论文部分内容阅读
为改进正交频分复用(OFDM)系统在多径衰落信道下的解调性能,提出了基于自适应Wiener反卷积滤波反馈环路的接收算法,对多径衰落信道进行白化处理,使处理后的信道噪声接近于加性高斯噪声(AWGN)。该文推导了OFDM系统中反卷积滤波器抽头系数的估计算法及其在非时变和时变信道中的自适应迭代算法,并且讨论了系统中定时估计、载波频率估计和信道估计算法(它们都是在AWGN信道环境下的算法)的使用方法。仿真表明:该算法可以有效地降低多径衰落的影响,得到优良的解调性能。
In order to improve the demodulation performance of Orthogonal Frequency Division Multiplexing (OFDM) system over multi-path fading channels, a new receiving algorithm based on adaptive Wiener deconvolution filter feedback loop is proposed to whiten the multipath fading channels so that The processed channel noise is close to additive Gaussian noise (AWGN). This paper deduces the estimation algorithm of deconvolution filter tap coefficients in OFDM system and its adaptive iterative algorithm in time-invariant and time-varying channels, and discusses the timing estimation, carrier frequency estimation and channel estimation algorithm in the system ( They are all used in the AWGN channel environment). The simulation results show that this algorithm can effectively reduce the influence of multipath fading and get excellent demodulation performance.