Diversity method, a radio receiver and a radio system

Details Diversity method, a radio receiver and a radio system Diversity method, a radio receiver and a radio system

1997-04-16

2000-02-22

To, Doris H.

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

455134, 4552771, H04B 702

Patent

active

060290579

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.

REFERENCES:
patent: 4856080 (1989-08-01), Hulkko
patent: 5119501 (1992-06-01), Perry et al.
patent: 5276920 (1994-01-01), Kuisma
patent: 5548837 (1996-08-01), Hess et al.
patent: 5561673 (1996-10-01), Takai et al.
patent: 5684793 (1997-11-01), Kiema et al.
patent: 5740526 (1998-04-01), Bonta et al.

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