Title :
Resource Allocation in OFDMA Networks With Imperfect Channel State Information
Author :
Zhuwei Wang ; Lihan Liu ; Xiaodong Wang ; Jing Zhang
Author_Institution :
Electr. Eng. Dept., Columbia Univ., New York, NY, USA
Abstract :
This letter investigates the effect of imperfect channel state information (CSI) on the performance of radio resource management for a downlink multi-user OFDMA system. It is shown that the imperfect CSI introduces a signal-and-power dependent noise term, which makes the symbol error rate (SER) constellation-point dependent, and yields an error floor on the SER. In addition, a two-step multi-user channel, power and constellation allocation algorithm is proposed to maximize the total network throughput.
Keywords :
OFDM modulation; channel allocation; CSI; OFDMA networks; SER; downlink multiuser OFDMA system; imperfect channel state information; radio resource management; resource allocation; signal-and-power dependent noise term; symbol error rate; total network throughput; two-step multi-user channel power and constellation allocation algorithm; Channel estimation; Downlink; Optimization; Resource management; Signal to noise ratio; Throughput; Imperfect CSI; OFDMA; channel assignment; power control; throughput;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2014.2340872
