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 comprising the steps ofgenerating 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 using the following equation;
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Abstract
An efficient baseband predistortion linearization method for reducing the spectral regrowth and compensating memory effects in wideband communication systems using effective multiplexing modulation technique such as wideband code division multiple access and orthogonal frequency division multiplexing is disclosed. The present invention is based on the method of piecewise pre-equalized lookup table based predistortion, which is a cascade of a lookup table predistortion and piecewise pre-equalizers, to reduce the computational complexity and numerical instability for desired linearity performance with memory effects compensation for wideband transmitter systems.
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Citations
11 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 comprising the steps of
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 using the following equation; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for reducing adjacent channel power ratio and compensating memory effects of multi-channel wideband communication systems using multiplexing modulation techniques comprising an address generator for generating an address form samples of a baseband input signal of a communication system;
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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, wherein pre-equalizing comprises using the following equation;
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Specification