Title :
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
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;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2005. PIMRC 2005. IEEE 16th International Symposium on
Conference_Location :
Berlin
Print_ISBN :
9.7838007291e+012
DOI :
10.1109/PIMRC.2005.1651459
