Title :
Throughput maximization of adaptive MQAM and the effects of inaccurate feedback channel estimation
Author :
Xie, Junsong ; Fan, Pingzhi
Author_Institution :
Inst. of Mobile Commun., Southwest Jiaotong Univ., Chengdu, China
Abstract :
Based on the analysis of system throughput with fixed modulation for packet transmission in Rayleigh fading environment, optimal channel signal to noise ratio (SNR) switching thresholds for adaptive modulation with maximized throughput are obtained by assuming ideal feedback channel estimation. Significant throughput improvement is achieved and the packet size is shown to have strong effect on throughput performance. Next, based on the Gaussian distributed and uniformly distributed models of channel estimation error, throughput performance of adaptive MQAM with inaccurate feedback channel estimation is investigated. Results obtained show that throughput of the adaptive system is quite sensitive to channel estimation error when the metric of estimation error is larger than 3 dB.
Keywords :
Rayleigh channels; adaptive modulation; channel estimation; fading channels; feedback; quadrature amplitude modulation; Gaussian distributed model; Rayleigh fading; adaptive M-ary quadrature amplitude modulation; channel estimation error; inaccurate feedback channel estimation; link adaptation; optimal signal to noise ratio switching thresholds; packet size; packet transmission; system throughput maximization; throughput performance; uniformly distributed model; Adaptive systems; Bit error rate; Channel estimation; Delay estimation; Estimation error; Feedback; Quadrature amplitude modulation; Rayleigh channels; Signal to noise ratio; Throughput;
Conference_Titel :
Parallel and Distributed Computing, Applications and Technologies, 2003. PDCAT'2003. Proceedings of the Fourth International Conference on
Print_ISBN :
0-7803-7840-7
DOI :
10.1109/PDCAT.2003.1236333
