【摘要】 分析了无相互交叉干扰完全重构的多路器特点,给出了固定长度(N=2mM)正交余弦调制滤波器组设计完全重构低延时多路复用器的方法,探讨了利用双正交任意长度(N=2mM-2β)余弦调制滤波器组设计完全重构多路器的条件和方法,推算出多路器系统时延公式.这样可以任意选择滤波器的长度,减少系统延时.更多还原

【Abstract】 Perfect reconstruction (PR) transmultiplexers have found a wide application in multi-user communication. First, a method for designing a PR transmultiplexers (PR-TMUX) based on cosine modulated filter banks (CMFB) of the linear-phase prototype filter of length N=2mM, where M is the number of channels, is presented in this paper. Second, we have investigated the design of PR transmultiplexers with a low delay based on arbitrary-length biorthogonal CMFB. An analysis of PR transmultiplexers based on arbitrary-length biorthogonal CMFB is made. Thus a necessary and sufficient condition for such a PR-TMUX is obtained. This makes us have more choices on the length of the prototype filter of the CMFB. Moreover, the delay of the biorthogonal PR-TMUX can be reduced. A design example is given to illustrate the proposed method.更多还原