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Modified preamble structure for IEEE 802.11a extensions to allow for coexistence and interoperability between 802.11a devices and higher data rate, MIMO or otherwise extended devices

  • US 7,599,332 B2
  • Filed: 05/27/2005
  • Issued: 10/06/2009
  • Est. Priority Date: 04/05/2004
  • Status: Active Grant
First Claim
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1. A method for transmitting a training sequence, the method comprising:

  • transmitting from at least first and second transmit antennas of a wireless communications system at least first and second preambles configured respectively for transmission from said at least first and second transmit antennas, each of the at least first and second preambles further comprising;

    a short training sequence field;

    a guard interval field;

    a long training sequence field; and

    a signal field;

    wherein the short training sequence field of the second preamble has a cyclic shift with respect to the short training sequence field of the first preamble;

    wherein the long training sequence field of the second preamble has a cyclic shift; and

    wherein the signal field of the second preamble has a cyclic shift with respect to the signal of the first preamble.

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