基于干扰消除的BICM-FBMC-ID接收机设计
Interference-mitigation based BICM-FBMC-ID receiver

由于第五代移动通信（5G）中异步多址机器间通信等场景的特殊需求，非正交多载波技术得到广泛关注，偏移正交幅度调制滤波器组多载波技术（FBMC/OQAM）成为候选波形之一。该文首先分析了窄带干扰（NBI）和频选信道下残余固有干扰（RⅡ）对FBMC系统的影响。分别设计了NBI消除模块和RⅡ消除模块。为进一步提高系统性能，设计了将FBMC和基于迭代译码的比特交织编码调制（BICM-ID）相结合的接收机结构，在FBMC解调器与软入软出（SISO）译码器间进行迭代的消息交换。仿真结果表明：FBMC相比CP-OFDM，对NBI具有更好的鲁棒性，因此采用擦除法消除NBI影响获得了良好的效果；且经过数次迭代后，接收机性能接近假设所有先验信息已知时的最优性能界。对于不同星座类型在迭代过程中的性能也进行了分析比较。
Abstract：Fifth generation (5G) mobile communications using asynchronous multiple access machine-to-machine communications will use non-orthogonal multicarrier signals. A filter bank-based multicarrier signal with offset quadrature amplitude modulation (FBMC/OQAM) is one candidate waveform. This study analyzed the effect of narrow band interference (NBI) and residual intrinsic interference (RⅡ) on FBMC systems. Interference mitigation models were then designed for the NBI and RⅡ for a receiver based on a combination of FBMC and bit-interleaved coded modulation with iterative decoding (BICM-ID) to further improve the performance. Simulations show that the FBMC is more robust to NBI than cyclic prefix orthogonal frequency division multiplexing (CP-OFDM). After several iterations, the receiver approaches the Genie performance bound which assumes perfectly known interference. The iterative performance of different constellation types are also compared.