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小波包分复用(WPDM)系统中作为子载波的小波包基函数必须是连续解析的,但实际中很难得到,通常需要对其进行逼近。通过滤波器系数采用迭代卷积的方法来对小波包基函数进行离散逼近,构造出的子载波满足小波包基函数的正交性。同时用此方法实现了多载波调制,并将该系统与正交频分复用(OFDM)系统在多径时延信道下进行了比较。仿真结果表明,WPDM系统在抑制ISI和ICI方面以及对定时偏差的影响上更具优势。
The wavelet packet basis functions as subcarriers in WPDM system must be continuously parse, but it is hard to get in practice and usually needs to be approximated. The iterative convolution method is adopted to filter the wavelet packet basis function discretely. The constructed subcarriers satisfy the orthogonality of the wavelet packet basis function. At the same time, multi-carrier modulation is realized by this method, and the system is compared with Orthogonal Frequency Division Multiplexing (OFDM) system under multi-path delay channel. Simulation results show that the WPDM system has more advantages in suppressing ISI and ICI and impact on timing deviation.