2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), 2012
ABSTRACT We consider distributed total transmit power minimization in single-sink data gathering ... more ABSTRACT We consider distributed total transmit power minimization in single-sink data gathering wireless sensor network via joint optimization of routing and resource allocation with given source rates. There exists numerous decentralized cross-layer optimization algorithms derived via dual decomposition over the physical and network layer. We propose a consensus based distributed optimization algorithm which applies alternating direction method of multipliers to efficiently solve the problem with low message passing. Numerical examples illustrate how significantly faster the proposed algorithm converges as compared to the state of the art method based on dual decomposition.
2013 IEEE Global Conference on Signal and Information Processing, 2013
ABSTRACT We consider the sum power minimization problem with user specific rate constraint in the... more ABSTRACT We consider the sum power minimization problem with user specific rate constraint in the context of uplink LTE-A type system with carrier aggregation (CA), more precisely, inter-band CA. The increased bandwidth in LTE-A system allows orthogonal allocation of subcarriers among users. If time sharing or non-linear receivers are assumed, the problem becomes convex and can be optimally solved by standard solvers. We adopt a Lagrangian dual decomposition method in the conventional single band LTE type system to solve the subcarrier allocation problem. We further propose a subcarrier allocation and power control algorithm for the wideband CA. Because of the non-convex nature of the orthogonal subcarrier allocation, the optimal solution is not guaranteed. However, it is shown in the simulation results, that when there are sufficient available bandwidth, the performance gap between the optimal solution is small. The simulation results show with the proposed fast algorithms, the CA performs better than the conventional single band system. The gains become larger as the frequency selectivity increases.
2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications, 2006
This paper presents a subspace-based algorithm for the simultaneous estimation of angle of arriva... more This paper presents a subspace-based algorithm for the simultaneous estimation of angle of arrivals (AOAs) and angle of departures (AODs) from an estimated spatial signature at the receive antenna array. The algorithm exploits a 2-D unitary ESPRIT-like technique to separate and estimate the phase shifts due to the AOAs and AODs with automatic pairing of the two parameter sets. The Cramer-Rao lower bound (CRLB) on the AOAs and AODs estimates is provided. The performance of the algorithm is illustrated based on the computer simulation. It shows that the proposed algorithm is an efficient estimator which is able to achieve the CRLB
ABSTRACT This letter introduces diagnostic impulse-detection methods in general, and, based on th... more ABSTRACT This letter introduces diagnostic impulse-detection methods in general, and, based on those, presents three iterative impulse detectors for communication receivers with an antenna array. These detectors are implemented either in a backward or forward search mode. The forward methods are shown to perform better. They can detect all the impulses, even though 90% of all the samples are corrupted.
It is foreseen that a single (wideband) air interface mode is not sufficient for achieving the hi... more It is foreseen that a single (wideband) air interface mode is not sufficient for achieving the high spectral efficiency targets set for next generation wireless system. A dual-bandwidth approach is adapted to simultaneously provide wide coverage and high capacity in a large range of different operating envi-ronments. In this paper, hybrid diversity-multiplexing scheme, where Space-time Turbo Coded Modulation (STTuCM) and layered space-time architectures are combined, is used as the air interface for the wide area communication to provide high spectral efficiency and robustness against spatial fading corre-lation. A system level performance study with different radio resource allocation functionalities applied to the proposed low bandwidth STTuCM orthogonal frequency division multiplexing air interface concept is conducted. The simulation results from the developed system level simulator indicate that the dynamic channel allocation (DCA) results in far better performance than the ran...
The least squares (LS) channel estimation algorithm for a multiple-input multiple-output (MIMO) s... more The least squares (LS) channel estimation algorithm for a multiple-input multiple-output (MIMO) system with orthog-onal frequency division multiplexing (OFDM) is considered in this paper. Two architectures for the algorithm are pre-sented and the architectures are implemented using fixed point arithmetic. The minimum word lengths for the imple-mentations are determined through computer simulations for 2 × 2 and 4 × 4 MIMO systems with quadrature phase-shift keying (QPSK) modulation. Field-programmable gate array (FPGA) synthesis simulation is done for the architec-tures using the obtained word lengths which provides com-plexity and latency results. The algorithm implementations are shown to consume reasonably small amount of hardware resources.
