Patent ID: 6515981
Filing Date: 2003-02-04
Classification: H04B,H04J,H04W

Abstract:
A packet-switched system for communicating data, comprising:a plurality of packet transmitters, each packet transmitter including, a transmitter-first-in-first-out (transmitter-FIFO) memory, coupled to a data input, for storing data; a demultiplexer, coupled to said transmitter-FIFO memory and having a plurality of outputs, for demultiplexing the stored data into a first plurality of sub-data-sequence signals and a second plurality of sub-data-sequence signals, with a respective sub-data-sequence signal at a respective output a said demultiplexer; chip-sequence means for outputting a plurality of chip-sequence signals, with each chip-sequence signal orthogonal to the other chip-sequence signals in said plurality of chip-sequence signals; a first plurality of product devices, coupled to the plurality of outputs of said demultiplexer, respectively, and to said chip-sequence means, for multiplying each of the first plurality of sub-data-sequence signals by a chip-sequence signal of the plurality of chip-sequence signals, respectively, thereby generating a first plurality of spread-spectrum channels; a second plurality of product devices, coupled to the plurality of outputs of said demultiplexer, respectively, and to said chip-sequence means, for multiplying each of the second plurality of sub-data-sequence signals, by a chip-sequence signal of the plurality of chip-sequence signals, respectively, thereby generating a second plurality of spread-spectrum channels; a first combiner, coupled to the first plurality of product devices, for algebraically combining the first plurality of spread-spectrum channels as a first multichannel-spread-spectrum signal; a first header device, coupled to said first combiner, for concatenating a header to the first multichannel-spread-spectrum signal, thereby generating a first packet-spread-spectrum signal; a second combiner, coupled to the second plurality of product devices, for algebraically combining the second plurality of spread-spectrum channels as a second multichannel-spread-spectrum signal; a second header device, coupled to said second combiner, for concatenating a header to the second multichannel-spread-spectrum signal, thereby generating a second packet-spread-spectrum signal; a transmitter subsystem, coupled to said first and second header devices, for combining the first and second packet-spread-spectrum signals as a QAM-spread-spectrum signal and for transmitting the QAM-spread-spectrum signal on a carrier frequency using radio waves over a communications channel; and a plurality of packet receivers, each packet receiver including, a translating device, coupled to the communications channel, for translating the QAM-spread-spectrum signal from the carrier frequency to a processing frequency; a header-matched-filter integrator, coupled to said translating device, for processing, at the processing frequency, the header in the QAM-spread-spectrum signal; a first plurality of data-matched filters, coupled to said translating device, with each of said first plurality of data-matched filters having an impulse response matched to a chip-sequence signal of the plurality of chip-sequence signals, respectively, for despreading the first multichannel-spread-spectrum signal embedded in the QAM-spread-spectrum signal as a first plurality of received spread-spectrum channels, respectively; a second plurality of data-matched filters, coupled to said translating device, with each of said second plurality of data-matched filters having an impulse response matched to a chip-sequence signal of the plurality of chip-sequence signals, respectively, for despreading the second multichannel-spread-spectrum signal embedded in the QAM-spread-spectrum signal as a second plurality of received spread-spectrum channels, respectively; and a multiplexer, coupled to said first plurality of data-matched filters and to said second plurality of data-matched filters, for multiplexing the first and second plurality of received spread-spectrum channels as received data.