Multi-media communication is one of the main goals for the development of the third generation wireless communication system. Wavelets are known to provide better flexibility on handling multi-rate data. However, the frequency-selective and the time-varying nature of the wireless channels inevitably cause intercarrier interference (ICI) among wavelets. To solve the problem, we propose a unitary mapping filter on wavelets to achieve the optimum water-filling solution. Simulations compare the performance of the communication system using the proposed algorithm with the conventional direct sequence code division multiple access (DS-CDMA) system and the wavelet communication system with no unitary mapping filters, and confirm significant advantages of the proposed algorithm.
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