Data-Driven Code-Hopping for MC-CDMA Precoding Schemes

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Executive Summary

A novel code optimization scheme is presented for the downlink of MultiCarrier Code Division Multiple Access (MCCDMA) systems employing Phase Shift Keying (PSK) modulation. The optimization is based on dynamically re-allocating the available signature waveforms amongst the users on a symbol-by-symbol basis in order to manipulate and utilize interference amongst them. By applying the appropriate allocation criteria destructive interference between users is minimized while constructive is maximized. As a result, employing this on top of conventional schemes enhances the received Signal to Interference-plus-Noise Ratio (SINR) without additional transmitted power-per-user investment.

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