摘要
在传统的正交频分复用(OFDM)系统中,等间隔等功率分布的导频序列是最优的。然而,由于频谱的非连续性,这种最优的导频序列无法适用于非连续正交频分复用(NC-OFDM)系统。在基于归一化符号估计均方误差的准则下,提出了一种适用于NC-OFDM系统的次优导频设计方法。它先分配给每块频带的导频数目,然后通过一种简单的搜索方法求出每个导频的次优位置。仿真分析表明,该方法不仅具有较低的计算复杂度,而且能获得良好的信道估计性能和误码率性能。
Equispaced and equipowered pilot tones is of the optimal pilot design for conventional orthogonal frequency division multiplexing（OFDM） systems.However,this optimal design,for the non-continuous spectrum,could not be applicable to non-contiguous OFDM（NC-OFDM） system.This paper,based on minimizing the normalized mean square error of symbol estimation,proposes the suboptimal pilot design for NC-OFDM systems.This pilot design first determines the number of pilot tones for each frequency band,and then obtains the proper position of each pilot tone through a simple search method.Simulation results show that this design is of fairly low computational complexity,and could achieve good channel estimation performance and symbol error rate performance.
出处
《通信技术》
2010年第10期1-4,7,共5页
Communications Technology
