Transmission power control device in a radio communication transmitting/receiving station
First Claim
1. A transmission power control device in a radio communication transmitting and receiving station, comprising:
- means for measuring power of a signal received by said station at predetermined instants,means for estimating at each predetermined instant a signal power which will be received by said station at a next predetermined instant, as a function of said measured power, thereby producing an estimated power,said estimating means comprising subtractor means for computing a difference in said measured signal power received at a predetermined instant and the estimated power of the received and measured power, means for multiplying a power difference by a predetermined factor less than 1, thereby deriving a product, adder means for adding said product of said power difference and said factor to said estimated power of the received and measured power so as to establish said estimated power of the power which will be received and measured at the next instant, and means for memorizing said next instant estimated power during a time interval between the two instants, thereby applying it to said adder and subtractor means at said next instant, andmeans for reducing a signal power transmitted by said station between successive instants, in proportion to said estimated power.
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Accused Products
Abstract
The power transmitted by an r.f. transmitting and receiving station, such as a mobile station, to a fixed base station, is controlled as a function of power received by the mobile station to obtain a constant receiving power level in the fixed station despite variations in the relative location of the stations. The power received by the mobile station is measured and sampled at predetermined instants. At each predetermined instant, the power to be received by the mobile station at a following predetermined instant is estimated as a function of the measured power, to derive an estimated power. R.f. signal power transmitted by the mobile station is reduced between the successive instants in proportion to the estimated power.
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Citations
17 Claims
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1. A transmission power control device in a radio communication transmitting and receiving station, comprising:
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means for measuring power of a signal received by said station at predetermined instants, means for estimating at each predetermined instant a signal power which will be received by said station at a next predetermined instant, as a function of said measured power, thereby producing an estimated power, said estimating means comprising subtractor means for computing a difference in said measured signal power received at a predetermined instant and the estimated power of the received and measured power, means for multiplying a power difference by a predetermined factor less than 1, thereby deriving a product, adder means for adding said product of said power difference and said factor to said estimated power of the received and measured power so as to establish said estimated power of the power which will be received and measured at the next instant, and means for memorizing said next instant estimated power during a time interval between the two instants, thereby applying it to said adder and subtractor means at said next instant, and means for reducing a signal power transmitted by said station between successive instants, in proportion to said estimated power. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16)
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3. Apparatus for controlling the amplitude of a signal transmitted from a communication transmitting and receiving station comprising:
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means responsive to a signal received by the station for deriving a first signal having a value representing the magnitude of power of the received signal, means responsive to the value of the first signal at successive spaced intervals t, t+T, etc, for deriving a signal having values representing estimates of the power of the signal to be received by the station at successive spaced intervals t+T, t+2T, etc, said means for deriving a signal representing estimates of the signal to be received including computer means for; (a) combining the first and estimate representing signals to derive a second signal having a value representing the difference between the values of the first and estimate representing signals,
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4. (b) multiplying the second signal by a constant having a value between zero and one, to derive a third signal,
(c) combining the estimate representing and third signals to derive a fourth signal having a value representing the sum of the values of the estimate representing and third signals, the fourth signal having a value representing the estimates of the power of the signal to be received by the station at successive spaced intervals t+T, t+2T, etc,; - and
means responsive to the value of the fourth signal for controlling the amplitude of the signal transmitted by the station between the successive intervals t+T, t+2T, etc.
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15. In a radio communication transmitting and receiving station, means for receiving a radio frequency signal having variable power, means for measuring power of the signal received by said receiving means at predetermined instants thereby producing analog power samples at said predetermined instants, first means for converting said analog power samples into digital power words, digital means connected to said first converting means for deriving a digital estimated power word at each of said predetermined instants, the estimated power word at a first predetermined instant being representative of a power sample which will be produced at a second predetermined instant succeeding said first instant and being derived as a function of said digital power word provided by said first converting means at said first instant, second means for converting the digital estimated power words into analog estimated power samples, and means receiving a signal derived by said station and to be transmitted in the form of a radio frequency signal by said station for reducing the power of said derived signal in response to and in proportion to said analog estimated power samples.
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17. A method of controlling the amplitude of a signal transmitted from a communication transmitting and receiving station comprising:
deriving a first signal having a value representing the magnitude of power of a signal received by the station, responding to the value of the first signal at successive spaced intervals t, t+T, etc. to derive a signal having values representing estimates of the power of the signal to be received by the station at successive spaced intervals t+T, t+2T, etc., the signal representing estimates of the signal to be received being derived by deriving a second signal having a value representing the difference between the values of the first and estimate representing signals, multiplying the value of the second signal by a constant having a value between zero and one to derive a third signal, deriving a fourth signal having a value representing the sum of the values of the estimate representing and third signals, the fourth signal having a value representing the estimates of the power of the signal to be received by the station at successive spaced intervals t+T, t+2T, etc., and controlling the amplitude of the signal transmitted by the station between the successive intervals t+T, t+2T, etc. as a function of the value of the fourth signal.
Specification