Unitary beamforming under constant modulus constraint in MIMO broadcast channels

In this section, we evaluate the performance of the proposed algorithms through simulations, for M = 2 transmit anten- nas, and we compare their sum rate with three

Thus, the above result implies that, for large K, the sum rate of a system using an efficient user selection algorithm and beamforming based on these scalar feedback metrics

In the last part of this paper, the proposed technique is investigated in MIMO broadcast channels with multiuser scheduling, evaluating the performance of unitary beamforming

We show that by using MU-BF at the source node and a maximum number of relay nodes selected for cooperation, the network gains from multiplexing, while beyond that number of

The feedback conveyed by each user to the base station consists of channel direction information (CDI) based on a predetermined codebook and a scalar metric with channel

This framework is used for channel direction quantization in [12], where feedback to the base station consists of a quantization index along with a channel quality indicator for

Under this setup, we adopt two different approaches to distributed coordinated beamforming, a first approach presented for the MISO case solely, and another more general approach

Continuing with the symmetric single tier scenario above with a sin- gle stream/user and fixed receivers in cluster edge cells, the CSIT re- quired is only global for the cluster