Method and system for baseband predistortion linearization in multi-channel wideband communication systems
First Claim
1. A method of reducing adjacent channel power ratio and compensating memory effects of multi-channel wideband communication systems using multiplexing modulation techniques, the method comprising:
- generating an address from samples of a baseband input signal of a communication system;
retrieving from a memoryless lookup table an entry in accordance with the address;
pre-equalizing the baseband input signal, the pre-equalization depending on one or more magnitudes of the input signal; and
multiplying the pre-equalized baseband input signal and the lookup table entry,wherein the pre-equalization comprises multiplying a magnitude of a first delayed version of the input signal with a magnitude of a second delayed version of the input signal and further with a cross-term pre-equalizing coefficient.
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Abstract
In some embodiments, a method of reducing adjacent channel power ratio and compensating memory effects of multi-channel wideband communication systems using multiplexing modulation techniques is provided. The method includes generating an address from samples of a baseband input signal of a communication system. The method also includes retrieving from a memoryless lookup table an entry in accordance with the address. The method further includes pre-equalizing the baseband input signal, the pre-equalization depending on one or more magnitudes of the input signal. The method still further includes multiplying the pre-equalized baseband input signal and the lookup table entry.
116 Citations
23 Claims
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1. A method of reducing adjacent channel power ratio and compensating memory effects of multi-channel wideband communication systems using multiplexing modulation techniques, the method comprising:
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generating an address from samples of a baseband input signal of a communication system; retrieving from a memoryless lookup table an entry in accordance with the address; pre-equalizing the baseband input signal, the pre-equalization depending on one or more magnitudes of the input signal; and multiplying the pre-equalized baseband input signal and the lookup table entry, wherein the pre-equalization comprises multiplying a magnitude of a first delayed version of the input signal with a magnitude of a second delayed version of the input signal and further with a cross-term pre-equalizing coefficient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for reducing adjacent channel power ratio and compensating memory effects of multi-channel wideband communication systems using multiplexing modulation techniques, the system comprising:
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an address generator for generating an address form samples of a baseband input signal of a communication system; a memoryless lookup table having therein coefficients addressable according to the address; a multiplier for combining the baseband input signal and the coefficients;
lookup table entry; andan equalizer for pre-equalizing the multiplier to compensate for memory effects in a power amplifier of the communications system, the pre-equalizing depending on one or more magnitudes of the input signal, wherein the pre-equalization comprises multiplying a magnitude of a first delayed version of the input signal with a magnitude of a second delayed version of the input signal and further with a cross-term pre-equalizing coefficient. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of reducing adjacent channel power ratio and compensating memory effects of multi-channel wideband communication systems using multiplexing modulation techniques, the method comprising:
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generating an address from samples of a baseband input signal of a communication system; retrieving from a memoryless lookup table an entry in accordance with the address; pre-equalizing the baseband input signal, the pre-equalization depending on a present value of the input signal and one or more delayed values of the input signal; and multiplying the pre-equalized baseband input signal and the lookup table entry, wherein the pre-equalization comprises multiplying a first delayed value of the one or more delayed values of the input with a second delayed value of the one or more delayed values of the and further with a cross-term pre-equalizing coefficient. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification