Title :
On pilot-assisted MAP detection in frequency-flat Rayleigh fading channels
Author :
Sgraja, Christian ; Egle, Jochem ; Lindner, Jurgen
Author_Institution :
Dept. of Inf. Technol., Ulm Univ., Germany
Abstract :
Pilot symbol assisted modulation (PSAM) eases the task of estimating the channel gain and phase in frequency-flat Rayleigh fading. Inaccurate channel estimates may lead to an increased error probability in a subsequent data detection stage. For PSAM and flat Rayleigh fading, the effects of channel estimation errors on the error probability have been analyzed in A. Aghamohammadi and H. Meyr [Nov. 1990]. We pursue the analysis given in A. Aghamohammadi and H. Meyr [Nov. 1990] and derive the maximum a-posteriori (MAP) detector which minimizes the symbol error probability by processing the data and pilot receive symbol(s) simultaneously. This detector is compared to the conventional 2 step receiver which performs channel estimation followed by data detection. Moreover, a basic approach to calculate the symbol error probability is given and we study and illustrate the decision regions of the two detectors.
Keywords :
Rayleigh channels; channel estimation; error statistics; maximum likelihood detection; modulation; PSAM; channel estimates; channel gain; channel phase; data detection; error probability; frequency flat Rayleigh fading channels; pilot assisted MAP detection; pilot symbol assisted modulation; Channel estimation; Detectors; Error probability; Fading; Frequency estimation; Maximum a posteriori estimation; Notice of Violation; Phase estimation; Phase modulation; Rayleigh channels;
Conference_Titel :
Wireless Communications and Networking, 2003. WCNC 2003. 2003 IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-7700-1
DOI :
10.1109/WCNC.2003.1200496
