MIMO-OFDM系统的半盲迭代接收机

Semi-Blind Iterative Receiver for MIMO-OFDM System

针对存在多载波窄带干扰的多输入多输出正交频分复用系统,本文提出了基于马尔可夫链蒙特卡罗方法的迭代接收机.该方法不仅可以精确地估计出信道脉冲响应,还可以估计出噪声方差以及脉冲噪声发生的位置,这样接收机能够对窄带干扰区别对待,从而有效提高系统性能.该方法的另一个优点是,易于和软输入软输出译码结合,从而完成Turbo接收.仿真结果表明,在慢衰落信道下,与理想信道状态信息下的接收算法仅有3dB差别.

A joint channel estimation and data detection scheme which is based on Markov chain Monte Carlo （MCMC） is proposed for multiple-input multiple output orthogonal frequency division multiplexing （MIMO-OFDM） systems with multi-tone narrow-band interference （MTNBI）. The channel impulse response, the noise variance and the indicator of the impulse noise can be estimated accurately, and then the receiver knows whether the signal is interfered by the narrow band interference. One of the most attractive advantages of MCMC method is that it can cooperate with soft-input soft-ouput decoding,and thus it can be used in Turbo detection and complete the turbo detection. Simulation results show that compared with the receiver with ideal channel state information, the proposed receiver only has 3dB performance loss under the slow fading channel.