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Solid-state power amplifier ofdm signal digital pre-distortion module in airborne data link and its realization method

A digital predistortion, airborne data technology, applied in digital transmission systems, modulation carrier systems, synchronization/start-stop systems, etc. Reduce the signal peak-to-average ratio and other problems to achieve the effect of increasing the complexity and implementation cost

Active Publication Date: 2021-08-10
BEIJING RES INST OF TELEMETRY +1
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  • Application Information

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Problems solved by technology

However, the implementation of this kind of algorithm needs to add a hardware channel, which greatly affects the instability of the system and the implementation cost.
[0005] With the high-speed data transmission code rate of UAV airborne data link increasing by orders of magnitude, OFDM signal shows the advantages of high-speed and reliable data transmission in low elevation angle environment, but its high peak-to-average ratio characteristic poses a great challenge to the airborne solid-state power amplifier
On the one hand, the method in the above literature only considers reducing the peak-to-average ratio of the signal, and cannot realize the comprehensive optimization of the signal in-band and out-of-band; on the other hand, the designed feedback pre-distortion method increases the design complexity and implementation cost of the transmitter

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  • Solid-state power amplifier ofdm signal digital pre-distortion module in airborne data link and its realization method
  • Solid-state power amplifier ofdm signal digital pre-distortion module in airborne data link and its realization method
  • Solid-state power amplifier ofdm signal digital pre-distortion module in airborne data link and its realization method

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Embodiment 1

[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] like figure 2 When the power amplifier module RFPA2026 shown is at 2.17GHz, when the temperature is 40°C, when the inpu...

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Abstract

The invention discloses a solid-state power amplifier OFDM signal digital pre-distortion module in an airborne data link, which includes an iterative limiting filter unit, a raised cosine filter unit and an oversampling pre-distortion unit, and the iterative limiting filter unit is used to reduce the peak value of the input signal. The average ratio; the raised cosine filter unit reduces the out-of-band interference of the signal spectrum; the over-sampling pre-distortion unit performs nonlinear processing on the over-sampled signal amplitude in the received signal, and obtains the pre-distorted OFDM signal and outputs it. The present invention further discloses the implementation method of the pre-distortion module, the application of the module and the implementation method can reduce the peak-to-average ratio of the signal, realize the comprehensive optimization of the signal in-band and out-of-band, and will not increase the complexity of transmitter design and implementation cost.

Description

technical field [0001] The invention relates to the technical field of digital wireless communication transmission, in particular to a solid-state power amplifier OFDM signal digital pre-distortion module in an airborne data link and an implementation method. Background technique [0002] In the UAV data link system, the airborne data link terminal needs to transmit high-speed image data to the ground station terminal, and the airborne terminal often uses a power amplifier with several watts of output. This type of amplifier is generally a solid-state power amplifier, which generally has better linearity. However, poor nonlinear characteristics still exist near the saturation point of solid-state power amplifiers. Orthogonal Frequency Division Multiplexing (OFDM) technology can realize high-speed and reliable data transmission in a low-elevation environment, but its high peak-to-average ratio also poses more severe challenges to airborne power amplifiers with more restricti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49H04L27/26
CPCH04L25/49H04L27/2614H04L27/2626
Inventor 闫朝星付林罡罗翔彭浪李辉李响
Owner BEIJING RES INST OF TELEMETRY
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