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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。
Due to the special requirements of scenarios such as asynchronous multi-access machine communication in the fifth generation mobile communication (5G), the non-orthogonal multi-carrier technology has drawn much attention and the offset quadrature amplitude modulation filter bank multi-carrier technology (FBMC / OQAM) One of the candidate waveforms. This paper first analyzes the influence of residual interference (RII) on narrowband interference (NBI) and frequency selective channel on FBMC system. NBI elimination module and RII elimination module are designed respectively. In order to further improve the system performance, a receiver structure combining FBMC with bit interleaving coding modulation based on iterative decoding (BICM-ID) is designed, which is implemented between FBMC demodulator and SISO decoder Iteration of message exchange. The simulation results show that FBMC has better robustness to NBI than CP-OFDM, so the erasure method can eliminate the effect of NBI and get good results. After several iterations, the performance of the receiver is close to the assumption of all a priori Optimal performance bounds when information is known. The performance of different constellation types in the iteration process is also analyzed and compared.