WO2016105061A1

WO2016105061A1 - Power measuring system and power measuring method

Info

Publication number: WO2016105061A1
Application number: PCT/KR2015/014052
Authority: WO
Inventors: 나봉철
Original assignee: 주식회사 쏠리드
Priority date: 2014-12-22
Filing date: 2015-12-21
Publication date: 2016-06-30
Also published as: KR20160089352A; KR101765295B1

Abstract

A power measuring system, according to one embodiment of the technical concept of the present invention, comprises: a detection unit detecting an input radio frequency (RF) signal and outputting a power measurement value; and a controller provided with a root mean square (RMS) average power calculating unit and a peak power calculating unit, the RMS average power calculating unit calculating a RMS average power value of the RF signal on the basis of the power measurement value, and the peak power calculating unit calculating a peak power value of the RF signal on the basis of the power measurement value.

Description

Power measurement system and power measurement method

The technical idea of the present invention relates to a power measurement system and a power measurement method. More specifically, the present invention relates to a power measurement system and a power measurement method for measuring the power of an input RF (Radio Frequency) signal.

Recently, with the rapid development of mobile communication, users' usage forms and demands are also diversified, and users want to communicate without restriction of time and space. However, as shadow areas exist due to limited output, location, and terrain of the base station, it is difficult to provide mobile communication services to users smoothly. Distributed antenna systems and wireless repeaters are widely used as examples.

As an example of a distributed antenna system, a distributed antenna system may be installed in an area where a radio wave is not received or a radio wave is poorly received, such as inside a building, a basement of a building, a subway, a tunnel, or an apartment complex in a residential area, thereby re-amplifying an RF signal received from a base station. By transmitting to the terminal, the coverage of the base station is expanded.

The distributed antenna system must amplify an RF signal input by a required power gain and transmit it to the terminal in order to provide a service suitable for each service provider's request, service environment, and service situation. If the distributed antenna system fails to accurately measure the power of the input RF signal and abnormally amplifies the input RF signal, problems such as deterioration due to low power, oscillation due to overpower, increased power consumption, and element breakdown are caused. Accordingly, it is important to accurately measure the power of the RF signal input from the distributed antenna system to determine the output gain.

In general, in a distributed antenna system, the root mean square (RMS) power of an RF signal received from a base station is measured, and the gain is determined based on the measured RMS power to amplify and output the RF signal. However, according to this method, when the base station signal is not full traffic, for example, when setting a distributed antenna system, the power measurement value is measured low and the RF signal has a power gain amount larger than the required power gain amount. There was a problem of amplifying and outputting.

In more detail with reference to the resource block of the LTE signal shown in Figure 1, when not in full traffic, the reference signal (reference signal, R0 to R4) is present in the resource block of the LTE signal, but the data (D) is not present In the general distributed antenna system, the RMS power is measured in consideration of all the resource elements in which no data exists. Therefore, the RMS power, which is the basis for determining the power gain amount, is measured to be low. As a result of amplifying and outputting an RF signal with a power gain amount larger than the actually required power gain amount, the problems caused by the above-mentioned output have been caused.

A power measuring system and a power measuring method according to the technical idea of the present invention aim to solve a problem when only the RMS power of an RF signal is measured.

In addition, a power measurement system and a power measurement method according to the technical idea of the present invention aims to accurately measure the power of the RF signal.

In addition, a power measurement system and a power measurement method according to the technical idea of the present invention aims to reduce the production cost of the device for measuring RMS power and peak power.

According to an aspect of the present invention, there is provided a power measurement system including: a detector configured to detect an input radio frequency (RF) signal and output a power measurement value; And an RMS average power calculator configured to calculate a root mean square (RMS) average power value for the RF signal based on the power measurement value, and a peak power value for the RF signal based on the power measurement value. It includes; a controller having a peak power calculation unit for calculating.

In an exemplary embodiment, the controller may further include an analog-digital (AD) converter for sampling the power measurement value and converting the power measurement value into a digital signal including a plurality of sampling values. The average power calculator may calculate the RMS average power value using the plurality of sampling values, and the peak power calculator may calculate the peak power value using the plurality of sampling values.

