Power control for fading cooperative multiple access channels

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Tarih

2007-08

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Yayıncı

IEEE

Erişim Hakkı

info:eu-repo/semantics/closedAccess

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Özet

For a fading Gaussian multiple access channel with user cooperation, we obtain the power allocation policies that maximize the average rates achievable by block Markov superposition coding, subject to average power constraints. The optimal policies result in a coding scheme that is simpler than the one for a general multiple access channel with generalized feedback. This simpler coding scheme also leads to the possibility of formulating an otherwise non-concave optimization problem as a concave one. Using the perfect channel state information available at the transmitters to adapt the powers, we demonstrate gains over the achievable rates for existing cooperative systems.

Açıklama

Manuscript received November 11, 2005; revised July 7, 2006 and April 24, 2007; accepted April 28, 2007. The editor coordinating the review of this paper and approving it for publication was A. Yener. This work was supported by NSF Grants ANI 02-05330, CCR 03-11311 and CCF 04-47613, ARL/CTA Grant DAAD 19-01-2-0011, and the Scientific & Technological Research Council of Turkey Grant 106E018; and was presented in part at the IEEE International Conference on Wireless Networks, Communications, and Mobile Computing, Maui, HI, June 2005.

Anahtar Kelimeler

Cooperative diversity, Fading, Multiple access channel, Power control, User cooperation, Information, Feedback, Allocation, Diversity, Capacity, Encoders, Fading channels, Markov processes, Multiple access interference, Optimization

Kaynak

IEEE Transactions on Wireless Communications

WoS Q Değeri

Q1

Scopus Q Değeri

Q1

Cilt

6

Sayı

8

Künye

Kaya, O. & Ulukuş, Ş. (2007). Power control for fading cooperative multiple access channels. IEEE Transactions on Wireless Communications, 6(8), 2915-2923. doi:10.1109/TWC.2007.05858