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complex field network coding for multiuser cooperative communications

IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2008年第3期26卷 561-571页

作者： Wang, Tairan Giannakis, Georgios B. Univ Minnesota Dept Elect & Comp Engn Minneapolis MN 55455 USA

Multi-source relay-based cooperative communications can achieve spatial diversity gains, enhance coverage and potentially increase capacity when multiuser detection is used to effect maximum likelihood demodulation. If considered for large networks, traditional relaying entails loss in spectral efficiency that can be mitigated through network coding at the physical layer. These considerations motivate the complex field network coding (CFNC) approach introduced in this paper. Different from network coding over the Galois field, where wireless throughput is limited as the number of sources increases, CFNC always achieves throughput as high as 1/2 symbol per source per channel use. In addition to improved throughput, CFNC- based relaying achieves full diversity gain regardless of the underlying signal-to-noise-ratio (SNR) and the constellation used. Furthermore, the CFNC approach is general enough to allow for transmissions from sources to a common destination as well as simultaneous information exchanges among sources.

关键词： cooperative communications multiuser detection complex field coding network coding diversity gain link-adaptive regeneration

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Multi-source cooperation with full-diversity spectral-efficiency and controllable-complexity

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2007年第2期25卷 415-425页

作者： Ribeiro, Alejandro Wang, Renqiu Giannakis, Georgios B. Univ Minnesota Dept Elect & Comp Engn Minneapolis MN 55455 USA

A general framework is developed for multi-source cooperation (MSC) protocols to improve diversity and spectral efficiency relative to repetition based alternatives that rely on single-source cooperation. The novel protocols are flexible to balance tradeoffs among diversity, spectral efficiency and decoding-complexity. Users are grouped in clusters and follow a two-phase MSC protocol which involves time division multiple access (TDMA) to separate users within a cluster, and code division multiple access (CDMA) used to separate clusters. An attractive protocol under the general MSC framework relies on distributed complex field coding (DCFC) to enable diversity order equal to the number of users per cluster. Cluster separation based on orthonormal spreading sequences leads to spectral efficiency 1/2. When the number of clusters exceeds the amount of spreading, spectral efficiency can be enhanced without sacrificing diversity, at the expense of controllable increase in complexity. Simulations corroborate our analytical claims.

关键词： multiaccess communication diversity methods complex field coding user cooperation

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complex field coded MIMO systems: performance, rate, and trade-offs

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WIRELESS COMMUNICATIONS & MOBILE COMPUTING 2002年第7期2卷 693-717页

作者： Ma, XL Giannakis, GB Univ Minnesota Dept Elect & Comp Engn Minneapolis MN 55455 USA

The quest for reliable high-rate wireless links motivates fading-resilient and bandwidth-efficient communication systems capable of capitalizing on available forms of diversity. This tutorial focuses on linear complex field (LCF) coding-a powerful tool that complements the traditional Galois field (GF) coding, in enabling diversity transmissions over single- and multi-antenna fading channels. Performance and capacity analyses are provided, along with systematic guidelines for constructing LCF encoders, and options available to the designer for selecting LCF decoders. Emphasis is placed on high-performance and high-rate designs, and the emerging performance-rate-complexity trade-offs. Copyright (C) 2002 John Wiley Sons, Ltd.

关键词： complex field coding space-time coding diversity capacity complexity

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