Frequency-domain detection of OQPSK signals with quasi-constant envelope and high spectral efficiency

  • Authors:

  • Marco Serrazina;Rui Dinis;Paulo Carvalho

  • Affiliations:

  • Vodafone, Lisbon, Portugal;IST, Lisbon, Portugal;FCT, Monte da Caparica, Portugal

  • Venue:
  • IWCMC '07 Proceedings of the 2007 international conference on Wireless communications and mobile computing
  • Year:
  • 2007

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Abstract

In this paper, we consider SC-FDE schemes (Single Carrier with Frequency-Domain Equalization) employing OQPSK (Offset Quaternary Phase Shift Keying) signals with quasi-constant envelope. To allow high spectral efficiency, different frequency channels are separated by the symbol rate, regardless of their bandwidth (which is much higher than the symbol rate for quasi-constant envelope OQPSK signals), and we consider a multi-channel frequency-domain receiver with ACI (Adjacent Channel Interference) suppression. Our performance results show that it is possible to have high spectral efficiency with quasi-constant envelope OQPSK signals. This technique is especially interesting for the uplink of future broadband wireless systems since we can employ low-cost, grossly nonlinear power amplifiers at the mobile terminals and almost all signal processing is shifted to the base station.