Transmission system comprising receiver with improved timing mea

Details Transmission system comprising receiver with improved timing mea Transmission system comprising receiver with improved timing mea

1993-02-18

1995-06-20

Chin, Stephen

Pulse or digital communications

Synchronizers

327261, H04L 700

Patent

active

054266718

ABSTRACT:
A data transmission system wherein the data symbols to be transmitted are divided into two groups, for example odd and even, and each data symbol in one group is represented by a signal element which differs from the signal element used to represent each data symbol in the other group. An example of such encoding is the quadra-phase code. The transmitted signal is a summation of the signal elements of both groups. At the receiver the received signal is sampled at a first and a second sampling instant for every two successive signal elements, and from the sample values decisions are made as to the symbol values represented thereby. This requires that the sampling instants accurately correspond to the two groups of signal elements. To achieve such timing control the receiver includes a phase detector for deriving an error signal representing deviation between actual and correct sampling instants, and the actual sampling instants are adapted to minimize the error signal. The error signal is based on a correlation between the values of samples at the sampling instants and expected values thereof at such instants.

REFERENCES:
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patent: 4866739 (1989-09-01), Aoazzi et al.
patent: 5259005 (1993-11-01), LeRosa et al.
"Q. P., An Improved Code for High Density Digital Recording", by Bixby et al, IEEE, vol. MAG 15, No. 6, Nov. 1989, pp. 1465-1467.
"Timing Recovery in Digital Synchronous Data Receivers", by K. Mueller et al, IEEE, vol. COM-24, No. 5, May, 1976, pp. 516-531.
"Two New Equalisation Schemes for High-Density Digital Magnetic Recording Systems with Quad-Phase Modulation Code", Electronics Letters, Jan. 4, 1990, vol. 26, No. 1, pp. 13-15.
"Concise Papers", by R. Wood, IEEE Transactions on Communications, vol. COM-31, No. 1, Jan. 1983, pp. 105-110.
"Dual Digital Transmission System for Multipair Cables Based on `Crank-Shaft Coding`", Electronics Letters Jul, 19, 1984, vol. 20, No. 15, pp. 619-621.

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