Distributed Reception with Hard Decision Exchanges
| Autor: | Patrick Bidigare, Min Ni, Matthew Rebholz, D. Richard Brown, Upamanyu Madhow |
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| Rok vydání: | 2014 |
| Předmět: |
Beamforming
Ideal (set theory) Computer science business.industry Applied Mathematics Reliability (computer networking) Real-time computing Transmitter Throughput Data_CODINGANDINFORMATIONTHEORY Computer Science Applications Signal-to-noise ratio Fading Electrical and Electronic Engineering business Computer Science::Information Theory Communication channel Phase-shift keying Computer network |
| Zdroj: | IEEE Transactions on Wireless Communications. 13:3406-3418 |
| ISSN: | 1536-1276 |
| DOI: | 10.1109/twc.2014.051314.131763 |
| Popis: | This paper considers the problem of jointly processing messages received over a forward link from a single distant transmitter to a cooperative receive cluster connected by a local area network with finite available throughput. For N cooperating receivers, ideal distributed receive beamforming with direct exchange of unquantized observations leads to an N-fold gain in signal-to-noise ratio (SNR) for equal-gain additive white Gaussian noise channels, with significant additional gains over fading channels due to diversity. It is shown in this paper that a significant portion of these gains can be obtained simply by exchanging hard decisions among some or all of the nodes in the receive cluster. Mutual information computations and simulations of LDPC-coded systems show that optimal combining of hard decisions tends to perform within 0.5-2 dB of ideal receive beamforming. For the low per-node SNR regime of interest with large receive clusters, asymptotic analysis of a suboptimal combining technique termed "pseudo-beamforming" shows that distributed reception with hard decision exchanges performs within 1-2 dB of ideal receive beamforming. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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