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Phase precoding method and vector millimeter wave signal generation system based on phase precoding factor optimization

A precoding and phase technology, applied in the field of communication, can solve problems such as phase ambiguity, limited performance of optical fiber transmission, and poor performance

Active Publication Date: 2020-10-23
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0004] The existing frequency doubling technology is mainly based on the phase precoding method of phase compression to solve the phase ambiguity at the receiving end. Therefore, the Euclidean distance between the constellation points after precoding is very small, which will affect the performance of transmission in the optical fiber and will also be limited. More susceptible to imperfections in optoelectronic devices and will perform poorly

Method used

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  • Phase precoding method and vector millimeter wave signal generation system based on phase precoding factor optimization
  • Phase precoding method and vector millimeter wave signal generation system based on phase precoding factor optimization
  • Phase precoding method and vector millimeter wave signal generation system based on phase precoding factor optimization

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Embodiment 1

[0048] Such as figure 1 As shown, it is a schematic diagram of the generation system based on the above phase precoding scheme and the optical 6-multiplied vector millimeter wave signal, including the off-line digital signal processing module at the sending end, the digital-to-analog converter module, the electric amplifier, the single-mode laser, the phase modulator, and the wavelength selection Switches, single-ended photodiodes, analog-to-digital converter modules, off-line digital signal processing modules at the receiving end and constellation recovery modules.

[0049] Offline digital signal processing module 1 at the transmitting end, its main function is to generate a phase precoded RF drive signal carrying transmission data based on offline digital signal processing, wherein the phase precoding factor is optimized to 2, and the transmission data can adopt the QPSK vector modulation format;

[0050] The digital-to-analog converter module 2 is mainly used to perform dig...

Embodiment 2

[0063] The distribution of the phase θ of the QPSK signal is [π / 4, 3π / 4, 5π / 4, 7π / 4]. For the case of using K=4n+2, n=1, 2, 3 multiplication to generate the vector millimeter wave signal. We can uniformly optimize the phase precoding factor to 2. At this time, the phase after phase precoding at the transmitter The phase of the signal after photoelectric detection on the receiver side is That is:

[0064] [π / 4+nπ / 2,3π / 4+3nπ / 2,5π / 4+5nπ / 2,7π / 4+7nπ / 2]

[0065] Since the period of the phase is 2π, the phase difference between the third item and the first item is π, and the phase difference between the fourth item and the second item is also π, and the first item (or third item) and the second item (or fourth item) item) the phase difference is That is to say, the signal at the receiving end is still in the constellation distribution of the QPSK signal. Therefore, the phase precoding scheme we propose can be applied to K=4n+2, n=1, 2, 3 frequency multiplication.

[0066] I...

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Abstract

The invention relates to a phase precoding method based on phase precoding factor optimization, and a vector millimeter wave signal generation system, belonging to the technical field of communication. A method of phase precoding factor optimization in the invention is realized through adjusting a sending end phase precoding factor to be 2, increases Euclidean distance among constellation points of the sending end after precoding under the premise of guaranteeing that the received vector signal received by the receiving end is regular QPSK / 8QAM, consequently improves performance of the received vector signal, and can recover original sent data from the signal just by reversing a real part of the signal after processing of an offline digital signal processing module of the receiving end. Avector millimeter wave signal generation system based on the phase precoding scheme can realize generation of a vector millimeter wave signal with excellent performance, and has the advantages of being simple in structure, easy to execute, low-cost, efficient, excellent in system performance, and so on.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a phase precoding method based on phase precoding factor optimization and a vector millimeter wave signal generation system. Background technique [0002] Radio-over-Fiber (RoF for short) technology combines the advantages of optical fiber communication and wireless communication, solves bandwidth problems, flexibility problems, and electromagnetic interference problems, and is expected to be applied in future wireless communications and space communications. Combining RoF technology with mmWave communication can meet the requirements of next-generation mobile communication systems for high bandwidth and high transmission rate. Low-cost and high-stable optical millimeter-wave technology is one of the key technologies in the combination of RoF technology and millimeter-wave communication. External modulation technology is a more commonly used optical-generated millimeter-wave...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34H04B10/50H04B10/556
CPCH04B10/5055H04B10/5561H04L27/3483
Inventor 王斌赵伦储雯
Owner CHONGQING UNIV OF POSTS & TELECOMM
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