Synchronization tracking in pulse position modulation receiver

Details Synchronization tracking in pulse position modulation receiver Synchronization tracking in pulse position modulation receiver

1984-08-07

1987-03-03

Orsino, Jr., Joseph A.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

329107, 375 23, 375110, 375120, H04B 900

Patent

active

046481338

ABSTRACT:
A clock pulse generator for decoding pulse position modulation in an optical communication receiver is synchronized by a delay tacking loop which multiplies impulses of a data pulse by the square-wave clock pulses from the generator to produce positive impulses when the clock pulse is of one level, and negative impulses when the clock pulse is of another level. A delay tracking loop integrates the impulses and produces an error signal that adjusts the delay so the clock pulses will be synchronized with data pulses. A dead-time .tau..sub.d provided between data pulses of an interval .tau..sub.p in the data pulse period .tau.. When synchronized, the average number of positive impulses integrated will equal the average number of negative impulses over the continuous stream of data pulses.

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Ueno et al, "A Semiconductor-Laser Communication System Using Differential Pulse Position Modulation", Electronics & Communications in Japan , vol. 55-C, No. 12, Dec. 1972, pp. 83-89.

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