Method and system for the dynamic modification of control paremeters in a transmitter power control system
First Claim
1. In a communications system having a first station and a remotely located second station, said second station transmitting at a predetermined power level a communication signal comprised of frames of data each encoded at a predetermined one of a plurality of data rates, said second station receiving power level information from said first station and responsive thereto for adjusting said power level, a method for controlling said power level, comprising the steps of:
- receiving said communication signal at said first station;
measuring a power level of said received communication signal;
producing a rate decision for each frame of data in said received communication signal;
producing power level information in response to said rate decision and said measured power level; and
transmitting said power level information to said second station.
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Accused Products
Abstract
In a communication system in which direct sequence spread spectrum modulation techniques are used interference is generated in communications by remote stations since the communications share the same frequency spectrum. In order to increase system capacity the power level of the remote station transmitters are controlled by the local station. A setpoint is generated by the local station and compared with the remote station signal strength measured at the local station. The result of this comparison is used to generate power level adjustment commands which are sent to the remote station. The remote station is responsive to the power level adjustment commands for increasing or decreasing remote station transmitter power. In a spread spectrum communication system in which data is encoded at variable data rates, the local station determines the rate at which received data was encoded by the transmitting remote station. The data is decoded at each possible rate with error metrics generated that are representative of the quality of the data decoded at each rate. A rate decision algorithm is used to evaluate the error metrics and make a decision on the rate at which the data was transmitted. A pattern match of rate decisions is used to modify a setpoint so as to closely control the transmitting power of the remote station as a function of the quality of the received data.
380 Citations
22 Claims
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1. In a communications system having a first station and a remotely located second station, said second station transmitting at a predetermined power level a communication signal comprised of frames of data each encoded at a predetermined one of a plurality of data rates, said second station receiving power level information from said first station and responsive thereto for adjusting said power level, a method for controlling said power level, comprising the steps of:
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receiving said communication signal at said first station; measuring a power level of said received communication signal; producing a rate decision for each frame of data in said received communication signal; producing power level information in response to said rate decision and said measured power level; and transmitting said power level information to said second station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. In a communication system in which a first transceiver controls transmission signal power of a second transceiver transmitted communication signal comprised of frames of variable rate data by measuring and comparing a level of signal power of said communication signal with a setpoint power level to generate and communicate power adjustment commands to said second transceiver which is responsive thereto for adjusting signal power in said communication signal, said first transceiver estimating a data rate for each frame of data in said communication signal and providing a corresponding rate decision, a method for adjusting said setpoint power level comprising the steps of:
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determining from a set of rate decisions a matching to a predetermined rate decision pattern; and modifying said setpoint power level according to a modification parameter when the matching to said predetermined rate decision pattern is determined. - View Dependent Claims (15, 16, 17)
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18. In a communications system having a first station and a remotely located second station, said second station transmitting at a predetermined power level a communication signal comprised of frames of data each encoded at a predetermined one of a plurality of data rates, said second station receiving power level information from said first station and responsive thereto for adjusting said power level, the system for controlling said power level, comprising:
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means for determining a power level of said communication signal as received at said first station; means for producing a rate decision for each frame of data in said received communication signal; means for producing power level information in response to said rate decision and said determined power level; and means for transmitting said power level information to said second station. - View Dependent Claims (19, 20, 21, 22)
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Specification