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Patent EP0457460A2 successfully refreshed from Google Patents.
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EP0457460A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Spacediversity switching receiver

Assignee: Orbitel Mobile Communications Ltd
•
Filing: 1991-05-01
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Granted: —
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Expires: 2011-05-01
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Abstract

Abstract A receiver system for a mobile telephone system comprises two or more antenna (A1,A2) spaced a distance apart from each other greater than the wavelength of incident radiation, preferably at least about the order of ten times the wavelength of the incident radiation, and a receiver. Each antenna (A1,A2) is coupled to a respective receiver channel (22,24) of the receiver, each receiver channel comprising an RF means (26) for processing the received signals, and equaliser means for equalising and/or decoding the signals from the RF means. The equaliser means includes metric generating means (40) for generating metric information which provides probability measures for a sequence of time intervals and for a multiplicity of possible states of the receiver within each time interval that the received signal has put the receiver into the respective states, and selector means for comparing the values of corresponding metrics from respective receiver channels for selecting received data from the receiver channel (22 or 24) having the higher probability of accuracy.

Inventors

  • 👤 Hamid Amir-Alikhani

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 15:47
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/02; H04L1/06

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 166 words
A receiver system for a mobile telephone system comprising two or more antenna (A1,A2) spaced a distance apart from each other greater than the wavelength of incident radiation, preferably at least about the order of ten times the wavelength of the incident radiation, a receiver, each antenna (A1,A2) being coupled to a respective receiver channel (22,24) of the receiver, each receiver channel (22,24) comprising an RF means (26) for processing the received signals, equaliser means (30) for equalising and/or demodulating the signals from the RF means (26), the equaliser means including metric generating means (40) for generating metric information which provides probability measures for a sequence of time intervals and for a multiplicity of possible states of the receiver within each time interval, that the received signal has put the receiver into the respective states, and selector means (48) for comparing the values of corresponding metrics from respective receiver channels (22,24) for selecting received data from the receiver channel (22,24) having the higher probability of accuracy.
Claim 2
Dependent Claim 31 words
A receiver system as claimed in claim 1 wherein said metric information comprises an accumulated cost metric representing the Hamming distance associated with the most likely sequence of a message sequence.
Claim 3
Dependent Claim 53 words
A receiver system as claimed in claim 1 or 2 wherein said metric information comprises a branch metric, for each receiver state at each time interval, which provides a measure of the probability that the receiver entered that state from one of n possible routes from receiver states in the preceding time interval.
Claim 4
Dependent Claim 25 words
A receiver system as claimed in claim 3 wherein the metric information comprises the difference between the metrics computed for the routes entering each state.
Claim 5
Dependent Claim 27 words
A receiver system as claimed in any preceding claim wherein the metric information gathered from the equalisation process is employed to select the appropriate receiver channel (22,24).
Claim 6
Dependent Claim 39 words
A receiver system as claimed in claim 2 wherein the message sequence comprises a block of data (57) on one side of the training sequence (26) in a time slot of a TDMA frame of a mobile telephone system.
Claim 7
Dependent Claim 15 words
A receiver system as claimed in any preceding claim incorporated in a mobile telephone system.

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