Abstract
This seminar considers wireless broadcast systems with multi-antennas at base station and multiple users in the system. A typical wireless system usually has more users than the number of antennas at the base station. In this situation base station can not communicate to all users simultaneously. Therefore, base station has to select a set of users from all active users for communication. This selection process is known as user scheduling or user selection. We have discussed three practical user selection schemes in this talk. Once base station decides which users to serve, next step is to assign transmit antennas to each user. In traditional systems, base station selects a transmit antenna or a subset of transmit antennas for each user based on certain channel information from each user. We have proposed a new decentralized antenna selection scheme where each user selects a subset of transmit antennas for itself and sends this information back to the base station. This novel antenna selection approach reduces the interference among multiple users and increases the system throughput. We have analysed the performance of this approach with minimum mean square error (MMSE) and zero forcing (ZF) linear receivers. It is shown that the proposed scheme works better with both receivers.
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