Fast automatic gain control

Details Fast automatic gain control Fast automatic gain control

1994-09-14

1996-10-22

Tse, Young T.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

375345, H04L 2706

Patent

active

055685188

ABSTRACT:
A method for demodulating or decoding a digitally modulated data signal is disclosed wherein AGC parameters are retain and update or discard in parallel with deciding the data patterns most likely to have been transmitted. First, the received signals are converted from analog to digital to obtain numerical signal samples. The numerical signal samples are then compared with sample values expected for each of a number of possible symbol sequences using a scaling factor associated with each of the symbol sequences in order to determine a mismatch value for each sequence. The mismatch values are then logically self-consistent. Then, the lowest cumulative mismatch value is chosen from among all the foregoing sequences that can logically precede a new sequence to be accumulated with the mismatch value from the new sequence, wherein the selected mismatch identifies a best predecessor sequence. The scaling factor associated with the best predecessor is then chosen and the scaling factor is updated to obtain the scaling factor to be associated with the new sequence.

REFERENCES:
patent: 5048059 (1991-09-01), Dent
patent: 5093848 (1992-03-01), Raith
patent: 5136616 (1992-08-01), Dent
patent: 5331666 (1994-07-01), Dent
patent: 5335250 (1994-08-01), Dent et al.
S. Sampei, "Development of Japanese Adaptive Equalizing Technology Toward High Bit Rate Data Transmission in Land Mobile Communications," The Transactions of the Institute of Electronics, Information and Comm. Engineers, vol. E74, No. 6, pp. 1512-1521, Jun. 1991.
K. Okanoue et al., "New MLSE Receiver Free from Sample Timing and Input Level Controls," Personal Communication--Freedom Through Wireless Technology, IEEE, Conf. 43, pp. 408-411, May 1993.

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