A data multiplexing network is described which multiplexes a plurality of asynchronous data channels with an asynchronous data stream representing compressed voice signals and/or facsimile signals onto a single synchronous data packet stream. The single synchronous data packet stream is then transmi
A data multiplexing network is described which multiplexes a plurality of asynchronous data channels with an asynchronous data stream representing compressed voice signals and/or facsimile signals onto a single synchronous data packet stream. The single synchronous data packet stream is then transmitted by a high speed statistical multiplexer over a composite link to a second site using a modified high-level synchronous data link control protocol with an overlay of a priority statistical multiplexing algorithm. The asynchronous data channels and the compressed voice channel and/or facsimile signals are demultiplexed and reconstructed for sending to other asynchronous computer terminals and to a standard telephone or facsimile analog port at the second site, respectively. PBX trunk interfaces are also provided to allow PBX's to share the composite link between sites. Communication between the first site by voice or facsimile and the second site is transparent to the users. The multiplexer efficiently allocated the bandwidth of the composite link by detecting silence periods in the voice signals and suppressing the sending of the voice information to preserve bandwidth. The transmission of facsimile information is performed by decoding the fax transmissions, sending only the facsimile image packets over the multiplexed composite link and reassembling, with carrier, the facsimile signals at the remote site for transmission over an analog telephone line to a remote facsimile machine.
대표청구항▼
A data multiplexing network is described which multiplexes a plurality of asynchronous data channels with an asynchronous data stream representing compressed voice signals and/or facsimile signals onto a single synchronous data packet stream. The single synchronous data packet stream is then transmi
A data multiplexing network is described which multiplexes a plurality of asynchronous data channels with an asynchronous data stream representing compressed voice signals and/or facsimile signals onto a single synchronous data packet stream. The single synchronous data packet stream is then transmitted by a high speed statistical multiplexer over a composite link to a second site using a modified high-level synchronous data link control protocol with an overlay of a priority statistical multiplexing algorithm. The asynchronous data channels and the compressed voice channel and/or facsimile signals are demultiplexed and reconstructed for sending to other asynchronous computer terminals and to a standard telephone or facsimile analog port at the second site, respectively. PBX trunk interfaces are also provided to allow PBX's to share the composite link between sites. Communication between the first site by voice or facsimile and the second site is transparent to the users. The multiplexer efficiently allocated the bandwidth of the composite link by detecting silence periods in the voice signals and suppressing the sending of the voice information to preserve bandwidth. The transmission of facsimile information is performed by decoding the fax transmissions, sending only the facsimile image packets over the multiplexed composite link and reassembling, with carrier, the facsimile signals at the remote site for transmission over an analog telephone line to a remote facsimile machine. d plurality of descrambled values; and correlating the second plurality of descrambled values with a product of the first spreading sequence, an in-phase component of the second scrambling sequence and a quadrature component of the second scrambling sequence to generate the second correlation output. 4. A method according to claim 3, wherein said step of correlating the second plurality of descrambled values is preceded by the step of identifying the second scrambling sequence. 5. A method according to claim 4, wherein said step of identifying the second scrambling sequence comprises the step of detecting a signal encoded according to the second scrambling sequence. 6. A method according to claim 5: wherein said step of detecting comprises the step of detecting a plurality of signals; and wherein said step of identifying the second scrambling sequence comprises the step of identifying a scrambling sequence associated with a strongest one of the detected plurality of signals. 7. A method according to claim 3, wherein said step of combining comprises the steps of: combining the first and second correlation outputs to produce a first RAKE finger output; and combining the first RAKE finger output with a second RAKE finger output to generate an estimate of information represented by the first signal. 8. A method according to claim 3, wherein said step of combining the first and second correlation outputs comprises the step of combining the first and second correlation outputs according to channel estimates for the first and second signals. 9. A method according to claim 8, further comprising the step of estimating noise power and interference power, and wherein said step of combining the first and second correlation outputs comprises the step of combining the first and second correlation outputs according to the estimated noise power and interference power. 10. A method according to claim 3, further comprising the step of determining a set of weighting factors, and wherein said step of combining the first and second correlation outputs comprises the step of combining the first and second correlation outputs according to the determined set of weighting factors. 