Envelope assisted rf/if digital predistortion technology for broadband rof system

A digital pre-distortion and pre-distortion technology, applied in the direction of synchronization/start-stop system, optical fiber transmission, optical fiber radio, etc., can solve the problems of long memory depth and complex modeling, and achieve the best effect of ACPR

Active Publication Date: 2021-12-14
YUNNAN UNIV
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AI Technical Summary

Problems solved by technology

Due to the wide sampling bandwidth and small sampling interval, in order to weaken the influence of the long-term memory effect, the memory depth required by the DPD model is too long. For broadband systems such as 5G, the sampling rate will be higher and the modeling will be more complicated.

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  • Envelope assisted rf/if digital predistortion technology for broadband rof system
  • Envelope assisted rf/if digital predistortion technology for broadband rof system
  • Envelope assisted rf/if digital predistortion technology for broadband rof system

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Embodiment Construction

[0027] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a wideband ROF system RF / IF envelope assisted digital pre-distortion technology.

[0028] The broadband ROF system RF / IF envelope assisted predistortion technology of the present invention is used for the linearization of the broadband optical radio transmission system, such as figure 1 shown.

[0029] The present invention is a wideband ROF system RF / IF envelope assisted digital pre-distortion technology, which adopts image 3 The indirect learning structure implements DPD, and the model coefficients in formula (1) are calculated by the least square method. The RF / IF signal x(n) and the baseband signal envelope w(n) are fed into nonlinear devices such as RoF links or RF power amplifiers through the output signal z(n) of the digital pre-distortion module (A). The output signal y(n) of the nonlinear device is attenuated by G times (G represents the gain of the nonlinear de...

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Abstract

The invention relates to a broadband ROF system envelope-assisted RF / IF digital pre-distortion technology, which relates to a linearization technology for a broadband multi-band radio-on-fiber (ROF) transmission system including RF power amplifiers. The invention adopts radio frequency / intermediate frequency (RF / IF) envelope and baseband envelope sampling at the same time, which reduces the influence of long-term and short-term memory effects of broadband signals. Compared with the existing digital predistortion model, the invention has better performance and lower complexity, and the complexity does not increase with the increase of the number of signal frequency bands. The advantages of the present invention are: 1. The digital predistortion linearization method of the present invention can eliminate both the in-band nonlinearity and the out-of-band nonlinearity, and although the traditional digital predistortion method can eliminate the in-band nonlinearity, it does not 2. The number of coefficients of the digital predistortion linearization method of the present invention is small, the complexity is low, and the complexity will not increase with the increase of the number of frequency bands.

Description

technical field [0001] The invention relates to a predistortion technology for linearization of a broadband multi-band radio-on-fiber (ROF) transmission system including an RF power amplifier. Background technique [0002] With the deployment of LTE / LTE-A and the development of 5G mobile telecom standards, the radio access network (RAN) needs to provide higher capacity, which also means higher cost. When a radio-on-fiber (RoF) transmission system is used in a radio access network, the physical functional unit at the remote antenna location can be greatly simplified, thereby reducing maintenance costs. At the same time, broadband and high-quality radio frequency / microwave / wireless signal transmission can be realized. [0003] The RoF transmission system connects a central processing unit (CPU) and a remote radio unit (RRU) through an optical fiber to transmit wireless RF signals. Therefore, functions such as RF up-conversion, RF down-conversion, modulation and demodulation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/49H04B10/2575
CPCH04B10/2575H04L25/49
Inventor 张秀普申东娅唐伟杰尤丹丹
Owner YUNNAN UNIV
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