different modulator and different parameters like Sub-Band, Modulation factor, these techniques were analyzed and compared.
VLC uses white Light Emitting Diodes (LED), which sends data by flashing light at speeds which ar... more VLC uses white Light Emitting Diodes (LED), which sends data by flashing light at speeds which are invisible to the human eye. One of the major advantage of VLC is that one can use the infrastructure around them without making any changes to it. The ability of LED is to transfer information signals over light (which is between 430THz to 770THz of frequency and whose wavelength is between 380nm to 750nm) makes it a very good communication medium. The light we use in our daily life can not only be used for providing light but also for communication. Doing more investigations of VLC research, it was found that a lot of research is being done to make this technology available for commercial use in various fields, including Internet access and vehicle-toroad communication using traffic signal lights. From our review of the literature, it is clear that work should be done to design a new model that could be fitted to the present infrastructure for indoor applications.
OFDM is used as a very bandwidth efficient technique in modern wireless communication and is very... more OFDM is used as a very bandwidth efficient technique in modern wireless communication and is very robust against ISI. Carrier Frequency synchronization (CFO) is of utmost importance in OFDM and if frequency synchronization is lost the system performance will be decreased. Several CFO estimation techniques are there, In OFDM guard interval is used to remove ISI and Varying guard interval length shows different performance
This paper considers an orthogonal frequency division multiplexing (OFDM) system over frequency s... more This paper considers an orthogonal frequency division multiplexing (OFDM) system over frequency selective time-varying fading channels. The frequency offset between transmitter and receiver local oscillator is main drawback of OFDM systems, which causes intercarrier interference (ICI) in the subcarriers of the OFDM system. This ICI degrades the bit error rate (BER) performance of the system. In this paper an ICI self cancellation scheme, new or modify self-ICI cancellation scheme and ICI conjugate cancellation method is compared. KeywordsBER,DAB,DVB-T,ICI,FFT,IFFT,OFDM,PSK,WiMax,UWB,ICI self cancellation,Modified self cancellation,Conjugate self cancellation.
AbstractPeak to Average power ratio is the prob lem being faced in multicarrier system, for Long ... more AbstractPeak to Average power ratio is the prob lem being faced in multicarrier system, for Long term evolution(LTE) research is being done for a kind of system that is having lesser PAPR. Single carrier Frequency divis ion multiple access (SC-FDMA) and Orthogonal frequency division multiple access (OFDMA) are major part of LTE. OFDMA was well utilized for achieving high spectral efficiency in communication system. SC-FDMA is introduced recentl y and it became handy candidate for uplink multiple access scheme i n LTE system that is a project of Third Generation Partnership Project (3GPP).
Numerous static as well as dynamic optimization algorithms are presented by authors in literature... more Numerous static as well as dynamic optimization algorithms are presented by authors in literature using different attributes of cross layer design for wireless communication. This paper deliberates the QoS metrics for different scenarios for link prediction, congestion control techniques and security for enhancement of network performance. Primary objective is on link prediction heuristic for optimization of network lifetime and congestion control. Simulation observations under different scenarios show the enhancement of the network performance using optimized link stable routing is better as compared with other heuristics. Receiver initiated acknowledgement with multi-hop and multicast communication methodology, cross-layer protocol improves the transmission rate and performance of network using link correlation heuristic. Different performance parameters of ad-hoc routing protocols for different scenarios are compared. Impact of mobility, scalability and network size of ad-hoc rou...
Orthogonal Frequency Division Multiplexing technique (OFDM) is a most widely used technology in t... more Orthogonal Frequency Division Multiplexing technique (OFDM) is a most widely used technology in today's wireless communication system. This technology suffer with a shortcoming known as Peak to Average Power Ratio (PAPR), due to this, the High Power Amplifiers (HPA) are worked in nonlinear region and cause inter-modulation distortion and unwanted out of band radiation. To combat the PAPR various PAPR reduction technique are developed. In this paper the most efficient signal distortion-less technique, Partial Transmit Sequence (PTS) and Selected Mapping (SLM) are used under different modulator namely Quadrature Phase Shift Key (QPSK) and Quadrature Amplitude modulator and analyzing and comparing the techniques simultaneously and varying the different parameters like Modulation factor, Sub-band, oversampling factor has been done.
( IJSER.org ) - International Journal of Scientific & Engineering Research, May 1, 2013
4 Abstract— In the modern era of communication Orthogonal Frequency Division Multiplexing (OFDM) ... more 4 Abstract— In the modern era of communication Orthogonal Frequency Division Multiplexing (OFDM) technique is the most widely used in wireless technology. With some advantage come few issues such as Peak to Average Power Ratio (PAPR) that leads High Power Amplifiers (HPA) to be worked in nonlinear region which causes inter-modulation distortion and out of band radiation. To overcome with this problem, several techniques were used. Whereas, this paper uses most efficient signal scrambling technique, Partial Transmit Sequence (PTS) and Selected Mapping (SLM) to be worked with various modulators such as Orthogonal Quadrature Phase Shift Key (OQPSK) and Quadrature Amplitude Modulator (QAM) and Binary Phase Shift Key (BPSK) . Under different modulator and different parameters like Sub-Band, Modulation factor, these techniques were analyzed and compared.
