Pulse or digital communications – Repeaters – Testing
Patent
1988-06-29
1990-06-26
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
375 97, 329360, H03D 102
Patent
active
049378414
ABSTRACT:
Coherent phase recovery in a time division multiple access (TDMA) system can be attained in a novel manner. After symbol-timing and frequency-offset are estimated, the stored received phase at the desired sampling instant is gated from memory and fed to the input of the carrier phase recovery circuitry. During a first half portion of a burst, the first half portion of the burst is stored, while the loops acquire lock. The first half portion is then fed to one of the loops in a reverse order of its reception. Demodulation is initiated as a common state of both loops in a mid-portion of the signal burst. The previously stored first half portion is backwardly demodulated by one of the loops, while the other loop demodulates the second half portion of the burst. The whole burst is recovered by storing the demodulated first and second half portions in random access memory, and then reordering the stored demodulated burst by reading the memory backwards for the first portion.
REFERENCES:
patent: 4712221 (1987-12-01), Pearce et al.
patent: 4726043 (1988-02-01), Levesque
patent: 4807254 (1989-02-01), Otani
"Block Demodulation for Short Radio Packet", Electronics and Communications in Japan, vol. 67-B, No. 5, Junji Namiki, 1984.
"Digital Communications by Satellite", Prentice-Hall, James J. Spilker, Jr., 1977, pp. 288-289.
Chuang Justin C.
Sollenberger Nelson R.
Bell Communications Research Inc.
Falk James W.
Gurey Stephen M.
Safourek Benedict V.
Smith Ralph
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