Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941910
Souhaila Fki, Malek Messai, A. Aïssa-El-Bey, T. Chonavel
In this paper, we address M-QAM blind equalization based on information theoretic criteria. We propose two new cost functions that force the probability density functions (pdf) at the equalizer output to match the known constellation pdf. They involve kernel pdf approximation. The kernel bandwidth of a Parzen estimator is updated during iterations to improve the convergence speed and to decrease the residual error of the algorithms. Unlike related existing techniques, the new algorithms measure the distance error between observed and assumed pdfs for the real and imaginary parts of the equalizer output separately. We show performance and complexity gain against the CMA, the most popular blind equalization technique, and classical pdf fitting approaches.
{"title":"New criteria for blind equalization based on PDF fitting","authors":"Souhaila Fki, Malek Messai, A. Aïssa-El-Bey, T. Chonavel","doi":"10.1109/SPAWC.2014.6941910","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941910","url":null,"abstract":"In this paper, we address M-QAM blind equalization based on information theoretic criteria. We propose two new cost functions that force the probability density functions (pdf) at the equalizer output to match the known constellation pdf. They involve kernel pdf approximation. The kernel bandwidth of a Parzen estimator is updated during iterations to improve the convergence speed and to decrease the residual error of the algorithms. Unlike related existing techniques, the new algorithms measure the distance error between observed and assumed pdfs for the real and imaginary parts of the equalizer output separately. We show performance and complexity gain against the CMA, the most popular blind equalization technique, and classical pdf fitting approaches.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"8 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117320057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941413
Imen Sahnoun, I. Kammoun, M. Siala
In this paper, a cognitive radio scenario is proposed, where secondary users are allowed to communicate concurrently with primary users provided that they do not create harmful interference to the licensed users. Here, we aim to improve the unlicensed system performance under power and interfernce constraints. For this aim, we propose to use a cooperative relay to assist the secondary transmission. Moreover, an adaptive modulation is used in order to compensate the throughput loss due to the relaying. The main contribution of this work is to consider a new energy allocation scheme for source and relay nodes to maximize the instantaneous received signal-to-noise ratio under the system constraints. A variety of simulation results reveal that our proposed energy allocation method combined with adaptive modulation offers better performance compared with the classical cooperation scheme where energy resources are equally distributed over all nodes.
{"title":"Energy allocation optimization for cooperative cognitive network","authors":"Imen Sahnoun, I. Kammoun, M. Siala","doi":"10.1109/SPAWC.2014.6941413","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941413","url":null,"abstract":"In this paper, a cognitive radio scenario is proposed, where secondary users are allowed to communicate concurrently with primary users provided that they do not create harmful interference to the licensed users. Here, we aim to improve the unlicensed system performance under power and interfernce constraints. For this aim, we propose to use a cooperative relay to assist the secondary transmission. Moreover, an adaptive modulation is used in order to compensate the throughput loss due to the relaying. The main contribution of this work is to consider a new energy allocation scheme for source and relay nodes to maximize the instantaneous received signal-to-noise ratio under the system constraints. A variety of simulation results reveal that our proposed energy allocation method combined with adaptive modulation offers better performance compared with the classical cooperation scheme where energy resources are equally distributed over all nodes.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115222735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941306
Lingjia Liu, Yan Li, Jianzhong Zhang
Mobile data traffic is predicted to grow exponentially in the future. To address the challenge and consider the form factor limitation at the base station, 3D millimeter wave massive MIMO has been introduced as an enabling technology for 5G systems. In 3D millimeter wave massive MIMO systems, due to the large number of antennas and limited number of clusters, a base station will mainly rely on the uplink sounding signals instead of the feedback to figure out the channel knowledge to perform 3D MIMO operation. Accordingly, multi-dimensional channel estimation becomes critical for such systems to realize the predicted rate gains. In this paper, the performance of direction of arrival (DoA) estimation at the base station using ESPRIT method is characterized. The DoA estimation is further related to the underlying 3D MIMO achievable rate and the optimal transmission strategy is characterized. Finally, the impact of channel estimation error on the underlying achievable rate is analyzed. Our results suggest that DoA estimation is crucial for the transmit beam-forming of 3D millimeter wave massive MIMO systems. Furthermore, the optimal transmission strategy depends heavily on the performance of the underlying DoA estimation.
