【摘要】 正交频分复用(OFDM)利用保护间隔(GI)消除因多径时延而产生的符号间干扰(ISI)和载波间干扰(ICI),但是太长的GI会占用过多的信道资源。为此,在保持一定GI长度的情况下,提出了利用减法抵消法消除ISI和加法抵消法抵消ICI的多径干扰抵消(MPIC)方法,使得当多径时延大于GI时,仍然可以保持系统的低误码率以及较强的抗多径干扰的优异性能。蒙特卡洛仿真结果表明,有多径干扰的情况下,在Turbo码编码的MIMO OFDM系统中使用提出的多径干扰抵消方法可以更有效地减少ISI和ICI。更多还原

【Abstract】 Because orthogonal frequency division multiplexing (OFDM) offers a very good way to combat multi-path interference, it seems quite a popular technology for 4th generation mobile system. This advance is obtained at the expense of channel resource for using guard interval (GI) length. Therefore GI should be finite or short enough. Multi-path interference cancellation (MPIC) method is proposed for Turbo coded MIMO OFDM system in this paper to minimize the inter-symbol-interference (ISI) and inter-carrier-interference (ICI) when multi-path delay is longer than GI length. The simulation results show the presented method is quite efficient in eliminating multi-path interference and system performance can be improved greatly.更多还原