Multi-channel spread spectrum system

A multi-channel spread-spectrum modulator subsystem, comprising:

• a demultiplexer for demultiplexing a representation of an input data stream into a plurality of sub-channel data-sequence signals;
• a plurality of mapping circuits, one of which is coupled to receive each respective sub-channel data-sequence signal from the demultiplexer, wherein each mapping circuit is for mapping predetermined-length segments of the respective sub-channel data-sequence signal to generate a respective phase modulated spread-spectrum sub-channel signal, each of the mapping circuits comprising:
• (a) a code-mapping circuit for mapping a predetermined m-bits of each segment of the respective sub-channel data sequence signal to a selected one of a unique plurality of orthogonal spreading-codes;
• (b) a phase-mapping circuit for mapping a remaining k-bits of each segment of the respective sub-channel data-sequence signal to a selected one of a plurality of distinct phasor signals;
• and
• (c) a product device for modulating each selected code sequence from the code-mapping circuit with a corresponding selected phasor signal from the phase-mapping circuit, to generate the respective spread-spectrum sub-channel signal;
• and
• a signal combiner for receiving the respective spread-spectrum sub-channel signals from the mapping circuits for transmission.

A multi-channel spread-spectrum modulator subsystem, comprising:

• a demultiplexer for demultiplexing a representation of an input data stream into a plurality of sub-channel data-sequence signals and supplying each respective sub-channel data-sequence signal to a respective output of the demultiplexer;
• code-mapping circuits, wherein a respective code-mapping circuit is coupled to each respective output of the demultiplexer, each code-mapping circuit for mapping predetermined m-bit segments of the respective sub-channel data-sequence signal to a plurality of orthogonal spreading-codes;
• phase-mapping circuits, wherein a respective phase-mapping circuit is coupled to each respective output of the demultiplexer, each phase-mapping circuit for mapping predetermined k-bit segments of the respective sub-channel data-sequence signal to a plurality of distinct phasor signals;
• product devices, wherein a respective product device is for modulating each code sequence output of a respective code-mapping circuit with a corresponding phasor signal output from a respective phase-mapping circuit to generate a spread-spectrum sub-channel signal;
• a complex signal combiner, receiving the spread-spectrum sub-channel signals from the product devices, for algebraically combining the plurality of spread-spectrum sub-channel signals to form an in-phase multi-channel spread-spectrum signal and a quadrature multi-channel spread-spectrum signal for transmission.

A method of transmitting an information data stream comprising:

• separating the information data stream into a plurality of respective sub-channel data streams;
• code-mapping predetermined m-bit segments of each respective sub-channel data-sequence signal to a plurality of orthogonal spreading-codes;
• phase-mapping k-bit segments of each respective sub-channel data-sequence signal to a plurality of distinct phasor signals;
• for each of the sub-channels, multiplying respective orthogonal spreading-codes with corresponding phasor signals to form a respective sub-channel spread-spectrum signal;
• combining all of the sub-channel spread-spectrum signals to form at least one combined signal;
• modulating the at least one combined signal with a cell-site specific cover code to form a spread-spectrum channel signal;
• and
• transmitting the spread-spectrum channel signal over a wireless air-link.

A communication system, comprising:

• a transmitter system, comprising:
• 1) a demultiplexer for demultiplexing a representation of an input data stream into a plurality of sub-channel data-sequence signals and supplying each respective sub-channel data-sequence signal to a respective output of the demultiplexer;
• 2) code-mapping circuits, wherein a respective code-mapping circuit is coupled to each respective output of the demultiplexer, each code-mapping circuit for mapping predetermined m-bit segments of the respective sub-channel data-sequence signal to a plurality of orthogonal spreading-codes;
• 3) phase-mapping circuits, wherein a respective phase-mapping circuit is coupled to each respective output of the demultiplexer, each phase-mapping circuit for mapping predetermined k-bit segments of the respective sub-channel data-sequence signal to a plurality of distinct phasor signals;
• 4) product devices, wherein a respective product device is for modulating each code sequence output from a respective code-mapping circuit with a corresponding phasor signal output from a respective phase-mapping circuit to generate a spread-spectrum channel signal;
• 5) a complex signal combiner, receiving the spread-spectrum channel signals from the product devices, for algebraically combining the plurality of spread-spectrum channels to form an in-phase multi-channel spread-spectrum signal and a quadrature multi-channel spread-spectrum signal;
• and
• 6) a modulator for modulating the in-phase multi-channel spread-spectrum signal and a quadrature multi-channel spread-spectrum signal and transmitting the modulated signals over a wireless air-link;
• and
• a receiver system, for receiving and processing the modulated signals over the wireless air-link to recover the input data stream.