KR20040086914A - Apparatus for measuring Rx VSWR using abandoned power and measuring method thereof - Google Patents

Abstract

PURPOSE: A device for measuring a receiving standing-wave ratio by using an abandoned power is provided to calculate an abandoned power based on a power signal outputted from a transmission antenna and a power signal abandoned to a receiving antenna, and to detect a standing-wave ratio by using the calculated abandoned power. CONSTITUTION: A transmission signal outputted through a high power amplifier(111) is delivered through the first antenna(114), but a portion of the signal is substantially abandoned. The first directional coupler(210) is mounted on the first antenna(114) of a transmission circuit(110), and supplies a power signal to a detector(300) through a forward port(211). The second directional coupler(220) is mounted on the second antenna(123) of a receiving circuit(120), and supplies an abandoned power signal received through a reverse port(222) to the detector(300). The detector(300) calculates an abandoned power from the transmitted power signals, and measures a standing-wave ratio.

Description

Apparatus for measuring Rx VSWR using abandoned power and measuring method

The present invention relates to an apparatus and method for measuring a standing wave ratio of a receiving antenna of a mobile communication base station or repeater. More particularly, the present invention relates to an apparatus and method for measuring the standing wave ratio of a receiving antenna using antenna induced power without any separate transmission equipment.

1 is a diagram schematically illustrating a structure of a base station including a diversity antenna.

The base station 100 shown in FIG. 1 illustrates a base station including a diversity antenna among various base station types. Antenna diversity improves reception characteristics by separately receiving signals arriving by various paths of spatial or temporal propagation of RF propagation between the base station and the antenna. Diversity in the spatial sense is also referred to as antenna diversity because it is basically implemented by installing a plurality of transmitting and receiving antennas. This can be applied to the antenna transmission circuit and the reception circuit, but mainly considering the reception diversity in consideration of the economic and performance improvement effect of the system implementation.

The base station 100 largely includes a transmission / reception circuit 110, a diversity reception circuit 120, a first antenna 114, and a second antenna 123. In the base station shown in FIG. 1, the first antenna 114 is used for both transmission and reception, and the second antenna 123 is used for reception. The second antenna is a diversity antenna, and forms a diversity path and is used for antenna diversity.

The transmit / receive circuit 110 transmits a signal transmitted from a transmitter (not shown) to the first antenna 114 through a high power amplifier 111 and received by the first antenna 114. Is transmitted to a receiver (not shown) via a low noise amplifier 113. The duplexer 112 is used to connect the transmitting and receiving circuits so that the first antenna can be used for both transmitting and receiving. The transmission / reception circuit further includes a bandpass filter for selecting a desired channel band, and may be configured in various forms to further add as a separate antenna without the duplexer, and is not limited to the circuit shown in FIG. 1. .

The receiving circuit 120 includes a bandpass filter 121 and a low noise amplifier 122 for selecting a desired channel from the RF signal received from the second antenna.

The first antenna and the second antenna may constitute the same directional sector in pairs, and the base station antenna may be configured to transmit and receive a plurality of sectors.

Voltage standing-wave ratio (VSWR) refers to the ratio of voltages measured at adjacent fractures and breaks in a line or waveguide with standing waves, or to the maximum value of a wave that proceeds as a comparison of magnitude values of voltage waveforms. It means the minimum value of traveling wave. Hereinafter, for convenience, it is referred to as standing wave ratio (VSWR).

For example, in two mediums having two different impedances, traveling waves are divided into traveling waves and reflected waves by impedance mismatch, and the difference between the two waves is the standing wave ratio. Reflection coefficient In this case, the standing wave ratio VSWR may be defined as in Equation 1 below.

In other words, the standing wave ratio of 1 means that the incident wave passes through completely matched with the line impedance and the termination impedance, and the incident wave is reflected more as it is larger than 1, so that the standing wave ratio checks whether there is an antenna abnormality. It is an important indicator.

2 illustrates a method of measuring the reception standing wave ratio of the second antenna 123 according to the related art.

Since the receiving circuit 120 does not have its own output device like the high output amplifying device 111, the prior art has a separate transmitting circuit 12. The voltage signals output at intervals of time from the two output transmitter circuits are respectively input to the forward port 21 and the reverse port 22 of the directional coupler 20, and the input signals are input to the receiver circuit and the antenna according to the directionality. Each is transmitted. Here, the reflected signal of the reverse signal transmitted to the antenna is moved back to the receiving circuit and received with the forward signal at the detector 11 through a port formed in the receiving circuit. The detector signal calculates a reception standing wave ratio based on the power of the received signal.

