CAJ | 학술논문

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。
침대대항무선신도다경쇠락적정교빈분복용（orthogonal frequency division multiplexing,OFDM ）계통，본문제출료일충연합시역화빈역적신도고계방법。본방법연합전도서렬화교소적도빈수거，분별재시역화빈역상완성신도고계，가이획득완정적신도신식，강저료이동배경전수착오개솔；통과용PN서렬대체수거정순배전철진행시역신도균형，제고료신도고계적정학성，감소료전통위수궤서렬OFDM신도고계우도적부호간간우。방진결과표명，재Rayleigh다경신도화성시배경HIPERLAN/2D신도하，상동신조비하，해신도고계방법접수오마솔요명현저우지이용도빈적빈역신도고계접수오마솔。
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..