Transmission system for a combination of a main signal and an au

Details Transmission system for a combination of a main signal and an au Transmission system for a combination of a main signal and an au

1993-10-08

1995-02-14

Marcelo, Melvin

Multiplex communications

Wide area network

Packet switching

3701101, 3701104, 359124, 359156, 359187, H04J 1402, H04J 1406

Patent

active

053901851

ABSTRACT:
A transmission system includes a transmitter for transmitting to a communication channel a send signal which is a combination of a main signal and an auxiliary signal. The send signal is received by a receiver which recovers the auxiliary signal therefrom, and which includes a frequency control loop having a bandwidth which is larger than that of the auxiliary signal. Recovery of the auxiliary signal by a frequency control loop reduces the complexity of the receiver. By including a series of digital symbols in the auxiliary signal, it is possible to send additional information along with the main signal without requiring any significant increase in complexity of the transmission system.

REFERENCES:
patent: 4471494 (1984-09-01), Keil et al.
patent: 4524462 (1985-06-01), Cottatelucci
patent: 4716563 (1987-12-01), Roust
patent: 4763326 (1988-08-01), Krick
patent: 4972408 (1990-11-01), Le Bihan Herve et al.
Q. Jiang, "Channel Selection and Identification for Coherent Optical FDM Systems", IEEE Photonics Technology Letters, vol. 3, No. 8, Aug. 1991, pp. 767-768.
J. A. Kitchen and P. Cochrane, "A Novel Service/Supervisory Channel for Digital Trunk Transmission Systems," Second International Conference on Telecommunication Transmission Into the Digital Era, London, England (17-20 Mar. 1981), pp. 159-163.

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