An Efficient Signaling for Multi-mode Transmission in Multi-user MIMO
Paper in proceedings, 2010
In this paper the downlink of a multi-user MIMO (MUMIMO)
system with multi-mode transmission is considered.
We propose a low-complexity algorithm for selecting users
and the corresponding number of data streams to each user,
denoted as user transmission mode (UTM). The selection
is only based on the average received signal-to-noise ratio
(SNR) from the base station (BS) for each user. This reduces
the overall amount of feedback for scheduling, as opposed
to techniques that assume perfect instantaneous channel
state information (CSI) from all users. Analytical average
throughput approximations are derived for each user at different UTMs. Simulation results demonstrate that the proposed algorithm provides performance close to dirty paper coding (DPC) with considerably reduced feedback.