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文章将广义差分调制与模拟网络编码技术相结合,给出了一种基于广义差分调制与模拟网络编码的双向多中继系统。通过对系统的和误码率进行理论推导,得到了选择一个中继时系统的和误码率的闭式表达式,在此基础上给出了一种基于和误码率最小化的中继选择方法。仿真结果表明,与传统的基于差分调制的双向中继系统相比,提出的基于广义差分调制与模拟网络编码的双向中继系统具有更低的误码率。在多中继系统中,提出的基于和误码率最小化的中继选择方法能够有效改善多中继系统的误码率性能。
The article combines generalized differential modulation with analog network coding technology, and presents a bidirectional multi-relay system based on generalized differential modulation and analog network coding. By theoretically deducing the bit error rate of the system and deriving the closed expression of the bit error rate of the system when selecting a relay, a relay based on the bit error rate minimization is given Method of choosing. The simulation results show that compared with the traditional two-way relay system based on differential modulation, the bidirectional relay system based on generalized differential modulation and analog network coding has a lower bit error rate. In multi-relay systems, the proposed relay selection method based on minimization of bit error rate (BER) can effectively improve the bit error rate performance of multi-relay system.