DocumentCode :
864756
Title :
Beamforming Algorithms for Information Relaying in Wireless Sensor Networks
Author :
Abdallah, Mohamed M. ; Papadopoulos, Haralabos C.
Author_Institution :
Dept. of Electron. & Commun. Eng., Cairo Univ., Cairo
Volume :
56
Issue :
10
fYear :
2008
Firstpage :
4772
Lastpage :
4784
Abstract :
We develop beamforming algorithms for information relaying over shared slowly nonselective fading channels in wireless sensor networks. We assume that, prior to beamforming their received data to a destination, the relays preprocess them by either data amplifying or decoding. The beamforming weights are broadcasted by the destination to the relays and are formed based on the individual relay-destination channel coefficients and an m-bit description of the quality of each source-relay channel. For both relay data-preprocessing models, we present methods for optimizing the m-bit quantizer employed at each relay for encoding its source-relay channel quality level, and for choosing the beamforming weights at the destination, so as optimize the destination uncoded bit error rates. As our simulations and analysis reveal, a coarse single-bit description of each source-relay channel coefficient at the destination may suffice, as it results in only a small increase in uncoded bit error rates with respect to the case where full knowledge of the source-relay channel coefficients are exploited at the destination.
Keywords :
fading channels; relays; wireless sensor networks; beamforming algorithms; bit error rates; cooperative communication; fading channels; information relaying; relay networks; source-relay channel; wireless sensor networks; Array signal processing; Bandwidth; Bit error rate; Decoding; Digital relays; Encoding; Fading; Optimization methods; Sensor fusion; Wireless sensor networks; Beamforming; cooperative communication; relay networks; sensor networks;
fLanguage :
English
Journal_Title :
Signal Processing, IEEE Transactions on
Publisher :
ieee
ISSN :
1053-587X
Type :
jour
DOI :
10.1109/TSP.2008.923806
Filename :
4626085
Link To Document :
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