摘要
针对对抗无线信道多径衰落的正交频分复用(orthogonal frequency division multiplexing,OFDM)系统,本文提出了一种联合时域和频域的信道估计方法。本方法联合前导序列和较少的导频数据,分别在时域和频域上完成信道估计,可以获得完整的信道信息,降低了移动环境传输错误概率;通过用PN序列代替数据帧循环前缀进行时域信道均衡,提高了信道估计的精确性,减少了传统伪随机序列OFDM信道估计遇到的符号间干扰。仿真结果表明,在Rayleigh多径信道和城市环境HIPERLAN/2D信道下,相同信噪比下,该信道估计方法接收误码率要明显低于只利用导频的频域信道估计接收误码率。
To fight against the affect of multipath fading radio channel over OFDM system, this paper presents a method of channel estimation combinationd time_domain and frequency_domain techniques.The method joints preamble sequence and less pilot data to complete the channel estimation respectively in the time domain and frequency domain, then a full channel information can be obtained and the transmission error probability of the mobile environment can be reduced; Time-domain channel information which was equalizationed by PN sequence instead of cyclic prefix of the data frame can improve the accuracy of channel estimation and reduced inter-symbol interference caused by the OFDM channel estimation of traditional pseudo-random sequence. Simulation results show that under Rayleigh multipath channel and the urban environment HIPERLAN / 2D channel and the same signal to noise ratio, the error rate of this method was significantly lower than the error rate of the method of frequency_domain channel estimation which only used the pilots..
出处
《电子技术（上海）》
2015年第8期44-46,共3页
Electronic Technology
关键词
正交频分复用
信道估计
误码率
orthogonal frequency division multiplexing
channel estimation
the error rate
