A New Dynamic Partial Precoding Technique for Mc-Cdma Systems Employing Psk Modulation
A new precoding technique for MC-CDMA is presented, that outperforms conventional precoding by exploiting useful interference. This is done by selectively pre-decorrelating users to destructive interference while allowing interference when it is expected to contribute to their signal. The resulting SINR improvement is achieved by making use of energy existent in the system so performance enhancement is attained without the need for increased transmitted power-per-user. This, however, comes at the expense of additional processing at the transmitter for the allocation of the dynamic precoding matrix. The proposed technique applies to the downlink of cellular MC-CDMA systems. Comparative simulations of this and other precoding methods provide evidence that the proposed method offers significant performance benefits.
KeywordsMC-CDMA precoding adaptive signal processing interference multiuser channels suppression
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