Multi-user detection for antenna array receivers
First Claim
1. A multi-user detection radio communications system wherein an equivalence relation is defined for a set of users based on a set of beam-forming terms to group the users according to their spatial signatures.
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Abstract
The present invention relates to radio communication antennas and in particular relates to multi-user detection for CDMA antenna array receivers. A reverse link (mobile to base) of a cellular direct sequence code division multiple access system is provided which increases system capacity whilst avoiding system complexity. The invention provides a method of signal detection which is based on the partitioning of users into equivalence classes by beam-forming with subsequent standard multi-user detection techniques applied within each class. Computation techniques are simplified and processing time can be considerably reduced. Furthermore, the capacity of a conventional receiver may be improved by employing multi-user detection techniques. These techniques are particularly useful for systems which involve large numbers of users. A method of operation is also disclosed.
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Citations
17 Claims
- 1. A multi-user detection radio communications system wherein an equivalence relation is defined for a set of users based on a set of beam-forming terms to group the users according to their spatial signatures.
- 12. A method of operating a multi-user detection radio communications system wherein an equivalence relation is defined for a set of users based on a set of beam-forming terms wherein the users are grouped according to their spatial signatures.
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16. A multi-user detection radio receiver wherein an equivalence relation is defined for a set of users based on a set of beam-forming terms to group the users according to their spatial signatures.
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17. A method of operating a multi-user detection radio receiver wherein an equivalence relation is defined for a set of users based on a set of beam-forming terms wherein the users are grouped according to their spatial signatures.
Specification