Decision feedback demodulator with phase and frequency estimatio

Details Decision feedback demodulator with phase and frequency estimatio Decision feedback demodulator with phase and frequency estimatio

1993-12-06

1996-03-05

Chin, Stephen

Pulse or digital communications

Receivers

Angle modulation

375326, 375376, 375377, 455334, 327233, 327 39, H04L 2714, H04L 2716, H04L 2722

Patent

active

054974003

ABSTRACT:
A data communication receiver (10) uses a decision feedback demodulator (32) to remove data from a received signal. Quadrature components of the received signal define a received phase. The received phase is rotated (46) by an amount predicted to compensate for phase and frequency errors. After this rotation, a decision circuit (52) determines the modulation phase for a current symbol. A phase rotator (64) compares the modulation phase with the received phase to generate a measured phase error for the symbol. This measured phase error and measured phase errors from past symbols are averaged in a combination circuit (80) to produce a phase estimate. The past measured phase errors are also processed to determine the amount of change in measured phase error that has occurred over a number of symbols. This processing yields a frequency estimate. A phase rotator (94) merges the frequency and phase estimates for use in compensating a current received phase.

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"Maximum Likelihood Carrier Phase Recovery for Linear Suppressed-Carrier Digital Data Modulations" by Pooi Yuen Kam, Member IEEE, from IEEE Transactions on Communications, vol. Comm-34, Jun. 6, 1986.
"Low-Overhead Symbol Timing and Carrier Recovery for TDMA Portable Radio Systems" by Nelson R. Sollenberger, Senior Member, IEEE and Justing C.-I. Chuang, Senior Member, IEEE, from IEEE Transactions on Communications, vol. 38, No. 10, Oct. 1990.

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