一种过饱和小波包分多址系统及其多用户检测方法

A multi-user detection method of over-saturated wavelet packet division multiple access communication

提出一种过饱和小波包分多址系统,该系统首先保证过饱和地址之间相互正交,然后尽量选择小尺度的过饱和地址.并根据该系统中多址干扰的特点,提出分组串行干扰删除多用户检测方法.在AWGN信道和单径Ray-leigh衰落信道下的仿真结果表明,该系统可以提供比正交多址系统更高的容量,误码率仅稍微高于正交多址系统和最小尺度过饱和小波包分多址系统,性能可以接受.并且串行干扰删除多用户检测方法复杂度是用户数的线性次方,收敛速度较快.

A novel Over-Saturated Wavelet Packet Division Multiple Access （OWPDMA） system is presented, in which over-saturated codes are orthogonal to each other and are located in the scale as low as possible in the tree structure of wavelet packet. According to the property of Multi-Access Interference （MAI）, a novel Packet Successive Interference Cancellation （PSIC） method is proposed as Multi-User Detection （MUD） algorithm. Computer simulation results in AWGN channel and single path Rayleigh fading channel demenstrate that the novel system, with mere capacity than orthogonal WPDMA code set, has the perfomumce weakly inferior to orthogonal WPDMA code set and Lowest Scale OWPDMA code set. PSIC MUD method has the complexity linear with the number of users, with good convergent tendency.