Frequency and time slot synchronizaton using adaptive filtering

Details Frequency and time slot synchronizaton using adaptive filtering Frequency and time slot synchronizaton using adaptive filtering

1992-11-02

1993-08-31

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Single message via plural carrier wave transmission

455 71, 455 75, 455265, 375 97, 370 953, H04B 701, H04B 140, H04L 2706, H04J 316

Patent

active

052416887

ABSTRACT:
The synchronization process of the present invention filters the received signal with an adaptive band-pass filter (101) while buffering the received signal in memory (108). The energies of the input signal and the filtered signal are estimated (103 and 104) and the gain of the filter is adapted (105) based on the difference between the energies. The pole of the filter is adapted (102) to center the frequency of the input signal in the filter's pass-band. If a tone is detected (106), the length of the tone is determined (107) to ascertain if it is a frequency correction burst (FCB). If the tone detected is an FCB, the signal in the memory is also the FCB that is then filtered in the band-pass filter (101) and the difference between the frequency of this signal and 67.5 kHz is determined (109). This difference represents the frequency offset between the base station carrier frequency and that of the mobile radiotelephone, and can be fed into the local oscillating means to compensate for the frequency offset. The boundaries of the FCB establish the time slot alignment of the TDMA structure being received from the base station.

REFERENCES:
patent: 4371220 (1982-02-01), Martin
patent: 4466130 (1984-08-01), Severinson
patent: 4977580 (1990-12-01), McWicol
patent: 5081652 (1992-01-01), Farahati et al.

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