An Enhanced Signal-Timing-Offset Compensation Algorithm for Coordinated Multipoint-to-Multiuser Systems

In coordinated multipoint-to-multiuser systems, since coordinated base stations (BSs) may transmit their signals simultaneously to multiple user equipments (UEs) and a UE may receive signals with different signal timing offsets (STOs) from different BSs at given time-slots and subcarriers, it is impossible for BSs to pre-compensate or for UEs to post-compensate the STOs as they do it in multipoint-to-user or point-to-multiuser systems, respectively. In this letter, we convince by demonstrations that the STOs cannot be completely eliminated by any compensation algorithm. In addition, we propose a novel STO compensation algorithm associated with tolerant residual STOs to minimize the STOs, and discuss in details how to calculate the pre-compensation vector at BSs. Simulation results indicate that the proposed algorithm is capable of mitigating the STOs effectively to tolerable values, and outperforms state of the art approaches.