In an exemplary embodiment, the controller may further include a buffering unit for buffering the plurality of sampling values in a time order, and the peak power calculator includes a plurality of samplings buffered in the buffering unit for a preset time. The peak power values may be calculated by arranging the values in the order of increasing values, selecting a predetermined number of sampling values among the sorted sampling values, and calculating an average of the selected sampling values.

In an exemplary embodiment, the controller may calculate each of the RMS average power value and the peak power value for the RF signal, and output the calculated RMS average power value and the peak power value, respectively.

In example embodiments, the controller may be configured to calculate the peak power value for the RF signal when zero sampling values of the plurality of sampling values are greater than or equal to a predetermined number, and calculate the calculated peak power value as a final value of the RF signal. It can be output as a power measurement value.

In an exemplary embodiment, the RF signal may be a mobile communication signal based on a time slot structure.

According to another aspect of the present invention, there is provided a power measurement method comprising: detecting an RF signal by a power measurement method by a power measurement system; Obtaining a power measurement value for the RF signal based on the RF signal; And calculating at least one of an RMS average power value and a peak power value for the RF signal based on the power measurement value.

In an exemplary embodiment, after the obtaining of the power measurement value and before calculating at least one of an RMS average power value and a peak power value for the RF signal, the power measurement value is sampled to obtain the power measurement value. The method may further include converting the digital signal including the plurality of sampling values.

In an exemplary embodiment, after converting the power measurement value into a digital signal comprising the plurality of sampling values, before calculating at least one of an RMS average power value and a peak power value for the RF signal, the plurality of Buffering a sampling value of in chronological order; and calculating at least one of an RMS average power value and a peak power value for the RF signal may include using the buffered plurality of sampling values. The RMS average power value may be calculated, the buffered plurality of sampling values are arranged in the order of the largest value, a predetermined number of sampling values are selected in the order of the larger value of the sorted plurality of sampling values, and the selected The peak power value may be calculated by calculating an average of the sampling values.

In an exemplary embodiment, calculating at least one of an RMS average power value and a peak power value for the RF signal may include calculating the RMS average power value and the peak power value for the RF signal, respectively, RMS average power value and peak power value can be output.

In an exemplary embodiment, the calculating of at least one of the RMS average power value and the peak power value for the RF signal may include: generating a zero or more sampling values of the plurality of sampling values for the RF signal. The peak power value may be calculated, and the calculated peak power value may be output as a final power measurement value of the RF signal.

The power measurement system and the power measurement method according to the embodiments of the inventive concept may solve the problem when only the RMS power of the RF signal is measured.

In addition, the power measurement system and the power measurement method according to embodiments of the inventive concept may accurately measure the power of an RF signal without being affected by service conditions or environments.

In addition, the power measurement system and the power measurement method according to embodiments of the present disclosure can reduce the production cost of an apparatus for measuring RMS power and peak power.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a diagram illustrating a resource block of an LTE signal.

2 is a block diagram schematically illustrating some components of a power measurement system according to an embodiment of the inventive concept.

3 is a diagram illustrating a procedure of a power measurement method according to an embodiment of the inventive concept.

4 is a view for explaining step S330 of FIG. 3 in more detail.

5 is a diagram illustrating a procedure of a power measurement method according to another embodiment of the inventive concept.

The technical spirit of the present invention may be variously modified and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail with reference to the accompanying drawings. However, this is not intended to limit the technical spirit of the present invention to specific embodiments, it should be understood to include all changes, equivalents, and substitutes included in the technical idea of the present invention.

In describing the technical idea of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the gist of the technical idea of the present invention, the detailed description thereof will be omitted. In addition, numerals (eg, first, second, etc.) used in the description process of the present specification are merely identification symbols for distinguishing one component from another component.

In addition, in the present specification, when one component is referred to as "connected" or "connected" with another component, the one component may be directly connected or directly connected to the other component, but in particular It is to be understood that, unless there is an opposite substrate, it may be connected or connected via another component in the middle.

In addition, the terms "~ unit (unit)", "~ group", "~ ruler", "~ module", etc. described herein means a unit for processing at least one function or operation, which is hardware or software Or a combination of hardware and software.

In addition, it is intended to clarify that the division of the components in the present specification is only divided by the main function of each component. That is, two or more components to be described below may be combined into one component, or one component may be provided divided into two or more for each function. Each of the components to be described below may additionally perform some or all of the functions of other components in addition to the main functions of the components, and some of the main functions of each of the components are different. Of course, it may be carried out exclusively by.

