Bandwidth self-adaption method and device

Abstract

The invention discloses a bandwidth self-adaption method and device. The bandwidth self-adaption method comprises the following steps: S1, receiving a downlink broadband signal; s2, performing low-pass filtering on the downlink broadband signal, and extracting a synchronization signal of a bandwidth center; s3, reducing the sampling rate of the synchronization signal; s4, performing signal detection on the down-sampled synchronization signal; and S5, generating broadband configuration according to the detected signal, and carrying out frequency shifting and low-pass filter filtering. The method is wider in adaptability, can support 2G / 3G / 4G / 5G, future 6G and other coverage systems with fixed frequency spectrums at the same time, well solves the problem of information source bandwidth change, and solves the problems of signal detection and bandwidth self-adaption at low cost, so that the system performance is not affected, and signals do not need to be disconnected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of 5G mobile communication indoor distribution technology, more particularly, to a bandwidth adaptive method and device. BACKGROUND

[0002] Currently, operators continuously optimize network quality as business and coverage requirements change. Generally, signal coverage is achieved by base stations, but in order to consider the return on investment ratio, many low-value scenarios use active distribution systems or repeaters for coverage.

[0003] Operators select different indoor coverage solutions according to different capacity scenarios, construction convenience, and equipment costs. Currently, indoor coverage solutions can be roughly divided into three categories: distributed picocell base stations, optical fiber repeaters, optical fiber distribution systems, coaxial cable distribution systems, and wireless repeaters, etc.

[0004] In order to provide users with better network experience, the operator's network will be regularly optimized and adjusted. If the coverage solution cannot be changed adaptively, it will require costs such as property coordination, re-networking, and post-maintenance of equipment, etc.

[0005] Currently, there are several solutions for bandwidth adjustment of coverage solutions: Solution one: fixed bandwidth, set by default at the factory, and cannot be adjusted. If the bandwidth of the operator changes or the frequency band of the carrier changes, it needs to be changed on site or set on the network management platform. If the device does not support this frequency band, it needs to be replaced.

[0006] Solution two: analog full-bandwidth device, bandwidth cannot be adjusted, this solution can achieve full-bandwidth at a lower cost. However, a complete frequency band is generally close to other operators. For example, the domestic 1800 frequency band (Band 3), mobile is 1805-1830MHz, Unicom is 1830-1860MHz, and Telecom is 1860-1880. If the device amplifies the signal (1805-1880MHz) full-bandwidth, it will interfere with the frequency band of other operators.

[0007] Solution three: bandwidth can be changed, achieved by RB number statistics of the baseband. This method can only support a single standard, and requires a high-performance baseband chip, which requires a high cost to implement. Generally, repeaters need to support 2G / 3G / 4G / 5G, and subsequent 6G system spectrum.

[0008] In order to solve the above problems, a bandwidth adaptive method and device are needed. SUMMARY

[0009] The present application aims to provide a bandwidth adaptive method and device to overcome the defects of the prior art.

[0010] To achieve the above object, the technical scheme adopted by the present application is as follows: A bandwidth adaptive method, comprising the following steps: S1, receiving a downlink broadband signal; S2, low-pass filtering the downlink broadband signal to extract a bandwidth-centered synchronization signal; S3, reducing the sampling rate of the synchronization signal; S4, detecting the signal of the down-sampled synchronization signal; S5, generating a broadband configuration according to the detected signal, and then performing frequency shifting and low-pass filter filtering.

[0011] Further, the step S1 specifically comprises sending the downlink broadband signal sampled by an ADC into an FPGA chip for processing.

[0012] Further, the step S4 comprises: judging whether a set broadband indication is detected; if yes, outputting the detected peak value and position, and clearing the peak value latch and peak position latch, prompting the next round of correlation operation; comparing the peak values of N peak value detections.

[0013] Further, the set broadband indication is a 160ms broadband indication.

[0014] Further, the step S5 specifically comprises outputting a broadband configuration according to the peak value size and peak value position.

[0015] Further, the step of outputting a broadband configuration according to the peak value size and peak value position specifically comprises defining the peak value position as the output broadband.

