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在双向中继网络(TWRN)中采用差分调制,解决了接收机需要对信道状态信息进行估计的问题,但性能仍有待提升。文章针对双向相乘中继提出一种广义的差分调制(GDM)和检测方法。源数据帧分成若干数据块,每个块由一个参考符号(RS)和多个一般符号(NS)组成,相邻参考符号进行差分,一般符号与块内参考符号差分。经过双向相乘中继,接收端不需要知道信道状态信息就可以恢复数据比特。文章分析了该方法的误比特率(BER)性能,并对块内参考符号和一般符号进行了功率分配来最小化误比特率。仿真结果表明相比传统差分调制的MF中继,该方法有较低的误比特率。
Adopting differential modulation in two-way relay network (TWRN) solves the problem that the receiver needs to estimate the channel state information, but the performance still needs to be improved. This paper presents a generalized differential modulation (GDM) and detection method for bidirectional multiplying relay. The source data frame is divided into a plurality of data blocks. Each block consists of a reference symbol (RS) and a plurality of general symbols (NS). The adjacent reference symbols are differentiated, and the general symbols are differentiated from the reference symbols in the block. After two-way multiplication relay, the receiver does not need to know the channel state information can recover the data bit. The article analyzes the bit error rate (BER) performance of the method, and allocates the power of reference symbols and symbols in the block to minimize the bit error rate. The simulation results show that this method has a lower bit error rate than MF differential relay.