{"title":"DoA estimation and achievable rate analysis for 3D millimeter wave massive MIMO systems","authors":"Lingjia Liu, Yan Li, Jianzhong Zhang","doi":"10.1109/SPAWC.2014.6941306","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941306","url":null,"abstract":"Mobile data traffic is predicted to grow exponentially in the future. To address the challenge and consider the form factor limitation at the base station, 3D millimeter wave massive MIMO has been introduced as an enabling technology for 5G systems. In 3D millimeter wave massive MIMO systems, due to the large number of antennas and limited number of clusters, a base station will mainly rely on the uplink sounding signals instead of the feedback to figure out the channel knowledge to perform 3D MIMO operation. Accordingly, multi-dimensional channel estimation becomes critical for such systems to realize the predicted rate gains. In this paper, the performance of direction of arrival (DoA) estimation at the base station using ESPRIT method is characterized. The DoA estimation is further related to the underlying 3D MIMO achievable rate and the optimal transmission strategy is characterized. Finally, the impact of channel estimation error on the underlying achievable rate is analyzed. Our results suggest that DoA estimation is crucial for the transmit beam-forming of 3D millimeter wave massive MIMO systems. Furthermore, the optimal transmission strategy depends heavily on the performance of the underlying DoA estimation.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"22Suppl 3 Suppl 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129189597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941328
Lifeng Wang, M. Elkashlan, T. Duong, R. Heath
This paper proposes millimeter wave (mmWave) mobile broadband for achieving secure communication in downlink cellular network. Analog beamforming with phase shifters is adopted for the mmWave transmission. The secrecy throughput is analyzed based on two different transmission modes, namely delay-tolerant transmission and delay-limited transmission. The impact of large antenna arrays at the mmWave frequencies on the secrecy throughput is examined. Numerical results corroborate our analysis and show that mmWave systems can enable significant secrecy improvement. Moreover, it is indicated that with large antenna arrays, multi-gigabit per second secure link at the mmWave frequencies can be reached in the delay-tolerant transmission mode and the adverse effect of secrecy outage vanishes in the delay-limited transmission mode.
{"title":"Secure communication in cellular networks: The benefits of millimeter wave mobile broadband","authors":"Lifeng Wang, M. Elkashlan, T. Duong, R. Heath","doi":"10.1109/SPAWC.2014.6941328","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941328","url":null,"abstract":"This paper proposes millimeter wave (mmWave) mobile broadband for achieving secure communication in downlink cellular network. Analog beamforming with phase shifters is adopted for the mmWave transmission. The secrecy throughput is analyzed based on two different transmission modes, namely delay-tolerant transmission and delay-limited transmission. The impact of large antenna arrays at the mmWave frequencies on the secrecy throughput is examined. Numerical results corroborate our analysis and show that mmWave systems can enable significant secrecy improvement. Moreover, it is indicated that with large antenna arrays, multi-gigabit per second secure link at the mmWave frequencies can be reached in the delay-tolerant transmission mode and the adverse effect of secrecy outage vanishes in the delay-limited transmission mode.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133184503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941786
A. Cirik, Rui Wang, Y. Rong, Y. Hua
We consider a multiple antenna full-duplex (FD) bi-directional (point-to-point) communication system with a limited analog domain self-interference cancellation capability. The effect of the residual self-interference resulting from independent and identically distributed (i.i.d.) channel estimation errors and limited dynamic ranges of the transmitters and receivers is studied in the digital domain. We design transceiver matrices based on the minimization of sum mean-squared error (MSE) and the maximum per-node MSE optimization problems subject to individual power constraints at each node through an iterative alternating algorithm, which is proven to converge to at least a local optimal solution.
{"title":"MSE based transceiver designs for bi-directional full-duplex MIMO systems","authors":"A. Cirik, Rui Wang, Y. Rong, Y. Hua","doi":"10.1109/SPAWC.2014.6941786","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941786","url":null,"abstract":"We consider a multiple antenna full-duplex (FD) bi-directional (point-to-point) communication system with a limited analog domain self-interference cancellation capability. The effect of the residual self-interference resulting from independent and identically distributed (i.i.d.) channel estimation errors and limited dynamic ranges of the transmitters and receivers is studied in the digital domain. We design transceiver matrices based on the minimization of sum mean-squared error (MSE) and the maximum per-node MSE optimization problems subject to individual power constraints at each node through an iterative alternating algorithm, which is proven to converge to at least a local optimal solution.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114838052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941314
A. Hassanien, S. Vorobyov, Yeo-Sun Yoon, Joon-Young Park
We consider the problem of two-dimensional (2D) transmit beamforming design for phased-MIMO Radar with a limited number of transmit power amplifiers. Subarray partitioning is used in MIMO radar where individual subarrays operate in a phased-array mode leading to a reduction in the number of power amplifiers required. However, the use of subarray partitioning results in poor transmit beampattern characteristics due to the reduced physical aperture of the subarrays as compared to the aperture of the full transmit array. To address this problem, we introduce a new method for achieving a desired transmit beampattern while applying the concept of phased-MIMO radar. Our design consists of two cascaded stages where the first stage involves mapping a set of finite number of orthogonal waveforms into another set of cross-correlated waveforms using a linear mixing operator. The second stage involves partitioning the transmit array into a finite number of transmit subarrays where each subarray is used to radiate one of the cross-correlated waveforms in phased-array mode. The mixing matrix used in the first stage is appropriately designed to ensure that the overall transmit beampattern, i.e., the summation of all beampatterns of the individual subarrays, is as close as possible to a desired transmit beampattern. The number of power amplifiers required is finite and equals to the number of subarrays. One of the advantages of the new method is that it can achieve coherent transmit gain that is comparable to the coherent transmit gain of a phased-array radar while implementing the concept of MIMO radar. Simulation examples are used to validate the proposed method capabilities.
