期刊
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
卷 11, 期 5, 页码 1676-1687出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TWC.2012.031212.102325
关键词
Amplify-and-forward (AF); average sum-rate lower bound; block flat fading channel model; Bayesian Cramer-Rao lower bound (CRLB); channel estimation error; cooperative communications; optimal power allocation; Pareto-front surface; relay location; training design; two-way relaying
资金
- National Science Foundation [CCF-1054687]
- Division of Computing and Communication Foundations
- Direct For Computer & Info Scie & Enginr [1054687, 1341966] Funding Source: National Science Foundation
This paper studies the impact of channel estimation error on the performance of a two-way amplify-and-forward (AF) relay network and investigates the optimal transmit resource allocation that minimizes the impact. In particular, we consider a three node network, consisting of two user terminals T-A and T-B and a half duplex relay node R, where only T-A and T-B are equipped with channel estimators. Assuming block flat fading channel model, we adopt two estimation theoretic performance metrics, namely the Bayesian Cramer-Rao lower bound (CRLB) and the mean-squared error (MSE) of the linear minimum mean square error (LMMSE) channel estimate, and an information theoretic performance metric, namely the average sum-rate lower bound, as our optimality criteria. For a fixed transmission block length and under the total transmit power constraint, we investigate the optimal training vector design, the optimal number of training symbols in the training vector, the optimal power allocation between training and data in a transmission block, and the optimal power allotment between three nodes, such that these performance metrics are optimized, via utilizing bi-objective optimization methods. Our simulation results demonstrate that the optimal solutions corresponding to each performance metric vary, as the relay location and the system signal-to-noise ratio (SNR) change. They also reveal interesting symmetry relationship between these optimal solutions and the relay location.
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