Legacy compatible spatial multiplexing systems and methods
First Claim
Patent Images
1. A method comprising:
- generating a first packet comprising two copies of a long training symbol;
generating a second packet comprising a cyclically-shifted long training symbol and an inverted version of the cyclically-shifted long training symbol;
transmitting the first packet from a first antenna; and
transmitting the second packet from a second antenna.
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Abstract
Embodiments of legacy compatible spatial multiplexing systems and methods are disclosed. One method embodiment, among others, comprises receiving long training symbols and cyclic shifted long training symbols corresponding to legacy preamble portions of packets corresponding to first and second transmit signals, receiving long training symbols and inverted cyclic shifted long training symbols corresponding to spatial multiplexing portions of packets corresponding to first and second transmit signals, and combining the symbols corresponding to the first and second transmit antennas to estimate the respective channels.
42 Citations
37 Claims
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1. A method comprising:
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generating a first packet comprising two copies of a long training symbol; generating a second packet comprising a cyclically-shifted long training symbol and an inverted version of the cyclically-shifted long training symbol; transmitting the first packet from a first antenna; and transmitting the second packet from a second antenna. - View Dependent Claims (2, 3, 4, 5)
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6. A method, comprising:
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receiving a first packet on a first channel at an antenna, wherein the first packet comprises two copies of a long training symbol; receiving a second packet on a second channel at the antenna, wherein the second packet comprises a cyclically-shifted long training symbol and an inverted version of the cyclically-shifted long training symbol; and determining a channel estimate for the first and second transmission channels based on the two copies of the long training symbol, the cyclically-shifted long training symbol, and the inverted version of the cyclically-shifted long training symbol. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A system, comprising:
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a first transmit processor configured to generate a first packet comprising two copies of a long training symbol; and a second transmit processor configured to generate a second packet comprising a cyclically-shifted long training symbol and an inverted version of the cyclically-shifted long training symbol. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A system, comprising:
a receive processor configured to determine a channel estimate for a first and second channel based on a first packet received on the first channel from a first antenna and a second packet received on the second channel from a second antenna, wherein the first packet comprises two copies of a long training symbol, and wherein the second packet comprises a cyclically-shifted long training symbol and an inverted version of the cyclically-shifted long training symbol. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A communication system comprising:
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A first antenna and a second antenna; A first transmit processor means for generating a first packet comprising two copies of a long training symbol wherein the first transmit processor means for generating a first packet is communicatively coupled to said first antenna to transmit the first packet; and
a second transmit processor means for generating a second packet comprising a cyclically-shifted long training symbol and an inverted version of the cyclically-shifted long training symbol, wherein the second transmit processor means for generating a second packet is communicatively coupled to said second antenna configured to transmit the second packet. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35, 36, 37)
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Specification