Design and Optimization of Joint Network-Channel LDPC Code for Wireless Cooperative Communications

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Executive Summary

In this paper, the authors develop a joint design method of network-channel Low Density Parity Check codes (LDPC) codes by constructing joint network-channel parity check matrix. Random network coding is performed to provide side information for both the Source and Relay's transmission. Then, the optimization of joint network-channel LDPC code is conducted in term of maximizing the system rate. Based on the joint network-channel LDPC codes, they presents a protocol for wireless cooperative communications, which is very effective to combat the channel fading without much rise in system bandwidth and transmitting power. A traditional three-node model is built to describe the protocol where relay not only helps source to transmit but also has its own information to transmit.

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