Systems and methods for increasing the effectiveness of digital pre-distortion in electronic communications
View Patent ↗Various embodiments of communication systems and methods in which the communication system is operative to find, record, and use sets of pre-distortion parameters in conjunction with a pre-distortion procedure, in which each set of pre-distortion parameters is operative to specifically counter distortions produced in a power amplifier by a specific combination of level of input signal power and level of analog gain associated with a transmission path of the communication system. In some embodiments, there is a modulator, a transmission chain, a distortion analysis mechanism, and a pre-distortion mechanism, operative to analyze and modify signals so as to counter signal distortion.
1. A communication system comprising:
a transmission chain having a variable gain, said transmission chain receiving a transmission signal having a variable power level and producing an output signal, said transmission chain utilizing measured distortions in said output signal to select said variable gain and said variable power level from a plurality of settings to counter distortions to said transmission signal produced in said transmission chain;
wherein each of said plurality of settings comprise a gain setting and a power level setting associated with one of a plurality of previously measured distortions; and
an antenna for transmitting said output signal.
2. The system of claim 1 , further comprising a memory configuration to facilitate recording and extraction of said plurality of settings.
3. The system of claim 2 , wherein said memory configuration comprises a plurality of records, each of said plurality of records comprising:
a combination of said gain setting and said power level setting, and said previously measured distortion.
4. A method for controlling distortion in a communications system, the method comprising:
receiving a transmission signal at an input to a transmission chain having a variable gain, said transmission signal having a variable power level;
measuring a plurality of distortion levels in an output signal of said transmission chain to determine a plurality of settings, each of said plurality of settings comprising a gain setting and a power level setting, each of said plurality of settings associated with one of said plurality of distortion levels;
measuring distortions in said output signal of said transmission chain to select one of said plurality of settings to adjust said variable gain and said variable power level to reduce said measured distortion; and
transmitting said output signal with an antenna.
5. The method of claim 4 , further comprising recording said plurality of settings in a memory configuration.
6. The method of claim 5 , wherein said memory configuration comprises a plurality of records, each of said plurality of records comprising:
a combination of said gain setting and said power level setting, and said measured distortion.