The nonlinearity of amplifier makes the performance of modulation signals deteriorated. This paper establishes a simulation model by using Simulink, and bit error rate of constant envelope modulation (MSK) and non-constant envelope modulation (BPSK) signals through the linear and nonlinear power amplifier are simulated, and under the condition of bandwidth constraints, the impact of adjacent channel interference on bit error rate is analyzed. Experimental results show that nonlinear power amplifier has a greater impact on non-constant envelope-modulation, and especially in the case of smaller channel-space, the bit error rate performance of the non-constant envelope-modulation has deteriorated sharply. The paper provides an analysis method for practical digital communication system.%功放的非线性会带来调制信号的性能恶化,基于simulink建模,对比仿真了恒包络调制MSK和非恒包络调制BPSK,在功放线性和非线性区域时的误码性能,以及在带宽受限条件下,相邻信道干扰对信号误码性能影响.仿真结果表明,功放饱和对非恒包络调制信号影响更大,尤其是信道间隔较小的情况下,非恒包络调制信号的误码性能恶化严重.该研究为数字通信系统的工程设计提供了一种可借鉴分析方法.
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