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Conference Paper
Channel Compensation of Variable Symbol Timing Offset in Non-synchronized OFDM System
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- Authors
- Jae-Ho Lee, Dong-Joon Choi, Nam-Ho Hur, Whan-Woo Kim
- Issue Date
- 2013-06
- Citation
- International Conference on Future Information and Communication Engineering (ICFICE) 2013 (LNEE 235), v.235, pp.73-79
- Publisher
- Springer
- Language
- English
- Type
- Conference Paper
- Abstract
- In this paper, we propose the method of channel compensation with phase rotator (PR) when there is variable symbol timing offset (STO) in non-synchronized orthogonal frequency division multiplexing (OFDM) system. Because the symbol timing of OFDM symbols is estimated within cyclic prefix (CP) interval, a STO occurs and makes the received quadrature amplitude modulation (QAM) symbols rotated. These rotated QAM symbols can be compensated with frequency domain equalizer (FEQ). However, because the drift of symbol timing occurs in non-synchronized OFDM system, symbol timing should be estimated every OFDM symbols. Thus, the STO of the first OFDM symbol can be different from it of other OFDM symbols. PR compensates the phase difference caused by STO differences of OFDM symbols before FEQ. We show that the uncoded-bit error rate (BER) between the synchronized OFDM system and the proposed non-synchronized OFDM system is the same under additive white Gaussian noise (AWGN) and multipath channel. © 2013 Springer Science+Business Media Dordrecht.
- KSP Keywords
- Additive white Gaussian noise(AWGN), Bit Error rate, Cyclic prefix(CP), Frequency domain(FD), Frequency domain Equalizer(FDE), Multipath channels, Orthogonal frequency division multiplexing (OFDM) system, Phase Difference, Quadrature Amplitude Modulation(QAM), channel compensation, phase rotator