Computer-Based Study of the Effect of Phase Noise in 256-Quadrature Amplitude Modulation Using Error- Rate Calculation Block -- A Comparative Study

Abstract

This work is aimed at verifying the result obtained by Efuribe and Asiegbu. In the study carried out by Efuribe andAsiegbu, it was discovered that the effect of phase noise on transmitted signal is more when the phase noise leveldensities are high. These were shown vividly on the display of the scatter plot scopes, which where used for the study.But in this case, it was decided to use the values generated by the Error-rate Calculation block, and compare the resultsusing the same parameters for simulation; as were used in the former case. Values generated by the Error-rate block fordifferent noise levels where shown in table 4.1. The phase noise level density (PNLD) was varied from -20dBc/Hz to -120dBc/Hz in step of -20dBc/Hz; as was the case in the previous work. For each substitution, the model was simulatedand results obtained and tabulated. In all, results showed that phase noise on transmitted signal decreases as values ofPNLDs in the Phase Noise block decreases. This agrees with result obtained earlier on by Efuribe and Asiegbu.

Keywords: Phase, Noise, Quadrature, Amplitude, Modulation, Error-rate