Title :
Channel Norm-Based User Scheduler in Coordinated Multi-Point Systems
Author :
Han, Shengqian ; Yang, Chenyang ; Bengtsson, Mats ; Pérez-Neira, Ana I.
Author_Institution :
Beihang Univ., Beijing, China
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 norm-based 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.
Keywords :
antenna arrays; array signal processing; cellular radio; radiofrequency interference; scheduling; CoMP systems; asymmetric channel feature; cell average throughput; cell edge throughput; cellular networks; channel norm-based user scheduler; channel state information; cooperative base stations; coordinated multipoint systems; downlink coordinated multipoint transmission systems; greedy user selection; intercell interference; low-feedback user scheduling method; multiple antennas; transmitter; zero forcing beamformer; Array signal processing; Base stations; Channel state information; Downlink; Feedback; Interference; MIMO; System performance; Throughput; Transmitters;
Conference_Titel :
Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-4148-8
DOI :
10.1109/GLOCOM.2009.5425711