Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system
First Claim
Patent Images
1. A method of configuring a preamble portion of a data signal for transmission over a plurality of sub-carriers by at least two antennas of a transmitter device, said method comprising:
- assigning a respective pseudo-noise (PN) code to each of said at least two antennas;
assigning each of said plurality of sub-carriers to a respective one of said at least two antennas;
modulating each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two antennas as said each of said plurality of sub-carriers such that a plurality of modulated sub-carriers are obtained that are each assigned to a respective one of said at least two antennas;
delivering each of said plurality of modulated sub-carriers to its assigned transmitter; and
transmitting, at substantially a same time, each said plurality of modulated sub-carriers using its assigned transmitter.
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Abstract
One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver, decoded and compared to known values to provide synchronization, framing, channels estimation, offsets and other corrections to the transmitted signal.
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Citations
26 Claims
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1. A method of configuring a preamble portion of a data signal for transmission over a plurality of sub-carriers by at least two antennas of a transmitter device, said method comprising:
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assigning a respective pseudo-noise (PN) code to each of said at least two antennas; assigning each of said plurality of sub-carriers to a respective one of said at least two antennas; modulating each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two antennas as said each of said plurality of sub-carriers such that a plurality of modulated sub-carriers are obtained that are each assigned to a respective one of said at least two antennas; delivering each of said plurality of modulated sub-carriers to its assigned transmitter; and transmitting, at substantially a same time, each said plurality of modulated sub-carriers using its assigned transmitter. - View Dependent Claims (2, 3, 4)
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5. A method of configuring a preamble portion of a data signal for transmission over a plurality of sub-carriers by at least two transmitter devices each having at least two antennas, said method comprising:
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assigning a respective pseudo-noise (PN) code to each or said at least two antennas; assigning each of said plurality of sub-carriers to a respective one of said at least two transmitter devices; modulating each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two transmitter devices to which said each of said plurality of sub-carriers is assigned such that a plurality of modulated sub-carriers are obtained that arc each assigned to a respective one of said at least transmitter two devices; and transmitting, at substantially a same time, each of said plurality of modulated sub-carriers using each of said at least two antennas of its assigned transmitter device. - View Dependent Claims (6, 7, 8)
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9. An apparatus for configuring a preamble portion of a data signal for transmission over a plurality sub-carriers by at least two antennas of a transmitter device, said apparatus comprising:
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a preamble insertion circuit configured to; assign a respective pseudo-noise (PN) code to each of said at least two antennas; assign each of said plurality of sub-carriers to a respective one of said at least two antennas; and modulate each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two antennas as said each of said plurality of sub-carriers such that a plurality of modulated sub-carriers are obtained that are each assigned to a respective one of said at least two antennas; and a coding circuit configured to deliver each of said plurality of modulated sub- carriers to its assigned transmitter; said transmitter antenna being configured to transmit, at substantially a same time, each said plurality of modulated sub-carriers using its assigned transmitter. - View Dependent Claims (10, 11, 12)
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13. An apparatus for configuring a preamble portion of a data signal for transmission over a plurality of sub-carriers by at least two transmitter devices each having at least two antennas, said apparatus comprising:
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a preamble insertion circuit configured to; assign a respective pseudo-noise (PN) code to each of said at least two antennas; assign each of said plurality of sub-carriers to a respective one of said at least two transmitter devices; and modulate each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two transmitter devices to which said each of said plurality of sub-criers is assigned such that a plurality of modulated sub-carriers are obtained tat are each assigned to a respective one of said at least two transmitter devices; said at least two antennas of said at least two transmitter devices being configured to transmit, at substantially a same time, each of said plurality of modulated sub-carriers using each of said at least two antennas of its assigned transmitter device. - View Dependent Claims (14, 15, 16)
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17. An apparatus for configuring a preamble portion of a data signal for transmission over a plurality of sub-carriers by at least two antennas of a transmitter device, said apparatus comprising:
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means for assigning a respective pseudo-noise (PN) code to each of said at least two antennas; means for assigning each of said plurality of sub-carriers to a respective one of said at least two antennas; means for modulating each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two antennas as said each of said plurality of sub-carriers such that a plurality of modulated sub-carriers are obtained that are each assigned to a respective one of said at least two antennas; means for delivering each of said plurality of modulated sub-carriers to its assigned transmitter; and means for transmitting, at substantially a same time, each said plurality of modulated sub-carriers using its assigned transmitter.
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18. An apparatus for configuring a preamble portion of a data signal for transmission over a plurality of sub-carriers by at least two transmitter devices each having at least two antennas, said apparatus comprising:
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means for assigning a respective pseudo-noise (PN) code to each of said at least two antennas; means for assigning each of said plurality of sub-carriers to a respective one of said at least two transmitter devices; means for modulating each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two transmitter devices to which said each of said plurality of sub-carriers is assigned such that a plurality of modulated sub-carriers are obtained that arc each assigned to a respective one of said at least two transmitter devices; and means for transmitting, at substantially a same time, each of said plurality of modulated sub-carriers using each of said at least two antennas of its assigned transmitter device.
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19. A readable medium comprising:
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instructions for configuring a preamble portion of a data signal for transmission over a plurality of sub-carriers by at least two antennas of a transmitter device, said instructions comprising; instructions for assigning a respective pseudo-noise (PN) code to each of said at least two antennas; instructions for assigning each of said plurality of sub-carriers to a respective one of said at least two antennas; instructions for modulating each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two antennas as said each of said plurality of sub-carriers such tat a plurality of modulated sub-carriers are obtained that are each assigned to a respective one of said at least two antennas; instructions for delivering each of said plurality of modulated sub-carriers to its assigned transmitter; and instructions for transmitting, at substantially a same time, each said plurality of modulated sub-carriers using its assigned transmitter. - View Dependent Claims (20, 21, 22)
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23. A readable medium comprising:
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instructions for configuring a preamble portion of a data signal for transmission over a plurality of sub-carriers by at least two transmitter devices each having at least two antennas, said instructions for comprising; instructions for assigning a respective pseudo-noise (PN) code to each of said at least two antennas; instructions for assigning each of said plurality of sub-carriers to a respective one of said at least two transmitter devices; instructions for modulating each of said plurality of sub-carriers as a function of said respective pseudo-noise (PN) code that is assigned to a same one of said at least two transmitter devices to which said each of said plurality of sub-carriers is assigned such that a plurality of modulated sub-carriers are obtained that are each assigned to a respective one of said at least transmitter devices; and instructions for transmitting, at substantially a same time, each of said plurality of modulated sub-carriers using each of said at least two antennas of its assigned transmitter device. - View Dependent Claims (24, 25, 26)
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Specification