T1 radio having coding gain adjustable for number of channels

Details T1 radio having coding gain adjustable for number of channels T1 radio having coding gain adjustable for number of channels

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

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