宽带无线OFDM系统调制算法的仿真分析

Simulation and Analysis of Modulation Algorithm for Broadband Wireless OFDM System

为了根据信道条件的变化,动态地选择适当调制方式,以便最大限度地提高频谱利用率,文章采用正交频分复用(OFDM)的多载波技术,提供了在OFDM子载波上MQAM、MPSK等调制方式的仿真测试,得出了MQAM的容噪性能星座图和误比特率曲线,MPSK和MQAM误比特率随M取值的变化情况。这些分析结果为在第四代移动通信系统中,根据不同信噪比环境选择合适的调制方式提供了参考依据。

In order to maximize frequency spectrum efficiency,The appropriate modulation system is selected dynamically according to the channel conditions.Based on orthogonal frequency division multiplexing（OFDM） for multi-carrier technology,MQAM and MPSK simulation test is provided in the OFDM subcarriers,obtained MQAM noise insensitive constellation and bit error rate curves.MPSK and MQAM BER changes with the M values was shown.also.These results provide a reference to select the appropriate modulation for different SNR environment in the fourth generation mobile communication system.