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扩频与信道编码技术均能实现通过增加带宽换取信噪比的降低和误比特率的下降。为了分析在卷积纠错编码与直扩相结合的情况下,卷积纠错编码对系统性能的影响,本文设计了基于卷积纠错编码的直扩通信系统,利用Matlab/Simulink仿真平台建立了系统仿真模型,仿真结果表明,在卷积编码直扩通信系统中,在码率和约束长度一定时,卷积码采用Viterbi译码的软判决方式比采用硬判决方式更能有效遏制误码情况的发生,并且卷积码的码率对系统性能的影响也十分明显。
Spread spectrum and channel coding techniques can be achieved by increasing the bandwidth in exchange for lower SNR and bit error rate of decline. In order to analyze the effect of convolution error correction coding on system performance in the case of convolution error correction coding and direct expansion, this paper designs a DSSS communication system based on convolution error correction coding, using Matlab / Simulink simulation platform The simulation results show that the soft decision method of Viterbi decoding of convolutional codes is more effective than the hard decision method in convolutional coding DSSS communication system when the code rate and constraint length are constant The situation occurs, and the convolutional code rate on the system performance is also very obvious.