Optimum power control for transmitter cooperation in OFDMA based wireless networks
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Dosyalar
Tarih
2011
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
For a cooperative orthogonal frequency division multiple access (OFDMA) system with two transmitters (TXs), and full channel state information (CSI), we obtain the optimal power allocation (PA) policies which maximize the rate region achievable by a recently introduced version of block Markov superposition encoding (BMSE): inter-subchannel cooperative encoding (ISCE) [1]. We provide the optimality conditions that need to be satisfied by the powers associated with the transmitted codewords. We propose two algorithms that yield the optimal power distribution: a subgradient algorithm which achieves an arbitrary rate point on the achievable rate region boundary, and an iterative waterfilling-like algorithm which maximizes the sum rate, and converges much faster. We observe that, utilization of power control to take advantage of the diversity offered by the cooperative OFDMA system, not only leads to a remarkable improvement in achievable rates, but also may help determine how the subchannels have to be instantaneously allocated to various tasks in cooperation.
Açıklama
Anahtar Kelimeler
Resource-allocation, Fading channels, Uplink, Subcarrier, Systems, Decoding, Encoding, Fading, Iterative methods, Resource management, Transmitters, Vectors, Block Markov superposition encoding, Cooperative OFDMA system, Cooperative orthogonal frequency division multiple access system, Full channel state information, Inter-subchannel cooperative encoding, Iterative waterfilling-like algorithm, Optimal power allocation policy, Optimal power distribution, Optimum power control, Rate region boundary, Subgradient algorithm, Transmitter cooperation, Wireless networks, Markov processes, OFDM modulation, Block codes, Channel coding, Cooperative communication, Frequency division multiple access, Optimal control, Power control, Radio networks, Radio transmitters, Telecommunication control
Kaynak
2011 IEEE GLOBECOM Workshops (GC Wkshps)
WoS Q Değeri
N/A
Scopus Q Değeri
N/A
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Sayı
Künye
Bakım, İ. S. & Kaya, O. (2011). Optimum power control for transmitter cooperation in OFDMA based wireless networks. Paper presented at the 2011 IEEE GLOBECOM Workshops (GC Wkshps), 464-469. doi:10.1109/GLOCOMW.2011.6162493