Hereinafter, exemplary embodiments of the inventive concept will be described in detail with reference to the accompanying drawings.

2 is a block diagram schematically illustrating some components of a power measurement system according to an embodiment of the inventive concept. The power measurement system 200 according to an embodiment of the present invention may be a system embedded in a wireless repeater, a headend device of a distributed antenna system, or a remote device of a distributed antenna system, but the technical spirit of the present invention is not limited thereto. . For example, the power measurement system 200 may be a system embedded in a separate device, a power meter, or the like operatively connected to a wireless repeater or the like. On the other hand, although not shown in Figure 2, the power measurement system 200 according to an embodiment of the present invention is a receiver for receiving an RF signal transmitted from a base station, a mobile phone or other devices, other connected systems, devices, modules, etc. It may further include an output unit for transmitting a power measurement result.

Referring to FIG. 2, the power measurement system 200 may include a detector 210 and a controller 230.

The detector 210 may detect an input RF signal. The RF signal may be a mobile communication signal based on a time slot structure. The RF signal may be, for example, an LTE signal, a GSM signal, or the like.

The detector 210 may obtain a power measurement value corresponding to the RF signal from the sensed RF signal. The power measurement value may be an analog type signal indicating a root mean square (RMS) power level of the RF signal over a continuous time.

The controller 230 may include an analog-to-digital converter 231, a buffering unit 233, an RMS average power calculator 235, and a peak power calculator 237.

The AD converter 231 may sample the power measurement value output by the sensing unit 210 and convert the power measurement value into a digital signal including a plurality of sampling values. 2 illustrates an embodiment in which the AD converter 231 is included in the controller 230 and one module as the power measurement system 200, but the technical spirit of the present invention is not limited thereto. The AD converter 231 may be provided in the power measurement system 200 as a separate module from the controller 230. In addition, although only one AD converter 231 is illustrated in FIG. 2, the AD converter 231 may be configured in plurality in correspondence with the RMS average power calculator 235 and the peak power calculator 237. to be.

The buffering unit 233 may buffer a plurality of sampling values output from the AD converter 231. The buffering unit 233 may have a capacity to store a plurality of sampling values corresponding to a predetermined time interval. When buffering of a plurality of sampling values corresponding to a preset time interval is completed, the buffering unit 233 may transfer the buffered sampling values to the RMS average power calculator 235 and the peak power calculator 237. The sampled values may be removed and a new plurality of sampled values may be buffered. Meanwhile, although FIG. 2 illustrates that the buffering unit 233 is included in the controller 230, the buffering unit 233 may be implemented as a separate module from the controller 230.

The RMS average power calculator 235 may calculate the RMS average power value of the RF signal by using the plurality of sampling values transmitted from the buffering unit 233.

For example, the RMS average power calculator 235 may calculate an average of a plurality of sampling values to calculate an RMS average power value for the RF signal. According to the exemplary embodiment, the RMS average power calculator 235 removes an outlier having a value outside the preset normal range among the plurality of sampling values, calculates an average of the plurality of sampling values from which the outliers are removed, and calculates the RMS. The average power value can be calculated. Accordingly, the RMS average power calculator 235 may obtain the RMS average power value of the RF signal at predetermined time intervals.

The peak power calculator 237 may calculate the peak power value of the RF signal by using the plurality of sampling values transmitted from the buffering unit 233. The peak power calculation unit 237 may select a predetermined number of sampling values in order of increasing values among the plurality of sampling values, and calculate a peak power value by calculating an average of the selected sampling values.

Meanwhile, the RMS average power calculator 235 and / or the peak power calculator 237 may be included in the controller 230 as software. For example, the RMS average power calculator 235 and / or the peak power calculator 237 may be installed in the controller 230 by software.

The controller 230 may calculate respective RMS average power values and peak power values for the RF signal, and output the calculated RMS average power values and the peak power values as final power measurement values of the RF signal. In this case, the user may selectively use a power value required according to an operating state, environment, or the like of a device in which the power measurement system 200 is built.

However, the technical spirit of the present invention is not limited thereto, and the controller 230 may calculate one of an RMS average power value and a peak power value for the RF signal, and output the final power measurement value of the RF signal. Can be.