{"title":"Two-stage based design for phased-MIMO radar with improved coherent transmit processing gain","authors":"A. Hassanien, S. Vorobyov, Yeo-Sun Yoon, Joon-Young Park","doi":"10.1109/SPAWC.2014.6941314","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941314","url":null,"abstract":"We consider the problem of two-dimensional (2D) transmit beamforming design for phased-MIMO Radar with a limited number of transmit power amplifiers. Subarray partitioning is used in MIMO radar where individual subarrays operate in a phased-array mode leading to a reduction in the number of power amplifiers required. However, the use of subarray partitioning results in poor transmit beampattern characteristics due to the reduced physical aperture of the subarrays as compared to the aperture of the full transmit array. To address this problem, we introduce a new method for achieving a desired transmit beampattern while applying the concept of phased-MIMO radar. Our design consists of two cascaded stages where the first stage involves mapping a set of finite number of orthogonal waveforms into another set of cross-correlated waveforms using a linear mixing operator. The second stage involves partitioning the transmit array into a finite number of transmit subarrays where each subarray is used to radiate one of the cross-correlated waveforms in phased-array mode. The mixing matrix used in the first stage is appropriately designed to ensure that the overall transmit beampattern, i.e., the summation of all beampatterns of the individual subarrays, is as close as possible to a desired transmit beampattern. The number of power amplifiers required is finite and equals to the number of subarrays. One of the advantages of the new method is that it can achieve coherent transmit gain that is comparable to the coherent transmit gain of a phased-array radar while implementing the concept of MIMO radar. Simulation examples are used to validate the proposed method capabilities.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125051003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941770
Ahmed S. Mansour, R. Schaefer, H. Boche
We study secure communication in which two confidential messages are transmitted over a broadcast channel to two legitimate receivers, while keeping an eavesdropper ignorant. Each legitimate receiver is interested in decoding one confidential message, while having the other one as side information. In order to measure the secrecy of the communication, we investigate two different secrecy criteria: joint secrecy and individual secrecy. For both criteria, we provide an achievable rate region and a matching multi-letter outer bound presenting a multi-letter description for the capacity region. We further investigate the class of more capable channels and provide a single-letter converse establishing the secrecy capacity region, not only for more capable channels but less noisy and degraded channels as well. Our results indicate that the secrecy capacity for individual secrecy is higher than the one for joint secrecy, as one message can be used as a secret key for the other one.
{"title":"Joint and individual secrecy in broadcast channels with receiver side information","authors":"Ahmed S. Mansour, R. Schaefer, H. Boche","doi":"10.1109/SPAWC.2014.6941770","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941770","url":null,"abstract":"We study secure communication in which two confidential messages are transmitted over a broadcast channel to two legitimate receivers, while keeping an eavesdropper ignorant. Each legitimate receiver is interested in decoding one confidential message, while having the other one as side information. In order to measure the secrecy of the communication, we investigate two different secrecy criteria: joint secrecy and individual secrecy. For both criteria, we provide an achievable rate region and a matching multi-letter outer bound presenting a multi-letter description for the capacity region. We further investigate the class of more capable channels and provide a single-letter converse establishing the secrecy capacity region, not only for more capable channels but less noisy and degraded channels as well. Our results indicate that the secrecy capacity for individual secrecy is higher than the one for joint secrecy, as one message can be used as a secret key for the other one.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125124870","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941701
Rohit Budhiraja, B. Ramamurthi
A novel multiple-input multiple-output (MIMO) channel-diagonalization design is proposed for non-simultaneous two-way relaying (NS-TWR). Unlike conventional TWR, the base station in NS-TWR serves two different users - a transmit-only user and a receive-only user. The receive-only user experiences back-propagating interference (BI). The proposed design, which uses linear receivers, cancels the BI and diagonalizes the end-to-end MIMO channels. The diagonalized NS-TWR overcomes the restrictive antenna configurations of existing designs and yields substantial sum-rate improvement over them.
