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

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Stamatiou, Kostas; Proakis, John G. (Department of Electrical & Computer Engineering, University of California San Diego, La Jolla, CA 92093-0407, USA)

We investigate the performance of frequencyhopped 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 trelliscoded 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.