In some embodiments, controller 230 may be considered if the incoming RF signal is not full traffic (or can be considered substantially non full traffic), for example AD converter 231. If the number of sampling values of 0 among the plurality of sampling values obtained by the P2 is greater than or equal to a predetermined number, only the peak power value may be calculated through the peak power calculator 237, and the calculated peak power value is measured as the final power of the RF signal. Can be output as a value.

In another embodiment, the controller 230 may include a plurality of sampling obtained by the AD converter 231 when the input RF signal is full traffic (or may be considered substantially full traffic). If the sampling value of 0 of the values is less than a predetermined number, only the RMS average power value may be calculated through the RMS average power calculator 237, and the calculated RMS average power value may be output as a final power measurement value of the RF signal. Can be.

If the RF signal is not full traffic and there are many sampling values of 0, the reliability of the RMS average power value is reduced and the necessity of calculating the RMS average power value is reduced. Therefore, only the peak power value is calculated to be the final power measurement value of the RF signal. If there is little sampling value of 0, the reliability of the RMS average power value is increased, so that only the RMS average power value can be calculated and output as the power measurement value of the final RF signal.

The power measurement system 200 according to the embodiments of the inventive concept may calculate not only the RMS average power value of the input RF signal but also the peak power value of the RF signal. In the case of non-full traffic, the problem when only RMS power is measured can be solved.

In addition, the power measurement system 200 according to the embodiments of the present invention is configured by configuring the RMS average power calculator 235 and the peak power calculator 237 in software and associated with the detection unit 210 which is a hardware module. As a result, the size and production cost of the power measurement system 200 can be reduced.

3 is a diagram illustrating a procedure of a power measurement method according to an embodiment of the inventive concept. 4 is a view for explaining step S330 of FIG. 3 in more detail. The power measurement method shown in FIGS. 3 and 4 consists of steps that are processed in time series in the power measurement system 200 shown in FIG. 2. Therefore, even if omitted below, it can be seen that the contents described above with respect to the power measurement system 200 shown in FIG. 2 also apply to the power measurement methods of FIGS. 3 and 4.

In step S310, the power measurement system 200 obtains a power measurement value for the sensed RF signal. The power measurement system 200 may receive an RF signal from a base station, a mobile phone, or other device, and obtain a power measurement value corresponding to the input RF signal.

In operation S320, the power measurement system 200 samples the power measurement value and converts the power measurement value into a digital signal including a plurality of sampling values. The power measurement system 200 may sample the power measurement value at predetermined time intervals.

In operation S330, the power measurement system 200 calculates an RMS average power value and a peak power value based on the power measurement value converted into a digital signal.

Referring to FIG. 4 further referring to step S330, in step S410, the power measurement system 200 buffers a plurality of sampling values. The power measurement system 200 may buffer a plurality of sampling values obtained in time order for a preset time.

In operation S420, the power measurement system 200 calculates an average of the buffered plurality of sampling values to calculate an RMS average power value. According to an embodiment, the power measurement system 200 removes an outlier having a value outside the preset normal range from a plurality of buffered sampling values, calculates an average of the plurality of sampling values from which the outlier is removed, and calculates an RMS average power value. Can be calculated.

In step S430, the power measurement system 200 sorts the buffered plurality of sampling values in descending order in order of increasing values.

In operation S440, the power measurement system 200 selects a predetermined number of sampling values from the sorted sampling values. For example, the power measurement system 200 may select a predetermined number of sampling values in order of increasing values among the sorted sampling values.

In step S450, the power measurement system 200 calculates a peak power value by calculating an average of the selected sampling values.

Meanwhile, although FIG. 4 shows that step S420 is performed before steps S430 to S450, this is for convenience of description, and step S420 may be performed simultaneously with steps S430 to S450 or after S430 to S450. .

Referring back to FIG. 3, in step S340, the power measurement system 200 outputs each of the calculated RMS average power value and peak power value as the final power measurement value of the input RF signal.

5 is a diagram illustrating a procedure of a power measurement method according to another embodiment of the inventive concept. The power measurement method shown in FIG. 5 consists of steps that are processed in time series in the power measurement system 200 shown in FIG. 2. Therefore, even if omitted below, the contents described above with respect to the power measurement system 200 illustrated in FIG. 2 may be applied to the power measurement method of FIG. 5. 5 illustrates an embodiment in which the power measurement system 200 calculates any one of an RMS average power value and a peak power value with respect to an input RF signal, unlike the embodiment described with reference to FIGS. 3 and 4. It is for the drawing. Hereinafter, a description will be given focusing on differences from the embodiments described with reference to FIGS. 3 and 4.

