Multiple-input multiple-output (MIMO) spread spectrum system and method
DC CAFCFirst Claim
1. A multiple-input-multiple-output (MIMO) method for receiving data having symbols, with the data having symbols demultiplexed into a plurality of subchannels of data, with the plurality of subchannels of data spread-spectrum processed with a plurality of chip-sequence signals, respectively, with each chip-sequence signal different from other chip-sequence signals in the plurality of chip-sequence signals, thereby generating a plurality of spread-spectrum-subchannel signals, respectively, with the plurality of spread-spectrum-subchannel signals radiated, using radio waves, from a plurality of antennas as a plurality of spread-spectrum signals, respectively, with the plurality of spread-spectrum signals passing through a communications channel having multipath, thereby generating, from the plurality of spread-spectrum signals, at least a first spread-spectrum signal having a first channel of data arriving from a first path of the multipath, and a second spread-spectrum signal having a second channel of data arriving from a second path of the multipath, comprising the steps of:
- receiving the first spread-spectrum signal and the second spread-spectrum signal with a plurality of receiver antennas;
detecting, at each receiver antenna of the plurality of receiver antennas, the first spread-spectrum signal as a first plurality of detected spread-spectrum signals, respectively;
detecting, at each receiver antenna of the plurality of receiver antennas, the second spread-spectrum signal as a second plurality of detected spread-spectrum signals, respectively;
combining, from each receiver antenna of the plurality of receiver antennas, each of the first plurality of detected spread-spectrum signals, thereby generating a first combined signal; and
combining, from each receiver antenna of the plurality of receiver antennas, each of the second plurality of detected spread-spectrum signals, thereby generating a second combined signal.
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Abstract
A system and method for transmitting a plurality of spread-spectrum signals over a communications channel having fading. The plurality of spread-spectrum signals are radiated by a plurality of antennas, with each antenna preferably spaced by one-quarter wavelength. A plurality of receiver antennas receive the plurality of spread-spectrum signals and a plurality of fading spread-spectrum signals. Each receiver antenna is coupled to a plurality of matched filters having a respective plurality of impulse responses matched to the chip-sequence signals of the plurality of spread-spectrum signals. A RAKE and space-diversity combiner combines, for each respective chip-sequence signal, a respective plurality of detected spread-spectrum signals and a respective multiplicity of detected-multipath-spread-spectrum signals, to generate a plurality of combined signals. The symbol amplitudes can be measured and erasure decoding employed to improve performance.
204 Citations
145 Claims
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1. A multiple-input-multiple-output (MIMO) method for receiving data having symbols, with the data having symbols demultiplexed into a plurality of subchannels of data, with the plurality of subchannels of data spread-spectrum processed with a plurality of chip-sequence signals, respectively, with each chip-sequence signal different from other chip-sequence signals in the plurality of chip-sequence signals, thereby generating a plurality of spread-spectrum-subchannel signals, respectively, with the plurality of spread-spectrum-subchannel signals radiated, using radio waves, from a plurality of antennas as a plurality of spread-spectrum signals, respectively, with the plurality of spread-spectrum signals passing through a communications channel having multipath, thereby generating, from the plurality of spread-spectrum signals, at least a first spread-spectrum signal having a first channel of data arriving from a first path of the multipath, and a second spread-spectrum signal having a second channel of data arriving from a second path of the multipath, comprising the steps of:
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receiving the first spread-spectrum signal and the second spread-spectrum signal with a plurality of receiver antennas;
detecting, at each receiver antenna of the plurality of receiver antennas, the first spread-spectrum signal as a first plurality of detected spread-spectrum signals, respectively;
detecting, at each receiver antenna of the plurality of receiver antennas, the second spread-spectrum signal as a second plurality of detected spread-spectrum signals, respectively;
combining, from each receiver antenna of the plurality of receiver antennas, each of the first plurality of detected spread-spectrum signals, thereby generating a first combined signal; and
combining, from each receiver antenna of the plurality of receiver antennas, each of the second plurality of detected spread-spectrum signals, thereby generating a second combined signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 49, 50, 51, 52, 73, 74, 75, 76)
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9. A multiple-input-multiple-output (MIMO) system for receiving data having symbols, with the data having symbols demultiplexed into a plurality of subchannels of data, with the plurality of subchannels of data spread-spectrum processed with a plurality of chip-sequence signals, respectively, with each chip-sequence signal different from other chip-sequence signals in the plurality of chip-sequence signals, thereby generating a plurality of spread-spectrum-subchannel signals, respectively, with the plurality of spread-spectrum-subchannel signals radiated, using radio waves, from a plurality of antennas as a plurality of spread-spectrum signals, respectively, with the plurality of spread-spectrum signals passing through a communications channel having multipath, thereby generating, from the plurality of spread-spectrum signals, at least a first spread-spectrum signal having a first channel of data arriving from a first path of the multipath, and a second spread-spectrum signal having a second channel of data arriving from a second path of the multipath, comprising:
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a plurality of receiver antennas for receiving the first spread-spectrum signal and the second spread-spectrum signal;
a plurality of despreading devices for detecting, at each receiver antenna of the plurality of receiver antennas, the first spread-spectrum signal and the second spread-spectrum signal, as a first plurality of detected spread-spectrum signals and a second plurality of detected spread-spectrum signals, respectively; and
