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Frequency-Domain Parallel Multiuser Detection for Quasi-Constant Envelope OQPSK Schemes with High Spectral Efficiency

Luzio, M. ; Dinis, R. ; Montezuma, P. M.

Frequency-Domain Parallel Multiuser Detection for Quasi-Constant Envelope OQPSK Schemes with High Spectral Efficiency, Proc International Conf. on Signal Processing and Communication Systems - ICSPCS, Omaha, United States, Vol. I, pp. 1 - 7, September, 2009.

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Abstract
In this paper we consider a FDMA (Frequency Division Multiple Access) system employing OQPSK modulations (Offset Quaternary Phase Shift Key- ing) with quasi-constant envelope. To increase the over- all spectral efficiency we consider spectral overlapping between different frequency channels. We present an iterative frequency-domain receiver with parallel multiuser detection.
Our performance results show that our receiver is able to cope with the strong ACI levels (Adjacent Channel Interference) inherent to spectral overlapping, as well as with the interference between the in-phase (I) and quadrature (Q) components of the OQPSK signals, even for severely time-dispersive channels.