EP0455388A2
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Receiver
Assignee: Orbitel Mobile Communications Ltd
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Filing: 1991-04-19
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Granted: —
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Expires: 2011-04-19
Abstract
Abstract A receiver for a mobile telephone system, the receiver having a gain control means (6) coupled to receive an input burst signal and being switchable in response to the value of a gain control signal between a plurality of gain values, detector means (2) for detecting the amplitude of said input burst signal, averaging means (4) for storing the value of the detected amplitude and timing means (28) operative in response to the detection of said input signal for timing a sequence of measurements of the amplitude of the input burst signal, said averaging means (4) being operative to compute an average value of the amplitude and to provide a corresponding gain control signal for a subsequent time period.
Inventors
- 👤 Andrew William Baldwin
- 👤 Robert Norman Carter
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3052; H03G3/3078; H03G1/00; H03G1/0005; H03G1/0088; H04; H04B; H04B1/00; H04B1/06; H04B1/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
121 words
A receiver for a mobile telephone system, characterised in the receiver having a gain control means (6) coupled to receive an input burst signal and being switchable in response to the value of a gain control signal between a plurality of gain values, detector means (2) for detecting the amplitude of said input burst signal, averaging means (4) for storing the value of the detected amplitude and timing means (28) operative in response to the detection of said input signal for timing a sequence of measurements of the amplitude of the input burst signal, said averaging means (4) being operative to compute an average value of the amplitude and to provide a corresponding gain control signal for a subsequent time period.
Claim 2
Dependent Claim
17 words
A receiver according to claim 1, wherein said input burst signal comprises an RF or IF signal.
Claim 3
Dependent Claim
25 words
A receiver according to claim 1, wherein said gain control means (6) comprises a plurality of gain control amplifiers and/or attenuator networks connected in cascade.
Claim 4
Dependent Claim
23 words
A receiver according to claim 1, wherein the detector means (2) comprises a logarithmic amplifier providing an output representative of decibel signal strength.
Claim 5
Dependent Claim
23 words
A receiver according to claim 4, wherein the output of the logarithmic amplifier (2) is coupled to a flash analog to digital converter.
Claim 6
Dependent Claim
38 words
A receiver according to any preceding claim wherein the averaging means (4) comprises an accumulator arranged to store a plurality of samples of the detector means and to provide an output representing an average value of said samples.
Claim 7
Dependent Claim
39 words
A receiver according to any preceding claim wherein the output of the averaging means (4) is coupled to a converter (30) which connects the output to a gain control signal suitable for application to said gain control means (6).
Claim 8
Dependent Claim
14 words
A receiver according to claim 7 wherein the converter (5) comprises a look-up table.
Claim 9
Dependent Claim
38 words
A receiver according to any preceding claim wherein the detector means (2) includes a step detector (7) for detecting a step increase of a predetermined amount in input signal strength, representing the beginning of an input burst signal.
Claim 10
Dependent Claim
100 words
A receiver according to any preceding claim wherein the timing means (28) is operative, in response to the detection of the beginning of an input burst signal, to time said sequence of measurements, the timing means (28) including a counter (8) for incrementing in response to clock signals for stepping said averaging means (4) to store a sequence of detected amplitudes of said input signal, the timing means (28) being coupled to the averaging means (4) for holding the output of the averaging means (4) for a predetermined period, whereupon the counter (8) and the averaging means (4) are reset.
Claim 11
Dependent Claim
50 words
A receiver according to claim 10 incorporated in the base station of a GSM system and wherein the timing means (28) is operative during a random access channel time slot to carry out a measurement sequence in eight consecutive bits of a start sequence of a random access burst signal.
Claim 12
Dependent Claim
78 words
A receiver according to claim 9 incorporated in a GSM system and wherein the timing means (28) is operative during a random access channel to commence a measurement sequence in response to detection of a said step increase, and if during said measurement sequence a further said step increase is detected, said timing means (28) is operative to reset said averaging means (4) and commence a fresh measurement sequence, thereby to resolve contention between mobiles contending for access.
Claim 13
Dependent Claim
72 words
A receiver according to any preceding claim incorporated in a GSM system and wherein the timing means (28) is operative in a first mode during a random access channel to carry out a sequence of measurements on the start sequence of a random access input signal, and is operative in a second mode during a traffic channel time slot to carry out a measurement sequence over the length of the time slot.
Claim 14
Dependent Claim
38 words
A receiver according to claim 13 or any other claim, wherein said averaging means (4) includes a memory store (11) and a processor (12) for computing an average value based upon a plurality of previous input signal bursts.
Claim 15
Dependent Claim
28 words
A receiver according to claim 14 as dependant on claim 13 wherein said average value is based upon ten immediately previous time slots for the current traffic channel.
References Cited (Backward Citations)
No citation records indexed.
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