BEAMFORMING AND POWER ALLOCATION TECHNIQUES FOR MULTIUSER MIMO BROADCAST CHANNELS

Abstract : The sum rate maximization in multiuser MIMO broadcast channels is investigated in this thesis. Firstly, we give an overview of the state of the art of the different beamforming techniques in the literature, and a new beamforming method under total power constraint is proposed. Secondly, considering that the power of each antenna is limited individually by the linearity of its power amplifier in practice, we impose a more realistic per-antenna power constraint to optimize the sum rate. It can be seen that the original problem is difficult to solve. Then in this thesis, this problem is divided into two classical subproblems, one of which becomes a semidefinite programming (SDP) problem, and the other one can be solved by the maximal-ratio combining (MRC) technique. Compared with the methods in the literature, a better sum rate performance is achieved. Moreover, the proposed method works even if the number of total receive antennas is larger than that of the transmit antennas. Thirdly, if the interference is not removed completely in multiuser MIMO broadcast channels, power allocation becomes a NP hard problem. In this thesis, an efficient suboptimal power allocation method is proposed to maximize the sum rate. Compared with the methods in the literature, the computational complexity is substantially reduced, and the performance is close to the optimal value.
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Lei Zhao. BEAMFORMING AND POWER ALLOCATION TECHNIQUES FOR MULTIUSER MIMO BROADCAST CHANNELS. Engineering Sciences [physics]. UNIVERSITE DE NANTES, 2014. English. ⟨tel-01104818⟩

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