Pre-equalization Techniques for Downlink and Uplink TDD MC-CDMA Systems
Wireless Personal Communications: An International Journal
IEEE Transactions on Wireless Communications
A hybrid MC-CDMA precoding scheme employing code hopping and partial beamforming
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Transmission Strategies for MISO Downlink MC-CDMA Mobile Systems
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
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We discuss a prefiltering technique for interference mitigation in the downlink of a time division duplex (TDD) multicarrier code-division multiple access (MC-CDMA) system. The base station (BS) is equipped with multiple transmit antennas, and channel state information (CSI) is obtained at the transmitter side by exploiting the channel reciprocity between uplink and downlink transmissions. The prefiltering coefficients are designed so as to minimize a proper cost function that depends on the signal-to-interference-plus-noise ratios (SINRs) at the mobile terminals (MTs). The resulting scheme allows using a simple despreading receiver, thereby eliminating the need for channel estimation and equalization. Numerical results show the advantages of the proposed scheme over some existing solutions.