Digital telecommunication radio using mutually orthogonal spreading codes to simultaneously transmit multiple data channels within the same ISM transmission band
First Claim
1. A communication architecture comprising:
- a plurality of signal spreaders which are adapted to spread respective input data streams coupled thereto in accordance with mutually orthogonal spreading sequences, and thereby produce a plurality of spread data streams; and
a output unit which is adapted to combine said plurality of spread data streams into a composite spread output data stream for transmission over a communication channel.
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Abstract
A spread spectrum communication system for wirelessly transporting autonomously time-referenced telecommunication data couples the data streams to mutually synchronized multiplexers, outputs of which are encoded and applied to associated I and Q channel spreaders, which spread the respective multiplexed data streams using mutually orthogonal spreading code sequences. The resulting spread I-channel data streams are coupled to I and Q channel summing units outputs of which are applied to respective channels of a QPSK modulator and transmitted to a receiver site. At the receiver the QPSK signals are correlated in despreading correlators and then decoded and demultiplexed to produce data streams, corresponding to those applied to the transmitter.
9 Citations
20 Claims
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1. A communication architecture comprising:
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a plurality of signal spreaders which are adapted to spread respective input data streams coupled thereto in accordance with mutually orthogonal spreading sequences, and thereby produce a plurality of spread data streams; and
a output unit which is adapted to combine said plurality of spread data streams into a composite spread output data stream for transmission over a communication channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of transmitting information contained in a plurality of input data streams comprising the steps of:
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(a) spreading said input data streams in accordance with mutually orthogonal spreading sequences, so as to produce a plurality of spread data streams; and
(b) combining said plurality of spread data streams into a composite spread output data stream for transmission over a communication channel. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for demodulating a communication signal that has been received from a communication channel and contains a waveform comprised of a composite of a plurality of spread data streams respective ones of which have been spread in accordance with respective, mutually orthogonal spreading sequences, said apparatus comprising:
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a plurality of signal despreaders, adapted to despread said composite of said plurality of spread data streams into respective output data streams, in accordance with respective ones of said mutually orthogonal spreading sequences; and
output interface circuits coupled to said signal despreaders and being adapted to output said respective output data streams despread by said plurality of signal despreaders. - View Dependent Claims (18, 19, 20)
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Specification