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IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.最新文献

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A distributed MMSE relay strategy for wireless sensor networks 无线传感器网络的分布式MMSE中继策略
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506249
N. Khajehnouri, A.H. Sayed
{"title":"A distributed MMSE relay strategy for wireless sensor networks","authors":"N. Khajehnouri, A.H. Sayed","doi":"10.1109/SPAWC.2005.1506249","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506249","url":null,"abstract":"In this paper we propose a multi-sensor relay strategy that achieves path-loss saving and improved power efficiency. In the proposed distributed scheme, the relay sensors do not need to share information about the received signals. An mean-square error design is pursued and the performance is shown to improve as the number of relay sensors (N) increases. Specifically, it is shown that the average power usage per sensor and the total average power drop as O(1/N/sup 2/) and O(1/N), respectively.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125488568","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: 20
Performance of the MIMO downlink channel with multi-mode adaptation and scheduling 多模自适应和调度的MIMO下行信道性能
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506229
A. Forenza, M. Airy, M. Kountouris, Robert W. Heath, D. Gesbert, Sanjay Shakkottai
{"title":"Performance of the MIMO downlink channel with multi-mode adaptation and scheduling","authors":"A. Forenza, M. Airy, M. Kountouris, Robert W. Heath, D. Gesbert, Sanjay Shakkottai","doi":"10.1109/SPAWC.2005.1506229","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506229","url":null,"abstract":"This paper presents an algorithm for switching transmission methods (whether for diversity or data rate maximization) over a multiple antenna broadcast channel. The proposed approach exploits long-term spatial selectivity of the user channels to decide between different diversity and multiplexing modes. We investigate the performance of this adaptive transmission method with different scheduling polices (both sensitive to user queue sizes and independent of user queue sizes). While the methods outlined in this paper are general, we present our results in the context of a broadcast channel with four transmit antennas at the central transmitter, and four antennas at each receiver. Our results indicate a gain of approximately 20% in average system throughput with the proposed algorithm over realistic channel models.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127200606","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: 10
Using flexible turbo-like codes for simplified water-filling 使用灵活的涡轮式代码简化注水
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506306
K. Chugg, P. Gray
{"title":"Using flexible turbo-like codes for simplified water-filling","authors":"K. Chugg, P. Gray","doi":"10.1109/SPAWC.2005.1506306","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506306","url":null,"abstract":"A method for approaching the water-filling (WF) capacity of parallel Gaussian channels is presented. This method relies on the existence of modern turbo-like codes (TLCs) with a high degree of rate flexibility. The algorithm is a constant power WF algorithm with the active sub-channels and associated modulations selected based on the performance limits of the available TLC and modulation formats. A single TLC block is used over all sub-channels with rate imposed by the modulation assignments and the total capacity limits of the channel. Simulation results demonstrate that this approach can yield performance within approximately 3-5 dB of the ideal WF capacity for Rayleigh channel gains.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131772553","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
Centralised and distributed power allocation algorithms in cooperative networks 协作网络中的集中式和分布式功率分配算法
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506042
J. Adeane, Miguel R D Rodrigues, I. Wassell
{"title":"Centralised and distributed power allocation algorithms in cooperative networks","authors":"J. Adeane, Miguel R D Rodrigues, I. Wassell","doi":"10.1109/SPAWC.2005.1506042","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506042","url":null,"abstract":"Cooperation among network nodes provides transmit diversity in cases where wireless transmitters, due to size and power limitation, cannot support multiple antennas. We consider cooperation among M nodes, where each node achieves space diversity by using other nodes' antennas as relays. Cooperation among nodes has been shown to achieve impressive bit error rate (BER) gains as compared to a non-cooperative system while maintaining the same information rate, transmit power, and bandwidth [ A. Sendonaris et al. (2003), J. N. Laneman et al. (2004), T. E. Hunter et al.]. Firstly, this paper formulates an optimum, centralised power allocation scheme appropriate for a cooperative network that employs transparent relaying. It will be shown that the proposed allocation scheme significantly outperforms the equal power allocation scheme, e.g., by up to 5 dB for a 3-user case at a bit error rate of 10/sup -3/. Secondly, this paper proposes a distributed power allocation scheme where each node independently calculates its power allocation factors, and it will be shown that it converges to the optimum allocation yielded by the centralised approach. Finally, this paper presents a distributed power allocation algorithm to optimise the BER performance of cooperative networks only with partial knowledge of the channel state information (CSI) of the non-adjacent nodes.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134330785","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: 27
Cramer Rao bounds for channel estimation with symbol a priori information 基于符号先验信息的信道估计的Cramer - Rao界
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506233
X. Wautelet, C. Herzet, L. Vandendorpe
{"title":"Cramer Rao bounds for channel estimation with symbol a priori information","authors":"X. Wautelet, C. Herzet, L. Vandendorpe","doi":"10.1109/SPAWC.2005.1506233","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506233","url":null,"abstract":"In this paper we derive the Cramer-Rao bound (CRB) for the estimation of a multiple-input multiple-output (MIMO) channel when a given a priori information about the transmitted sequence is available. This approach also enables to compute the non-data-aided (NDA) bound, i.e. the CRB when the receiver only knows the symbol constellation. We explore various scenarios, including the case of a deterministic channel and the case of a random channel. Numerical evaluations of the CRB-based bounds are presented for different channels. In particular, the influence of the symbol-constellation size is highlighted. Finally, the performance of an estimator based on the expectation-maximization algorithm is shown to be very close to the proposed bounds.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133256661","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
