CN208158900U - A kind of adaptive signal detection device for 2G and 4G co-sited wideband digital optical fiber repeater - Google Patents
A kind of adaptive signal detection device for 2G and 4G co-sited wideband digital optical fiber repeater Download PDFInfo
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- CN208158900U CN208158900U CN201820711526.4U CN201820711526U CN208158900U CN 208158900 U CN208158900 U CN 208158900U CN 201820711526 U CN201820711526 U CN 201820711526U CN 208158900 U CN208158900 U CN 208158900U
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Abstract
The utility model discloses a kind of adaptive signal detection device for 2G and 4G co-sited wideband digital optical fiber repeater, including optical module, core logic processing apparatus FPGA, digital/analog converter DAC, RF mixing and filtering link；The optical module connects core logic processing apparatus FPGA, core logic processing apparatus FPGA connection digital/analog converter DAC, digital/analog converter DAC connection RF mixing and filtering link；The core logic processing apparatus FPGA includes：Time-domain windowed module, FFT fast Fourier transform module, the multiple cumulative mean module of amplitude spectrum, carrier frequency point and bandwidth statistics module, the time-domain windowed module connects FFT fast Fourier transform module, FFT fast Fourier transform module connects the multiple cumulative mean module of amplitude spectrum, the multiple cumulative mean module connection carrier frequency point of amplitude spectrum and bandwidth statistics module；It further include the coprocessor CPU being connect with core logic processing apparatus FPGA.
Description
Technical field
The utility model relates to signal supervisory instrument fields, specially a kind of straight for 2G and 4G co-sited wideband digital optical fiber
Put the adaptive signal detection device at station.
Background technique
Rapid growth is presented in current mobile user data service, and 2G signal GSM comparison 4G signal LTE spectrum efficiency is low,
It is not able to satisfy user's high speed data requirements, it is contemplated that GSM network utilization rate declines year by year, and GSM band segment is used to build
Higher frequency spectrum efficiency and peak rate can be provided after LTE to meet the growing high-speed demand of user.GSM is due to being narrowband letter
Number, and there is permanent envelope trait, signal peak-to-average power is relatively low, does not need using CFR (crest factor reduction) skill
Art, and LTE signal all uses the availability of frequency spectrum higher BPSK, QPSK, 8PSK, 16QAM to improve the utilization efficiency of frequency spectrum
Etc. modulation systems, these modulation systems not only the phase of carrier wave is modulated, also the amplitude of carrier wave is modulated, therefore,
These modulation systems can have the non-constant enveloped modulation signal of larger peak-to-average force ratio.This modulation system is intended to carry out signal
Linear amplification, however the envelope signal of non-constant amplitude can generate biggish peak-to-average force ratio, this is proposed to the semiconductor devices in system
Higher linearity, in order to improve the working efficiency of device as far as possible, it is desirable to signal has alap peak-to-average force ratio,
So reducing the peak-to-average force ratio of signal is particularly important, therefore peak clipping technology is come into being.
Current most widely used peak clipping technology is PC-CFR (Peak Cancellation Crest Factor
Reduction), PC-CFR needs to produce a despiking coefficient according to the frequency point and bandwidth to peak clipping signal, with this peak clipping system
Number goes to subtract each other with signal peak multiplied by a range coefficient, to reduce the peak-to-average force ratio of signal.GSM frequency range Refarming (frequency
Backset) it to the frequency point and bandwidth of LTE is that flexible and changeable or even each area has different configurations, this makes tradition fixed
The wideband digital optical fiber repeater that frequency point determines bandwidth peak clipping is unable to satisfy existing demand.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of for 2G and 4G co-sited wideband digital optical fiber direct amplification
The adaptive signal detection device stood solves the problems, such as that current peak clipping technology is unable to satisfy different frequent points and bandwidth.
To achieve the above object, the utility model provides the following technical solutions：One kind being used for 2G and 4G co-sited wideband digital
The adaptive signal detection device of optical fiber repeater, including optical module, core logic processing apparatus FPGA, digital-to-analog conversion
Device DAC, RF mixing and filtering link；The optical module connects core logic processing apparatus FPGA, core logic processing apparatus FPGA
Connect digital/analog converter DAC, digital/analog converter DAC connection RF mixing and filtering link；
The core logic processing apparatus FPGA includes：
Time-domain windowed module is used on time-domain signal multiplied by a window sequence；
FFT fast Fourier transform module, for time-domain signal to be converted into frequency-region signal；
The multiple cumulative mean module of amplitude spectrum adds up for multiple amplitude spectrum and is averaged；
Carrier frequency point and bandwidth statistics module compose the bandwidth and frequency point of interior LTE carrier wave for counting signal amplitude；
The time-domain windowed module connects FFT fast Fourier transform module, and FFT fast Fourier transform module connects width
Degree composes multiple cumulative mean module, the multiple cumulative mean module connection carrier frequency point of amplitude spectrum and bandwidth statistics module；
It further include the coprocessor CPU being connect with core logic processing apparatus FPGA, for receiving carrier frequency point and band
The bandwidth and frequency point of wide statistical module counts generate and generate new despiking coefficient；
New despiking coefficient is written inside core logic processing apparatus FPGA by sram bus by coprocessor CPU
In PC-CFR module.
Preferably, the window sequence is Hamming or Blackman or Gaussian.
