Abstract
This paper investigates the effect of chip waveform shaping on multiple access interference (MAI) in band-limited direct sequence code-division multiple access (DS-CDAM) systems. In particular, it concentrates on the family of band-limited waveforms with zero interchip interference (ICI) and with arbitrary excess bandwidth /spl beta/ in the range 0 /spl les/ /spl beta/ /spl les/ 1. A criterion for the performance comparison of various band-limited chip waveforms based on the elementary density function is introduced. The comparison is made among different chip waveforms, including the optimal chip waveform, the square-root raised cosine proposed for 3G wireless systems and the previously proposed better than Nyquist pulse. Finally, the effect of varying the roll-off factor of a band-limited chip waveform on the MAI level is also investigated.
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