Method and apparatus for supporting transmit diversity in a receiver

In a wireless communication system including a transmitter having a plurality of transmit antennas and a receiver having at least one receive antenna, wherein the transmitter transmits different pilot code sequences via each of the transmit antennas, a method for supporting transmit diversity in the receiver, the method comprising:

• receiving signals transmitted by the transmitter;
• generating a sample stream based on the received signals;
• constructing a plurality of interference signals, wherein each interference signal is associated with one of the transmit antennas and is used for canceling a pilot code sequence transmitted from all of the other transmit antennas;
• subtracting each of the interference signals from the sample stream to generate a plurality of interference cancelled sample streams;
• performing equalization of each of the interference cancelled sample streams to generate a plurality of equalized sample streams, each equalization being associated with one of the transmit antennas and being performed using a corresponding pilot code sequence;
• despreading the equalized sample streams to generate despread data streams;
• and
• performing transmit diversity decoding on the despread data streams.

In a wireless communication system including a transmitter having a plurality of transmit antennas and a receiver, wherein the transmitter transmits different pilot code sequences via each of the transmit antennas, the receiver for supporting transmit diversity, the receiver comprising:

• at least one receive antenna for receiving signals transmitted from the transmitter;
• a sampling unit for generating a sample stream based on the received signals;
• and
• a plurality of equalizers for processing the sample stream to generate a plurality of equalized sample streams, each equalizer being associated with one of the transmit antennas and processing the sample stream using a corresponding pilot code sequence while treating transmissions from all of the other transmit antennas as interference;
• a plurality of despreaders for despreading the equalized sample streams to generate a plurality of despread data streams;
• and
• a transmit diversity decoder for performing transmit diversity decoding on the despread data streams.

In a wireless communication system including a transmitter having a plurality of transmit antennas and a receiver, wherein the transmitter transmits different pilot code sequence via each of the transmit antennas, a receiver for supporting transmit diversity, the receiver comprising:

• at least one receive antenna for receiving signals transmitted from the transmitter;
• a sampling unit for generating a sample stream based on the received signals;
• a plurality of interference construction units for constructing interference signals, each interference construction unit being associated with one of the transmit antennas and configured to construct an interference signal for canceling pilot code sequence transmitted via all of the other transmit antennas except the associated transmit antenna;
• a plurality of subtractors, each subtractor being coupled to one of the interference construction units for subtracting a corresponding interference signal from the sample stream;
• a plurality of equalizers, each equalizer being associated with one of the transmit antennas and processing an associated interference cancelled sample stream to generate an equalized sample stream,
• a plurality of despreaders, each despreader for despreading an output of corresponding equalizer to generate a despread data stream;
• and
• a transmit diversity decoder for performing transmit diversity decoding on the despread data streams.