A Channel Estimation Technique for Uplink TDD MC-CDMA

In this paper, we address the problem of channel estimation in the uplink of TDD MC-CDMA with combined-equalization. Channel responses are estimated based on least-squares approach assuming that training blocks are periodically inserted into the uplink data stream. Compared to channel estimation approaches that are designed for conventional uplink MC-CDMA with post-equalization, the proposed scheme provides better performance in terms of mean-square channel estimation error and bit-error rate. Moreover, we investigate the impacts of channel variations and of energy boosting of the training blocks on the system performance