"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 9, 2016

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L. E. Nazarov 1, A. S. Zudilin 2

1 Kotel’nikov Institute of Radio-Engineering and Electronics of RAS, Fryazino

2 JSC Academician M.F.Reshetnev “Information Satellite Systems”, Zheleznogorsk

The paper is received on September 9, 2016

Abstract. Orthogonal frequency division multiplexing (OFDM) is popular technique in broadband wireless communications due to its advantage to combat channel multi-path and to provide high spectral efficiency. The drawback of OFDM systems is its high sensitivity to synchronization non idealities between the transmitter and receiver oscillators. Specifically incorrect timing synchronization can cause interference between successive symbols and can lead to a severe performance degradation. In addition, a carrier-frequency offset induces an amplitude reduction of the useful signal and provokes interference between adjacent subcarriers. In this paper the problem synchronization in OFDM systems (the detection, symbol timing and carrier-frequency evaluation) is examined and new algorithms of OFDM signal-preamble detection are proposed. The base of these algorithms is recursive sliding discrete Fourier transform that is more efficient that usage of Fast Fourier Transform.

Key words: OFDM signals, synchronization, error performance of detection,  FFT, recursive sliding discrete transform.


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