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), 1998
The performance of the multi-code (MC) access system with one processing gain and the multiple pr... more The performance of the multi-code (MC) access system with one processing gain and the multiple processing gain (MPG) access for asynchronous multirate code-division multiple-access (CDMA) systems are considered. The bit error rates (BER) of the decorrelating, parallel interference canceler (PIC) and groupwise serial interference canceler (GSIC) with either the PIC or decorrelator within the group are compared. The results show
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), 1998
The decorrelating multiuser detector for asynchronous multirate multiuser code-division multiple-... more The decorrelating multiuser detector for asynchronous multirate multiuser code-division multiple-access (CDMA) systems is analyzed. A multirate CDMA system model able to fit several system concepts in the same framework is presented. The performance of the multi-code (MC) system with one processing gain and a multiple processing gain (MPG) system is compared. Lower bounds for the expected value of the asymptotic multiuser efficiency of a synchronous multirate CDMA system with three effective users are derived for a system with one and two processing gains. The numerical results show that the performance of the decorrelating detector for MC and MPG systems do not differ significantly
Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications, 1995
For synchronous CDMA systems the decorrelating multiuser detector is the inverse of the correlati... more For synchronous CDMA systems the decorrelating multiuser detector is the inverse of the correlation matrix of the signature waveforms. The noise-whitening multiuser detector is the inverse of the Cholesky factor of the correlation matrix. If the number of users or the signature signals changes, the detectors must be recomputed. The paper introduces order-recursive algorithms for detector update. The algorithms compute
The inclusion of groupwise interference cancellation techniques into WCDMA uplink receivers is st... more The inclusion of groupwise interference cancellation techniques into WCDMA uplink receivers is studied in this paper. Emerging third generation WCDMA signal structures for multirate transmission are utilized along with necessary uplink techniques, namely antenna diversity reception, transmitter power control and signal-to-interference ratio (SIR) estimation. A groupwise serial interference cancellation (GSIC) technique suitable for WCDMA systems using long spreading sequences is
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525), 2000
... PIC Receiver Kimmo Kansanen Jianke Fan Markku Juntti Matti Latva-aho University of Oulu, Cent... more ... PIC Receiver Kimmo Kansanen Jianke Fan Markku Juntti Matti Latva-aho University of Oulu, Centre for Wireless Communications PO Box 4500, FIN-90014 University of Oulu, Finland tel. f358 8 553 2833, fax. f358 8 553 2845 { kimmo . kansanen, fan. jianke,markku. junt ti,mat t i ...
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754), 2004
We evaluate the performance of single- and multi-antenna multi-carrier code division multiple acc... more We evaluate the performance of single- and multi-antenna multi-carrier code division multiple access (MC-CDMA) downlink (base station to mobile terminal) systems in multi-cell environments. We first propose a minimum mean square error (MMSE) filter for a single input single output (SISO) MC-CDMA downlink system. Then, we apply it to a SIMO (single input multiple output) system with a conventional turbo
2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems and Computers (ASILOMAR), 2012
ABSTRACT We consider distributed total transmit power minimization in single-sink data gathering ... more ABSTRACT We consider distributed total transmit power minimization in single-sink data gathering wireless sensor network via joint optimization of routing and resource allocation with given source rates. There exists numerous decentralized cross-layer optimization algorithms derived via dual decomposition over the physical and network layer. We propose a consensus based distributed optimization algorithm which applies alternating direction method of multipliers to efficiently solve the problem with low message passing. Numerical examples illustrate how significantly faster the proposed algorithm converges as compared to the state of the art method based on dual decomposition.
2013 IEEE Global Conference on Signal and Information Processing, 2013
ABSTRACT We consider the sum power minimization problem with user specific rate constraint in the... more ABSTRACT We consider the sum power minimization problem with user specific rate constraint in the context of uplink LTE-A type system with carrier aggregation (CA), more precisely, inter-band CA. The increased bandwidth in LTE-A system allows orthogonal allocation of subcarriers among users. If time sharing or non-linear receivers are assumed, the problem becomes convex and can be optimally solved by standard solvers. We adopt a Lagrangian dual decomposition method in the conventional single band LTE type system to solve the subcarrier allocation problem. We further propose a subcarrier allocation and power control algorithm for the wideband CA. Because of the non-convex nature of the orthogonal subcarrier allocation, the optimal solution is not guaranteed. However, it is shown in the simulation results, that when there are sufficient available bandwidth, the performance gap between the optimal solution is small. The simulation results show with the proposed fast algorithms, the CA performs better than the conventional single band system. The gains become larger as the frequency selectivity increases.
2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications, 2006
This paper presents a subspace-based algorithm for the simultaneous estimation of angle of arriva... more This paper presents a subspace-based algorithm for the simultaneous estimation of angle of arrivals (AOAs) and angle of departures (AODs) from an estimated spatial signature at the receive antenna array. The algorithm exploits a 2-D unitary ESPRIT-like technique to separate and estimate the phase shifts due to the AOAs and AODs with automatic pairing of the two parameter sets. The Cramer-Rao lower bound (CRLB) on the AOAs and AODs estimates is provided. The performance of the algorithm is illustrated based on the computer simulation. It shows that the proposed algorithm is an efficient estimator which is able to achieve the CRLB
ABSTRACT This letter introduces diagnostic impulse-detection methods in general, and, based on th... more ABSTRACT This letter introduces diagnostic impulse-detection methods in general, and, based on those, presents three iterative impulse detectors for communication receivers with an antenna array. These detectors are implemented either in a backward or forward search mode. The forward methods are shown to perform better. They can detect all the impulses, even though 90% of all the samples are corrupted.
