Title :
Iterative weighted interference cancellation for CDMA systems with RAKE reception
Author :
Nambiar, Rajiv ; Goldsmith, Andrea
Author_Institution :
California Inst. of Technol., Pasadena, CA, USA
Abstract :
The performance of CDMA systems can be severely degraded by interference, including both intersymbol interference (ISI) and the interference between users (co-channel interference) due to the non-orthogonality of the PN codes. We consider a system that uses a RAKE receiver along with a weighted iterative interference cancellation (IC) scheme to combat both ISI and co-channel interference. The resultant decoding scheme offers significant performance improvement over a conventional RAKE receiver with a complexity much less than that of maximum-likelihood decoding. We discuss the features and advantages of our proposed scheme and also provide simulation results for its BER performance for different numbers of users and weighting factors
Keywords :
AWGN channels; cochannel interference; code division multiple access; error statistics; intersymbol interference; iterative methods; land mobile radio; multipath channels; multiuser channels; phase shift keying; pseudonoise codes; radio receivers; spread spectrum communication; AWGN channel; BER performance; BPSK; CDMA systems; ISI; RAKE receiver; RAKE reception; additive white Gaussian noise channel; binary phase-shift keying; co-channel interference; decoding; exponential delay profile; intersymbol interference; iterative weighted interference cancellation; maximum-likelihood decoding; multipath channel; non-orthogonal PN codes; performance improvement; simulation results; weighting factors; Bit error rate; Degradation; Fading; Interchannel interference; Interference cancellation; Intersymbol interference; Iterative decoding; Maximum likelihood decoding; Multiaccess communication; Multipath channels;
Conference_Titel :
Vehicular Technology Conference, 1999 IEEE 49th
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-5565-2
DOI :
10.1109/VETEC.1999.780544
