Jointly distributed transceiver design for multicell systems with low complexity

Abstract

This paper studies the jointly distributed transceiver design for time-division-duplex (TDD) multicell downlink systems where there is no exchange information between the Base Stations (BSs). With an aim to minimize the sum MSE under per-BS power constraint, we give a hierarchical iterative algorithm which can be implemented in a distributed manner with low complexity. The algorithm is described as follows. First, with given precoders, the equalizers are updated by MMSE method. Second, by keeping the equalizers fixed, the original problem is convex in precoders and the precoders can be solved with the aid of KKT conditions. Finally, repeat the above steps until the algorithm converges. The proof of the convergence and the analysis of the complexity are given as well. Simulation results show that the proposed algorithm is converged within few iterations and outperforms the existing distributed algorithms.