Digital predistortion module for solid state power amplifier OFDM signal in onboard data link and realization method
A digital predistortion, airborne data technology, applied in the direction of digital transmission system, modulation carrier system, electrical components, etc., can solve the influence of system instability and implementation cost, can not achieve comprehensive optimization of signal band, and increase the complexity of transmitter design problems such as complexity and implementation cost, to achieve the effect of increasing the complexity and implementation cost
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[0091] The performance simulation results of the solid-state power amplifier OFDM signal digital predistortion method in the airborne data link of the present invention are analyzed.
[0092] according to figure 1 Construct the simulation system, the OFDM system parameter is N s =1024,N u =720,N g =128, the iterative limiting filtering unit configures the target limiting amplitude A according to the peak-to-average ratio suppression of 3dB. The prefix windowing coefficient of the raised cosine filter unit is c p =[0 0.0125 0.0495 0.1091 0.1883 0.2831 0.3887 0.5 0.6113 0.7169 0.8117 0.89090.9505 0.9875 1], the suffix windowing coefficient is symmetrically equal to the prefix windowing coefficient. The solid-state power amplifier refers to the 3-state, 2W output power amplifier RFPA2026 of rfmd company, and the frequency range is 700MHz-2700MHz.
[0093] Such as figure 2 When the power amplifier module RFPA2026 shown is at 2.17GHz, when the temperature is 40°C, when the i...
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