Digital data radio transmission system

Details Digital data radio transmission system Digital data radio transmission system

1991-09-03

1994-07-12

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375118, H04L 700

Patent

active

053295579

ABSTRACT:
A digital data radio transmission system for reproducing pre-velocity-modulation input frame data from the radio frame data subjected to velocity modulation and pulse insertion. The system includes a write counter that divides write clock pulses under control of frame position pulses to output write pulses; an elastic memory that temporarily stores the input frame data and the frame position pulses as per the write pulses; and a timing pulse generator that outputs control pulses in response to the supply of read clock pulses under control of the frame position pulses from the elastic memory. The system further comprises a read counter that divides the write clock pulses by the same number as with the division by the write counter to output read pulses; and a pulse inserting section that inserts pulses into the output frame data read from the elastic memory as per the read pulses to generate the radio frame data. Because the control operations involved are performed in accordance with the frame position pulses, the input frame data matches the radio frame data in terms of frame phase.

REFERENCES:
patent: 4002844 (1977-01-01), Doussoux
patent: 4823365 (1989-04-01), Loginov
patent: 4928275 (1990-05-01), Moore et al.
patent: 4965884 (1990-10-01), Okura et al.
patent: 5128939 (1992-07-01), Takatori et al.
patent: 5146477 (1992-09-01), Cantoni et al.
Rokugo et al., "An Asynchronous DS3 Cross-Connect System with Add/Drop Capability", IEEE Global Telecommunications Conference, Nov. 28-Dec. 1, 198, Hollywood, Florida, U.S.; Conference Record, vol. 3, No. 3 of 3, pp. 1555-1559; IEEE, New York, U.S., 1988.

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