System and method for modifying peak-to-average power ratio in CDMA transmitters

A wireless communication network comprising:

• a plurality of base stations capable of communicating with a plurality of mobile stations disposed in a coverage are of said plurality of base stations;
• and
• a CDMA transmitter associated with at least one of said plurality of base stations, said CDMA transmitter comprising:
• a first baseband combiner capable of receiving N baseband chip streams, each of said N baseband chip streams comprising a sequence of chips, each chip having one of a positive amplitude value and a negative amplitude value, wherein said first baseband combiner combines chips from corresponding time slots in each of said N baseband chip streams to thereby generate a first composite baseband chip sequence;
• a data processor coupled to said first baseband combiner capable of detecting a first peak amplitude in said first composite baseband chip sequence that exceeds a pre-determined maximum threshold and determining an amplitude and a polarity of a first compensation pulse associated with said first peak amplitude;
• and
• a pulse generator coupled to said data processor capable of generating said first compensation pulse having said amplitude and said polarity determined by said data processor, wherein said first baseband combiner receives said first compensation pulse and combines said first compensation pulse with said first composite baseband chip sequence during a chip time slot corresponding to said first peak amplitude.

A method of processing baseband chip streams in a CDMA transmitter, the method comprising the steps of:

• receiving N baseband chip streams, each of the N baseband chip streams comprising a sequence of chips, each chip having one of a positive amplitude value and a negative amplitude value;
• combining chips from corresponding time slots in each of the N baseband chip streams to thereby generate a first composite baseband chip sequence;
• detecting a first peak amplitude in the first composite baseband chip sequence that exceeds a pre-determined maximum threshold;
• determining an amplitude and a polarity of a first compensation pulse associated with the first peak amplitude;
• generating the first compensation pulse having the determined amplitude and polarity;
• and
• combining the first compensation pulse with the first composite baseband chip sequence during a chip time slot corresponding to the first peak amplitude.