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MIMO-OFDM技术已成目前第四代移动通信的核心技术,而当MIMO-OFDM系统应用于高速移动快衰落环境中时,由于限幅产生的限幅噪声将导致信道估计性能的严重下降,提出了在快速移动衰落环境下,减弱梳状导频位置处限幅噪声的一种新方法,其基本原理是插入导频前在频域内把导频位置的限幅噪声直接滤除。仿真结果表明这种新的方法能有效的改善信道估计和系统的性能。
MIMO-OFDM technology has become the core technology of the fourth generation of mobile communications. When the MIMO-OFDM system is used in high-speed mobile fast fading environment, the limiting noise caused by clipping will lead to serious degradation of channel estimation performance. A new method of reducing the clipping noise at the position of the comb-like pilot under fast moving fading environment is that the basic principle is to filter out the clipping noise of the pilot position directly in the frequency domain before inserting the pilot. Simulation results show that this new method can effectively improve channel estimation and system performance.