[0016] The present application also provides a device for the above bandwidth adaptive method, comprising: a receiving module for receiving a downlink broadband signal; a low-pass filtering module for low-pass filtering the downlink broadband signal to extract a bandwidth-centered synchronization signal; a down-sampling module for reducing the sampling rate of the synchronization signal; a power detection module for detecting the signal of the down-sampled synchronization signal; a configuration module for generating a broadband configuration according to the detected signal, and then performing frequency shifting and low-pass filter filtering; The receiving module, low-pass filtering module, down-sampling module, power detection module and configuration module are connected in sequence.

[0017] Compared with the prior art, the application has the advantages that the application has wider adaptability, can support 2G / 3G / 4G / 5G and future 6G and the like spectrum fixed coverage systems at the same time, and solves the problem of signal source bandwidth variation, and uses low-cost signal detection and bandwidth adaptation, so that the system performance is not affected and the signal is not disconnected. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0019] Figure 1 is a flow chart of the bandwidth adaptation method of the present application.

[0020] Figure 2 is a flow chart of power detection in the present application.

[0021] Figure 3 is a relationship diagram of bandwidth and center frequency in the present application.

[0022] Figure 4 is a framework diagram of the bandwidth adaptation device of the present application. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present application will be described in detail below with reference to the drawings, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the protection scope of the present application can be more clearly and definitely defined.

[0024] Referring to Figures 1-2 , the present embodiment discloses a bandwidth adaptation method, comprising the following steps: Step S1, receiving a downlink broadband signal.

[0025] In the present embodiment, the downlink broadband signal after ADC sampling is sent to the FPGA chip for processing, and according to the frequency domain characteristics of the downlink signal, the method is to use the signal power of the subcarrier to detect the bandwidth of the downlink signal.

[0026] Step S2, low-pass filtering the downlink broadband signal to extract the synchronization signal at the center of the bandwidth, so as to reduce the influence of other signals.

[0027] Step S3, in order to reduce the complexity of the correlator operation, it is necessary to reduce the sampling rate of the received baseband signal, and to sample the synchronization signal at a reduced sampling rate.

[0028] Step S4, signal detection is performed on the down-sampled synchronization signal, specifically: It is judged whether the set wideband indication is detected, and in this embodiment, the set wideband indication is 160 ms. There are 0-N peak values greater than the threshold in the 160 ms calculation period, and then the maximum bandwidth value is taken. Finally, the position of the peak value is calculated, and the bandwidth configuration is output. In summary, there is only one maximum bandwidth output in the relevant calculation 160 ms period.

[0029] If yes, the detected peak value and position are output, the peak value latch and the peak position latch are cleared, and the next round of correlation operation is prompted; The peak values of the N paths of peak value detection are compared.

[0030] Step S5, wideband configuration is generated according to the detected signal. In this embodiment, the wideband configuration can be output according to the peak value size and the peak value position, that is, the position of the peak value is defined as the output wideband, and then frequency shifting and low-pass filter filtering are performed to realize bandwidth adaptation.

[0031] In this embodiment, due to the characteristics of the system signal, it is transmitted once every frame, and the bandwidth power of 12 subcarriers can be collected to judge the signal bandwidth. The bandwidth of the subcarrier is variable and can also be changed according to engineering needs.

[0032] Frequency shifting is to separate a part of the signal from the main signal, and the formula of the frequency value is: 1) When frequency shifting downward: Nco=frequency value / 122.88*2^32; 2) When frequency shifting upward: Nco=(122.88-frequency value) / 122.88*2^32; Low-pass filter filtering is performed because the signal after frequency shifting is very large. In order to detect a RB (12 subcarriers) signal, the received signal (baseband signal) is pre-filtered by a low-pass filter to extract the required bandwidth signal, so as to reduce the influence of other signals.

[0033] In order to correctly search the subcarrier power value, the bandwidth display can be obtained only after one frame of data is calculated. The frame can be adjusted according to needs, and the current statistics is 160 ms.

