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2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)最新文献

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Distortion analysis in OQAM/FBMC-based OFDMA 基于OQAM/ fbmc的OFDMA失真分析
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227050
D. Gregoratti, X. Mestre
{"title":"Distortion analysis in OQAM/FBMC-based OFDMA","authors":"D. Gregoratti, X. Mestre","doi":"10.1109/SPAWC.2015.7227050","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227050","url":null,"abstract":"The paper considers an OFDMA scheme based on OQAM/FBMC and evaluates the interaction of the different users to one another under strong frequency selectivity or timing synchronization errors between users. More specifically, due to imperfect equalization, each user contributes to a distortion component in the received signal. Such a distortion affects both its assigned subcarriers as well as others'. The distortion analytical expression shows the relationship between the prototype pulses and the number of affected out-band subcarriers. Realistic study cases show that OQAM/FBMC is a suitable solution for OFDMA schemes, since distortion can be maintained at tolerable levels.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125912369","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}
引用次数: 0
Robust censoring for linear inverse problems 线性逆问题的鲁棒滤波
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227087
Georg Kail, S. P. Chepuri, G. Leus
{"title":"Robust censoring for linear inverse problems","authors":"Georg Kail, S. P. Chepuri, G. Leus","doi":"10.1109/SPAWC.2015.7227087","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227087","url":null,"abstract":"Existing methods for smart data reduction are typically sensitive to outlier data that do not follow postulated data models. We propose robust censoring as a joint approach unifying the concepts of robust learning and data censoring. We focus on linear inverse problems and formulate robust censoring through a sparse sensing operator, which is a non-convex bilinear problem. We propose two solvers, one using alternating descent and the other using Metropolis-Hastings sampling. Although the latter is based on the concept of Bayesian sampling, we avoid confining the outliers to a specific model. Numerical results show that the proposed Metropolis-Hastings sampler outperforms state-of-the-art robust estimators.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128204810","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}
引用次数: 2
A comparison of iterative receivers for the non linear satellite channel 非线性卫星信道中迭代接收机的比较
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227092
B. Benammar, N. Thomas, C. Poulliat, M. Boucheret, M. Dervin
{"title":"A comparison of iterative receivers for the non linear satellite channel","authors":"B. Benammar, N. Thomas, C. Poulliat, M. Boucheret, M. Dervin","doi":"10.1109/SPAWC.2015.7227092","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227092","url":null,"abstract":"This paper presents a comparison of different in- stances of advanced iterative receivers for the non linear satellite channel. A comparison of the performance and complexity of each of the selected receivers is drawn. It is shown that the frequency domain implementation of the linear equalizer achieves good performance complexity trade-off. The cost to pay for the frequency domain processing is the addition of a Cyclic Prefix (CP) to ensure the blocks orthogonality. The consequence is a channel dependent spectral efficiency loss. We thus investigate on the efficiency gain related to the CP omission for frequency domain equalizers for different block sizes and show that for large block sizes, the equalizer's performance is not much sacrificed.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130421572","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}
引用次数: 2
Energy efficient precoding for MIMO cyclic prefixed single carrier communications MIMO循环前缀单载波通信的节能预编码
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7226991
Jeevan Shrestha, I. Stupia, L. Vandendorpe
{"title":"Energy efficient precoding for MIMO cyclic prefixed single carrier communications","authors":"Jeevan Shrestha, I. Stupia, L. Vandendorpe","doi":"10.1109/SPAWC.2015.7226991","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7226991","url":null,"abstract":"This paper addresses the design of energy efficient precoding/decoding strategies for multiple-input multiple-output cyclic prefixed single carrier (MIMO CP-SC) systems with frequency-domain equalization. We opt for eigenbeamforming in the frequency domain for spatial precoding and decoding. We show that eigenbeamforming leads to a simple yet effective maximization of the energy efficiency (EE) of the MIMO CP-SC link. Moreover, the associated power allocation relies on the combination of waterfilling among the spatial streams and a proper distribution of the per-stream allocated power among subcarriers. Numerical results show that, if we account for the efficiency of the high power amplifier (HPA) associated with the peak-to-average power ratio (PAPR), CP-SC can be more energy efficient than orthogonal frequency division multiplexing (OFDM) for moderate to high signal-to-noise (SNR) values.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124655209","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}
