相位误差对OFDM无线图像传输系统的影响  

Impact of Phase Error on OFDM Wireless Image Transmission Systems

作　　者：王靖[1] 施刚[1] 

机构地区：[1]南京人口管理干部学院信息科学系,南京210042

出　　处：《电讯技术》2012年第10期1608-1613,共6页Telecommunication Engineering

基　　金：江苏省高校自然科学研究计划项目(09KJD510006);江苏省大学生创新训练计划项目(2011JSCXXL12)~~

摘　　要：正交频分复用(OFDM)技术应用于无线图像传输可解决由于图像数据量大带来的传输效率问题,但系统子载波相位误差影响着OFDM图像传输质量。首先推导出一种相位误差存在时MPSK信号误符号率近似式,然后,利用该近似式对带有相位误差的MPSK调制OFDM图像传输系统的性能及图像接收质量进行了研究。结果表明,子载波相位误差会对OFDM系统性能产生显著的影响,且当MPSK相位误差增大至π/M(M为MPSK调制电平数)时,增加信噪比已无助于OFDM图像质量的改善。The inefficient transmission problem associated with large data quantities of wireless images may be resolved with the orthogonal frequency division multiplexing（OFDM） technology,but the phase error in sub-carriers still affects the OFDM image quality.The approximative expression for the symbol error rate（SER） of the MPSK system with phase error is derived and then by using the expression,the SER and the received image quality of the OFDM system modulated by MPSK with phase error are simulated.Results show that the phase error in sub-carriers has an obvious influence on the performance of an OFDM system,and there is no helpful improvement of the image quality by increasing the SNR when the phase error increases to π/M where M is MPSK modulation level number.

关 键 词：OFDM 图像传输 MPSK调制 相位误差 误符号率 图像质量 

分 类 号：TN919[电子电信—通信与信息系统]