A simple and efficient channel estimation for MIMO OFDM code division multiplexing uplink systems 一种简单有效的MIMO OFDM码分复用上行系统信道估计方法
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505895
L. Cariou, J. Hélard
{"title":"A simple and efficient channel estimation for MIMO OFDM code division multiplexing uplink systems","authors":"L. Cariou, J. Hélard","doi":"10.1109/SPAWC.2005.1505895","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505895","url":null,"abstract":"In this paper, we propose a novel and simple uplink MIMO channel estimation technique based on spread pilots technique well suited to SS-MC-MA schemes. The combination with Alamouti code is studied and two different approaches are compared. As the interferences are mainly generated by the channel variance on the pilot sequence, we demonstrate the advantages of a chip mapping optimization. The performances evaluated over a realistic MIMO channel show the efficiency of this novel scheme which appears to be a promising channel estimation for the uplink of the future wideband wireless networks.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132881405","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: 16
Throughput enhancement by cancellation of synchronization and pilot channel for UMTS high speed downlink packet access 通过取消同步和导频信道来提高UMTS高速下行分组访问的吞吐量
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506206
E. Kaltenberger, K. Freudenthaler, S. Paul, J. Wehinger, C. Mecklenbrauker, Andreas Springer, J. Berkmann
{"title":"Throughput enhancement by cancellation of synchronization and pilot channel for UMTS high speed downlink packet access","authors":"E. Kaltenberger, K. Freudenthaler, S. Paul, J. Wehinger, C. Mecklenbrauker, Andreas Springer, J. Berkmann","doi":"10.1109/SPAWC.2005.1506206","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506206","url":null,"abstract":"In this paper, we show by simulations that the interference generated by the synchronization channel (SCH) and common pilot channel (CPICH) has considerable impact on the throughput of the high-speed physical downlink shared channel (HS-PDSCH) in UMTS. First, the simulation model for high speed downlink packet access (HSDPA) in UMTS is described. The downlink physical layer for the user data on the HS-PDSCH is modelled in detail, whereas the associated signalling is idealised as error-free. The interference from signalling and data channels on the HS-PDSCH is modelled adequately. As a general guideline for system settings in the simulations, we use the test cases specified in 3GPP TS 25.101 whenever applicable. Cancelling the SCH interference at the mobile side leads to an improvement of approx. 1 dB on an additive white Gaussian noise channel. Therefore, it is worthwhile to implement interference cancellation (IC) for the SCH and CPICH in future mobile receivers for HSDPA.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115414061","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: 10
Distributed signal processing for sensor networks 传感器网络的分布式信号处理
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1505856
M. Vetterli
{"title":"Distributed signal processing for sensor networks","authors":"M. Vetterli","doi":"10.1109/SPAWC.2005.1505856","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1505856","url":null,"abstract":"A sensor network is a spatia-temporal sampling device with a wireless communications infrastructure. In this talk, after a short overview of the Center on Mobile Information and Communication Systems (http://www.mics.org), we will address the following questions: I . The spatio-temporal structure of distributed signals, with an emphasis on the physics behind the signals, and results on sampling 2. The interaction of distributed source compression and transmission, with a particular focus on joint source-channel coding 3. Some applications in environmental monitoring, like for example tomographic measurements This is joint work with T.Ajdler, B.Beferull-Lozano,, H.Dubois-Ferriere, R.Konsbruck (EPFL), RCristescu (Caltech), P.L.Dragotti (Imperial) and M.Gastpar (UC Berkeley). The work is sponsored by the Center on Mobile Information and Communication Systems (www.mics.org), funded by the Swiss National Science Foundation.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115695927","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: 29
A time-varying MIMO channel model: theory and measurements 时变MIMO信道模型:理论与测量
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506044
S. Wang, A. Abdi, J. Salo, H. El-Sallabi, P. Vainikainen
{"title":"A time-varying MIMO channel model: theory and measurements","authors":"S. Wang, A. Abdi, J. Salo, H. El-Sallabi, P. Vainikainen","doi":"10.1109/SPAWC.2005.1506044","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506044","url":null,"abstract":"A new narrowband MIMO channel model for microcells is introduced, and different aspects of the model, such as spatial, spatio-temporal, level crossing rate, and average fade duration are compared with the measured data, to verify the proposed model. The results exhibit the utility of the new parametric model. The proposed model serves as a useful tool for design and simulation of MIMO systems in microcellular environment.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122176888","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
Reduced latency turbo decoding 降低延迟turbo解码
IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005. Pub Date : 2005-06-05 DOI: 10.1109/SPAWC.2005.1506276
Yige Wang, Juntan Zhang, M. Fossorier, J. Yedidia
{"title":"Reduced latency turbo decoding","authors":"Yige Wang, Juntan Zhang, M. Fossorier, J. Yedidia","doi":"10.1109/SPAWC.2005.1506276","DOIUrl":"https://doi.org/10.1109/SPAWC.2005.1506276","url":null,"abstract":"Reduced latency versions of iterative decoding of turbo codes are analyzed in this paper. The proposed schemes converge faster than the standard and plain shuffled approaches. EXIT chart is used to analyze the performance of the proposed algorithms. Both theoretical analysis and simulation results show that the new schedules offer better performance/complexity trade-offs.","PeriodicalId":273666,"journal":{"name":"IEEE 6th Workshop on Signal Processing Advances in Wireless Communications, 2005.","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114467626","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: 11
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