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http://dx.doi.org/10.7236/JIIBC.2014.14.1.1

An Enhanced Scheme with CFO and SFO in OFDMA system  

Lee, Young-Gwang (Dept. of Electronic & Electrical Engineering, Hongik University)
Lee, Kyu-Seop (Dept. of Electronic & Electrical Engineering, Hongik University)
Choi, Gin-Kyu (Dept. of Electronic & Electrical Engineering, Hongik University)
Publication Information
The Journal of the Institute of Internet, Broadcasting and Communication / v.14, no.1, 2014 , pp. 1-6 More about this Journal
Abstract
Recently, orthogonal frequency-division multiplexing(OFDM), with clusters of subcarriers allocated to different subscribers(often referred to as OFDMA), has gained much attention for its ability in enabling multiple-access wireless multimedia communications. In such systems, carrier frequency offsets (CFOs) can destroy the orthogonality among subcarriers. And the mismatch in sampling frequencies between transmitter and receiver can lead to serious degradation due to the loss of orthogonality between the subcarriers. As a result, multiuser interference (MUI) along with significant performance degradation can be induced. In this paper, we present a scheme to compensate for the SFOs and CFOs at the base station of an OFDMA system. A novel sampling frequency offset estimation algorithm is proposed, which is based on the repetition of a symbol at the communication start-up. Then, circular convolutions are employed to generate the interference after the discrete Fourier transform processing, which is then removed from the original received signal to increase the signal to interference power ratio(SIR). Simulation result shows that the proposed scheme can improve system performance.
Keywords
OFDM; OFDMA; CFO; SFO; MUI;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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