引用次数: 0
Filtered OFDM: A new waveform for future wireless systems 滤波OFDM:未来无线系统的新波形
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227001
Mohammad Javad Abdoli, Ming Jia, Jianglei Ma
{"title":"Filtered OFDM: A new waveform for future wireless systems","authors":"Mohammad Javad Abdoli, Ming Jia, Jianglei Ma","doi":"10.1109/SPAWC.2015.7227001","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227001","url":null,"abstract":"A spectrally-localized waveform is proposed based on filtered orthogonal frequency division multiplexing (f-OFDM). By allowing the filter length to exceed the cyclic prefix (CP) length of OFDM and designing the filter appropriately, the proposed f-OFDM waveform can achieve a desirable frequency localization for bandwidths as narrow as a few tens of subcarriers, while keeping the inter-symbol interference/inter-carrier interference (ISI/ICI) within an acceptable limit. Enabled by the proposed f-OFDM, an asynchronous filtered orthogonal frequency division multiple access (f-OFDMA)/filtered discrete-Fourier transform-spread OFDMA (f-DFT-S-OFDMA) scheme is introduced, which uses the spectrum shaping filter at each transmitter for side lobe leakage elimination and a bank of filters at the receiver for inter-user interference rejection. Per-user downsampling and short fast Fourier transform (FFT) are used at the receiver to ensure a reasonable complexity of implementation. The proposed scheme removes the inter-user time-synchronization overhead required in the synchronous OFDMA/DFT-S-OFDMA. The performance of the asynchronous f-OFDMA is evaluated and compared with that of the universal-filtered OFDM (UF-OFDM), proposed in [1], [2].","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132949167","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}
引用次数: 312
Stochastic amplify-and-forward schemes for multigroup multicast transmission in a distributed relay network 分布式中继网络中多组多播传输的随机放大转发方案
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227097
Sissi Xiaoxiao Wu, Qiang Li, Wing-Kin Ma, A. M. So
{"title":"Stochastic amplify-and-forward schemes for multigroup multicast transmission in a distributed relay network","authors":"Sissi Xiaoxiao Wu, Qiang Li, Wing-Kin Ma, A. M. So","doi":"10.1109/SPAWC.2015.7227097","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227097","url":null,"abstract":"In this paper, we study amplify-and-forward (AF) schemes to for multigroup multicast information delivery between long-distance users. The target scenario is a two-hop distributed one-way relay network where the transmitters, relays and receivers are all equipped with a single antenna. Assuming that channel state information (CSI) is perfectly known, our goal here is to design the AF weights at the relays so that the system rate performance can be optimized. A classic AF scheme in this context is to employ a rank-one beamformed AF (BF-AF) strategy with a max-min-fair (MMF) achievable rate objective. In this way, the semidefinite relaxation (SDR) technique is widely used to provide an (approximate) solution for the MMF problem. It is known that the achievable rate performance of the SDR-based BF-AF scheme tends to degrade seriously with the number of users served in the relay network. This motivates us to propose stochastic beamformed AF (SBF-AF) schemes to improve the achievable rate performance. The salient feature of the SBF-AF schemes is that it employs time-varying AF weights and bypass some inherent issues in the SDR-based BF-AF scheme. Our theoretical analysis and numerical results both show that the SBF-AF schemes can outperform the BF-AF scheme.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123800866","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}
引用次数: 6
Rate-balancing in massive MIMO using statistical precoding 基于统计预编码的大规模MIMO速率平衡
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227033
David Neumann, Andreas Gründinger, M. Joham, W. Utschick
{"title":"Rate-balancing in massive MIMO using statistical precoding","authors":"David Neumann, Andreas Gründinger, M. Joham, W. Utschick","doi":"10.1109/SPAWC.2015.7227033","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227033","url":null,"abstract":"In a typical massive MIMO system, the limited coherence time of the wireless channels leads to interference during the uplink training phase, since pilot sequences have to be reused between different users. This interference ultimately limits the achievable rate when basic linear beamforming is used. We show how to push this limit by exploiting the statistical properties of the channel. Specifically, we use a lower bound on the achievable rate to formulate a rate balancing problem which is independent of the instantaneous channel state information but only depends on the second order information. The rate balancing problem is then solved by methods known from classical MIMO systems leading to beamforming vectors and power allocations which significantly outperform the standard matched filter or zero-forcing approaches.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124900977","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}
