High efficiency spread spectrum system and method
DC CAFCFirst Claim
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1. A multichannel-spread-spectrum system for communicating a plurality of data-sequence signals from a plurality of data channels using parallel chip-sequence signals, comprising:
- a header device, coupled to a first data channel of said plurality of data channels, for concatenating a header to a first data-sequence signal;
a processor for synchronizing a remaining plurality of data channels to the header in the first data channel;
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 plurality of product devices, coupled to said chip-sequence means, for multiplying each of said plurality of data-sequence signals by a respective chip-sequence signal, thereby generating a plurality of spread-spectrum channels, respectively;
a combiner, coupled to the plurality of product devices, for algebraically combining the plurality of spread-spectrum channels as a multichannel-spread-spectrum signal;
a transmitter subsystem, coupled to said combiner, for transmitting the multichannel-spread-spectrum signal on a carrier frequency over a communications channel;
a translating device, coupled to the communications channel, for translating the received multichannel-spread-spectrum signal from the carrier frequency to a processing frequency;
a header-matched filter, coupled to said translating device and having an impulse response matched to the header, for detecting, at the processing frequency, the header in the multichannel-spread-spectrum signal, and for outputting, responsive to detecting the header, a header-detection signal;
a receiver processor, coupled to said header-matched filter, responsive to the header-detection signal, for generating control and timing signals; and
a plurality of data-matched filters, coupled to said translating device, with each data-matched filter having an impulse response matched to a respective chip-sequence signal of the plurality of chip-sequence signals, for despreading the received multichannel-spread-spectrum signal as a plurality of received spread-spectrum channels, respectively.
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Abstract
A multichannel-spread-spectrum system for communicating a plurality of data-sequence signals from a plurality of data channels using parallel chip-sequence signals in which fewer than all of the channels include header information. A header device concatenates a header to a first data-sequence signal on a first channel. Data-sequence signals in parallel channels are sent without a header, and are timed from the header in the first channel.
8 Citations
7 Claims
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1. A multichannel-spread-spectrum system for communicating a plurality of data-sequence signals from a plurality of data channels using parallel chip-sequence signals, comprising:
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a header device, coupled to a first data channel of said plurality of data channels, for concatenating a header to a first data-sequence signal; a processor for synchronizing a remaining plurality of data channels to the header in the first data channel; 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 plurality of product devices, coupled to said chip-sequence means, for multiplying each of said plurality of data-sequence signals by a respective chip-sequence signal, thereby generating a plurality of spread-spectrum channels, respectively; a combiner, coupled to the plurality of product devices, for algebraically combining the plurality of spread-spectrum channels as a multichannel-spread-spectrum signal; a transmitter subsystem, coupled to said combiner, for transmitting the multichannel-spread-spectrum signal on a carrier frequency over a communications channel; a translating device, coupled to the communications channel, for translating the received multichannel-spread-spectrum signal from the carrier frequency to a processing frequency; a header-matched filter, coupled to said translating device and having an impulse response matched to the header, for detecting, at the processing frequency, the header in the multichannel-spread-spectrum signal, and for outputting, responsive to detecting the header, a header-detection signal; a receiver processor, coupled to said header-matched filter, responsive to the header-detection signal, for generating control and timing signals; and a plurality of data-matched filters, coupled to said translating device, with each data-matched filter having an impulse response matched to a respective chip-sequence signal of the plurality of chip-sequence signals, for despreading the received multichannel-spread-spectrum signal as a plurality of received spread-spectrum channels, respectively. - View Dependent Claims (2, 3, 4)
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5. A multichannel-spread-spectrum transmitter for communicating a plurality of data-sequence signals from a plurality of data channels using parallel chip-sequence signals, comprising:
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a header device, coupled to a first data channel of said plurality of data channels, for concatenating a header to a first data-sequence signal to generate a header frame; a processor, coupled to the header device and to the plurality of data channels, for synchronizing the plurality of data channels; spread-spectrum means, coupled to the plurality of data channels, for spread-spectrum processing the plurality of data-sequence signals by a plurality of chip-sequence signals, respectively, thereby generating a plurality of spread-spectrum channels, the plurality of spread-spectrum channels including a spread-spectrum-header channel generated by processing the header frame with a first chip-sequence signal, and a plurality of spread-spectrum-data channels; combiner means, coupled to said spread-spectrum means, for algebraically combining the plurality of spread-spectrum channels as a multichannel-spread-spectrum signal; and carrier means, coupled to said combiner means, for transmitting the multichannel-spread-spectrum signal over a communications channel at a carrier frequency. - View Dependent Claims (6)
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7. A multichannel-spread-spectrum transmitter for communicating a plurality of data-sequence signals from a plurality of data channels using parallel chip-sequence signals, comprising:
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a header device, coupled to a first data channel of said plurality of data channels, for concatenating a header to a first data-sequence signal to generate a header frame; a processor, coupled to the header device and to the plurality of data channels, for synchronizing the plurality of data channels; a chip-sequence generator for generating a plurality of chip-sequence signals, each of said plurality of chip-sequence signals being orthogonal to other chip-sequence signals within the plurality of chip-sequence signals; a plurality of product devices, coupled to the plurality of data channels and to said chip-sequence generator, for multiplying the plurality of data-sequence signals by a plurality of chip-sequence signals, respectively, thereby generating a plurality of spread-spectrum channels, the plurality of spread-spectrum channels including a spread-spectrum-header channel and a plurality of spread-spectrum-data channels, the spread-spectrum-header channel generated by multiplying the header frame with a first chip-sequence signal, each of the plurality of spread-spectrum-data channels generated by multiplying a respective data-sequence signal by a respective chip-sequence signal; a combiner, coupled to said plurality of product devices, for algebraically combining the plurality of spread-spectrum channels as a multichannel-spread-spectrum signal; and a transmitter subsystem, coupled to said combiner, for transmitting the multichannel-spread-spectrum signal over a communications channel at a carrier frequency.
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Specification