DocumentCode :
3249377
Title :
Reliable uncoded communication in the underdetermined SIMO MAC with low-complexity decoding
Author :
Chowdhury, Mashrur ; Goldsmith, Andrea ; Weissman, Tsachy
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., Stanford, CA, USA
fYear :
2013
fDate :
2-4 Oct. 2013
Firstpage :
1075
Lastpage :
1081
Abstract :
We consider a single input multiple output (SIMO) multiple access channel with a large number of transmitters sending symbols from a constellation to the receiver of a multi-antenna base station. We investigate the fundamental limits of joint decoding of the signals from all the users using a low complexity convex relaxation of the maximum likelihood decoder (constellation search). We show that in a rich scattering environment, and in the asymptotic limit of a large number of transmitters, reliable communication is possible even without employing coding at the transmitters. This holds even when the number of receiver antennas per transmitter is arbitrarily small, with scaling behaviour arbitrarily close to what is achievable with coding. Thus, the diversity of a large system not only makes coded performance similar to that of uncoded performance, but also allows efficient decoders to realize near-optimal performance. With the proposed low-complexity decoder however, we do lose the exponential or near-exponential rates of decay of error probability of the ML decoder.
Keywords :
access protocols; error statistics; maximum likelihood decoding; radio transmitters; receiving antennas; telecommunication network reliability; constellation search; convex relaxation; error probability; low-complexity decoding; maximum likelihood decoder; multiantenna base station; multiple access channel; near-optimal performance; receiver antennas; reliable uncoded communication; scaling behaviour; scattering environment; single input multiple output; transmitters; underdetermined SIMO MAC; Error probability; Maximum likelihood decoding; Receiving antennas; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communication, Control, and Computing (Allerton), 2013 51st Annual Allerton Conference on
Conference_Location :
Monticello, IL
Print_ISBN :
978-1-4799-3409-6
Type :
conf
DOI :
10.1109/Allerton.2013.6736644
Filename :
6736644
Link To Document :
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