標題: On the Optimal Power Allocation for Additive Color Noise Parallel Channels with Limited Access Constraint
作者: Wang, Shih-Wei
Chen, Po-Ning
Wang, Chung-Hsuan
Chang, Wen-Chieh
電機工程學系
Department of Electrical and Computer Engineering
公開日期: 2011
摘要: In this paper, we consider an (N, K)-limited access system consisting of N parallel additive noise channels with spatial dependency, where the receiver starts to decode the information being transmitted when at least K out of N channel outputs are received. We investigate the optimal power allocation that maximizes the minimum mutual information among all possible cases of partial reception. A universal guideline is then obtained for a group of permutation-invariant channels, in which the system mutual information remains unchanged when permuting the parameters that characterize the partial reception and signal-to-noise power ratio (SNR) of channels, that a channel with less noise power should have larger SNR. When all N channels belong to a permutation-invariant group, we also have that the optimal power allocation problem can be transformed to an equivalent problem for K parallel channels without limited access constraint via a water-filling noise-power-redistribution process. The merit of this transformation can be more evidently seen when the channel input-noise pairs are reduced to be spatially independent with distributions scaled from a common random vector, for which the optimal power allocation solution can be simply obtained by a two-phase water-filling process.
URI: http://hdl.handle.net/11536/15177
ISBN: 978-1-4577-0595-3
期刊: 2011 IEEE INTERNATIONAL SYMPOSIUM ON INFORMATION THEORY PROCEEDINGS (ISIT)
起始頁: 336
結束頁: 340
顯示於類別:會議論文