Patent ID: 7277473

Claim:
A Parallel Interference Cancellation (PIC) method, comprises, in the first stage of PIC, making multipath de-spread, channel estimation and multipath combination for a user input signal by a RAKE receiver, sending a multipath de-spread result to next stage, making estimation and cancellation of Multiple Address Interference (MAI) of the user of this stage based on a multipath combination result and a channel estimation result, and obtaining an output signal of the said user of this stage; in any middle stage of PIC, making multipath de-spread for output signal of last stage to obtain a multipath de-spread result of this stage, combining the multipath de-spread result of this stage and that of last stage of the said user to obtain a combined multipath de-spread result, sending the combined multipath de-spread result to next stage; making channel estimation and multipath combination of this stage based on the combined multipath de-spread result, and then making estimation and cancellation of Multiple Address Interference (MAI) of this stage of the said user based on the multipath combination result and the channel estimation result of this stage, and obtaining an output signal of the said user of this stage; in the final stage of PIC, making multipath de-spread for output signal of last stage to obtain a multipath de-spread result of this stage, combining the multipath de-spread result of this stage and that of said last stage of the said user to obtain a combined multipath de-spread result, making channel estimation and multipath combination based on the combined multipath de-spread result to obtain a soft output of the said user.