短报文的高效编码与MSK非相干检测技术研究

Research on Efficient Coding for Short Message Transmission and MSK Noncoherent Technology Detection

咬尾卷积码采用咬尾方式消除尾零占据的开销,极大地提高短报文的传输效率,在短报文传输上具有重要的应用价值。论文将咬尾卷积码与最小频移键控结合,设计了TBCC-MSK级联实现方案。为了避免相位估计开销,采用最大似然非相干检测的方式,分别从有编码和无编码的角度,仿真分析不同参数下编码系统的性能,并与相干检测进行比较。结果表明,在无编码时,MLNCD算法可以逼近理想相干解调性能,有编码时,MLNCD算法可以充分发挥TBCC编码性能。

Tail-biting convolutional code is used to eliminate the overhead occupied by tail zeros in the tail-biting method and greatly improves the transmission efficiency of short messages.It has important application value in short message transmission.In this paper,the TBCC-MSK cascade realization scheme is designed by combining tail-biting convolutional codes with minimum shift keying.In order to avoid the overhead of phase estimation,the maximum likelihood noncoherent detection method is used to simulate and analyze the performance of the coding system under different parameters from the perspective of coding and non-coding that are compared with coherent detection.The MLNCD algorithm can approach the ideal coherent demodulation performance with⁃out coding is shown,and the MLNCD algorithm can give full play to the TBCC coding performance with coding.