Patent ID: 7474884
Filing Date: 2009-01-06
Classification: H04B

Abstract:
1. A method comprising: receiving branches of transmitted signal by a digital receiver exploiting second order statistics for adaptive co-channel interference rejection in wireless communication, having digitally I, in phase, and Q, quadrature, wherein a coarse synchronization and a coarse frequency offset compensation are configured to be performed on said signal, derotating the signal, and outputting a complex valued time discrete base band representation of the received signal if a used modulation form is one dimensional, else if a used modulation form is multiple dimensional then construct, from possibly two vector valued signal sequences, a complex valued signal sequence and outputting said complex valued signal; separating said output signal into its real and imaginary parts which vector is output containing the transmitted signal, co-channel interfering user signals, additive noise and other possible disturbance; estimating using the outputs and performing one or more of the following quantities: fine synchronisation, fine frequency offset estimation or compensation, or data model estimation for outputting one or more of said quantities; filtering, using the real value output and coefficients in the data model output and performing a whitening operation on the signal additionally taking into account second order properties of noise and co-channel interference; and detecting transmitted symbols, and making use of the output and the data model, thereby improving co-channel rejection in wireless communication, thus making it possible to increase the number of channels for frequencies used.