KR101136109B1 - System and method for measuring receive power distribution - Google Patents

Abstract

The present invention relates to a system and method for measuring a received power distribution for one or more transmission signals, and more particularly, to a system and method for measuring a reception power distribution that reflects the effects of multipath interference by one or more transmission signals. It is about.
A system for measuring a reception power distribution includes a directional antenna for receiving a radio signal transmitted from a specific direction, an antenna direction control unit for controlling a reception direction of the directional antenna, and analyzing a radio signal received by the directional antenna to determine the directional antenna. A reception power measurement unit measuring reception power of a radio signal in a reception direction, analyzing a radio signal received by the directional antenna, and analyzing a channel environment according to multipath interference of the radio signal in a reception direction of the directional antenna; The apparatus may include a channel environment analyzer and a reception power distribution measurer configured to measure a reception power distribution in all directions using the received power measured according to the reception direction of the directional antenna and the analyzed channel environment.

Description

System and Method for Measuring Received Power Distribution {SYSTEM AND METHOD FOR MEASURING RECEIVE POWER DISTRIBUTION}

The present invention relates to a system and method for measuring a received power distribution for one or more transmission signals, and more particularly, to a system and method for measuring a reception power distribution that reflects the effects of multipath interference by one or more transmission signals. It is about.

In order to provide a broadcast service in a radio broadcasting network such as a digital broadcasting network, a transmission network is designed by a cell planning scheme, and a plurality of transmitters and repeaters are installed according to the transmission network to generate coverage. The broadcast service is provided to one or more recipients located within the coverage.

In general, in order to maintain a certain level of broadcast quality, a broadcaster providing a broadcasting system configures a measuring system including a receiving antenna and measuring equipment, and measures received signals at various measuring points within service coverage to determine whether the received field strength is properly distributed. Investigate whether there is a difference between the designed broadcasting network and the actual broadcasting network and supplement the actual broadcasting network.

FIG. 1 is a diagram illustrating a reception signal measuring system in a radio broadcast transmission / reception environment using a conventional single frequency network (SFN) according to the related art.

In a single frequency network (SFN), one or more transmitters 10-1 to 10-3 and repeaters (not shown) transmit signals on the same channel, in which case one or more transmitters 10-1 to 10-3 and One or more signals received from the repeater to the receiver 30 are each received by the receiver 30 with a time difference, resulting in a multipath interference environment.

The received signal measuring system according to the related art uses the channel analyzer 31 and the power analyzer 32 to measure and analyze the multipath interference environment.

As described above, the digital broadcasting and communication system according to the related art applies an error correction code suitable for stably receiving a signal in a multipath interference environment generated for the reasons described above.

However, since digital broadcasting systems such as ATSC (Advanced Television Systems Committee) DTV are very vulnerable to multipath interference, the broadcasting network must be precisely designed and the propagation environment must be analyzed to apply a single frequency network (SFN).

In order to analyze the propagation environment, the signal environment measurement system according to the prior art measures signals received from a plurality of transmitters and repeaters at once to measure the ghost distribution in the entire power and channel. According to the present invention, it is possible to determine the channel environment at the current measurement position and antenna direction, but there is a problem in that the effects of each transmitter and repeater cannot be analyzed.

That is, the signal environment measurement system according to the related art can only determine whether the receiver operates normally in the current measurement direction and analyze the received power and channel environment, and analyze the individual effects of each transmitter and repeater. Can't.

According to the signal environment measurement system according to the related art, when the receiver is replaced, the measurement must be performed again in response to the replaced receiver, and the output of the transmitter and the repeater in the broadcasting network cannot be grasped by the transmitter and the repeater. And there was a problem that can not obtain information for position adjustment.

An embodiment of the present invention provides a system and method for receiving a wireless signal through a directional antenna capable of controlling the direction, and measuring the received power of the signal for each direction to measure the received power distribution for one or more transmitters or repeaters. I would like to.