{"title":"Diagonalized two-way MIMO AF relaying for non-simultaneous traffic in cellular systems","authors":"Rohit Budhiraja, B. Ramamurthi","doi":"10.1109/SPAWC.2014.6941701","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941701","url":null,"abstract":"A novel multiple-input multiple-output (MIMO) channel-diagonalization design is proposed for non-simultaneous two-way relaying (NS-TWR). Unlike conventional TWR, the base station in NS-TWR serves two different users - a transmit-only user and a receive-only user. The receive-only user experiences back-propagating interference (BI). The proposed design, which uses linear receivers, cancels the BI and diagonalizes the end-to-end MIMO channels. The diagonalized NS-TWR overcomes the restrictive antenna configurations of existing designs and yields substantial sum-rate improvement over them.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127923908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941904
Tarig Ballal, T. Al-Naffouri
This paper proposes a low-sampling-rate scheme for ultra-wideband channel estimation. In the proposed scheme, P pulses are transmitted to produce P observations. These observations are exploited to produce channel impulse response estimates at a desired sampling rate, while the ADC operates at a rate that is P times less. To avoid loss of fidelity, the interpulse interval, given in units of sampling periods of the desired rate, is restricted to be co-prime with P. This condition is affected when clock drift is present and the transmitted pulse locations change. To handle this situation and to achieve good performance without using prior information, we derive an improved estimator based on the bounded data uncertainty (BDU) model. This estimator is shown to be related to the Bayesian linear minimum mean squared error (LMMSE) estimator. The performance of the proposed sub-sampling scheme was tested in conjunction with the new estimator. It is shown that high reduction in sampling rate can be achieved. The proposed estimator outperforms the least squares estimator in most cases; while in the high SNR regime, it also outperforms the LMMSE estimator.
{"title":"Low-sampling-rate ultra-wideband channel estimation using a bounded-data-uncertainty approach","authors":"Tarig Ballal, T. Al-Naffouri","doi":"10.1109/SPAWC.2014.6941904","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941904","url":null,"abstract":"This paper proposes a low-sampling-rate scheme for ultra-wideband channel estimation. In the proposed scheme, P pulses are transmitted to produce P observations. These observations are exploited to produce channel impulse response estimates at a desired sampling rate, while the ADC operates at a rate that is P times less. To avoid loss of fidelity, the interpulse interval, given in units of sampling periods of the desired rate, is restricted to be co-prime with P. This condition is affected when clock drift is present and the transmitted pulse locations change. To handle this situation and to achieve good performance without using prior information, we derive an improved estimator based on the bounded data uncertainty (BDU) model. This estimator is shown to be related to the Bayesian linear minimum mean squared error (LMMSE) estimator. The performance of the proposed sub-sampling scheme was tested in conjunction with the new estimator. It is shown that high reduction in sampling rate can be achieved. The proposed estimator outperforms the least squares estimator in most cases; while in the high SNR regime, it also outperforms the LMMSE estimator.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128335280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2014-06-22DOI: 10.1109/SPAWC.2014.6941310
M. Mbaye, M. Diallo, M. Mboup
We present a simple algorithm to compute the factors of a Unimodular-Upper (UU) polynomial matrix decomposition. The algorithm relies on the classical LU factorization and the inverse of the unimodular factor is also provided. Such decomposition is useful for spatial multiplexing in MIMO channel transmission system since it enables to reduce the MIMO channel matrix into independent SISO channels by a pre- and post-filtering. Unlike the classical QR-based polynomial matrix Singular Values Decomposition (QR-PMSVD), the proposed UU method allows to completely cancel the co-channel interference (CCI). Moreover, most of the resulting independent SISO channels are likely to be reduced to simple additive noise channels, i.e. with no InterSymbol Interference. However, the noise is coloured and possibly enhanced due to the non unitary property of the corresponding post filter. The complexity and sum rate capacity performance of the proposed method are studied and compared with QR-PMSVD.
{"title":"Unimodular-Upper polynomial matrix decomposition for MIMO spatial multiplexing","authors":"M. Mbaye, M. Diallo, M. Mboup","doi":"10.1109/SPAWC.2014.6941310","DOIUrl":"https://doi.org/10.1109/SPAWC.2014.6941310","url":null,"abstract":"We present a simple algorithm to compute the factors of a Unimodular-Upper (UU) polynomial matrix decomposition. The algorithm relies on the classical LU factorization and the inverse of the unimodular factor is also provided. Such decomposition is useful for spatial multiplexing in MIMO channel transmission system since it enables to reduce the MIMO channel matrix into independent SISO channels by a pre- and post-filtering. Unlike the classical QR-based polynomial matrix Singular Values Decomposition (QR-PMSVD), the proposed UU method allows to completely cancel the co-channel interference (CCI). Moreover, most of the resulting independent SISO channels are likely to be reduced to simple additive noise channels, i.e. with no InterSymbol Interference. However, the noise is coloured and possibly enhanced due to the non unitary property of the corresponding post filter. The complexity and sum rate capacity performance of the proposed method are studied and compared with QR-PMSVD.","PeriodicalId":420837,"journal":{"name":"2014 IEEE 15th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125690157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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