However, the above-described conventional technique requires the standing wave ratio measuring method to include a separate transmission circuit 12 and a detector 11 according to the above-mentioned method, which leads to an increase in the cost of detection equipment. In addition, in various base station equipment, it is difficult to provide a transmission circuit that satisfies the characteristics of the line, there is a problem that the general purpose is poor because the receiving circuit requires a separate port for measuring the standing wave ratio.

An object of the present invention is to provide a method and apparatus for measuring standing wave ratio of a receiving antenna or diversity antenna without a separate transmitting device in order to solve the above-mentioned problems of the prior art. More specifically, an object of the present invention is to provide a receiving standing wave ratio measuring method and measuring apparatus considering the characteristics of each base station at low cost using antenna induced power.

1 is a diagram illustrating a structure of a base station having a diversity antenna.

2 is a diagram illustrating a method for measuring a reception standing wave ratio of the related art.

3 is a diagram illustrating a method of measuring a reception standing wave ratio according to an embodiment of the present invention.

4 is a block diagram showing the configuration of a detector according to an embodiment of the present invention.

5 is a flowchart illustrating a standing wave ratio measurement flow according to an embodiment of the present invention.

*** Description of the symbols for the main parts of the drawings ***

110: transmitting circuit 120: receiving circuit 112: duplexer

210, 220: Directional coupler 300: Standing wave ratio detector

In order to achieve the above object of the present invention, the apparatus for measuring the reception standing wave ratio of the base station according to the present invention, the first directional coupler for extracting the first power signal output from the transmitting circuit to the first antenna; A second directional coupler for extracting a second power signal transmitted from the second antenna to a receiving circuit; And a standing wave ratio detector for detecting a standing wave ratio of the second antenna based on the first power signal and the second power signal. Here, the second power signal is a power signal induced from the first antenna to the second antenna.

The standing wave ratio detector also includes a pre-created organic power to standing wave ratio table.

In addition, the standing wave ratio detector according to an aspect of the present invention, the first power signal measuring unit for measuring the first power signal; A second power signal measuring unit measuring a second power signal; The apparatus may further include an organic power calculator configured to calculate organic power with respect to a predetermined first power signal based on the second power signal.

The standing wave ratio detector may include: a standing wave ratio detection unit configured to detect a standing wave ratio corresponding to the calculated organic power in an organic power to standing wave ratio table; A standing wave ratio calculator for outputting the detected standing wave ratio; The apparatus may further include a controller configured to control the organic power calculator, a standing wave ratio detector, and a standing wave ratio calculator.

According to an aspect of the present invention, a method for measuring a reception standing wave ratio includes: (a) extracting a first power signal output from a transmitting circuit to a first antenna; (b) extracting a second power signal received from the second antenna into the receiving circuit; (c) calculating organic power induced from the first antenna to the second antenna based on the first power signal and the second power signal; (d) detecting the standing wave ratio of the second antenna by using the calculated organic power and the previously prepared organic power to standing wave ratio table.

Here, the method may further include calculating the average value by repeating steps (a) to (d) a plurality of times.

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. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification. (When a part is connected to another part, this includes not only a directly connected part but also an electrically connected part with another element in between.)

Now according to an embodiment of the present invention will be described in detail with reference to the drawings.

3 illustrates a structure of a method and apparatus for measuring reception standing wave ratio according to an embodiment of the present invention.

The receiving standing wave ratio measuring apparatus according to the embodiment of the present invention includes a first directional coupler 210 mounted on a transmission antenna line, a second directional coupler 220 mounted on a reception-only antenna line, and the couplers 210 and 220. It includes a standing wave ratio measuring unit 300 for receiving the transmitted power signal to detect the standing wave ratio.

Hereinafter, the function of each apparatus will be described in relation to the components of the base station.

The transmission signal output through the high output amplifier 111 is transmitted through the first antenna 114, but in reality, some of the power signal is discarded. The induced power is directed to an adjacent receive-only antenna constituting one sector. The induced power is related to the output size of the transmitting circuit and the line and antenna characteristics of the base station. For example, the output power output from the transmitting circuit is approximately proportional to the power induced in the receiving antenna.

The first directional coupler 210 is mounted to the first antenna of the transmission circuit 110 and supplies a power signal to the detector 300 through the forward port 211.

The second directional coupler 220 is mounted to the second antenna of the receiving circuit 120 and supplies the organic power signal received through the reverse port 222 to the detector 300.

The detector 300 calculates the induced power from the transmitted power signals and measures the standing wave ratio using the measured power.

4 is a block diagram illustrating an internal configuration of the standing wave ratio measuring device 300 shown in FIG. 3.