In addition, an embodiment of the present invention does not merely measure the received power of a signal for each direction and collects the received power to measure the received power distribution. The present invention provides a system and method for calculating reception power for each ghost component according to multi-path interference and applying the calculated reception power for each ghost component to broadcasting network management.

In addition, an embodiment of the present invention is to provide a system and method that can determine whether or not the reception according to the direction of the receiver by applying the ghost processing performance information of the receiver to the calculated received power distribution data.

As a technical means for achieving the above technical problem, the first aspect of the present invention is directed to a directional antenna for receiving a radio signal transmitted from a specific direction, an antenna direction control unit for controlling the receiving direction of the directional antenna, by the directional antenna A reception power measurement unit configured to analyze a received radio signal and measure a reception power of a radio signal in a reception direction of the directional antenna; a radio signal in a reception direction of the directional antenna by analyzing a radio signal received by the directional antenna Channel environment analysis unit for analyzing the channel environment according to the multi-path interference of the receiver and reception power distribution measurement for measuring the received power distribution in all directions using the received power measured according to the receiving direction of the directional antenna and the analyzed channel environment And a reception power distribution measuring unit Synchronizing the new power and the channel environment to calculate the received power according to the channel environment, the total received power measured by the reception power measuring unit and the total ghost included in the channel environment analyzed by the channel environment analyzer ( By using the ratio of the power of each ghost component to the power of the ghost) component, it is possible to provide a system for measuring the received power distribution that calculates the received power for the radio signal corresponding to each ghost component.

In addition, the second aspect of the present invention (a) receiving a radio signal through the directional antenna, (b) by analyzing the received radio signal according to the received power and multi-path interference in the receiving direction of the directional antenna Measuring a channel environment, (c) storing the measured received power and the channel environment in correspondence with a reception direction of the directional antenna, and (d) when the received power and the channel environment are measured for all directions, And measuring a reception power distribution in all directions by using a received power and a channel environment stored in correspondence with a reception direction of a directional antenna, and in step (d), the reception power distribution measuring system includes the received power and the Synchronize the channel environment to calculate the received power according to the channel environment, and the channel environment includes information on ghost components. This will be the received power distribution measuring system may provide a method of measuring the received power distribution.

In a second aspect of the present invention, the step (d) comprises the steps of (d1) calculating the total received power using the received power of the measured signal, and (d2) the entire ghost component included in the measured channel environment. Calculating a ratio of power of each ghost component to power; (d3) calculating received power for a ghost component using the total received power and the calculated ratio; and (d4) calculating the calculated ghost component. The method may include obtaining receiveable information of the receiver according to a direction by applying a predetermined ghost processing capability of the receiver to the received power for.

According to the above-described problem solving means of the present invention, by controlling the direction of the directional antenna, receiving a radio signal for all directions, and using the received signal to analyze the received power and channel environment to transmit from one or more transmitters or repeaters The received power distribution for the wireless signal can be measured.

In addition, according to the above-described problem solving means of the present invention, by using the sum of the multi-path components and the received power in each direction, the received power corresponding to each of the multi-path for all directions to analyze the one or more transmitters or repeaters The received power distribution can be measured.

In addition, according to the above-described problem solving means of the present invention, a system capable of analyzing the channel environment of the received signal, and using the analyzed channel environment and the received power of the signal to calculate the received power for each ghost component according to the multi-path And to provide a method.

In addition, according to the aforementioned problem solving means of the present invention, it is possible to determine whether the receiver can be received in each direction by applying the ghost processing performance information of the receiver to the calculated received power distribution data.

