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On Carrier Spacing in Multicarrier CDMA Systems
Ha H. NGUYEN Ed SHWEDYK
IEICE TRANSACTIONS on Communications
Publication Date: 2004/03/01
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
CDMA, multicarrier-CDMA, carrier spacing,
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This letter considers multicarrier CDMA systems using rectangular chip waveform, where each user's data stream is serial to parallel converted to a number of lower rate streams. Each lower rate stream is then spread by a random spreading code and a suitable chip rate before modulating orthogonal carriers. It is shown that, for a fixed system bandwidth and a given number of carriers, there exists an optimal carrier spacing that minimizes the multiple access interference. Numerical examples also show that the multicarrier DS-CDMA system previously proposed in performs very close to the muticarrier CDMA system using the optimal carrier spacing.