Communication over noisy lines

Details Communication over noisy lines Communication over noisy lines

H - Electricity

04

B

340/79

H04B 3/54 (2006.01) H04B 1/707 (2006.01) H04L 23/02 (2006.01)

Patent

CA 1187960

: 23 : ABSTRACT OF THE DISCLOSURE A line network communication system transmits coded data signals on a base band carrier signal and includes a receiver capable of recovering the coded data signals from transmitted signals. The receiver operates in a search mode initially, in which a series of data signals received is compared, at different relative phases, with a series of coded reference signals using an arrangement of shift registers and an exclusive OR gate. The reference signals are generated by a coder under the command of a central control unit. The control unit monitors the results of comparisons and varies, by means of a shifter circuit, the relative phase of compared signals until at least one comparison indicates a degree of correlation exceeding a threshold value. The control unit then operates, in a tracking mode, to verify that said degree of correlation is maintained for a preset number of subsequent comparisons and in dependence on a successful verification enters a locking mode. The control unit maintains a selected phase difference between compared series while the degree of correlation exceeding said threshold value exists.

422960

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