Transmit processing using receiver functions

Abstract

A method and apparatus for transmitting data in code division multiple access communications. The method includes processing spread first data with a channel response matrix using an equalization circuit to pre-equalize the spread data to compensate for a channel response prior to transmission. The pre-equalized data is received and recovered by a receiver. Second data, transmitted from the receiver, is received and recovered using the equalization circuit to equalize the second data to compensate for a channel response that the first data encountered.

What is claimed is: 
     
         1 . A wireless transmit/receive unit (WTRU) configured for multiple input multiple output (MIMO) communications, the WTRU comprising:
 a processor configured to derive channel state information from at least one received signal;   the processor configured to determine a channel response matrix based on the channel state information;   the processor configured to process a plurality of data streams with the channel response matrix to pre-equalize the plurality of data streams to compensate for channel impairments; and   a transmitter configured to transmit the pre-equalized plurality of data streams.   
     
     
         2 . The WTRU of  claim 1  wherein the channel state information is gathered in a downlink time slot for a subsequent uplink transmission slot. 
     
     
         3 . A method for use in a wireless transmit/receive unit (WTRU) for multiple input multiple output (MIMO) communications, the method comprising:
 receiving channel state information;   determining a channel response matrix based on the received channel state information;   processing a plurality of data streams with the channel response matrix to pre-equalize the plurality of data streams to compensate for channel impairments; and   transmitting the pre-equalized plurality of data streams.   
     
     
         4 . The method of  claim 3  wherein the channel state information is gathered in a downlink time slot for a subsequent uplink transmission slot.