Space time transmit diversity for tdd/wcdma systems

Transmitter circuitry for a code division multiple access system comprising:

• A. a first set of data symbol leads;
• B. a second set of data symbol leads;
• C. space time transmit diversity circuits, each diversity circuit having an input connected with one lead of the first set of data symbol leads and having a first output and a second output;
• D. multiplier circuits, each multiplier circuit having an input and an output, a first set of multiplier circuits having each of their inputs connected with the first output of one diversity circuit, a second set of multiplier circuits having each of their inputs connected with the second output of one diversity circuit, and a third set of multiplier circuits having each of their inputs connected with one of the second set of data symbol leads;
• E. first summation circuitry having plural inputs connected with the outputs of the first and third sets of multiplier circuits and an output;
• F. a first antenna connected with the output of the first summation circuitry;
• G. second summation circuitry having plural inputs connected with the outputs of the second set of multiplier circuits and an output;
• and
• H. a second antenna connected with the output of the second summation circuitry.