By combining channel coding and virtual MIMO transmission, coded cooperation could achieve coding gain and diversity gain simultaneously, making it a good candidate for the key technologies enabling ultra-high speed 5G communications. As the first ever provably capacity achieving codes, Polar codes naturally sticks out to be one of the most competitive coding technologies for coded cooperation. In this paper, we aim to propose methods that can fully explore the performance potential of Polar coded cooperation under fading channels. Specifically, Polar coded cooperation by adopting the Plotkin construction for sub-codeword generation is used as the basic method. Then, three codeword shaping methods are proposed to improve the performance of the basic method. The first one is to introduce an interleaver at the receiver terminal to help combat the burst errors. On this basis, the idea of information-refreezing is used to improve the sub-codeword decoding performance on the interuser channels, which in turn increases the cooperation probability. And lastly, the codeword generation scheme is extended from non-systematic Polar codes to systematic Polar codes so that a systematic coding gain is further achieved. The proposed three shaping methods can be used either singly or superimposedly. Simulation results show that under slow fading channels, the system performance in terms of bit error rate can be significantly improved over that of existing Polar coded cooperation method.
Codeword Shaping Enhanced Polar Coded Cooperation under Fading Channels
2017-09-01
234764 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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