A Performance Analysis of Coded Frequency - Hopped OFDMA with Pilot-Assisted Channel Estimation

Author

Stamatiou, Kostas ; Proakis, John G.

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA

Volume

1

fYear

2005

fDate

11-14 Sept. 2005

Firstpage

362

Lastpage

366

Abstract

We investigate the performance of frequency-hopped OFDMA (FH-OFDMA), where subcarriers are assigned to users according to predetermined hopping patterns. Some of the patterns carry pilot symbols, which the users track to estimate their channel and perform coherent detection. We develop a simple theoretical framework in order to evaluate the bit error probability (BEP) over each data pattern, when trellis-coded modulation (TCM) is employed for error protection. Our analytical results illustrate that appropriately constructing the patterns, given the channel parameters, can have a significant effect on the performance experienced by different users of this OFDMA system. An intuitively pleasing trade-off between channel estimation quality and performance enhancement due to frequency diversity is also revealed, as the channel becomes more frequency selective

Keywords

channel estimation; diversity reception; error statistics; frequency division multiple access; trellis coded modulation; TCM; bit error probability; coded frequency-hopped OFDMA; frequency diversity; pilot-assisted channel estimation; trellis-coded modulation; Channel estimation; Error probability; Fading; Frequency conversion; Frequency diversity; Frequency estimation; Pattern analysis; Performance analysis; Protection; Robustness;

fLanguage

English

Publisher

ieee

Conference_Titel

Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on

Conference_Location

Berlin

Print_ISBN

9.7838007291e+012

Type

conf

DOI

10.1109/PIMRC.2005.1651459

Filename

1651459