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Undulating transmit patterns to support signal separation at a receiver

  • US 7,362,269 B2
  • Filed: 12/19/2006
  • Issued: 04/22/2008
  • Est. Priority Date: 09/23/2004
  • Status: Expired due to Fees
First Claim
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1. A communications system comprising:

  • at least one fixed transmitter for transmitting a source signal defined by a character set comprising a plurality of symbols, and at least one of the symbols in the character set being transmitted at a different power level so that the transmitted source signal appears with L linearly independent power level time periods, where L≧

    2; and

    a mobile wireless communications device for separating source signals provided by M signal sources, where M≧

    2, and with said at least one transmitter providing one of the M source signals with the L linearly independent power level time periods, said wireless communications device comprisingan antenna array comprising N antenna elements for receiving at least N different summations of the M source signals, where N≧

    1,a receiver coupled to said antenna array for receiving the at least N different summations of the M source signals, anda signal separation processor coupled to said receiver for forming a mixing matrix comprising the at least N different summations of the M source signals, the mixing matrix having a rank equal to at least L*N, said signal separation processor for separating desired source signals from the mixing matrix.

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