Multiple-user CDMA wireless communication system

Details Multiple-user CDMA wireless communication system Multiple-user CDMA wireless communication system

2006-10-03

2006-10-03

Qureshi, Afsar (Department: 2616)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S335000, C370S401000, C370S469000

Reexamination Certificate

active

07116649

ABSTRACT:
A receiver for CDMA signals, in which data intended for transmission to multiple intended receivers is spread by respective orthogonal spreading codes and scrambled by an aperiodic random scrambling code, includes a processing branch for each of a number of base stations from which the receiver may pick up CDMA signals. Each processing branch performs both channel equalisation based on a set of weights for that branch, and a decoding operation. The outputs of the branches are combined to produce a combined signal which is used both for determining the data intended for the receiver, and in a feedback loop to improve the sets of weights. The receiver is reliable even in the presence of mutipath fading and during soft handover.

REFERENCES:
patent: 5305349 (1994-04-01), Dent
patent: 6026115 (2000-02-01), Higashi et al.
patent: 6483866 (2002-11-01), Suzuki
patent: 6570918 (2003-05-01), Rademacher
patent: 6647015 (2003-11-01), Malkemes et al.
Sergio Verdu, “Minimum Probability of Error for Asynchronous Gaussian Multiple-Access Channels,” IEEE Transactions on Information Theory, vol. IT-32. pp. 85-96, Jan. 1986.
Varanasi M. K., Aazhang B., “Near-Optimum Detection in Synchronous Code-Division Multiple-Access Systems,” IEEE Transaction on Communications, vol. 39, pp. 725-736, May 1991.
Xiaodong Wang and H. Vincent Poor, Blind Multiuser Detection: A Subspace Approach,: IEEE Transactions on Information Theory, vol. 44, No. 2, Mar. 1998.
Honig M., Madhow U., Verdu S., “Blind Adaptive Multiuser Detection.” Transactions on Information Theory, vol. 41, pp. 944-960, Jul. 1995.
Markku J. Heikkila et al., “Interference Suppression in CDMA Downlink through Adaptive Channel Equalization.” IEEE Vehicular Technology Conference, 1999, pp. 978-982.
Stefan Werner, Jorma Lilleberg, “Downlink Channel Decorrelation in CDMA Systems with Long Codes.” IEEE Vehicular Technology Conference, 1999, pp. 1614-1617.
Irfan Ghauri, Dirk T. M. Slock, “Linear Receivers for the DS-CDMA Downlink Exploiting Orthogonality of Spreading Sequences.” IEEE Vehicular Technology Conference, 1998, pp. 650-654.
Hooli, K., Latva-aho, M. and Juntti, M., “Multiple Access Interference Suppression with Linear Chip Equalizers in WCDMA Downlink Receivers,” IEEE Global Telecommunications Conference, 1999, pp. 467-471.
Hooli, K., Juntti, M., and Latva-aho, M., “Inter-path Interference Suppression in WCDMA Systems with Low Spreading Factors,” IEEE Vehicular Technology Conference, 1999, pp. 421-425.

Affiliated with

Also associated with

Rating

Multiple-user CDMA wireless communication system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Multiple-user CDMA wireless communication system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multiple-user CDMA wireless communication system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3701086