In step S510, the power measurement system 200 obtains a power measurement value for the sensed RF signal.

In operation S520, the power measurement system 200 samples the power measurement value and converts the power measurement value into a digital signal including a plurality of sampling values.

In operation S530, the power measurement system 200 determines whether or not a sampling value of zero among the plurality of sampling values is a predetermined number or more.

If the sampling value of 0 is more than a predetermined number of the plurality of sampling values, the power measurement system 200 calculates the peak power value based on the power measurement value converted into the digital signal (S540) and converts the calculated peak power value into RF. The final power measurement value of the signal is output (S550).

If the sampling value of 0 of the plurality of sampling values is less than a predetermined number, the power measurement system 200 calculates an RMS average power value based on the power measurement value converted into the digital signal (S560), and calculates the calculated RMS average power value. This is output as a final power measurement value of the RF signal (S570).

In the above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications and changes by those skilled in the art within the spirit and scope of the present invention. This is possible.

Claims

A detector configured to detect an input radio frequency (RF) signal and output a power measurement value; And

An RMS average power calculation unit for calculating a root mean square (RMS) average power value for the RF signal based on the power measurement value and a peak power value for the RF signal based on the power measurement value. A controller having a peak power calculator;

Power measurement system comprising a.
According to claim 1,

The controller,

And an analog-digital (AD) converter for sampling the power measurement value and converting the power measurement value into a digital signal including a plurality of sampling values.

The RMS average power calculation unit calculates the RMS average power value using the plurality of sampling values,

And the peak power calculator calculates the peak power value using the plurality of sampling values.
The method of claim 2,

The controller,

A buffering unit configured to buffer the plurality of sampling values in a time order;

The peak power calculation unit,

Arranging the plurality of sampling values buffered in the buffering unit in a predetermined order for a predetermined time, selecting a predetermined number of sampling values among the sorted plurality of sampling values, calculating an average of the selected sampling values, and A power measurement system for calculating peak power values.
The method of claim 2,

The controller,

Calculating each of the RMS average power value and the peak power value for the RF signal, and outputting each of the calculated RMS average power value and the peak power value.
The method of claim 2,

The controller,

A power measurement system for calculating the peak power value for the RF signal and outputting the calculated peak power value as a final power measurement value of the RF signal when a sampling value of 0 of the plurality of sampling values is equal to or greater than a predetermined number. .
According to claim 1,

The RF signal is,

A power measurement system, which is a mobile communication signal based on a time slot structure.
In the power measurement method by the power measurement system,

Sensing an RF signal;

Obtaining a power measurement value for the RF signal based on the RF signal; And

Calculating at least one of an RMS average power value and a peak power value for the RF signal based on the power measurement value;

Power measurement method comprising a.
The method of claim 7, wherein

After calculating the power measurement value and before calculating at least one of an RMS average power value and a peak power value for the RF signal,

Sampling the power measurement value and converting the power measurement value into a digital signal including a plurality of sampling values;

Further comprising, a power measurement method.
The method of claim 8,

After converting the power measurement value into a digital signal comprising the plurality of sampling values and before calculating at least one of an RMS average power value and a peak power value for the RF signal,

Buffering the plurality of sampling values in chronological order; further comprising:

Computing at least one of the RMS average power value and the peak power value for the RF signal,

Calculate the RMS average power value using the buffered plurality of sampling values,

The peak power is arranged by arranging the buffered plurality of sampling values in the order of the largest value, selecting a predetermined number of sampling values in the order of the largest number of the sorted sampling values, and calculating an average of the selected sampling values. A power measurement method for calculating a value.
The method of claim 8,

Computing at least one of the RMS average power value and the peak power value for the RF signal,

Calculating each of the RMS average power value and the peak power value with respect to the RF signal, and outputting the calculated RMS average power value and the peak power value.
The method of claim 8,

Computing at least one of the RMS average power value and the peak power value for the RF signal,

When the sampling value of 0 of the plurality of sampling values is a predetermined number or more, the peak power value is calculated for the RF signal, and the calculated peak power value is output as a final power measurement value of the RF signal. .