1 is a diagram illustrating a reception signal measuring system in a radio broadcast transmission / reception environment using a conventional single frequency network (SFN) according to the prior art;
2 is a diagram illustrating a radio wave environment to which a reception power distribution measuring system according to an embodiment of the present invention is applied;
3 is a flowchart illustrating a flow of a method of measuring a received power distribution according to an embodiment of the present invention;
4 is a diagram illustrating a configuration of a reception power distribution measurement system according to an embodiment of the present invention;
5 is a diagram illustrating a result of measuring reception power distribution and reception possibility in a multi-transmitter environment according to an embodiment of the present invention;
6 is a diagram illustrating a result of measuring reception possibilities for one or more receivers in a reception power distribution system according to an embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

2 is a diagram illustrating a radio wave environment to which a reception power distribution measurement system according to an embodiment of the present invention is applied.

Received power distribution measurement system 100 receives a signal transmitted by one or more transmitters (10-1 to 10-6) located in various directions using a rotatable directional antenna, and analyzes the received signal to each signal Analyze the power and channel environment. The reception power distribution measurement system 100 generates power distribution data of a signal according to a direction by using the analyzed signal power and channel environment.

That is, the reception power distribution measurement system 100 may control the rotation of the directional antenna to receive signals from transmitters located in all directions, and analyze the signals for each direction to measure the reception power distribution of the signal.

3 is a flowchart illustrating a flow of a method of measuring a received power distribution according to an embodiment of the present invention.

In step S110, the receiving power distribution measuring system receives information about a direction in which the directional antenna is directed, that is, an angle at which the directional antenna with respect to a preset reference is directed.

Since the reception power distribution measuring system measures the reception power of signals received from all directions and the reception power distribution for each direction, the direction of the currently received signal is measured and then measured on the received power analyzed later. Match the direction.

In step S120, the receiving power distribution measuring system receives a signal through the directional antenna. The received signal is transmitted from a transmitter located in a direction in which the directional antenna faces, and the reception power distribution measuring system can determine the direction in which the transmitter is located by using the direction of the directional antenna.

In step S130, the reception power distribution measuring system analyzes the signal received in step S120 to measure the reception power and the reception channel of the signal, thereby receiving power and multipath components, for example, ghost components and the like. Calculate and analyze

For example, an 8-VSB (Vestigial Side Band) transmission signal for time t and phase shift φ ₁ is x (t), one having amplitude A, delay time τ and phase φ ₂ . When there are multiple paths of, the received signal r (t) may be represented by Equation 1.

Also, the power of the received signal r (t) calculated using Equation 1 may be calculated using Equation 2.

Equation 2 indicates that the total power of the DTV received signal may be the sum of the channel impulse response (CIR) components.

The frequency domain signal of the received signal r (t) may be calculated using Equation 3.

)(only,

)

Equation 3 shows that the spectrum of the DTV received signal has a ripple of a sine wave having a period τ and a phase Δφ, and the measured total power P _total value may be affected to some extent. Shows.

If the power difference between τ and Δφ is negligible and the power of the channel environment by measurement, i.e. the power of the main channel path and the i-th multipath component, is P _{ch _ main} and P _{ch_multipath (i)} , respectively, By synchronizing the received power and the power of the measured channel environment, the power P _main and P _{multipath (i)} of the main path and the i-th _multipath may be calculated through Equation 4.

Where N is the total number of dominant multipath components

Equation 4 shows that the received power of the radio signal corresponding to each multipath component, that is, the radio signal corresponding to the ghost component due to each multipath interference, is the power of the corresponding ghost component with respect to the total received power and the power of the total ghost component. It can be calculated using the ratio of.

In step S140, the received power and the multipath component measured and analyzed in step S130 are matched with the antenna direction information received in step S110 and stored in a database. The received power and channel information matched for the antenna direction are then used to calculate the received power distribution for all directions.

In step S150, the reception power distribution measuring system receives signals in all directions and determines whether the reception power has been measured.

In step S160, when it is determined in step S150 that the reception power for all directions is not measured, the direction of the directional antenna is changed to a preset direction. The degree of change in the direction of the directional antenna may be preset based on the performance of the directional antenna.

In step S170, when it is determined in step S150 that the received power for all directions is measured, the received power and the multipath components matched and stored for each direction in the database are stored in all directions. Generate data on the distribution of the received power.

4 is a diagram illustrating a configuration of a reception power distribution measurement system according to an embodiment of the present invention.

Received power distribution measuring system 100 according to an embodiment of the present invention is a directional antenna 110, antenna direction control unit 120, signal processing unit 130, receiving power measuring unit 140, channel environment analysis unit 150 And a reception power distribution measuring unit 160.

The directional antenna 110 receives a radio signal transmitted from a predetermined direction, and transmits the received radio signal to the signal processor 130.

The antenna direction controller 120 receives a control signal from the reception power distribution measuring unit 160 and rotates the directional antenna 110 according to the received control signal. The antenna direction controller 120 may be integrally included in the directional antenna 110 or separately installed in the directional antenna 110, and may control the direction of the directional antenna 110 by using a rotor or the like. .

The signal processor 130 amplifies the received signal for analysis of the received power and the channel environment for the signal received by the directional antenna 110, and distributes the amplified signal to receive power measurement unit 140 and the channel environment. Transmission to the analysis unit 150, respectively.

The reception power measuring unit 140 measures the reception power of the signal received from the signal processing unit 130. Measurement of the reception power by the reception power measurement unit 140 may be measured using the above Equations 1 to 4.

The channel environment analyzer 150 analyzes a signal received from the signal processor 130 to measure and analyze a multipath interference environment at a destination, for example, an influence on a received signal caused by a ghost component. . The channel environment analyzer 150 may measure a multipath interference environment by using Equations 1 to 4.

In an embodiment of the present invention, the reception power measurement unit 140 and the channel environment analysis unit 150 are described as separate components, but may be physically implemented together in one device to perform each function.

The reception power distribution measurement unit 160 calculates a distribution of reception power along a direction by using the reception power measured by the reception power measurement unit 140 and the multipath interference environment measured by the channel environment analyzer 150. Then, data including the calculated distribution of received power is generated.

The reception power distribution measurement unit 160 analyzes the reception power measured by the reception power measurement unit 140 and the multipath interference environment measured by the channel environment analysis unit 150 to correspond to each ghost component. Receive power of a signal transmitted from one or more transmitters may be calculated as a ratio of the received power of each ghost to the total received power. As such, the power distribution measurement unit 160 may calculate the reception power according to the channel environment by synchronizing the reception power and the channel environment, that is, the multipath interference environment, of the received signal with respect to a specific direction.

In addition, the reception power distribution measurement unit 160 calculates a reception angle based on the ghost processing performance of each receiver using the generated reception power distribution. Different receivers have different processing capacity for ghosts that occur due to multipath interference.

Therefore, the reception power distribution measurement unit 160 may calculate the reception possibility of each receiver by applying the reception power distribution data including the channel environment information measured for all directions to each receiver. As described above, the reception possibility of the receiver is calculated and illustrated in FIG. 6, which will be described later.

The reception power distribution measurement unit 160 may be schematically illustrated to easily identify the generated reception power distribution data. A schematic representation of the received power distribution data will be described with reference to FIG. 5.

5 is a diagram illustrating a result of measuring reception power distribution and reception possibility in a multi-transmitter environment according to an embodiment of the present invention.

Received power distribution data measured according to an embodiment of the present invention shown in Figure 5 is an angle to the signal received from the first transmitter (TxA) and the second transmitter (TxB) in the On Channel Repeater (OCR) service area. According to the received power.

According to the received power distribution data, the reception power 210 of the first transmitter TxA is smaller than the reception power 220 of the second transmitter TxB, and the reception power Tx Total 230 of the entire transmitter is 230. ) Is similar to the receive power 220 of the second transmitter TxB.

In addition, according to the illustrated received power distribution data, the received power 210 of the first transmitter TxA and the received power 220 of the second transmitter TxB are respectively the directions 240 and the first of the first transmitter TxA. 2 is distributed depending on the direction 250 of the transmitter TxB.

