Pulse or digital communications – Systems using alternating or pulsating current – Angle modulation
Reexamination Certificate
2007-12-04
2007-12-04
Le, Vu (Department: 2609)
Pulse or digital communications
Systems using alternating or pulsating current
Angle modulation
Reexamination Certificate
active
10839491
ABSTRACT:
A communication system for transmitting (T1) digital communication signals between a transmit site and a receiver site includes an M:1 multiplexer, coupled to a rate 1/N convolutional encoder, which is operative to output an encoded output signal modulated in quaternary phase shift keyed (QPSK) space having a prescribed symbol rate. The receive site has a rate 1/N Viterbi decoder which is operative to decode the encoded output signal output by the rate 1/N convolutional encoder, and a 1:M demultiplexer having an input coupled to the Viterbi decoder and M plurality of outputs, and being operative to demultiplex the decoded signal from the Viterbi decoder into a plurality of M time division multiplexed digital communication signals. For any selected values for of M and N, the product of M and N is constant.
REFERENCES:
patent: 2002/0040383 (2002-04-01), Zehavi
patent: 2002/0120904 (2002-08-01), Hekstra
Kliesner Matthew A.
Mester Timothy G.
Adtran Inc.
Allen Dyer Doppelt Milbrath & Gilchrist, P.A.
Le Vu
Neff Michael
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