脉冲噪声下的高可靠性OFDM信道估计

从信道估计内插误差角度分析了突发脉冲噪声干扰对无线OFDM接收机性能的影响,针对由脉冲噪声所导致的时间方向信道内插估计错误扩散,提出了旨在提高无线OFDM通信系统抵抗脉冲噪声能力的信道估计安全策略,包括:脉冲噪声突发位置检测、防止受损导频内插错误扩散算法、受干扰子载波数据可信度判决。仿真结果表明,在低复杂度条件下,可以显著提高无线OFDM接收机在脉冲噪声环境中的信道估计性能。

Reliable channel estimation for wireless OFDM systems with impulse noise

Compared with single carrier modulation, OFDM is inherently more immune to the impulse noise, but additional measures to cancel the impulse noise are required for a satisfactory system performance in wireless reception environments. In this paper, we present the theoretical analysis of the channel interpolation estimation performance of OFDM receiver under bursty impulsive noise channels. A scheme designed specifically for combating impulse noise including impulse noise burst position detection, corresponding channel estimation and reliability metric decision of transmitted signals is presented. In the proposed scheme, pilots of the other OFDM symbols are used to construct reliable channel estimation pilots corrupted by impulse noise. The simulation result shows the scheme proposed can provide a compatible improvement to channel estimation performance for compensating the effect of impulse noise in actual wireless OFDM receivers with low complexity.