Design and analysis of polar coded cooperation with incremental redundancy for IoT in fading channels

In this study, a coded cooperation scheme using polar codes is explored for high-reliability and low-user complexity applications such as Internet of Things. Firstly, the cooperation way among the users is carefully designed based on systematic polar codes and cooperative decoding, without decode-and-forward protocol at the cooperative user. Meanwhile repetition aided code construction and decoding algorithm of polar code is proposed for the non-cooperative case in terms of imperfect inter-user channel. Performance analysis and numerical simulation demonstrate the bit-error-rate advantages of proposed polar coded cooperation in fading channels, compared to the no-cooperation case and normal coded cooperation schemes. Furthermore, overall rate of proposed polar-coded cooperation is considered to optimize adaptively to increase throughput efficiency.