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A low-complexity power allocation for cooperative bit-interleaved coded modulation systems with adaptive decode-and-forward relaying

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3 Author(s)
Tsang-Wei Yu ; Department of Electrical Engineering, National Chiao Tung University, Hsinchu, 30010 Taiwan ; Wern-Ho Sheen ; Chung-Hsuan Wang

Transmit power allocation between source and relays is a critical design issue in a cooperative relaying system where source and relays are powered by batteries. In this paper, a low-complexity power allocation method is proposed for a 3-node cooperative bit-interleaved coded modulation system with adaptive decode-and-forward relaying, aiming to minimize the bit-error-rate at the destination. The key novelty of the method lies in transforming the power allocation into a max-min optimization problem which can be solved in a first-order equation with very low-complexity. Computer simulations show that the proposed method outperforms the equal gain power allocation with large margins in different channel conditions.

Published in:

2011 IEEE 22nd International Symposium on Personal, Indoor and Mobile Radio Communications

Date of Conference:

11-14 Sept. 2011