Apparatus and methods for signal recovery in a digital communica

Details Apparatus and methods for signal recovery in a digital communica Apparatus and methods for signal recovery in a digital communica

1995-10-27

1998-11-24

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

341 43, H03D 100

Patent

active

058418172

ABSTRACT:
The present invention provides an apparatus and method for signal recovery from noisy observation in digital communication systems, utilizing a forward estimator and data smoother which improves the quality of the estimates of the transmitted signal. The present invention also provides an apparatus and method for the application of the forward estimator to the recovery of a digital data stream modulated with a CPM waveform, through the use of a receiver for GMSK demodulation. The digital data is first processed using the Forward Estimation process which calculates the probability that a symbol is in particular states. Bit decision is then applied, followed by scaling. The present invention further provides an apparatus and method for the application of the forward estimator and data smoother to the decoding of digital data which has been encoded with a Convolutional code. The digital data is first processed using the Forward Estimation procedure and then smoothed and scaled. Bit decision is then applied.

REFERENCES:
patent: 4750192 (1988-06-01), Dzung
patent: 5014283 (1991-05-01), Baier
patent: 5311523 (1994-05-01), Serizawa et al.
M. Kent, D.D. Sworder, and R.J. Elliott, "GMSK for Mobile Communication," Proc. of the 28th Asilomar Conf. on Signals, Systems, and Computers (Monterey CA, Nov. 1994), IEEE Service Center, Piscataway, NJ., pp. 455-459.
Robert J. Elliott, "A General Recursive Discrete Time Filter," J. of Applied Probability, vol. 30, No. 3, Sep. 1993, pp. 575-588.
Robert J. Elliott, "Exact Adaptive Filters for Markov Chains Observed in Gaussian Noise," Automatica, vol. 30, 1994, pp. 1-10.

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