Variable Rate Transmission Schemes for CI/MC-CDMA System


During this paper, two multirate transmission schemes are proposed for carrier interferometry multicarrier code division multiple access (CI/MC-CDMA) system. System models for wide range of knowledge rates are mentioned based mostly on orthogonal property of CI codes of any length. Non-contiguous CI codes are introduced for multirate CI/MC-CDMA. Advantage of frequency diversity in non-contiguous allocation improves the performance of variable rate system over frequency selective channel. It's shown that non-contiguous allocation permits more variety of terribly high knowledge rate users compared to contiguous allocation with some increased complexity at iterative receiver.

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