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Digital mobile forward transmission method and device based on Delta-Sigma modulation

A pre-movement, digital technology, applied in optical fiber transmission, transmission system, AM carrier system, etc., can solve the problems of limited capacity expansion, inability to realize dynamic adjustment of signal-to-noise ratio, etc., and achieve the effect of increasing distance

Active Publication Date: 2022-01-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]In general, the existing optical fiber wireless fronthaul network has limited capacity expansion and cannot realize dynamic adjustment of signal-to-noise ratio

Method used

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  • Digital mobile forward transmission method and device based on Delta-Sigma modulation
  • Digital mobile forward transmission method and device based on Delta-Sigma modulation
  • Digital mobile forward transmission method and device based on Delta-Sigma modulation

Examples

Experimental program
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Effect test

Embodiment 1

[0050] A digital mobile fronthaul method based on Delta-Sigma modulation, such as figure 1 shown, including:

[0051] Perform Delta-Sigma modulation on the two analog signals to convert the two analog signals into digital bit streams, which are respectively recorded as the first OOK signal and the second OOK signal; the first OOK signal and the second OOK signal are respectively used as MSB Combined with LSB to generate a PAM4 signal, and convert the PAM4 signal into a radio frequency signal output; the PAM4 signal generated in this embodiment is formed by combining two OOK signals as MSB and LSB respectively, so it can be regarded as a Layered modulated PAM4 signal, where MSB and LSB can be regarded as the first layer and the second layer in layered modulation, respectively;

[0052] After the radio frequency signal is electro-optical converted, it is transmitted from one end of the optical fiber link to the other end, and then restored to the radio frequency signal through ...

Embodiment 2

[0072] A digital mobile fronthaul device based on Delta-Sigma modulation, such as figure 1 As shown, including: centralized BBU pool, optical fiber transmission module and RRU end;

[0073] The centralized BBU pool includes the first Delta-Sigma modulator, the second Delta-Sigma modulator, the layered modulator, and the RF output module; the first Delta-Sigma modulator and the second Delta-Sigma modulator are used for two-way The analog signal is subjected to Delta-Sigma modulation to convert two analog signals into digital bit streams, which are respectively recorded as the first OOK signal and the second OOK signal; the two input terminals of the layered modulator are respectively connected to the first Delta- The output terminal of Sigma modulator and the second Delta-Sigma modulator, it is used for combining the first OOK signal and the second OOK signal as MSB and LSB respectively, to generate PAM4 signal; Radio frequency output module, its input terminal is connected To...

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Abstract

The invention discloses a digital mobile forward transmission method and device based on Delta-Sigma modulation, and belongs to the technical field of optical fiber wireless fusion access, and the method comprises the steps: converting two analog signals into digital bit streams through Delta-Sigma modulation, recording the digital bit streams as a first OOK signal and a second OOK signal respectively, combining the digital bit streams as an MSB and an LSB respectively to generate a PAM4 signal, and outputting the PAM4 signal through radio frequency; after electro-optical conversion is carried out on the radio-frequency signal, transmitting the radio-frequency signal through an optical fiber link by utilizing a single wavelength, and then reducing the radio-frequency signal into the radio-frequency signal through photoelectric conversion; at the RRU end, separating the MSB and the LSB in the PAM4 signal so as to restore the first OOK signal and the second OOK signal; respectively filtering out-of-band quantization noise in the two paths of OOK signals so as to recover two paths of analog signals, and transmitting the two paths of analog signals to two RRUs for wireless transmission; before combination, achieving the signal-to-noise ratio distribution of the two paths of signals by adjusting the amplitudes of the two paths of OOK signals. According to the invention, the number of access users can be doubled without increasing the number of wavelengths, and the signal-to-noise ratio of the RRU end can be flexibly configured.

Description

technical field [0001] The invention belongs to the technical field of optical fiber wireless fusion access, and more specifically relates to a digital mobile fronthaul method and device based on Delta-Sigma modulation. Background technique [0002] In recent years, with the popularization of the Internet of Everything and cloud services, the amount of data on digital applications is growing rapidly. Therefore, higher requirements are placed on the throughput of the base station and the capacity of the fronthaul network, mainly in the spectrum efficiency of the fronthaul network, Transmission signal-to-noise ratio, flexibility, and cost. Therefore, optimization of the existing fronthaul network structure and technological innovation have become problems to be solved in the development of 5G. [0003] The digital fronthaul solution can better resist the influence of channel noise and distortion on the signal, but the bandwidth required by the link is much higher than the act...

Claims

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Application Information

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IPC IPC(8): H04B10/2575H04B10/524H04B10/54H04L27/08
CPCH04B10/25753H04B10/541H04L27/08H04B10/524Y02D30/70
Inventor 杨奇邹阳钟林晟戴潇潇程孟凡邓磊刘德明
Owner HUAZHONG UNIV OF SCI & TECH