Blind signal separation using spreading codes

A method for operating a communications device for separating source signals provided by M signal sources, the communications device comprising an antenna array, a code decoder connected to the antenna array, a receiver assembly connected to the code decoder, and a blind signal separation processor connected to the receiver assembly, the method comprising:

• receiving at the antenna array at least N different summations of-the M source signals, the antenna array comprising N antenna elements;
• decoding by the decoder the at least N different summations of the M source signals, each one of the N different summations including k codes for providing k different summations of the M source signals associated therewith;
• providing the at least kN different summations of the M source signals to the receiver assembly;
• and
• processing by the blind signal separation processor the at least kN different summations of the M source signals, the processing comprising
• forming a mixing matrix comprising the at least kN different summations of the M source signals, the mixing matrix having a rank equal up to kN, and
• separating desired source signals from the mixing matrix.