Pre-Equalization Techniques for MC-CDMA Systems without Cyclic Prefix

For an increased bandwidth efficiency, a TDD MCCDMA system with cyclic prefix inserted every K OFDM symbols is utilized. In this context, to combat inter-carrier and inter-symbol interference along with multiple access interference, new pre-equalization schemes for both downlink and uplink are introduced; for downlink, a multiple transmit antenna configuration is also considered. Results of computer simulations show that the proposed pre-equalization techniques are very effective with respect to other pre or post-equalization solutions and furthermore they can trade performance and bandwidth efficiency against complexity.