US 7,321,581 B2
Method of double weighting parallel interference cancellation
Limei Wei, Shenzhen (China); Guolin Wang, Shenzhen (China); and Yu Jin, Shenzhen (China)
Assigned to Huawei Technologies Co., Ltd., (China)
Appl. No. 10/492,096
PCT Filed Oct. 09, 2002, PCT No. PCT/CN02/00711
§ 371(c)(1), (2), (4) Date Apr. 08, 2004,
PCT Pub. No. WO03/032545, PCT Pub. Date Apr. 17, 2003.
Claims priority of application No. 01 1 35527 (CN), filed on Oct. 09, 2001.
Prior Publication US 2004/0246927 A1, Dec. 09, 2004
Int. Cl. H04B 7/216 (2006.01)
U.S. Cl. 370—342  [375/144] 10 Claims
OG exemplary drawing
 
1. A double weighting parallel interference cancellation method that can be used in a CDMA mobile communication system, comprises:
(a) Making a multi-path despreading, channel estimation and a multi-path combining on an input signal of a user by a RAKE receiver;
(b) Making a hard decision on a result of the multi-path combining;
(c) Calculating a reliability coefficient for a result of the hard decision of each symbol by the multi-path combining result and a value of the channel estimation;
(d) Regenerating a weighted signal in chip level for the user by the hard decision result, the reliability coefficient and the channel estimation value;
(e) Estimating a multiple access interference on each user by the weighted regenerated signal in chip level inputted in parallel of each user, and setting a weight value for a interference cancellation in different stages, weighting the multiple access interference on a expected user;
(f) Subtracting the weighted multiple access interference on the expected user from a base band signal of a received signal, and obtaining an output signal of the said expected user, which is also an input signal of the said expected user in the next stage parallel interference cancellation.