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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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On the suitability of ML decoding in analog multiple description schemes ML解码在模拟多描述方案中的适用性研究
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227111
Aitziber Sáez, Iker Alústiza, P. Crespo, Xabier Insausti
{"title":"On the suitability of ML decoding in analog multiple description schemes","authors":"Aitziber Sáez, Iker Alústiza, P. Crespo, Xabier Insausti","doi":"10.1109/SPAWC.2015.7227111","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227111","url":null,"abstract":"We consider analog multiple description joint source-channel schemes for the transmission of a Gaussian source over two independent AWGN parallel channels under a quadratic error distortion criteria. For such systems, Lines mapping was proved to be a simple and efficient mapping when MMSE decoding is used. However, MMSE decoding presents a high computational load. In order to reduce complexity of such schemes, this paper studies the suitability of replacing the MMSE decoders by the much simpler ML decoders. The scenario where the ML decoders have some additional side information (Wyner-Ziv scenario) is also analyzed. Their performances are compared with the corresponding theoretical bound and with the obtained simulation results of their MMSE counterparts.","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":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115679907","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: 1
Weighted LS multiuser channel estimation for LTE LTE加权LS多用户信道估计
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227069
Y. Zakharov, D. Zheng
{"title":"Weighted LS multiuser channel estimation for LTE","authors":"Y. Zakharov, D. Zheng","doi":"10.1109/SPAWC.2015.7227069","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227069","url":null,"abstract":"This paper addresses the channel estimation based on tentative data estimates in multicarrier systems, such as the LTE. We propose an iterative estimation approach based on solving in every iteration a specific weighted optimization problem. The weights are derived for two cases: known and partly known (or unknown) variances of the data estimation errors, assumed Gaussian; this assumption holds for the LTE uplink with the SC-FDMA modulation. We compare by simulation the proposed reweighted estimation approach with the conventional iterative estimation based on solving the unweighted optimization problem in a multiuser LTE uplink scenario. The comparison shows that the proposed weighted approach significantly outperforms the conventional unweighted estimation.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127305450","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
K-best branch and bound technique for the MINLP resource allocation in multi-user OFDM systems 多用户OFDM系统中MINLP资源分配的k -最优分支定界技术
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227020
Youssef Jaffal, Y. Nasser, Y. Corre, Y. Lostanlen
{"title":"K-best branch and bound technique for the MINLP resource allocation in multi-user OFDM systems","authors":"Youssef Jaffal, Y. Nasser, Y. Corre, Y. Lostanlen","doi":"10.1109/SPAWC.2015.7227020","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227020","url":null,"abstract":"In this paper, we propose a simplified approach for the Mixed Integer Non-linear Programming (MINLP) problem in the context of dynamic resource allocation for multiuser downlink Orthogonal Frequency Division Multiplexing (OFDM) systems. Our solution is based on the appropriate selection of the K-best branches of the branch and bound technique. The proposed algorithm significantly decreases the computational complexity of the conventional branch and bound technique, yet with a slight reduction in the average user throughput. Simulations results show that a trade-off between complexity decrease and performance reduction could be maintained with the proposed algorithm.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129930814","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
DOA estimation and array registration with joint sparse reconstruction methods 联合稀疏重建方法的DOA估计和阵列配准
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227088
Thomas Wiese, L. Weiland, W. Utschick
{"title":"DOA estimation and array registration with joint sparse reconstruction methods","authors":"Thomas Wiese, L. Weiland, W. Utschick","doi":"10.1109/SPAWC.2015.7227088","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227088","url":null,"abstract":"Two uniform linear arrays with inexactly known relative positions shall be used for coherent direction of arrival estimation. We show that in the narrowband case the estimation of the displacement parameter is well posed if the number of sources is known. Furthermore, we propose a fast registration method that estimates the unknown displacement parameter using a combination of sparse reconstruction algorithms for distributed compressed sensing and Newton's method.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128939917","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
On the benefits of edge caching for MIMO interference alignment 边缘缓存对MIMO干扰比对的好处
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227119
M. Deghel, Ejder Bastug, M. Assaad, M. Debbah
{"title":"On the benefits of edge caching for MIMO interference alignment","authors":"M. Deghel, Ejder Bastug, M. Assaad, M. Debbah","doi":"10.1109/SPAWC.2015.7227119","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227119","url":null,"abstract":"In this contribution, we jointly investigate the benefits of caching and interference alignment (IA) in multiple-input multiple-output (MIMO) interference channel under limited backhaul capacity. In particular, total average transmission rate is derived as a function of various system parameters such as backhaul link capacity, cache size, number of active transmitter-receiver pairs as well as the quantization bits for channel state information (CSI). Given the fact that base stations are equipped both with caching and IA capabilities and have knowledge of content popularity profile, we then characterize an operational regime where the caching is beneficial. Subsequently, we find the optimal number of transmitter-receiver pairs that maximizes the total average transmission rate. When the popularity profile of requested contents falls into the operational regime, it turns out that caching substantially improves the throughput as it mitigates the backhaul usage and allows IA methods to take benefit of such limited backhaul.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122358879","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: 46
Analog coding for Gaussian source and state interference estimation 高斯源模拟编码及状态干扰估计
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227108
A. Saleh, F. Alajaji, W. Chan