That is, the received power 210 of the first transmitter TxA has a large value at an angle matching the direction 240 of the first transmitter and a relatively small value at an angle not matching the direction 240 of the first transmitter. Has

Similarly, the reception power 220 of the second transmitter TxB has a large value at an angle matching the direction 250 of the second transmitter and has a relatively small value at an angle not matching the direction 250 of the second transmitter. Have

6 is a diagram illustrating a result of measuring reception possibilities for one or more receivers in a reception power distribution system according to an embodiment of the present invention.

The measurement results shown in FIG. 6 include reception possibilities for the first receiver (Rx-A) 310 and the second receiver (Rx-B) 320.

The first receiver 310 and the second receiver 320 have different ghost processing performance curves 311 and 321, thereby having different receiveable ranges 320 and 340, respectively.

One embodiment of the present invention may also be embodied in the form of a recording medium including instructions executable by a computer, such as program modules, being executed by a computer. Computer readable media can be any available media that can be accessed by a computer and includes both volatile and nonvolatile media, removable and non-removable media. In addition, computer readable media may include both computer storage media and communication media. Computer storage media includes both volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Communication media typically includes computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave, or other transmission mechanism, and includes any information delivery media.

Although the methods and systems of the present invention have been described in connection with specific embodiments, some or all of their components or operations may be implemented using a computer system having a general hardware architecture.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is shown by the following claims rather than the above description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

100: reception power distribution measurement system 110: directional antenna
140: reception power measurement unit 150: channel environment analysis unit
160: reception power distribution measuring unit

Claims (5)

In a system for measuring the received power distribution,
A directional antenna for receiving a radio signal transmitted from a specific direction,
An antenna direction control unit controlling a reception direction of the directional antenna;
A reception power measurement unit for analyzing a radio signal received by the directional antenna and measuring a reception power of the radio signal in a reception direction of the directional antenna;
A channel environment analyzer which analyzes a radio signal received by the directional antenna and analyzes a channel environment according to multipath interference of the radio signal with respect to a reception direction of the directional antenna;
Received power distribution measuring unit for measuring the received power distribution for the full orientation using the received power and the analyzed channel environment measured according to the receiving direction of the directional antenna
Including,
The received power distribution measuring unit calculates the received power according to the channel environment by synchronizing the received power and the channel environment, and analyzes the total received power measured by the received power measuring unit and the channel environment analyzer. A received power distribution measuring system for calculating a received power for a radio signal corresponding to each ghost component by using a ratio of power of each ghost component to power of total ghost components included in the environment.
The method of claim 1,
And the reception power distribution measuring unit generates receiveable information according to a direction of the receiver by applying a ghost processing capability of a receiver preset to reception power of a radio signal corresponding to each ghost component.
In the method for receiving power distribution measuring system to measure the received power distribution,
(a) receiving a wireless signal via a directional antenna,
(b) analyzing the received radio signal to measure a channel environment according to reception power and multipath interference in a reception direction of the directional antenna;
(c) storing the measured reception power and channel environment in correspondence with the reception direction of the directional antenna;
(d) when the reception power and the channel environment are measured for the entire orientation, measuring the reception power distribution for the entire orientation using the stored reception power and the channel environment matching the reception direction of the directional antenna.
Including,
In step (d), the reception power distribution measuring system synchronizes the reception power and the channel environment to calculate the reception power according to the channel environment, and the channel environment includes information on a ghost component. Receiving power distribution measurement method.
The method of claim 3, wherein
In step (d),
(d1) calculating total received power by using received power of the measured signal;
(d2) calculating a ratio of power of each ghost component to power of all ghost components included in the measured channel environment; and
(d3) calculating received power for ghost components using the total received power and the calculated ratio;
Received power distribution measuring method comprising a.
The method of claim 4, wherein
In step (d),
(d4) obtaining receiveable information of the receiver according to a direction by applying a predetermined ghost processing capability of the receiver to the calculated received power for the ghost component;
Received power distribution measurement method further comprising.

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