瑞利信道中无线通信设备误码率测试仪实现

BER tester for wireless communication system in Rayleigh channel

误码率是衡量无线通信设备性能的重要指标。为了获得待测设备在衰落信道下的误码性能,传统方法需要进行外场实验,成本高,效率低。针对这一问题,本文基于现场可编程门阵列(FPGA),采用查找表正弦叠加法,实现了能够模拟单径瑞利衰落信道的误码率测试仪。实验数据表明,在置信度为0.95的假设检验中,经过模拟信道的BPSK信号包络样本服从瑞利分布;测量误比特率为10?3、观测样本数达到4×106个,所研制误码率测试仪在理论误比特率±5%的置信区间内,置信度不小于0.99,能够满足单径瑞利信道中无线通信设备的误码率性能测试,有效降低了测试时间和成本。

The bit error rate（BER） is an important measure of performance in wireless communication systems.In the fading channel,tradition methods test the BER of communication systems in outfield,which leads high cost and low efficiency.For this problem,a BER tester based on FPGA is frdigned,which can simulate one-path Rayleigh fading channel with look-up table Sum-of-Sinusoid（SoS） method.By hypothesis testing method,processed data show the envelope of BPSK signal follows Rayleigh distribution at 0.95 confidence level.With BER of 10？3 and 4×106 sampling data,the 0.99 confidence interval of BER tester is within ±5% of theoretical BER,which satisfies the BER testing for wireless communication systems in one-path Rayleigh fading channel and cut down the testing cost efficiently.