It is foreseen that a single (wideband) air interface mode is not sufficient for achieving the hi... more It is foreseen that a single (wideband) air interface mode is not sufficient for achieving the high spectral efficiency targets set for next generation wireless system. A dual-bandwidth approach is adapted to simultaneously provide wide coverage and high capacity in a large range of different operating envi-ronments. In this paper, hybrid diversity-multiplexing scheme, where Space-time Turbo Coded Modulation (STTuCM) and layered space-time architectures are combined, is used as the air interface for the wide area communication to provide high spectral efficiency and robustness against spatial fading corre-lation. A system level performance study with different radio resource allocation functionalities applied to the proposed low bandwidth STTuCM orthogonal frequency division multiplexing air interface concept is conducted. The simulation results from the developed system level simulator indicate that the dynamic channel allocation (DCA) results in far better performance than the ran...
The least squares (LS) channel estimation algorithm for a multiple-input multiple-output (MIMO) s... more The least squares (LS) channel estimation algorithm for a multiple-input multiple-output (MIMO) system with orthog-onal frequency division multiplexing (OFDM) is considered in this paper. Two architectures for the algorithm are pre-sented and the architectures are implemented using fixed point arithmetic. The minimum word lengths for the imple-mentations are determined through computer simulations for 2 × 2 and 4 × 4 MIMO systems with quadrature phase-shift keying (QPSK) modulation. Field-programmable gate array (FPGA) synthesis simulation is done for the architec-tures using the obtained word lengths which provides com-plexity and latency results. The algorithm implementations are shown to consume reasonably small amount of hardware resources.
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), 1998
The performance of the multi-code (MC) access system with one processing gain and the multiple pr... more The performance of the multi-code (MC) access system with one processing gain and the multiple processing gain (MPG) access for asynchronous multirate code-division multiple-access (CDMA) systems are considered. The bit error rates (BER) of the decorrelating, parallel interference canceler (PIC) and groupwise serial interference canceler (GSIC) with either the PIC or decorrelator within the group are compared. The results show
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151), 1998
The decorrelating multiuser detector for asynchronous multirate multiuser code-division multiple-... more The decorrelating multiuser detector for asynchronous multirate multiuser code-division multiple-access (CDMA) systems is analyzed. A multirate CDMA system model able to fit several system concepts in the same framework is presented. The performance of the multi-code (MC) system with one processing gain and a multiple processing gain (MPG) system is compared. Lower bounds for the expected value of the asymptotic multiuser efficiency of a synchronous multirate CDMA system with three effective users are derived for a system with one and two processing gains. The numerical results show that the performance of the decorrelating detector for MC and MPG systems do not differ significantly
Proceedings of 6th International Symposium on Personal, Indoor and Mobile Radio Communications, 1995
For synchronous CDMA systems the decorrelating multiuser detector is the inverse of the correlati... more For synchronous CDMA systems the decorrelating multiuser detector is the inverse of the correlation matrix of the signature waveforms. The noise-whitening multiuser detector is the inverse of the Cholesky factor of the correlation matrix. If the number of users or the signature signals changes, the detectors must be recomputed. The paper introduces order-recursive algorithms for detector update. The algorithms compute
The inclusion of groupwise interference cancellation techniques into WCDMA uplink receivers is st... more The inclusion of groupwise interference cancellation techniques into WCDMA uplink receivers is studied in this paper. Emerging third generation WCDMA signal structures for multirate transmission are utilized along with necessary uplink techniques, namely antenna diversity reception, transmitter power control and signal-to-interference ratio (SIR) estimation. A groupwise serial interference cancellation (GSIC) technique suitable for WCDMA systems using long spreading sequences is
11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525), 2000
... PIC Receiver Kimmo Kansanen Jianke Fan Markku Juntti Matti Latva-aho University of Oulu, Cent... more ... PIC Receiver Kimmo Kansanen Jianke Fan Markku Juntti Matti Latva-aho University of Oulu, Centre for Wireless Communications PO Box 4500, FIN-90014 University of Oulu, Finland tel. f358 8 553 2833, fax. f358 8 553 2845 { kimmo . kansanen, fan. jianke,markku. junt ti,mat t i ...
2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754), 2004
We evaluate the performance of single- and multi-antenna multi-carrier code division multiple acc... more We evaluate the performance of single- and multi-antenna multi-carrier code division multiple access (MC-CDMA) downlink (base station to mobile terminal) systems in multi-cell environments. We first propose a minimum mean square error (MMSE) filter for a single input single output (SISO) MC-CDMA downlink system. Then, we apply it to a SIMO (single input multiple output) system with a conventional turbo
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