{"title":"Analog coding for Gaussian source and state interference estimation","authors":"A. Saleh, F. Alajaji, W. Chan","doi":"10.1109/SPAWC.2015.7227108","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227108","url":null,"abstract":"We consider zero-delay analog coding of a Gaussian source over a Gaussian channel with additive correlated Gaussian interference known to the transmitter. The receiver aims to jointly estimate the source signal and the state interference. We propose a layered parametric analog coding scheme based on linear and sawtooth mappings. We derive an upper bound on the distortion for the parametric scheme by assuming a suboptimal decoder. To optimize the system parameters, we use two suboptimal methods. The first one is partially numerical and part of the parameters are derived assuming no sawtooth mapping; the other one, however, is based on minimizing the derived upper bound. To improve the performance whenever storage and offline design complexity are not an issue, we design a nonparametric mapping through an iterative process based on joint optimization between the encoder and the decoder using the necessary conditions for optimality. Numerical results show that the nonparametric and parametric mappings outperform the linear scheme and overcome the saturation effect.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121591445","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
MIMO-based Multitaper detection over Nakagami channels for dynamic spectrum access devices 基于mimo的动态频谱接入设备Nakagami信道多锥度检测
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227058
E. G. Yousif, T. Ratnarajah, M. Sellathurai
{"title":"MIMO-based Multitaper detection over Nakagami channels for dynamic spectrum access devices","authors":"E. G. Yousif, T. Ratnarajah, M. Sellathurai","doi":"10.1109/SPAWC.2015.7227058","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227058","url":null,"abstract":"The multitaper estimator is considered as the most powerful nonparametric method for reconstructing the power spectrum of a signal. The multitaper detector has been strongly recommended to be used for spectrum sensing in cognitive radio systems. In this paper we provide a new and accurate model for the Multitaper detector assuming that both the transmitting and detecting nodes are employing single-user multiple-input-multiple-output (MIMO) structures. We present closed form mathematical expressions for the performance of the decision variable within the hypotheses testing context. We model the decision variable using the Phase-Type distribution, where we derive the exact distribution parameters for both the null and the alternate hypotheses. Furthermore, we accurately bound the average probability of detection over Nakagami fading channels. Finally, the average probability of detection is maximized to yield a predetermined probability of false alarm. The results show that the obtained analytical models are accurate. As a generic trend, it is found that adjusting the length of observed sequences has no effect on the detector performance. On the other hand, it is found that increasing the number of receiving branches provides a significant enhancement for the MIMO-Multitaper method.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133133053","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: 1
Pilot clustering in asymmetric massive MIMO networks 非对称大规模MIMO网络中的导频聚类
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227034
R. Mochaourab, Emil Björnson, M. Bengtsson
{"title":"Pilot clustering in asymmetric massive MIMO networks","authors":"R. Mochaourab, Emil Björnson, M. Bengtsson","doi":"10.1109/SPAWC.2015.7227034","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227034","url":null,"abstract":"We consider the uplink of a cellular massive MIMO network. Since the spectral efficiency of these networks is limited by pilot contamination, the pilot allocation across cells is of paramount importance. However, finding efficient pilot reuse patterns is non-trivial especially in practical asymmetric base station deployments. In this paper, we approach this problem using coalitional game theory. Each cell has its own unique pilots and can form coalitions with other cells to gain access to more pilots. We develop a low-complexity distributed algorithm and prove convergence to an individually stable coalition structure. Simulations reveal fast algorithmic convergence and substantial performance gains over one-cell coalitions and full pilot reuse.","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128713820","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: 15
A Gaussian noise model of spectral amplitudes in soliton communication systems 孤子通信系统中谱幅的高斯噪声模型
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227079
Qun Zhang, T. Chan
{"title":"A Gaussian noise model of spectral amplitudes in soliton communication systems","authors":"Qun Zhang, T. Chan","doi":"10.1109/SPAWC.2015.7227079","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227079","url":null,"abstract":"Using the nonlinear Fourier transform, one can transform a time-domain fibre channel (characterised by the nonlinear Schrödinger equation) into multiple parallel independent channels. Exploiting this property, nonlinear frequency division multiplexing (NFDM) was proposed [1]. Such an NFT-based transmission approach has prompted the study of the channel noise (on the eigenvalues and spectral amplitudes) in the (nonlinear) spectral domain. In this paper, we propose a consistent noise model for the evolution of an eigenvalue. Then, following the approach in [2], we develop a Gaussian noise model for a spectral amplitude (assuming its perturbation is largely due to the perturbation in the eigenvalue).","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"38 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122289959","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: 25
On the performance of randomly directional beamforming between line-of-sight and rich scattering channels 视距与富散射信道间随机定向波束形成性能研究
2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) Pub Date : 2015-06-01 DOI: 10.1109/SPAWC.2015.7227016
Gilwon Lee, Y. Sung, M. Kountouris
{"title":"On the performance of randomly directional beamforming between line-of-sight and rich scattering channels","authors":"Gilwon Lee, Y. Sung, M. Kountouris","doi":"10.1109/SPAWC.2015.7227016","DOIUrl":"https://doi.org/10.1109/SPAWC.2015.7227016","url":null,"abstract":"In this paper, the performance of random beamforming (RBF) which requires only partial channel state information (CSI) feedback is investigated for millimeter-wave (mmwave) multiple-input multiple-output (MIMO) downlink systems under a new channel model that captures both the independent and identically-distributed (i.i.d.) Rayleigh fading MIMO channel model and the uniform random line-of-sight (UR-LoS) channel model and bridges the two channel models. Under the proposed channel model, we answer the basic question “how many users in the cell are required for RBF to achieve linear sum rate scaling with respect to (w.r.t.) the number of transmit antennas?”","PeriodicalId":211324,"journal":{"name":"2015 IEEE 16th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126285111","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: 7
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