Method and circuitry for determining symbol timing for time divi

Details Method and circuitry for determining symbol timing for time divi Method and circuitry for determining symbol timing for time divi

1988-06-29

1989-07-18

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375106, H03D 302

Patent

active

048499919

ABSTRACT:
In order to correctly demodulate a received sequential burst of symbols in a Time Division Multiple Access (TDMA) radio system, proper symbol timing is necessary. A method and circuitry for estimating symbol timing is disclosed in which the IF radio signal is sampled and digitized at a sampling rate which is sixteen times the symbol rate. The digitized samples are processed to obtain phase values. A one symbol delay is introduced and differential phase values derived, a differential phase value being derived for each of the sixteen sampling times per symbol. The differential phase values are compared with expected differential phase values and the absolute differences are accumulated for each sampling time over substantially the entire burst. The symbol timing is selected to be the particular one-of-the-sixteen sampling times that results in the minimum sum of differences.

REFERENCES:
patent: 4715047 (1987-12-01), Hambley
patent: 4746872 (1988-05-01), Yamagata
patent: 4757266 (1988-07-01), Yoshida et al.
"Block Demodulation for Short Radio Packet", Electronics and Communications in Japan, vol. 67-B, No. 5, Junji Namiki, 1984.

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