4 Abstract— In the modern era of communication Orthogonal Frequency Division Multiplexing (OFDM) ... more 4 Abstract— In the modern era of communication Orthogonal Frequency Division Multiplexing (OFDM) technique is the most widely used in wireless technology. With some advantage come few issues such as Peak to Average Power Ratio (PAPR) that leads High Power Amplifiers (HPA) to be worked in nonlinear region which causes inter-modulation distortion and out of band radiation. To overcome with this problem, several techniques were used. Whereas, this paper uses most efficient signal scrambling technique, Partial Transmit Sequence (PTS) and Selected Mapping (SLM) to be worked with various modulators such as Orthogonal Quadrature Phase Shift Key (OQPSK) and Quadrature Amplitude Modulator (QAM) and Binary Phase Shift Key (BPSK) . Under different modulator and different parameters like Sub-Band, Modulation factor, these techniques were analyzed and compared.
VLC uses white Light Emitting Diodes (LED), which sends data by flashing light at speeds which ar... more VLC uses white Light Emitting Diodes (LED), which sends data by flashing light at speeds which are invisible to the human eye. One of the major advantage of VLC is that one can use the infrastructure around them without making any changes to it. The ability of LED is to transfer information signals over light (which is between 430THz to 770THz of frequency and whose wavelength is between 380nm to 750nm) makes it a very good communication medium. The light we use in our daily life can not only be used for providing light but also for communication. Doing more investigations of VLC research, it was found that a lot of research is being done to make this technology available for commercial use in various fields, including Internet access and vehicle-toroad communication using traffic signal lights. From our review of the literature, it is clear that work should be done to design a new model that could be fitted to the present infrastructure for indoor applications.
OFDM is used as a very bandwidth efficient technique in modern wireless communication and is very... more OFDM is used as a very bandwidth efficient technique in modern wireless communication and is very robust against ISI. Carrier Frequency synchronization (CFO) is of utmost importance in OFDM and if frequency synchronization is lost the system performance will be decreased. Several CFO estimation techniques are there, In OFDM guard interval is used to remove ISI and Varying guard interval length shows different performance
This paper considers an orthogonal frequency division multiplexing (OFDM) system over frequency s... more This paper considers an orthogonal frequency division multiplexing (OFDM) system over frequency selective time-varying fading channels. The frequency offset between transmitter and receiver local oscillator is main drawback of OFDM systems, which causes intercarrier interference (ICI) in the subcarriers of the OFDM system. This ICI degrades the bit error rate (BER) performance of the system. In this paper an ICI self cancellation scheme, new or modify self-ICI cancellation scheme and ICI conjugate cancellation method is compared. KeywordsBER,DAB,DVB-T,ICI,FFT,IFFT,OFDM,PSK,WiMax,UWB,ICI self cancellation,Modified self cancellation,Conjugate self cancellation.
AbstractPeak to Average power ratio is the prob lem being faced in multicarrier system, for Long ... more AbstractPeak to Average power ratio is the prob lem being faced in multicarrier system, for Long term evolution(LTE) research is being done for a kind of system that is having lesser PAPR. Single carrier Frequency divis ion multiple access (SC-FDMA) and Orthogonal frequency division multiple access (OFDMA) are major part of LTE. OFDMA was well utilized for achieving high spectral efficiency in communication system. SC-FDMA is introduced recentl y and it became handy candidate for uplink multiple access scheme i n LTE system that is a project of Third Generation Partnership Project (3GPP).
Numerous static as well as dynamic optimization algorithms are presented by authors in literature... more Numerous static as well as dynamic optimization algorithms are presented by authors in literature using different attributes of cross layer design for wireless communication. This paper deliberates the QoS metrics for different scenarios for link prediction, congestion control techniques and security for enhancement of network performance. Primary objective is on link prediction heuristic for optimization of network lifetime and congestion control. Simulation observations under different scenarios show the enhancement of the network performance using optimized link stable routing is better as compared with other heuristics. Receiver initiated acknowledgement with multi-hop and multicast communication methodology, cross-layer protocol improves the transmission rate and performance of network using link correlation heuristic. Different performance parameters of ad-hoc routing protocols for different scenarios are compared. Impact of mobility, scalability and network size of ad-hoc rou...
Orthogonal Frequency Division Multiplexing technique (OFDM) is a most widely used technology in t... more Orthogonal Frequency Division Multiplexing technique (OFDM) is a most widely used technology in today's wireless communication system. This technology suffer with a shortcoming known as Peak to Average Power Ratio (PAPR), due to this, the High Power Amplifiers (HPA) are worked in nonlinear region and cause inter-modulation distortion and unwanted out of band radiation. To combat the PAPR various PAPR reduction technique are developed. In this paper the most efficient signal distortion-less technique, Partial Transmit Sequence (PTS) and Selected Mapping (SLM) are used under different modulator namely Quadrature Phase Shift Key (QPSK) and Quadrature Amplitude modulator and analyzing and comparing the techniques simultaneously and varying the different parameters like Modulation factor, Sub-band, oversampling factor has been done.
( IJSER.org ) - International Journal of Scientific & Engineering Research, May 1, 2013
4 Abstract— In the modern era of communication Orthogonal Frequency Division Multiplexing (OFDM) ... more 4 Abstract— In the modern era of communication Orthogonal Frequency Division Multiplexing (OFDM) technique is the most widely used in wireless technology. With some advantage come few issues such as Peak to Average Power Ratio (PAPR) that leads High Power Amplifiers (HPA) to be worked in nonlinear region which causes inter-modulation distortion and out of band radiation. To overcome with this problem, several techniques were used. Whereas, this paper uses most efficient signal scrambling technique, Partial Transmit Sequence (PTS) and Selected Mapping (SLM) to be worked with various modulators such as Orthogonal Quadrature Phase Shift Key (OQPSK) and Quadrature Amplitude Modulator (QAM) and Binary Phase Shift Key (BPSK) . Under different modulator and different parameters like Sub-Band, Modulation factor, these techniques were analyzed and compared.
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