Multiuser diversity in correlated Rayleigh-fading channels

Abstract

This article studies the effect of scheduling and multiuser diversity on the performance of correlated Rayleighfading channels. More specifically, the power-limited channel average rate is obtained for quasi-static correlated fading channels. The results are obtained in the cases where there is perfect or imperfect channel state information available at the transmitter. Simulation results show that the average rate reduction due to channels dependencies is ignorable in low correlation conditions. However, the effect of scheduling and multiuser diversity on the average rate reduces substantially as the fading channels dependency increases. Also, for different channels correlation conditions, considerable performance improvement is achieved via very limited number of feedback bits.

Queueing analysis of opportunistic scheduling with spatially correlated channels

“…The discussion how much feedback is sufficient in order to benefit from the MU diversity is actively investigated [13,14]. Furthermore, the gain of opportunistic scheduling may suffer from cross-channel correlations between users [15]. Typically the wireless networks exploiting MU diversity achieve the maximum performance in case of independent channels, positive cross-correlation leading to a decrease of the overall transmission capacity [16,17].…”

Low complexity precoding codebook design based on DFRST for limited feedback precoded OSTBC systems

“…This precoding technique for the MIMO system can improve the system performance significantly by using the channel state information (CSI) [11][12][13][14] at the transmitter. This system model with limited feedback studied by Love and Heath in [7] has been adopted in many communication systems, such as the Long Term Evolution (LTE) [1][2][3][4] and spatial modulation [15,16].…”