a plurality of combiners for combining, from each receiver antenna of the plurality of receiver antennas, each of the first plurality of detected spread-spectrum signals, thereby generating a first combined signal, and for combining, from each receiver antenna of the plurality of receiver antennas, each of the second plurality of detected spread-spectrum signals, thereby generating a second combined signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 53, 54, 55, 56, 77, 78, 79, 80)
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17. A MIMO system for receiving data having symbols, with the data having symbols demultiplexed into a plurality of subchannels of data, with the plurality of subchannels of data spread-spectrum processed with a plurality of chip-sequence signals, respectively, with each chip-sequence signal different from other chip-sequence signals in the plurality of chip-sequence signals, thereby generating a plurality of spread-spectrum-subchannel signals, respectively, with the plurality of spread-spectrum-subchannel signals radiated, using radio waves, from a plurality of antennas as a plurality of spread-spectrum signals, respectively, with the plurality of spread-spectrum signals passing through a communications channel having multipath, thereby generating, from the plurality of spread-spectrum signals, at least a first spread-spectrum signal having a first channel of data arriving from a first path of the multipath, and a second spread-spectrum signal having a second channel of data arriving from a second path of the multipath, comprising:
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receiver-antenna means for receiving the first spread-spectrum signal and the second spread-spectrum signal;
despreading means, coupled to said receiver-antenna means, for detecting, at each receiver antenna of the plurality of receiver antennas, the first spread-spectrum signal and the second spread-spectrum signal, as a first plurality of detected spread-spectrum signals and a second plurality of detected spread-spectrum signals, respectively; and
combiner means, coupled to said despreading means, for combining, from each receiver antenna of the plurality of receiver antennas, each of the first plurality of detected spread-spectrum signals, thereby generating a first combined signal, and for combining, from each receiver antenna of the plurality of receiver antennas, each of the second plurality of detected spread-spectrum signals, thereby generating a second combined signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 57, 58, 59, 60, 81, 82, 83, 84)
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25. A multiple input multiple output (MIMO) method improvement, for transmitting data having symbols, over a communications channel, comprising the steps of:
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demultiplexing the data into a plurality of subchannels of data;
spread-spectrum processing the plurality of subchannels of data, with the plurality of subchannels of data spread-spectrum processed with a plurality of chip-sequence signals, respectively, with each chip-sequence signal different from other chip-sequence signals in the plurality of chip-sequence signals, thereby generating a plurality of spread-spectrum-subchannel signals, respectively;
radiating from a plurality of antennas, using radio waves, the plurality of spread-spectrum-subchannel signals, over the communications channel, as a plurality of spread-spectrum signals, respectively;
imparting, from the communications channel, multipath on the plurality of spread-spectrum signals, thereby generating at least a first spread-spectrum signal having a first channel of data arriving from a first path of the multipath, and a second spread-spectrum signal having a second channel of data arriving from a second path of the multipath;
receiving the first spread-spectrum signal and the second spread-spectrum signal with a plurality of receiver antennas;
detecting, at each receiver antenna of the plurality of receiver antennas, the first spread-spectrum signal and the second spread-spectrum signal, as a first plurality of detected spread-spectrum signals and a second plurality of detected spread-spectrum signals, respectively;
combining, from each receiver antenna of the plurality of receiver antennas, each of the first plurality of detected spread-spectrum signals, thereby generating a first combined signal; and
combining, from each receiver antenna of the plurality of receiver antennas, each of the second plurality of detected spread-spectrum signals, thereby generating a second combined signal. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 61, 62, 63, 64, 85, 86, 87, 88)
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33. A multiple input multiple output (MIMO) system, for transmitting data having symbols, over a communications channel, comprising:
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a demultiplexer for demultiplexing the data into a plurality of subchannels of data;
a plurality of spread-spectrum devices for spread-spectrum processing the plurality of subchannels of data, with the plurality of subchannels of data spread-spectrum processed with a plurality of chip-sequence signals, respectively, with each chip-sequence signal different from other chip-sequence signals in the plurality of chip-sequence signals, thereby generating a plurality of spread-spectrum-subchannel signals, respectively;
a plurality of transmitter antennas for radiating, using radio waves, the plurality of spread-spectrum-subchannel signals, over the communications channel, as a plurality of spread-spectrum signals, respectively;
said communications channel for imparting multipath on the plurality of spread-spectrum signals, thereby generating at least a first spread-spectrum signal having a first channel of data arriving from a first path of the multipath, and a second spread-spectrum signal having a second channel of data arriving from a second path of the multipath;
a plurality of receiver antennas for receiving the first spread-spectrum signal and the second spread-spectrum signal;
a plurality of despreading devices for detecting, at each receiver antenna of the plurality of receiver antennas, the first spread-spectrum signal and the second spread-spectrum signal, as a first plurality of detected spread-spectrum signals and a second plurality of detected spread-spectrum signals, respectively; and
a plurality of combiners for combining, from each receiver antenna of the plurality of receiver antennas, each of the first plurality of detected spread-spectrum signals, thereby generating a first combined signal, and for combining, from each receiver antenna of the plurality of receiver antennas, each of the second plurality of detected spread-spectrum signals, thereby generating a second combined signal. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 65, 66, 67, 68, 89, 90, 91, 92)
