Interference mitigation for downlink base station cooperation with joint distributed space-time coding

Capacity of a cellular system on the downlink is significantly limited by inter-cell interference (ICI), especially at the cell boundary. Multicell joint processing can mitigate inter-cell interference and thereby increase the spectral efficiency of cellular systems. In this paper, a joint distributed space-time coding (J-DSTC) and an inner J-DSTC base station cooperation scheme with precoding are proposed to remove the significant ICI experienced by the cell boundary users. Simulation results show that the proposed scheme can effectively suppress the inter-cell interference, and achieve more diversity gain compared to that without cooperation and is more spectrally efficient than that of no cooperation and BSs transmitting in a time-division multiple access manner to avoid ICI at the cell edge, while retains a comparatively low structural and computational complexity.