Author :
Luise, Marco ; Reggiannini, Ruggero ; Vitetta, Giorgio M.
Abstract :
A novel equalization/detection algorithm for orthogonal frequency division multiplexing (OFDM) signals transmitted over frequency-selective channels is introduced and investigated. The algorithm stems from the recognition that the Fourier transform processing inherent in OFDM turns a single wideband frequency-selective channel into a set of correlated narrowband frequency-flat fading channels. This suggests that sequence detection techniques, such as those discussed by Vitetta et al. (see IEEE Trans. Commun., vol.43, p.2750-8, 1995, IEEE Trans. Commun., vol.43, pt.II, p.1256-9, 1995, and Proc. IEEE Commun. Theory Mini-Conf (Globecom ´96), London, UK, p.153-7, 1996), for time-selective flat-fading channels, can be also profitably utilized for joint equalization and decoding of OFDM signals in the frequency domain. Simulation results show that the proposed detection strategy, implemented via a standard Viterbi algorithm, provides improved performance over differential detection, with a moderate increase in receiver complexity and without requiring the periodic transmission of training blocks
Keywords :
Fourier transforms; OFDM modulation; Viterbi detection; blind equalisers; decoding; fading channels; frequency-domain analysis; multipath channels; phase shift keying; sequences; Fourier transform processing; OFDM signals; PSK signals; Viterbi algorithm; blind detection; blind equalization; correlated narrowband frequency-flat fading channels; decoding; differential detection; equalization/detection algorithm; frequency domain; joint equalization; multipath fading; orthogonal frequency division multiplexing; receiver complexity; sequence detection; simulation results; time-selective flat-fading channels; wideband frequency-selective channel; Blind equalizers; Decoding; Detection algorithms; Fading; Fourier transforms; Frequency domain analysis; Narrowband; OFDM; Signal detection; Wideband;
