Rate compatible modulation is a novel adaptive transmission technology that does not require channel state information feedback, can achieve rate adaptive adjustment, and smoothly approach channel capacity. However, due to the nature of incremental decoding, the decoding complexity is too high and the transmission performance is reduced under bad channel conditions. Based on the feature of the systematic Polar code that separates the information bits and the check bits, this paper optimizes the design of the hybrid cascade of the systematic Polar code and rate-compatible modulation, and proposes a feasible scheme for adjusting the corresponding weight of check bits. The simulation results show that the proposed scheme can achieve better transmission performance in a wider range of signal-to-noise ratio with relatively lower decoding overhead.

速率兼容调制是一种不需要信道状态信息反馈、可以实现速率自适应调整、平滑逼近信道容量的新型自适应传输技术。然而，由于增量解码的性质，解码复杂度太高，在不良信道条件下传输性能下降。基于系统Polar码将信息比特与校验比特分离的特点，优化了系统Polar码与速率兼容调制的混合级联设计，提出了一种可行的方案来调整相应的权重。检查位。仿真结果表明，该方案可以在较宽的信噪比范围内实现较好的传输性能，且解码开销相对较低。