π/4DQPSK抗噪声性能仿真与分析

Simulation and analysis of the performance of π/4DQPSK

基于π/4DQPSK调制方式,利用均衡技术减小码间干扰,以及提高系统抗噪声性能的方法,在加性高斯白噪声(AWGN)信道中,对存在相位漂移的情况下的π/4DQPSK系统的抗噪声性能,以及存在码间干扰时和通过均衡后系统的抗噪声性能,并同理论值进行了比较分析研究。仿真结果表明迫零均衡能够有效地减小码间干扰,很好提高系统的抗噪声性能。

Based on the analysis of π/4DQPSK,the equalization technique was used to reduce intersymbol interference（ISI） and to improve the performance of the system. The performance of the BPSK,FSK and π/4DQPSK was analyzed in an additive Gaussian white noise channel（AWGN）. The performance of the π/4DQPSK system was examined when there was a phase drift ,which was also analyzed when there was ISI and equalization. The simulation results were compared with the theory,which clearly demonstrated that zero-forcing equalization can reduce the ISI effectively and improve the performance of the system.