Multiwavelet orthogonal CDMA

According to the theory of multiwavelets, a signal can be decomposed into a combination of its projects on wavelet spaces, and the coefficients can be obtained from signal samples by using prefiltering and multifiltering. Since multiwavelets and their translations, whose time-frequency features can be specially designed, overlap in time domain, if they are used as chips in CDMA systems then linearly independent sets of signature waveforms with larger capacity and special time-frequency property can be designed. Based on this principle, applying the recent results on multifiltering, prefiltering and balancing to multiuser detection, we propose a theoretical frame of multiwavelet-based orthogonal code division multiple access (M-OCDMA) systems. Both analysis and simulation show that M-OCDMA systems have better interference-resistant performance. In addition, the computation for decoding is sharply reduced.