Diversity method, a radio receiver and a radio system
First Claim
1. In a radio communications system, said system including multiple antennae for receiving signals and a control processor for identifying said antennae and processing said signals, and in which the typical duration of fadeouts in said system is in the magnitude of seconds, a method of assigning an antenna to receive a signal comprising the steps of:
- measuring a parameter of the signal representative of signal quality;
storing a simulation model for said measured parameter in said control processor;
predicting the value of said measured parameter for subsequent periods of operation from the measured parameter, based on said model;
setting a value for said parameter at which antenna selection should be made;
comparing the predicted value to the set value; and
assigning said signal to an antenna based on the difference between said predicted value and said set value.
1 Assignment
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Accused Products
Abstract
The present invention relates to a diversity method in a radio system in which fadeouts are slow, such as a WLL system. The duration of fadeouts is typically in the magnitude of seconds. A radio receiver (4) according to the present invention is characterized in that the expected quality of a signal is predicted (9) for a specific interval to come based on the measured quality of the signal, and a signal is selected (3) based on the predicted quality of the signal. In a time-divided digital system, the quality of a signal is measured from a burst and the quality of the signal is predicted for several frames ahead, for example for 10 frames, based on the measured quality of said burst and one or more bursts preceeding said burst. The predicted quality is compared with a long-term weighted average, which may be the average over 50 frames, for example. If the predicted quality is below the weighted average, the signal is changed.
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Citations
10 Claims
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1. In a radio communications system, said system including multiple antennae for receiving signals and a control processor for identifying said antennae and processing said signals, and in which the typical duration of fadeouts in said system is in the magnitude of seconds, a method of assigning an antenna to receive a signal comprising the steps of:
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measuring a parameter of the signal representative of signal quality; storing a simulation model for said measured parameter in said control processor; predicting the value of said measured parameter for subsequent periods of operation from the measured parameter, based on said model; setting a value for said parameter at which antenna selection should be made; comparing the predicted value to the set value; and assigning said signal to an antenna based on the difference between said predicted value and said set value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a radio communication network having switching position diversity reception and in which the typical duration of fadeouts in said system is in the magnitude of seconds, a system for assigning a signal to an antenna comprising:
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a receiver for acquiring signals and measuring a parameter of the signal representative of signal quality; a processor containing modeling software constructed to predict a value of said measured parameter for subsequent periods of operation from the measured parameter; a comparator connected to compare the predicted value from said processor with a set value of said parameter stored therein; a switch for assigning a signal to an antenna in response to the difference between said predicted value and said set value.
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Specification