Patent ID: 8385398
Filing Date: 2013-02-26
Classification: H04B,H04J,H04L

Abstract:
1. A receiver apparatus for use in a code multiplex telecommunications system with orthogonal spreading codes, said receiver apparatus comprising: a filtering branch with first equaliser means for receiving discrete time signal samples and for chip-level filtering said received signal samples; feedback means for performing a non-linear blind filtering of symbol estimates obtained in said filtering branch and feeding the filtered symbol estimates back to the first equaliser means, said feedback means comprising a despreading unit performing multiple despreading operations at only a single spreading level N, said blind filtering providing N pseudo-symbols estimates reflected from an actual symbol residing at a particular place in an OVSF hierarchy to any of its parent code or child codes; adaptation means for receiving said received signal samples via a delay means arranged for delaying said received signal samples by a time period corresponding to said pseudo symbol; and wherein said filtered symbol estimates are used by the adaptation means as desired response for adapting equaliser weights of the first equaliser means in the following symbol period.