机构地区: 北京邮电大学信息与通信工程学院泛网无线通信教育部重点实验室
出 处: 《北京邮电大学学报》 2008年第1期35-39,共5页
摘 要: 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.该方案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.该算法具有较低计算复杂度,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,系统性能明显改善.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. A pilot aiming at mitigating the inter-ceil 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.