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A Study of Band-Limited Chip Waveforms for Asynchronous DS-CDMA Systems
Ha H. NGUYEN
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/08/01
Print ISSN: 0916-8508
Type of Manuscript: LETTER
Category: Spread Spectrum Technologies and Applications
DS-CDMA, interference cancellation, chip waveform shaping,
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This letter studies the impact of chip waveform shaping on the multiple access interference (MAI) in band-limited direct sequence code-division multiple access (DS-CDMA) systems. The family of band-limited waveforms with zero interchip interference (ICI) and with an excess bandwidth β in the range 0β 1 is considered. A criterion for the performance comparison of various band-limited chip waveforms based on the elementary density function is established. The effect of varying the roll-off factor of a band-limited chip waveform on the MAI level is also investigated.