Abstract:
|
In this paper, we address the problem of user
scheduling in downlink coordinated multi-point transmission
(CoMP) systems, where multiple users are selected and then
served with zero forcing beamformer simultaneously by several
cooperative base stations (BSs). To reduce the enormous overhead
led by obtaining full channel state information at the transmitter,
a low-feedback user scheduling method called channel normbased
user scheduler (NUS), is proposed by exploiting the
asymmetric channel feature of CoMP systems. Simulation results
show that the channel norm provides sufficient information
for user scheduling when each BS has one antenna, where
the performance gap between the NUS and the greedy user
selection (GUS) is negligible with respect to both the cell average
throughput and the cell edge throughput. When each BS has
multiple antennas, NUS is inferior to GUS, but still significantly
outperforms the uncoordinated systems. |