Adaptive Multi-User Equalizer Using Multi-Dimensional Lattice Filters for DS-CDMA (Special Section on Information Theory and Its Applications)
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概要
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This paper proposes and investigates the adaptive multi-user equalizer based on the multi-dimensional IIR adaptive lattice filter in order to suppress the co-channel interference(CCI) in asynchronous DS/CDMA system. An asyn-chronous DS/CDMA system with multi-user receiver is modeled as a multi-dimensional or multi-input/out system with cross-coupling that is co-channel interference. From the system model it is shown that the multi-user detection is reduced into a problem of multi-dimensional equalization for multiaccess interference as well as intersymbol interference. The proposed multi-user equalizer can improve the equa1izing error of the filter, comparing with that of the multi-dimensional FIR transversal filter of which number of tap is finite. The multi-dimensional lattice filter can adaptively achieve fast and stable convergence with less taps. Since the filter can resolve correlative multiple input into orthogonal out-put stage by stage, CCl can be removed. Computer simulations show performance of the proposed scheme.
- 1996-09-25
著者
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Kohno Ryuji
The Faculty Of Engineering Yoko Hama National University
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Jitsukawa Daisuke
The Faculty Of Engineering Yokohama National University
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