Telecommunications – Receiver or analog modulated signal frequency converter – Measuring or testing of receiver
Reexamination Certificate
1998-07-08
2001-12-11
Urban, Edward F. (Department: 2683)
Telecommunications
Receiver or analog modulated signal frequency converter
Measuring or testing of receiver
C455S226300, C375S349000
Reexamination Certificate
active
06330431
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to a method, primarily for use in a digital mobile radio communications system, for forming a quality measure of a signal burst. The invention relates also to a radio receiver which utilises the method.
DESCRIPTION OF RELATED ART
WO94/05100 discloses a method for forming a signal quality measure of a signal burst received in a receiver. The method comprises using a channel estimator to form an estimate of the energy of the useful signal contained in the received signal vector, and forming an estimate of the energy of the remaining signal components of the signal vector, and forming the burst quality measure based on the two estimates.
However, this method has the disadvantage that the error signal is the sum of noise components of the received signal, and of received interference signals. As a result, it is not possible to obtain measurements of the burst quality with respect to the signal to noise ratio, or of the burst quality with respect to the signal to interferer ratio.
There is known from WO96/04738 a method of Interference Rejection Combining, for use in a multi-antenna digital cellular communications system. In such a method, an impairment correlation matrix is used to provide an estimate of impairment correlation properties for use in demodulating radio signals received by a plurality of antennas.
SUMMARY OF THE INVENTION
The present invention seeks to provide a method of obtaining measurements of the burst quality, with respect to the signal to noise ratio and the signal to interferer ratio respectively.
In particular, the invention relates to the use of an inverse impairment correlation matrix to obtain the necessary parameters, and to the use of specific algorithms for calculating the burst quality.
The invention relates also to a radio receiver which carries out the method.
Preferred embodiments of the invention provide methods, and radio receivers, which can provide separate measurements of the burst quality with respect to the signal to noise ratio and the signal to interferer ratio.
REFERENCES:
patent: 4835790 (1989-05-01), Yoshida et al.
patent: 5450623 (1995-09-01), Yokoyama et al.
patent: 5465412 (1995-11-01), Mueller et al.
patent: 5506869 (1996-04-01), Royer
patent: 5822380 (1998-10-01), Bottomley
patent: 6028894 (2000-02-01), Oishi et al.
patent: 94/05100 (1994-03-01), None
patent: 96/04738 (1996-02-01), None
Rostamy Jafar
Wahlstrom Peter
Burns Doane Swecker & Mathis L.L.P.
Telefonaktiebolaget LM Ericsson (publ)
Urban Edward F.
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