引用次数: 8
Improving the Degrees of Freedom in MIMO relay networks via PHY caching 利用物理层缓存提高MIMO中继网络的自由度
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227098
Wei Han, An Liu, V. Lau
{"title":"Improving the Degrees of Freedom in MIMO relay networks via PHY caching","authors":"Wei Han, An Liu, V. Lau","doi":"10.1109/SPAWC.2015.7227098","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227098","url":null,"abstract":"In conventional relay networks, the Degrees of Freedom (DoF) is limited by the cut-set bound. In this paper, we proposed a novel physical layer (PHY) caching scheme for relay networks to achieve DoF gains over conventional relay schemes. Specifically, by properly caching a portion of the content files at the relay station (RS), the PHY topology can be opportunistically transformed from the unfavorable relay channel topology into a more favorable MIMO broadcast channel topology (cache-induced MIMO cooperation opportunity) and enjoy a large DoF gain. We first propose a novel caching scheme to significantly improve the MIMO cooperation opportunity induced by PHY caching. Then we propose both global and low complexity algorithms to maximize the DoF gain. Simulation indicates that the proposed scheme has significant gains over various baselines.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"129 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127927926","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}
引用次数: 3
Design of analog Joint Source-Channel Coding systems for Broadcast Channels with MSE balancing 基于MSE平衡的广播信道模拟联合源信道编码系统设计
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227107
Ó. Fresnedo, José P. González-Coma, L. Castedo
{"title":"Design of analog Joint Source-Channel Coding systems for Broadcast Channels with MSE balancing","authors":"Ó. Fresnedo, José P. González-Coma, L. Castedo","doi":"10.1109/SPAWC.2015.7227107","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227107","url":null,"abstract":"We consider the transmission of discrete-time continuous amplitude source information symbols over Multiple-Input Multiple-Output (MIMO) Broadcast Channels (BCs) using analog Joint Source Channel Coding (JSCC). We propose a distributed scheme that consists of single-user analog mappings concatenated with a BC access scheme specifically designed for the BC. Two different access methods are considered depending on the level of channel knowledge at transmission: Code Division Multiple Access (CDMA) and linear Minimum Mean Square Error (MMSE). The resulting analog JSCC systems are optimized to satisfy the requirements corresponding to the user MSEs and the power constraint. The idea of MSE balancing is also introduced to guarantee the feasibility of the optimization problems. Computer simulations show that CDMA provides good performance, although better results are obtained when the linear MMSE codes are employed instead of the CDMA ones.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121552500","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}
引用次数: 0
Fast variational Bayesian learning for channel estimation with prior statistical information 基于先验统计信息的快速变分贝叶斯学习信道估计
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-08-31 DOI: 10.1109/SPAWC.2015.7227082
Evripidis Karseras, Wei Dai, L. Dai, Zhaocheng Wang
{"title":"Fast variational Bayesian learning for channel estimation with prior statistical information","authors":"Evripidis Karseras, Wei Dai, L. Dai, Zhaocheng Wang","doi":"10.1109/SPAWC.2015.7227082","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227082","url":null,"abstract":"This work addresses the issue of incorporating prior statistical information about the channel into the pilot-assisted OFDM equalisation process for the purpose of increasing performance and speed. This is performed by considering certain informative prior distributions for the channel coefficients. Assuming a sparse multipath channel, the equalisation problem is formulated in a Bayesian setting and inference is performed in the well-known framework better known as Sparse Bayesian Learning (SBL). The previously proposed Fast Variational SBL (FVSBL) algorithm is capable of efficient inference in a true Bayesian setting but only in the case of uninformative prior distributions. We use a set of extensions to the FVSBL approach to mitigate these problems. These modifications stem from a refined fixed-point analysis. Empirical evidence supports the proper function of the proposed method. Results from a real-world channel estimation problem suggest that the proposed method achieves excellent performance.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132347998","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}
引用次数: 5
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