11. A method according to claim 10, wherein said step of determining a set of weighting factors comprises the step of adaptively determining weighting factors from at least one of known information or estimated information. 12. A method according to claim 3, wherein the communications signal includes a component associated with a third signal that is modulated according to a combination of the first scrambling sequence and a third spreading sequence that is orthogonal to the first spreading sequence, and: wherein said step of combining the first and second correlation outputs is preceded by the step of determining a minimum rotation angle that minimizes interference associated with the third signal; and wherein said step of combining the first and second correlation outputs comprises the step of combining the first and second correlation outputs according to the determined minimum rotation angle. 13. A method according to claim 3, wherein the communications signal includes a component associated with a third signal that is modulated according to a combination of the first scrambling sequence and a third spreading sequence that is orthogonal to the first spreading sequence, and: wherein said step of combining the first and second correlation outputs is preceded by the step of equalizing the first and second correlation outputs to control interference associated with the third signal; and wherein said step of combining the first and second correlation outputs comprises the step of combining the equalized first and second correlation outputs. 14. A method according to claim 13: wherein said step of correlating the first plurality of descrambled values with the first spreading sequence comprises the steps of: multiplying the first plurality of des crambled values by the first spreading sequence to generate scaled descrambled values; sorting the scaled descrambled values into first and second sets based on corresponding values of an indicator function comprising a product of in-phase and quadrature components of the first and second scrambling sequences; and accumulating respective ones of the first and second sets of scaled descrambled values to generate respective first and second sets of partial correlation output values; wherein said step of correlating the second plurality of descrambled values with a product of the first spreading sequence, an in-phase component of the second scrambling sequence and a quadrature component of the second scrambling sequence comprises the steps of: multiplying the second plurality of descrambled values by a product of the first spreading sequence, an in-phase component of the second scrambling sequence and a quadrature component of the second scrambling sequence to generate scaled descrambled values; sorting the scaled descrambled values into third and fourth sets based on corresponding values of the indicator function; and accumulating respective ones of the third and fourth sets of scaled descrambled values to generate respective third and fourth sets of partial correlation output values; and wherein said step of combining the first and second correlation outputs comprises the step of combining the first, second, third and fourth sets of partial correlation output values. 15. A method according to claim 14, wherein the first, second, third and fourth partial correlation outputs are accumulated using weights that are each functions of channel estimates, noise power estimates and interference power estimates. 16. A receiver for processing a communications signal that includes components associated with first and second signals that are modulated according to respective first and second modulation sequences, the receiver comprising: a converter operative to produce a baseband signal from the communications signal; and a complex interference orthogonalizing baseband processor responsive to the converter and operative to correlate the baseband signal with the first modulation sequence to produce a first correlation output, to correlate the baseband signal with a combination of the first modulation sequence and a complex component of the second modulation sequence to generate a second correlation output, and to combine the first and second correlation outputs to generate an estimate of information represented by the first signal. 17. A receiver according to claim 16, wherein the complex interference orthogonalizing baseband processor comprises: a first correlator operative to correlate the baseband signal with the first modulation sequence to produce a first correlation output; a second correlator operative to correlate the baseband signal with a combination of the first modulation sequence and a complex component of the second modulation sequence to generate a second correlation output; and a combiner responsive to the first and second correlators and operative to combine the first and second correlation outputs to generate an estimate of information represented by the first signal. 18. A receiver according to claim 17, wherein the second signal is modulated according to a complex scrambling sequence, and wherein the second correlator is operative to correlate the baseband signal with a combination of the first modulation sequence and the complex scrambling sequence. 19. A receiver according to claim 17, wherein the first signal is modulated according to a combination of a first scrambling sequence and a first spreading sequence, wherein the second signal is modulated according a combination of a second scrambling sequence and a second spreading sequence, and: wherein the first correlator comprises: a first descrambler operative to descramble the baseband signal with a complex conjugate of the first scrambli
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