Patent ID: 7362269

Claim:
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 comprising an 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, and a 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.