The beneficial effects of the utility model：GSM frequency range Refarming (frequency is backsetted) is suitable for frequency required for LTE
The flexible and changeable property of point and bandwidth, the adaptive frequency point and bandwidth for detecting the LTE carrier wave in former gsm wireless frequency range,
To generate despiking coefficient required for corresponding PC-CFR, peak clipping operation is carried out to the LTE signal in former gsm wireless frequency range.
Detailed description of the invention
Fig. 1 is the hardware architecture figure of the utility model.
Fig. 2 is the internal module schematic diagram of the FPGA of the utility model.
Wherein：1, optical module, 2, core logic processing apparatus FPGA, 3, digital/analog converter DAC, 4, RF mixing filter
Wave link, 5, coprocessor CPU, 6, time-domain windowed module, 7, FFT fast Fourier transform module, 8, amplitude spectrum repeatedly adds up
Averaging module, 9, carrier frequency point and bandwidth statistics module.
Specific embodiment
As shown in Figure 1, 2, a kind of adaptive signal detection device for 2G and 4G co-sited wideband digital optical fiber repeater,
Including optical module, core logic processing apparatus FPGA, digital/analog converter DAC, RF mixing and filtering link；The optical module
Connect core logic processing apparatus FPGA, core logic processing apparatus FPGA connection digital/analog converter DAC, digital-to-analog
Converter DAC connection RF mixing and filtering link；
The core logic processing apparatus FPGA includes：
Time-domain windowed module is used on time-domain signal multiplied by a Hamming window sequence；
FFT fast Fourier transform module, for time-domain signal to be converted into frequency-region signal；
The multiple cumulative mean module of amplitude spectrum adds up for multiple amplitude spectrum and is averaged；
Carrier frequency point and bandwidth statistics module compose the bandwidth and frequency point of interior LTE carrier wave for counting signal amplitude；
The time-domain windowed module connects FFT fast Fourier transform module, and FFT fast Fourier transform module connects width
Degree composes multiple cumulative mean module, the multiple cumulative mean module connection carrier frequency point of amplitude spectrum and bandwidth statistics module；
Time-domain signal is 1024 points multiplied by a length by o'clock with 1024 points for one group in time-domain windowed module
Hamming window sequence, window function can largely reduce the spectral leakage problem due to caused by signal cutout, and 1024 points
One group of signal gives FFT fast Fourier transform module, time-domain signal is converted into frequency-region signal, amplitude spectrum repeatedly adds up flat
Equal module by 20 groups 1024 points of frequency-region signal carry out it is cumulative be averaged it is more stable so that frequency spectrum is smoother, then by spectrum signal
Give carrier frequency point and bandwidth statistics module, the module by being counted for the signal for being continuously higher than amplitude threshold, when
Count value meets LTE carrier bandwidths, then records the bandwidth and frequency point information of the LTE carrier wave, give coprocessor CPU.
The coprocessor CPU being connect with core logic processing apparatus FPGA, for receiving carrier frequency point and bandwidth statistics
The bandwidth and frequency point, FPGA of module statistics are communicated with CPU by SRAM bus, are stored in CPU automatic regular polling FPGA
Bandwidth and frequency point information then generate if it find that bandwidth and frequency point information have variation and generate new despiking coefficient, pass through
SRAM bus will be in the PC-CFR module inside new despiking coefficient write-in core logic processing apparatus FPGA.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modification, equivalent replacement or improvement etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (2)
1. a kind of adaptive signal detection device for 2G and 4G co-sited wideband digital optical fiber repeater, which is characterized in that packet
Include optical module, core logic processing apparatus FPGA, digital/analog converter DAC, RF mixing and filtering link；The optical module connects
Core logic processing apparatus FPGA, core logic processing apparatus FPGA connection digital/analog converter DAC are met, digital-to-analog turns
Parallel operation DAC connection RF mixing and filtering link；
The core logic processing apparatus FPGA includes：
Time-domain windowed module is used on time-domain signal multiplied by a window sequence；
FFT fast Fourier transform module, for time-domain signal to be converted into frequency-region signal；
The multiple cumulative mean module of amplitude spectrum is used for multiple amplitude spectrum cumulative mean；
Carrier frequency point and bandwidth statistics module compose the bandwidth and frequency point of interior LTE carrier wave for counting signal amplitude；
The time-domain windowed module connects FFT fast Fourier transform module, and FFT fast Fourier transform module connects amplitude spectrum
Multiple cumulative mean module, the multiple cumulative mean module connection carrier frequency point of amplitude spectrum and bandwidth statistics module；
It further include the coprocessor CPU being connect with core logic processing apparatus FPGA, for receiving carrier frequency point and bandwidth system
The bandwidth and frequency point for counting module statistics, generate and generate new despiking coefficient；
The PC-CFR inside core logic processing apparatus FPGA is written by sram bus by coprocessor CPU for new despiking coefficient
In module.
2. a kind of adaptive signal detection for 2G and 4G co-sited wideband digital optical fiber repeater fills according to claim 1
It sets, which is characterized in that the window sequence is Hamming or Blackman or Gaussian.
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| CN201820711526.4U CN208158900U (en) | 2018-05-14 | 2018-05-14 | A kind of adaptive signal detection device for 2G and 4G co-sited wideband digital optical fiber repeater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115913373A (en) * | 2022-11-03 | 2023-04-04 | 四川天邑康和通信股份有限公司 | Input signal frequency spectrum detection method of digital optical fiber repeater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115913373A (en) * | 2022-11-03 | 2023-04-04 | 四川天邑康和通信股份有限公司 | Input signal frequency spectrum detection method of digital optical fiber repeater |
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