Spread spectrum radiotelephone having adaptive transmitter gain control
First Claim
1. A method for adaptively controlling the transmitted power of a transmitter, comprising the steps of:
- setting a register means for storing a digital representation of an estimate of a value of a maximum transmitter gain signal, the register means having an output that is a representation of a maximum transmitter gain signal TX max;
deriving a transmitter gain signal TX gain from a received signal;
comparing TX max to TX gain and, if TX gain is greater than TX max,applying a first transmitter gain control signal to the transmitter that is derived from TX max, andenabling said register means to increase the stored digital representation of the estimate of the value of the maximum transmitter gain signal;
else, if TX gain is less than TX max, applying a second transmitter gain control signal to the transmitter that is derived from TX gain, anddisabling said register means from increasing the stored digital representation of the estimate of the value of the maximum transmitter gain signal.
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Accused Products
Abstract
This invention teaches a method, and circuits that operate in accordance with the method, for adaptively controlling the transmitted power of a CDMA transmitter (50, 102). The method includes the steps of: (a) presetting a register, such as a counter (112), with an estimate of a maximum transmitter gain signal, the counter having an count output that is a representation of a maximum transmitter gain signal (TX max); (b) deriving a transmitter gain signal (TX gain) from a received CDMA signal; (c) comparing TX max to TX gain and, if TX gain is greater than TX max, (d) applying a gain control signal to the transmitter that is derived from TX max, and (e) enabling the counter to increase its count; else, if TX gain is less than TX max, (f) applying a gain control signal to the transmitter that is derived from TX gain, and (g) disabling the counter from increasing its count.
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Citations
24 Claims
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1. A method for adaptively controlling the transmitted power of a transmitter, comprising the steps of:
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setting a register means for storing a digital representation of an estimate of a value of a maximum transmitter gain signal, the register means having an output that is a representation of a maximum transmitter gain signal TX max; deriving a transmitter gain signal TX gain from a received signal; comparing TX max to TX gain and, if TX gain is greater than TX max, applying a first transmitter gain control signal to the transmitter that is derived from TX max, and enabling said register means to increase the stored digital representation of the estimate of the value of the maximum transmitter gain signal; else, if TX gain is less than TX max, applying a second transmitter gain control signal to the transmitter that is derived from TX gain, and disabling said register means from increasing the stored digital representation of the estimate of the value of the maximum transmitter gain signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for adaptively limiting the transmitted power of a transmitter, comprising the steps of:
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setting a register means for storing a digital representation of an estimate of a value of a maximum transmitter gain signal, the register means having an output that is a representation of a maximum transmitter gain signal TX max; deriving a transmitter gain signal TX gain from a received signal; comparing TX max to TX gain and, if TX gain is greater than TX max, applying a first transmitter gain control signal to the transmitter that is derived from TX max; else, if TX gain is less than TX max, applying a second transmitter gain control signal to the transmitter that is derived from TX gain; generating a reference transmitted power signal indicator TXPI ref; generating, as a function of an actual transmitted power, a transmitted power signal indicator TXPI; comparing TXPI to TXPI ref and, if TXPI is greater than TXPI ref, and if the transmitter is transmitting a burst of information, decreasing the digital representation of the value of the stored estimate Of the maximum transmitter gain signal; else, and if the transmitter is transmitting a burst of information, increasing the digital representation of the value of the stored estimate of the maximum transmitter gain signal, so long as TX gain is greater than TX max.
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11. Apparatus for adaptively controlling the transmitted power of a transmitter, comprising:
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register means having an input for being set with a digital representation of an estimate of a value of a maximum transmitter gain signal, the register means having an output that is a representation of a maximum transmitter gain signal TX max; means for deriving a transmitter gain signal TX gain from a received signal; and first comparing means for comparing TX max to TX gain, said first comparing means being responsive to a condition wherein TX gain is greater than TX max for applying a first transmitter gain control signal to the transmitter that is derived from TX max and also for enabling said register means to increase the digital representation of the stored value, said first comparing means further being responsive to a condition wherein TX gain is less than TX max for applying a second transmitter gain control signal to the transmitter that is derived from TX gain and also for disabling said register means from increasing the digital representation of the stored value. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method for adaptively controlling the transmitted power of a transmitter, comprising the steps of:
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storing in a register means a digital representation of an estimate of a value of a maximum transmitter gain signal, the register means having an output TX max that is a representation of the stored digital representation; applying a gain control signal to the transmitter that is derived from TX max; generating a reference transmitted power signal indicator TXPI ref; generating, as a function of an actual transmitted power, a transmitted power signal indicator TXPI; comparing TXPI to TXPI ref; and only during a time that TXPI is indicated to be valid, selectively one of incrementing and decrementing the stored digital representation within the register means in accordance with the comparison so as to minimize a difference between TXPI and TXPI ref. - View Dependent Claims (19)
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20. A method for adaptively controlling the transmitted power of a transmitter that forms a portion of a radiotelephone that is operable in one of at least two modes of operation including a code division, multiple access (CDMA) first mode of operation and a frequency modulated (FM) second mode of operation, comprising the steps of:
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measuring an actual power that is being transmitted by the transmitter to generate a transmitted power indication signal; comparing the transmitted power indication signal to a reference signal to generate a control signal; when the radiotelephone is operating in the first mode of operation, adaptively controlling the transmitter power with a transmitter gain control signal that is formed in accordance with one of a generated power control signal, that is a combination of an open loop transmitter power control signal and a closed loop transmitter power control signal, and an adjustable power control signal that is controllably increased and decreased in accordance with the control signal and in accordance with a difference between a value of the generated power control signal and a value of the adjustable power control signal; and when the radiotelephone is operating in the second mode of operation, adaptively controlling the transmitter power with the transmitter gain control signal that is formed in accordance with only the adjustable power control signal that is controllably increased and decreased in accordance with the control signal. - View Dependent Claims (21, 22, 23, 24)
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Specification