Method and apparatus for two-user joint demodulation in a system having transmit deversity

A method of demodulating a received signal corresponding to a plurality of transmitted symbols originating from both a first user and a second user, the method comprising:

• initializing a first-user symbol corresponding to the first user and a second-user symbol corresponding to the second user and channel estimates for the first user and the second user;
• jointly detecting a first-user symbol and a second-user symbol at a current symbol time using previous first and second user symbols and channel estimates for the first user and the second user, and based on the use of transmit diversity by at least one of the first user and the second user;
• and
• if additional symbol times remain, jointly detecting the first user symbol and the second user symbol at a next symbol time.

Apparatus for demodulating a received signal corresponding to a plurality of transmitted symbol sequences originating from both a first user and a second user, the apparatus comprising:

• means for initializing a first-user symbol sequence corresponding to the first user and a second-user symbol sequence corresponding to the second user;
• means for initializing channel estimates for the first user and the second user;
• and
• means for iteratively and jointly detecting the first-user symbol sequence and the second-user symbol sequence using previous first and second user symbol sequences and the channel estimates for the first user and the second user, and based on the use of transmit diversity by at least one of the first user and the second user.

Apparatus for demodulating a received signal corresponding to a plurality of transmitted symbols originating from both a first user and a second user, the apparatus comprising:

• means for initializing a first-user symbol corresponding to the first user and a second-user symbol corresponding to the second user;
• means for initializing channel estimates for the first user and the second user;
• and
• means for jointly and recursively detecting a first-user symbol and a second-user symbol at specific symbol times using previous first and second user symbols and channel estimates for the first user and the second user, and based on the use of transmit diversity by at least one of the first user and the second user.