Diversity channel data receiver with automatic alignment over a

Details Diversity channel data receiver with automatic alignment over a Diversity channel data receiver with automatic alignment over a

1986-08-11

1988-05-10

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

455135, H04L 102

Patent

active

047440953

ABSTRACT:
An arrangement ensuring the change-over of two channels through which the same digital information is conveyed with automatic data alignment over a .+-.3.5 bit range comprises for each channel an array of buffer stores operating at a write rate H.sub.i /N.sub.i (where i=1, 2), an oscillator operating at a rate H which provides reading of the buffer stores at the rate H/N and being synchronized in phase-opposition with one or the other of the write rates, and a logic comparator controlling the write rates H.sub.i /N.sub.i, the routing of the write rates to the input of the oscillator, as well as a change-over switch for the data.
In the buffer store of the channel assumed to be the one whose quality degrades, the data are converted into N parallel streams at the rate H.sub.2 /N and are read at the rate H/N of the oscillator. In the other channel, the write rate of the buffer store is forced to the rate H.sub.1 /N-1, the read rate remaining unchanged, until there is a coincidence of N bits in the two channels; thereupon the data stream is switched, the write rate is locked at H.sub.1 /N and this write rate is applied to the oscillator.

REFERENCES:
patent: 3975687 (1976-08-01), Tan et al.
patent: 4349914 (1982-09-01), Evans
patent: 4417348 (1983-11-01), Abbruscato

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