Title :
Performance of Bayesian Estimation Based Variable Rate Variable Power MQAM System
Author :
Ong, L.T. ; Lambotharan, S. ; Chambers, J.A. ; Shikh-Bahaei, M.
Author_Institution :
Centre of Digital Signal Process., Cardiff Univ.
Abstract :
In this paper, we generalize the algorithms of our previously proposed Bayesian estimation based variable rate variable power multilevel quadrature amplitude modulation (VRVP-MQAM) system to incorporate for the first time a maximum a posteriori (MAP) channel predictor and a MQAM scheme adopted with practical constellation sizes. Based on a pilot symbol assisted modulation (PSAM) scheme, we evaluate the performance of our proposed VRVP-MQAM system over a Rayleigh flat-fading channel. We demonstrate in our simulation results that the proposed rate and power algorithms that are derived based on a Bayesian bit error rate (BER) estimation and the second order statistical characterization of the channel state information (CSI) outperforms in terms of spectral efficiency and average BER. This improvement is confirmed by comparison with an alternative rate and power algorithm which exploits an ideal CSI assumption
Keywords :
Bayes methods; Rayleigh channels; error statistics; maximum likelihood estimation; quadrature amplitude modulation; BER; Bayesian bit error rate; Bayesian estimation; MAP; Rayleigh flat-fading channel; channel state information; maximum a posteriori channel predictor; pilot symbol assisted modulation; second order statistical characterization; variable rate variable power MQAM system; Amplitude estimation; Bayesian methods; Bit error rate; Channel state information; Delay estimation; Estimation error; Feedback; Performance analysis; Signal processing algorithms; State estimation;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2006 IEEE 17th International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
1-4244-0329-4
Electronic_ISBN :
1-4244-0330-8
DOI :
10.1109/PIMRC.2006.254452
