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首次定量分析了准同步CDMA系统反向链路的多址干扰分量大小,并给出在限带信道情况下,反向链路信扰比的大小。同时也给出对于限带信道,Chip成型滤波器对于准同步CDMA正交码正交性的影响程度的定性分析。基于以上的分析,本文提出一种新的基于准同步CDMA系统的成型滤波器设计思想,综合考虑反向链路多址干扰、Chip间串扰、邻频干扰,我们得出成型滤波器的设计参数对于系统反向链路信扰比的优化值。最后的计算机仿真结果证明了本文设计的成型滤波器的优越性。
For the first time, the size of the multiple access interference components in the reverse link of a quasi-synchronous CDMA system is quantitatively analyzed. The magnitude of the signal to interference ratio in the reverse link is given in the case of a limited-band channel. At the same time, the qualitative analysis of the effect of Chip shaping filters on the orthogonality of orthogonal CDMA orthogonal codes is given. Based on the above analysis, this paper presents a new design method of shaping filter based on quasi-synchronous CDMA system. Considering multiple access interference of reverse link, crosstalk between chips and adjacent frequency interference, we get the design parameters of shaping filter Optimized value for the SINR of the system reverse link. The final computer simulation results demonstrate the superiority of the shaping filter designed in this paper.