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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.

REFERENCES

• 1: A. Gusmão, R. Dinis, J. Conceição, and N. Esteves, "Comparison of Two Modulation Choices for Broadband Wireless Communications", IEEE VTC'00 Spring, May 2000.
• 2: D. Falconer, S. Ariyavisitakul, A. Benyamin-Seeyar and B. Eidson, "Frequency Domain Equalization for Single-Carrier Broadband Wireless Systems", IEEE Comm. Mag., Vol. 4, No. 4, pp. 58--66, April 2002.
• 3: R. Dinis, D. Falconer and B. Ng, "Iterative Frequency-Domain Equalizers for Adjacent Channel Interference Suppression", IEEE GLOBECOM'05, Dec. 2005.
• 4: W. Gardner, Introduction o Random Processes with Applications to Signals and Systems, McGraw-Hill, 1990.
• 5: W. Gardner, "Exploitation of Spectral Redundancy in Cyclostationary Signals", IEEE Comm. Mag., Vol. 8, No. 2, pp. 14--36, Apr. 1991.
• 6: B. Petersen and D. Falconer, "Suppression of Adjacent Channel, Co-channel, and Intersymbol Interference by Equalizers and Linear Combiners", IEEE Trans. on Comm., Vol. 42, No. 12, pp. 3109--3118, Dec. 1994.
• 7: A. Gusmão, P. Torres, R. Dinis and N. Esteves, "A Class of Iterative FDE Techniques for Reduced-CP SC-Based Block Transmission", Int. Symposium on Turbo Codes, April 2006.
• 8: ETSI, "Channel models for HIPERLAN/2 in Different Indoor Scenarios", ETSI EP BRAN 3ERI085B, pp. 1--8, March 1998.

INDEX TERMS

Primary Classification:
  H. Information Systems
  H.4 INFORMATION SYSTEMS APPLICATIONS
      H.4.3 Communications Applications

Additional Classification:
  H. Information Systems
  H.1 MODELS AND PRINCIPLES
      H.1.1 Systems and Information Theory
          Subjects: General systems theory

General Terms:
Algorithms, Design, Performance

Keywords:
ACI, ACI suppression, OQPSK, OQPSK signals, frequency domain equalization, frequency-domain equalization, interference cancellation, multiuser detection