Nonlinear amplifier effects in digital modulation signals
Gan Ming · Modern Electronics Technique · 2012
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.