MC-CDMA as a Broadcast Channel: Performance Practical Upperbound using DPC and Beamforming Principles

This paper addresses a complementary vision on the MC-CDMA technology as a standard broadcast channel (BC) to take advantage of related work on this topic. Downlink (DL) MC-CDMA typically shows a limited satisfactory performance due to the required simplicity of receivers and also the non practical cooperation between them. This performance may be significantly improved using precoding strategies shifting the cooperative process to the base station. Our proposal closes the optimum DPC (dirty paper coding) performance implementing a combination of ZF-DPC as a precoder and a receiving matched filter designed maximizing the sum rate criteria. This approach resembles the Tomlinson-Harashima (T-H) precoder in combination with generalized beamforming principles, suggesting an implementation with acceptable complexity