Design of nonuniform cosine-modulated filter-banks with the perfect-reconstruction property and arbitrary filter lengths |
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作者姓名: | XIE Xuemei |
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作者单位: | School of Electronic Engineering,Xidian University,Xi'an 710071,China |
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基金项目: | Supported by National Natural Science Foundation of China (Grant Nos. 60672125 and 60372047) |
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摘 要: | In this paper, a method is proposed to construct recombination nonuniform cosine-modulated filter banks (CMFBs) with a perfect-reconstruction property and with arbitrary filter lengths. In this filter bank (FB) structure, certain channels of an original M-channel uniform FB are merged by a set of transmultiplexers (TMUXs), yielding nonuniform outputs, and the length restrictions on the original CMFB and the recombination TMUXs are avoided, allowing them to have arbitrary filter lengths. By imposing certain improved matching conditions on the prototype filters, nonuniform FBs with arbitrary filter lengths and with good properties can be obtained. As a result, the flexibility of selecting modulation types and filter lengths is greatly increased in the design of recombination nonuniform CMFBs. Another benefit due to the flexibility is that the system delay can be reduced.
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Design of nonuniform cosine-modulated filter-banks with the perfect-reconstruction property and arbitrary filter lengths |
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Authors: | XIE Xuemei |
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Institution: | School of Electronic Engineering, Xidian University, Xi'an 710071, China |
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Abstract: | In this paper, a method is proposed to construct recombination nonuniform cosine-modulated filter banks (CMFBs) with a perfect-reconstruction property and with arbitrary filter lengths. In this filter bank (FB) structure, certain channels of an original M-channel uniform FB are merged by a set of transmultiplexers (TMUXs), yielding nonuniform outputs, and the length restrictions on the original CMFB and the recombination TMUXs are avoided, allowing them to have arbitrary filter lengths. By imposing certain improved matching conditions on the prototype filters, nonuniform FBs with arbitrary filter lengths and with good properties can be obtained. As a result, the flexibility of selecting modulation types and filter lengths is greatly increased in the design of recombination nonuniform CMFBs. Another benefit due to the flexibility is that the system delay can be reduced. |
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Keywords: | recombination nonuniform cosine-modulated filter bank transmultiplexer perfect-reconstruction arbitrary-length |
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