Title :
Frequency offset compensation of pilot symbol assisted modulation in frequency flat fading
Author :
Kuo, Wen-Yi ; Fitz, Michael P.
Author_Institution :
Radio Technol. Performance Group, Lucent Technol., Whippany, NJ, USA
fDate :
11/1/1997 12:00:00 AM
Abstract :
Pilot symbol assisted modulation (PSAM) is a practical technique in mobile digital communications since it can provide high performance in fading with large constellations and it has a simple implementation. Maintaining high performance with PSAM requires an accurate estimate of the transmitted carrier frequency. This paper examines model-based frequency estimation for mobile digital communications with PSAM. Maximum-likelihood estimators (MLE), which include the model for the fading, are derived and compared with those in an additive white Gaussian noise (AWGN) channel, and performance hounds are computed. Reduced complexity frequency estimators based on the MLE are derived and the performance is quantified by Monte-Carlo simulation
Keywords :
Gaussian channels; Monte Carlo methods; Rayleigh channels; demodulation; digital radio; electromagnetic wave scattering; fading; frequency estimation; land mobile radio; maximum likelihood estimation; modulation; time-varying channels; AWGN channel; MLE; Monte-Carlo simulation; PSAM; Rayleigh channels; additive white Gaussian noise; coherent demodulation; frequency flat fading; frequency offset compensation; high performance; isotropic scattering; large constellations; maximum-likelihood estimators; mobile digital communications; model-based frequency estimation; performance bounds; pilot symbol assisted modulation; reduced complexity frequency estimators; time varying channnel; transmitted carrier frequency; AWGN; Additive white noise; Analytical models; Demodulation; Digital communication; Digital modulation; Fading; Frequency estimation; Frequency modulation; Maximum likelihood estimation;
Journal_Title :
Communications, IEEE Transactions on
