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在MB-OFDM UWB系统中,导频图样对信道估计的影响较大,为了甄别这些影响,并寻找到较优的导频图样,根据信道的最大多径时延和最大多普勒频移以及取样率平衡原理来确定导频的时域和频域间隔,并通过性能仿真对比,得到不同的导频图样对信道估计算法和信道插值算法的影响。通过Matlab仿真实验表明,该方法较传统的导频图样设计方法更快速,具有更好的性能,可为不同信道估计方法中导频图样的选择提供依据。
In the MB-OFDM UWB system, the pilot pattern has a great influence on the channel estimation. In order to identify these influences and find out the optimal pilot pattern, according to the maximum multipath delay and the maximum Doppler shift of the channel and Sampling rate balancing principle to determine the pilot’s time domain and frequency domain interval, and through the performance simulation comparison, get different pilot patterns on the channel estimation algorithm and channel interpolation algorithm. The experimental results show that the proposed method is faster and has better performance than the traditional pilot pattern design and can provide the basis for the selection of pilot patterns in different channel estimation methods.