FREQUENCY OFFSET COMPENSATION AND BURST DESIGN IN FREQUENCY FLAT FADING CHANNELS

Capability to combat channel fading and easy implementation have made the pilot symbol assisted modulation (PSAM) of practical interest in mobile communications. However, the operation in burst mode for multiple access purpose has sitill been a missing part from previous research. This work first examines the burst design problem associated with pilot symbol allocation in a frequency flat fading environment. Explicit relationship between error performance and the design parameters including pilot distribution, frequency offset, Doppler spread, and modulation scheme is exploreti. A new unequal spacing pilot insertion burst architecture is proposed to achieve better error performance. Frequency offset compensation in PSAM is another major investigation in this work. In a mobile fading environment, conventional frequency tracking loops suffer losttrack or false lock frequently. Recent research has tried on using the consistent phase error in the correlations of pilots to estimate the frequency offset. However, the optimal frequency offset estimation in mobile fading channels is still absent from previous reports and is a major focus of this work. Frequency offset estimators with high performance and reduced complexity are studied. This work also focuses on the performance improvement of a frequency offset estimator and a Doppler spread estimator. The performance degradation investigated can be used to determine the specification of the frequency offset estimator and Doppler spread estimator used in PSAM. Implementing EL high performance frequency offset estimator in a fading-channel receiver can significantly relieve the specification of the local oscillator and significantly improve the error performance and throughput rate.

[1]  P. Ho,et al.  Error performance of multiple symbol differential detection of PSK signals transmitted over correlated Rayleigh fading channels , 1991, ICC 91 International Conference on Communications Conference Record.

[2]  Hiroshi Suzuki,et al.  Fast carrier-tracking coherent detection with dual-mode carrier recovery circuit for digital land mobile radio transmission , 1989, IEEE J. Sel. Areas Commun..

[3]  Francis D. Natali,et al.  AFC Tracking Algorithms , 1984, IEEE Trans. Commun..

[4]  W. C. Jakes,et al.  Microwave Mobile Communications , 1974 .

[5]  S. N. Crozier,et al.  Reduced complexity short-block data detection techniques for fading time-dispersive channels , 1991, [1991 Proceedings] 41st IEEE Vehicular Technology Conference.

[6]  William C. Y. Lee,et al.  Mobile Communications Engineering , 1982 .

[7]  Seymour Stein,et al.  Unified analysis of certain coherent and noncoherent binary communications systems , 1964, IEEE Trans. Inf. Theory.

[8]  Thomas Alberty,et al.  A new pattern jitter free frequency error detector , 1989, IEEE Trans. Commun..

[9]  James K. Cavers,et al.  Cochannel interference and pilot symbol assisted modulation , 1993 .

[10]  Michael P. Fitz,et al.  Further results in the fast estimation of a single frequency , 1994, IEEE Trans. Commun..

[11]  Sandro Bellini,et al.  Digital frequency estimation in burst mode QPSK transmission , 1990, IEEE Trans. Commun..

[12]  Dariush Divsalar,et al.  Multiple-symbol differential detection of MPSK , 1990, IEEE Trans. Commun..

[13]  James K. Cavers,et al.  Analysis of the error performance of trellis-coded modulations in Rayleigh-fading channels , 1992, IEEE Trans. Commun..

[14]  Heinrich Meyr,et al.  A systematic approach to carrier recovery and detection of digitally phase modulated signals of fading channels , 1989, IEEE Trans. Commun..

[15]  Gerd Ascheid,et al.  Adaptive synchronization and channel parameter estimation using an extended Kalman filter , 1989, IEEE Trans. Commun..

[16]  John H. Lodge,et al.  TCMP-a modulation and coding strategy for Rician fading channels , 1989, IEEE J. Sel. Areas Commun..

[17]  M. P. Fitz.  A dual-tone reference digital demodulator for mobile digital communication , 1993 .

[18]  Michael P. Fitz,et al.  On the bit error probability of QAM modulation , 1994, Int. J. Wirel. Inf. Networks.

[19]  Gerd Ascheid,et al.  A new method for phase synchronization and automatic gain control of linearly modulated signals on frequency-flat fading channels , 1991, IEEE Trans. Commun..

[20]  S. N. Crozier,et al.  Reduced complexity short-block data detection techniques for fading time-dispersive channels , 1992 .

[21]  Of references. , 1966, JAMA.

[22]  F. Davarian,et al.  Mobile digital communications via tone calibration , 1987, IEEE Transactions on Vehicular Technology.

[23]  H. Meyr,et al.  Maximum likelihood open loop carrier synchronizer for digital radio , 1993, Proceedings of ICC '93 - IEEE International Conference on Communications.

[24]  Nelson Sollenberger,et al.  Burst coherent demodulation with combined symbol timing, frequency offset estimation, and diversity selection , 1991, IEEE Trans. Commun..

[25]  Steven Kay,et al.  A Fast and Accurate Single Frequency Estimator , 2022 .

[26]  Andrew J. Viterbi,et al.  Nonlinear estimation of PSK-modulated carrier phase with application to burst digital transmission , 1983, IEEE Trans. Inf. Theory.

[27]  A. Gualtierotti.  H. L. Van Trees, Detection, Estimation, and Modulation Theory, , 1976 .

[28]  William F. McGee,et al.  Complex Gaussian noise moments , 1971, IEEE Trans. Inf. Theory.

[29]  J.E. Mazo,et al.  Digital communications , 1985, Proceedings of the IEEE.

[30]  J. Cavers.  Performance of tone calibration with frequency offset and imperfect pilot filter (mobile radio) , 1991 .

[31]  H. O. Posten.  Multidimensional Gaussian Distributions , 1964 .

[32]  W. Weber,et al.  Performance of Phase-Locked Loops in the Presence of Fading Communication Channels , 1976, IEEE Trans. Commun..