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41. A multiple input multiple output (MIMO) system, for transmitting data having symbols, over a communications channel, comprising:
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demultiplexer means for demultiplexing the data into a plurality of subchannels of data;
spread-spectrum processing means for spread-spectrum processing the plurality of subchannels of data, with the plurality of subchannels of data spread-spectrum processed with a plurality of chip-sequence signals, respectively, with each chip-sequence signal different from other chip-sequence signals in the plurality of chip-sequence signals, thereby generating a plurality of spread-spectrum-subchannel signals, respectively;
a plurality of transmitter-antenna means for radiating, using radio waves, the plurality of spread-spectrum-subchannel signals, over the communications channel, as a plurality of spread-spectrum signals, respectively;
said communications channel for imparting multipath on the plurality of spread-spectrum signals, thereby generating at least a first spread-spectrum signal having a first channel of data arriving from a first path of the multipath, and a second spread-spectrum signal having a second channel of data arriving from a second path of the multipath;
receiver-antenna means for receiving the first spread-spectrum signal and the second spread-spectrum signal;
despreading means, coupled to said receiver-antenna means, for detecting, at each receiver antenna of the plurality of receiver antennas, the first spread-spectrum signal and the second spread-spectrum signal, as a first plurality of detected spread-spectrum signals and a second plurality of detected spread-spectrum signals, respectively; and
combiner means, coupled to said despreading means, for combining, from each receiver antenna of the plurality of receiver antennas, each of the first plurality of detected spread-spectrum signals, thereby generating a first combined signal, and for combining, from each receiver antenna of the plurality of receiver antennas, each of the second plurality of detected spread-spectrum signals, thereby generating a second combined signal. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 69, 70, 71, 72, 93, 94, 95, 96)
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97. A receiver system for recovering data conveyed in data symbols by a plurality of different signals transmitted on separate carrier waves from a single source over a wireless channel, said signals being differentiated by different codes conveyed along with said signals, comprising:
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plural receiving antennas for receiving said signals;
receiver circuitry connected to each receiving antenna for demodulating said received signals and for separating said signals by detecting said different codes conveyed in said signals;
combiner circuits for combining received data symbols transmitted in signals with the same code and received by different receiving antennas, thereby forming plural streams of combined data symbols; and
a multiplexer for multiplexing data derived from said plural streams of combined data symbols to form a single stream of data. - View Dependent Claims (98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108)
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109. A method for recovering data conveyed in data symbols by a plurality of different signals transmitted on separate carrier waves from a single source over a wireless channel, said signals being differentiated by different codes conveyed along with said signals, comprising the steps of:
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receiving said signals at plural receiving antennas;
demodulating the signals received at each receiving antenna and separating said signals by detecting said different codes conveyed in said signals;
recovering the data symbols conveyed in said signals and combining received data symbols transmitted in signals with the same code and received by different receiving antennas, thereby forming plural streams of combined data symbols; and
multiplexing data derived from said plural streams of combined data symbols to form a single stream of data. - View Dependent Claims (110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120)
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121. A receiver system for recovering data in spread spectrum signals, the data conveyed in data symbols by a plurality of different signals transmitted on separate carrier waves from a single source over a wireless channel, said signals being differentiated by different codes conveyed along with said signals, comprising:
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plural receiving antennas for receiving said spread spectrum signals;
receiver circuitry connected to each receiving antenna for despreading and separating said received spread spectrum signals by detecting said different codes conveyed in said spread spectrum signals;
combiner circuits for combining received data symbols transmitted in signals with the same code and received by different receiving antennas, thereby forming plural streams of combined data symbols; and
a multiplexer for multiplexing data derived from said plural streams of combined data symbols to form a single stream of data symbols. - View Dependent Claims (122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132)
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133. A method for recovering data in spread spectrum signals, the data conveyed in data symbols by a plurality of different signals transmitted on separate carrier waves from a single source over a wireless channel, said signals being differentiated by different codes conveyed along with said signals, comprising the steps of:
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receiving said spread spectrum signals at plural receiving antennas;
despreading and separating the spread spectrum signals received at each receiving antenna by detecting said different codes conveyed in said spread spectrum signals;
recovering the data symbols conveyed in said spread spectrum signals and combining received data symbols transmitted in signals with the same code and received by different receiving antennas, thereby forming plural streams of combined data symbols; and
multiplexing data derived from said plural streams of combined data symbols to form a single stream of data. - View Dependent Claims (134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145)
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Specification