Phase precoding method for constellation point distribution optimization and vector millimeter wave signal generation system

A signal generation and precoding technology, applied in the direction of phase-modulated carrier system, multi-carrier system, modulated carrier system, etc., can solve the problems of small effective number of bits, deterioration of vector signal performance, etc., and achieve simple implementation, simple structure, and high cost Effect

Active Publication Date: 2017-06-20
FUDAN UNIV
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Problems solved by technology

Due to the limited signal-to-noise ratio and the small effective bit count of the digital-to-analog converter at high frequencies, some constellation points are clustered together, deteriorating the performance of the vector signal detected at the receiver

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  • Phase precoding method for constellation point distribution optimization and vector millimeter wave signal generation system
  • Phase precoding method for constellation point distribution optimization and vector millimeter wave signal generation system

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with specific experimental examples and accompanying drawings.

[0025] figure 2 Shown is a vector millimeter-wave signal generation system based on the above phase precoding scheme and optical six-fold frequency, which includes:

[0026] The off-line digital signal processing module 1 at the transmitting end is mainly used to generate a precoded radio frequency signal carrying transmission data based on off-line digital signal processing. Sending data can adopt QPSK, 8QAM, 16QAM and other vector modulation formats. For sexuplicated mmWave signal generation, the precoding phase factor should be reduced to less than 6 to appropriately increase the distance between adjacent constellation points that may be close together.

[0027] The digital-to-analog converter module 2 is mainly used to perform digital-to-analog conversion on the precoded radio frequency signal carrying transmission data generated...

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Abstract

The invention belongs to the technical field of radio over fiber wireless communication systems and particularly relates to a phase precoding method for achieving constellation point distribution optimization and a vector millimeter wave signal generation system based on the method. The phase precoding method for constellation point distribution optimization achieves the constellation point distribution optimization by adjusting the precoding phase factor, and can promote the uniform distribution of the constellation points of the received vector signal at the receiving end, thereby improving the detected vector signal performance. The vector millimeter wave signal generation system based on the above-mentioned phase precoding scheme can realize the generation of the six-fold frequency electric vector millimeter wave of high stability, high purity and high performance, and has the advantages of simple implementation and simple structure. The application in the communication system can simplify the radio over fiber wireless communication system architecture, and reduce the cost of radio over fiber wireless communication system.

Description

technical field [0001] The invention belongs to the technical field of radio-over-fiber (Radio-over-Fiber, abbreviated as RoF) communication system, and specifically relates to a phase precoding method capable of realizing the optimization of constellation point distribution and a vector millimeter wave signal generation system based on the method. Background technique [0002] Photonic-based mmWave generation enables very high-frequency operation. An electrical millimeter wave can be generated when two continuous-wave light waves with a specific frequency separation (30-300 GHz) are beat by a broadband photodiode capable of square-law detection. Two CW light waves from one laser source have many advantages, such as stable frequency, low phase and intensity noise, and simple structure. Optically generated millimeter waves based on frequency doubling can be realized by driving an intensity modulator with an appropriate driving voltage. The scientific community has proposed ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2575H04B10/50H04B10/556H04L27/20H04L27/34
CPCH04B10/25752H04B10/5055H04B10/5561H04L27/2096H04L27/3483
Inventor 余建军肖江南李欣颖
Owner FUDAN UNIV
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