多小区下的MIMO OFDM的导频设计和信道估计

为了抑制多入多出正交频分复用（MIMO OFDM）系统小区间信道估计的多址干扰，提出了一种导频设计方案. 该导频可以使干扰能量均匀分布在所有信道延时采样点上，使小区间干扰白化. 根据该导频的特性，提出了一种改进的频域最小二乘信道估计算法. 该算法具有低计算复杂度，在信道多径延时未知的情况下仍可以有效抑制来自邻小区的干扰，使系统性能得到明显改善. 通过仿真证明了导频设计的合理性和信道估计算法的正确性.

Pilot Design and Channel Estimation in Multi-Cell MIMO OFDM Systems

A pilot aiming at mitigating the inter-cell interference of channel estimation in multi-input multi-output (MIMO) orthogonal frequency division multiplex (OFDM) systems is designed. The proposed pilot can make the power of interference distribute evenly over all the multi-path delays, so the inter-cell interference is similar to white noise. Based on characteristics of the proposed pilot, an improved frequency domain least squares (LS) channel estimation method is proposed. The algorithm is of low complexity, and is able to mitigate the inter-cell interference effectively even at existing of unknown multi-path delays, therefore, the performance of system will be improved significantly. Simulations validate the pilot design method and the channel estimation algorithm.