摘要
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。
As the subcarrier in wavelet packet division multiplexing （WPDM） system, wavelet packet basis function needs to have continuous resolutions, but it is difficult to realize in practice, so it usually needs to approximate the coefficients. By using the method of iterative convolution, it is to make discrete approximation of the wavelet packet basis function, thus the constructed subcarriers can meet the requirements on orthogonality of wavelet packet basis function. Meanwhile, the multicarrier modulation is realized, and the system is compared with the orthogonal frequency division multiplexing （OFDM） system in multipath channels. The simulation results show that, WPDM system presents better performance in the inhibition of ISI and ICI and the influence of timing deviation.
出处
《半导体光电》
CAS
北大核心
2015年第2期271-274,279,共5页
Semiconductor Optoelectronics
关键词
小波包分复用
迭代卷积
小波包基函数
子载波构造
多载波调制
wavelet packet division multiplexing
iterative convolution
wavelet packetbasis function
subcarrier structure
multicarrier modulation