The standing wave ratio measuring unit 300 includes a first input unit and a second input unit receiving at least two signals, a first power measuring unit and a second power measuring unit measuring power of the input signal. Based on the measured first power and the second power, the organic power calculator 320 calculates the organic power received by the receiving circuit. For example, the second power value measured when the predetermined first power value is reached is calculated as the organic power induced in the second antenna.

The standing wave ratio detection unit 330 detects the standing wave ratio by referring to the calculated organic power and the organic power to standing wave ratio table 350 previously prepared for the base station. The organic power to standing wave ratio table 350 creates a table in which the received standing wave ratio corresponds to standing wave ratios ranging from 1 to a predetermined range and received organic power.

The standing wave ratio corresponding to the organic power is detected in the table 350, and the standing wave ratio calculator may output and display the standing wave ratio. The controller 360 controls the operations of the aforementioned organic power calculator 320, the standing wave ratio detector 330, and the standing wave ratio calculator 340.

Since the magnitude of the output signal of the transmitting circuit may vary, the above-mentioned standing wave ratio measurement may be performed multiple times to obtain more accurate results, for example, to obtain an average value or remove the maximum / minimum value. Alternatively, the average value may be calculated by giving weights to the most overlapping values.

5 is a flowchart illustrating a standing wave ratio measuring method according to an embodiment of the present invention in each step.

In step S110, the first power of the signal output from the transmitting circuit is measured, and in step S120, the second power of the signal received by the receiving circuit is measured. Based on the first power and the second power, the induced power received by the receiving circuit is calculated (S130). The first power value may be used to calculate an output power value that is a reference for the first antenna, and the second power value is used to calculate an organic power value received by the second antenna for a predetermined first power value. Can be.

In step S140, the standing wave ratio corresponding to the received organic power is searched in the organic power to standing wave ratio table 350 based on the first power value and the second power value. The retrieved standing wave ratio is calculated as a standing wave ratio measurement value in step S150 (S160).

The standing wave ratio measuring method may continue measuring until a predetermined number of measurement times (for example, 40 times) and determine the received standing wave ratio by measuring an average value (S160, S190, and S200).

According to the above-described embodiment of the present invention, the reception standing wave ratio may be measured using an output device of the base station itself without a separate transmitter. In addition, using the preset organic power to standing wave ratio table, the standing wave ratio can be measured by only searching the table without complicated calculation.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

The receiving standing wave ratio measuring apparatus and measuring method according to the above-described configuration of the present invention do not need a separate transmitting apparatus, and have a remarkable effect of measuring the standing wave ratio which can estimate the performance of the receiving antenna of each base station by simple calculation. do.

Claims (9)

In the apparatus for measuring the reception standing wave ratio of the base station: A first directional coupler for extracting a first power signal output from the transmission circuit to the first antenna; A second directional coupler for extracting a second power signal transmitted from the second antenna to a receiving circuit; A standing wave ratio detector for detecting a standing wave ratio of the second antenna based on the first power signal and the second power signal, And the second power signal is a power signal induced from the first antenna to the second antenna. The method of claim 1, And the standing wave ratio detector comprises a previously prepared organic power to standing wave ratio table. The method of claim 1, The first antenna is a transmitting and receiving antenna, and the second antenna is a reception standing wave ratio measuring apparatus. The method of claim 2, The standing wave ratio detector, A first power signal measuring unit measuring the first power signal; A second power signal measuring unit measuring a second power signal; And an organic power calculator configured to calculate the second power for the first predetermined power as organic power. The method of claim 4, wherein The standing wave ratio detector, A standing wave ratio detector for detecting a standing wave ratio corresponding to the calculated organic power in an organic power to standing wave ratio table; A standing wave ratio calculator for outputting the detected standing wave ratios; And a control unit for controlling the organic power calculator, a standing wave ratio detector, and a standing wave ratio calculator. In the method for measuring the reception standing wave ratio of the base station: (a) extracting a first power signal output from the transmitting circuit to the first antenna; (b) extracting a second power signal received from the second antenna into the receiving circuit; (c) calculating organic power induced from the first antenna to the second antenna based on the first power signal and the second power signal; (d) detecting the standing wave ratio of the second antenna using the calculated organic power and the previously prepared organic power to standing wave ratio table; Received standing wave ratio detection method comprising a. The method of claim 6, In step (c), Measuring power of the first power signal and the second power signal, respectively; And calculating the received second power as organic power for a predetermined first power. The method of claim 7, wherein And repeating steps (a) to (d) a plurality of times and calculating an average value thereof. The method of claim 8, A received standing wave ratio detection method for obtaining an average value by weighting an overlapping value among calculated standing wave ratios.