EP0696857A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Power control apparatus for use in mobile radio systems
Assignee: Roke Manor Research Ltd
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Filing: 1995-06-24
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Granted: —
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Expires: 2015-06-24
Abstract
Abstract Rapid feedback control of transmit power for very low bit rate links is difficult because very little signal energy is available for measurement of power. However, the purpose of power control is to maintain a link error rate. By feeding back decisions from the receiving station to the transmitting station, the latter can detect errors at the receiving station. When an error is detected the transmit power is increased. When no error is detected the transmit power is reduced by a smaller amount. This maintains a constant bit error rate related to the ratio of the up and down step sizes.
Inventors
- 👤 Anthony Peter Hulbert
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 21:07
CPC Classifications
H; H04; H04W; H04W52/00; H04W52/04; H04W52/30; H04W52/36; H04W52/367; H04W52/18; H04W52/20; H04W52/362
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
96 words
Power controller apparatus for use in mobile radio systems comprising a first station for transmitting data to and receiving data from a second station, a second station for receiving data from and transmitting data to said first station, said first station comprising a data source, means for modulating the data source and means for transmitting data derived from said data source, and control means for controlling the power of the transmitting means in dependence upon data which is being transmitted from said first station to said second station, and then re-transmitted back to said first station.
Claim 2
Dependent Claim
82 words
Apparatus as claimed in claim 1, wherein the control means comprises an exclusive OR-gate arranged to receive the data from said data source at a first input thereof, and at a second input thereof arranged to receive the data returned from said second station, and in accordance with the comparison therewith, generates an output signal for controlling switching means arranged to control an input signal to an accumulator, the output of which is used to control the transmitting means in logarithmic fashion.
Claim 3
Dependent Claim
70 words
Apparatus as claimed in claim 2, wherein when the exclusive OR-gate performs the comparison, if the input bits at each of its inputs are equal, then the output will be low and the accumulator will be fed with a down-step signal, and if the input bits are different, indicating an error, the output of the OR-gate will be high and the accumulator input will be fed with an up-step signal.
Claim 4
Dependent Claim
32 words
Apparatus as claimed in any preceding claim, wherein the second station includes means for receiving data, means for modulating the data, and means for transmitting the data back to the first station.
Claim 5
Dependent Claim
56 words
Apparatus as claimed in any preceding claim, wherein said first station is arranged to detect a burst of errors in data reflected back from said second station, indicating that a carrier reference has become inverted, and said first station includes means arranged to invert data if it is transmitting to compensate for the burst of errors.
References Cited (Backward Citations)
US4228538A
Cited
JPH05189329A
Cited
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