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EP0452289A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method of selecting the most suitable receiver antenna from two or more receiver antennas

Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1991-03-14
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Granted: —
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Expires: 2011-03-14
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Abstract

Abstract The invention relates to the selection of an antenna in a receiver of a mobile radio station which forms part of a time-multiplexed radio communication system. The signal strength of each antenna is measured in each time slot which immediately precedes the time slot intended for the station concerned, and the antenna selection is effected in dependence on the measured signal strengths. In order to eliminate the risk of unsuitable antenna selection as a result of momentary falls in signal strength, the signal strength for each antenna is measured on several occasions during the time slot in which the measurements take place. The signal-strength values for each antenna are thereafter combined linearly, so as to form a suitability measurement. The antenna having the highest suitability measurement is selected for the next arriving time slot.

Inventors

  • 👤 Björn Olof Peter Ekelund

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 22:44
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0817; H04B7/082

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 144 words
A method of selecting the most suitable antenna of two or more antennas in a receiver of a mobile radio station included in a time-multiplexed radio communication system for each time slot intended for the station concerned, wherein the received signal strength (s1, s2) for each antenna is measured during a time slot which immediately precedes the time slot intended for the station concerned, and wherein the selection of the antenna is effected in dependence on these signal strengths, characterized by measuring the signal strengths (s1, s2) for each of the antennas on several occasions (M) during the time slot which precedes the time slot (T) intended for the station concerned; forming a suitability measurement for each antenna by linearly combining the measured signal-strength values for each individual antenna; and by effecting antenna selection by choosing the antenna that has the highest suitability measurement.
Claim 2
Dependent Claim 62 words
A method according to Claim 1, characterized by measuring the signal strengths of the antennas over a time period (M) which is short in relation to the duration of a time slot (T); and by linearly combining the signal-strength values in a manner such that each suitability measurement is dependent on the magnitude of the signal strength and the time derivative thereof.
Claim 3
Dependent Claim 58 words
A method according to Claim 1, characterized by measuring the signal strengths of the antennas over a time period (M) which is not considerably shorter than the duration of a time slot (T); and by linearly combining the signal-strength values in a manner such that each suitability measurement is proportional to the mean values of the signal-strength values.

References Cited (Backward Citations)

US3475688A Cited
EP0318665A2 Cited

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