Power control in the cognitive cooperative multiple access channel

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Attribution-NonCommercial-NoDerivs 3.0 United States

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We extend several encoding and decoding techniques from cooperative communications framework, to a cognitive radio system consisting of a primary user (PU) and a secondary user (SU), sending their messages to a common receiver. Assuming that the transmitters and the receiver have full channel state information (CSI) collected and distributed by the common receiver, and that the SU knows the PU's codebook, the cooperation is obtained by block Markov superposition coding, and backwards decoding, which yield a causal overlay scenario. We formulate two rate optimization problems with the aim of, (i) maximizing the sum rate of the system, and (ii) maximizing the rate of the secondary user. We obtain the optimal power allocations for both cases, and the resulting rate regions. The power controlled cooperation turns out to be especially useful when maximizing the sum rate of the system, as it gives the PU significant rate rewards for allowing the cognitive transmitter to access its resources.


Anahtar Kelimeler

Backwards decoding, Block codes, Block Markov superposition coding, Channel coding, Channel state information, Codebooks, Cognitive cooperative multiple access channel, Cognitive radio, Cognitive radio system, Cognitive transmitter, Communication channels (information theory), Cooperative communication, Cooperative communications, Cooperative multiple access, Decoding, Decoding techniques, Encoding, Encoding and decoding, Encoding techniques, Fading, Information science, Interference, Markov processes, Multi-access systems, Noise, Optimal power allocation, Optimization, Optimization problems, Power control, Power controlled, Power controlled cooperation, Primary user, Radio receivers, Radio transmitters, Receiver, Relays, Secondary user, Sum-rate, Super-position coding, Telecommunication control, Transmitters


46th Annual Conference on Information Sciences and Systems

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Kaya, O. & İşleyen, M. (2012). Power control in the cognitive cooperative multiple access channel. Paper presented at the 46th Annual Conference on Information Sciences and Systems, 1-5. doi:10.1109/CISS.2012.6310802