[0034] For example, there are 1.4 / 3 / 5 / 10 / 15 / 20MHz wideband signals, and the embodiment takes 20MHz signals as an example. The ADC collects signals to the FPGA baseband, and then converts the frequency, detects 12 subcarriers each time, 12*15KHz=180KHz. Each time, the 180KHz signal is detected until the maximum bandwidth supported by the device (such as 20MHz) is detected. For example, 20MHz=20000KHz / 180KHz=111 times. Every three times, it is compared once, and then the peak value is taken, and the position of the detected peak value is defined as the bandwidth at this time, until the bandwidth supported by the device is detected, as shown in Figure 3 For example, if the sampling point power in the NCO 5MHz OFDM symbol reads 0.5ms, the average value of 20ms is read, and then 8 times are taken continuously, a total of 160ms. The power reading is greater than the threshold A. Then the NCO 5MHz bandwidth is the effective bandwidth. Then the NCO moves to 5MHz+0.018MHz, and moves to 25MHz. The final bandwidth is 25MHz.

[0035] Referring to Figure 4 The application also provides a device for the above bandwidth adaptive method, comprising: a receiving module 1 for receiving a downlink wideband signal; a low-pass filtering module 2 for low-pass filtering the downlink wideband signal to extract a bandwidth center synchronization signal; a downsampling module 3 for reducing the sampling rate of the synchronization signal; a power detection module 4 for detecting the signal of the downsampled synchronization signal; a configuration module 5 for generating a wideband configuration according to the detected signal, and then moving the frequency and filtering the low-pass filter; the receiving module 1, the low-pass filtering module 2, the downsampling module 3, the power detection module 4 and the configuration module 5 are connected in sequence.

[0036] The application has wider adaptability, can support 2G / 3G / 4G / 5G and future 6G and other spectrum fixed coverage systems, and can well solve the problem of signal source bandwidth change, and can use low-cost signal detection and bandwidth adaptation, so as to not affect the system performance and not need to disconnect the signal.

[0037] Although the embodiments of the application are described in combination with the drawings, the patent owner can make various modifications or changes within the scope of the appended claims, as long as they do not exceed the protection scope described in the claims of the application, and should be within the protection scope of the application.

Claims

1. A bandwidth adaptation method, characterized by, The method comprises the following steps: S1, receiving a downlink broadband signal; S2, low-pass filtering the downlink broadband signal to extract a bandwidth-centered synchronization signal; S3, sampling rate reduction of the synchronization signal; S4, signal detection of the down-sampled synchronization signal; S5, generating a broadband configuration according to the detected signal, and then frequency shifting and low-pass filter filtering.

2. The bandwidth adaptation method of claim 1, wherein, The step S1 specifically comprises sending the downlink broadband signal sampled by an ADC into an FPGA chip for processing.

3. The bandwidth adaptation method of claim 1, wherein, The step S4 comprises: judging whether a set broadband indication is detected; if yes, outputting the detected peak value and position, and clearing the peak value latch and peak position latch, prompting the next round of correlation operation; comparing the peak values of N peak value detections.

4. The bandwidth adaptation method of claim 3, wherein, The set broadband indication is a 160 ms broadband indication.

5. The bandwidth adaptation method of claim 3, wherein, The step S5 specifically comprises outputting a broadband configuration according to the peak value size and peak value position.

6. The bandwidth adaptation method of claim 5, wherein, The outputting of the broadband configuration according to the peak value size and peak value position specifically comprises defining the peak value position as the output broadband.

7. An apparatus for implementing the bandwidth adaptation method of any one of claims 1-6, characterized in that, The method comprises: a receiving module for receiving a downlink broadband signal; a low-pass filtering module for low-pass filtering the downlink broadband signal to extract a bandwidth-centered synchronization signal; a down-sampling module for sampling rate reduction of the synchronization signal; a power detection module for signal detection of the down-sampled synchronization signal; a configuration module for generating a broadband configuration according to the detected signal, and then frequency shifting and low-pass filter filtering; the receiving module, the low-pass filtering module, the down-sampling module, the power detection module and the configuration module are sequentially connected.

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