Transactions of Nanjing University of Aeronautics & Astronautics
Joint Iterative Decoding for Network-Coding-Based Multisource LDPC-Coded Cooperative MIMO
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Abstract:
A network-coding-based multisource LDPC-coded cooperative MIMO scheme is proposed, where multiple sources transmit their messages to the destination with the assistance from a single relay. The relay cooperates with multiple sources simultaneously via network-coding. It avoids the issues of imperfect frequency/timing synchronization and large transmission delay which may be introduced by frequency-division multiple access (FDMA)/code-division multiple access (CDMA) and time-division multiple access (TDMA) manners. The proposed joint ″Min-Sum″ iterative decoding is effectively carried out in the destination. Such a decoding algorithm agrees with the introduced equivalent joint Tanner graph which can be used to fully characterize LDPC codes employed by the sources and relay. Theoretical analysis and numerical simulation show that the proposed scheme with joint iterative decoding can achieve significant cooperation diversity gain. Furthermore, for the relay, compared with the cascade scheme, the proposed scheme has much lower complexity of LDPC-encoding and is easier to be implemented in the hardware with similar bit error rate (BER) performance.
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Project Supported:
Supported by the Postdoctoral Science Foundation of China (2014M561694); the Science and Technology on Avionics Integration Laboratory and National Aeronautical Science Foundation of China (20105552).
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