KR20140073302A - Communication apparatus and method for measuring quality of signal thereof - Google Patents

Communication apparatus and method for measuring quality of signal thereof Download PDF

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Publication number
KR20140073302A
KR20140073302A KR1020120141385A KR20120141385A KR20140073302A KR 20140073302 A KR20140073302 A KR 20140073302A KR 1020120141385 A KR1020120141385 A KR 1020120141385A KR 20120141385 A KR20120141385 A KR 20120141385A KR 20140073302 A KR20140073302 A KR 20140073302A
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South Korea
Prior art keywords
signal
power
channel
reception
gain
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KR1020120141385A
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Korean (ko)
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이용수
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한국전자통신연구원
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Publication of KR20140073302A publication Critical patent/KR20140073302A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

A communication apparatus amplifies an inputted reception signal, converts the reception signal into a digital signal, and measures the quality of a signal based on the digital signal. A reception gain is calculated based on power for an automatic gain control (AGC) channel of the reception signal and the gain of the amplified reception signal is controlled according to the calculated reception gain. With regard to the reception signal whose gain is controlled, the power of a reference channel is measured and the power of a counterpart channel is measured. Based on a digital power ratio of the power of the reference channel to the power of the counterpart channel and a ratio of the reception gain of the reference channel and the reception gain of the counterpart channel, a signal-to-noise ratio is measured.

Description

[0001] DESCRIPTION [0002] COMMUNICATION APPARATUS AND METHOD FOR MEASURING SIGNAL QUALITY [0002]

The present invention relates to a communication apparatus and a method for measuring a signal quality.

During actual wireless communication, the communication device should measure the quality of various channels for link adaptation and report to the upper scheduler in real time. At this time, in order to measure the quality per radio channel, the absolute reception power should be measured for each channel. Here, there is a signal channel, which is a reference channel for measuring quality, and a noise or interference channel, which is a relative channel for obtaining a relative reception power ratio to a signal channel as a reference channel. Noise or interference channel means a channel in a band that can be reliably measured without allocating a signal for the reliability of measurement although the band is not fixed and may be distributed in all bands.

In order to measure the relative reception power ratio of a wireless channel, signals received through a reference channel and a corresponding channel corresponding thereto are subjected to reception gain processing while passing through a reception amplifier, and are digitized through an analog-to- And is output as received data. The digital reception power of the corresponding channel is measured using the reception data thus obtained, and the measured digital reception power of the corresponding channel includes the reception gain. Therefore, in a situation where the reception gain of the reference channel is the same as that of the relative channel, the ratio of the digital reception power of the reference channel to the digital reception power of the relative channel can be simply obtained.

However, in a situation where the reception gain of the reference channel is different from that of the relative channel, it is necessary to reflect the ratio of the reception gain of the reference channel and the reception gain of the relative channel to the ratio of the digital reception power of the reference channel and the digital reception power of the relative channel, The ratio can be obtained.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and a communication device capable of accurately measuring a relative reception power ratio for each channel in an environment where reception gains of wireless channels are different.

According to an aspect of the present invention, there is provided a method for measuring a signal quality, the method comprising: amplifying an input signal to convert the signal into a digital signal; Calculating a reception gain based on an AGC (Automatic Gain Control) channel power of the reception signal and adjusting a gain of the reception signal to be amplified according to the calculated reception gain; Measuring a power of a reference channel and measuring a power of the relative channel, and calculating a ratio of a power of the reference channel to a power of the relative channel, a reception power of the reference channel, To-noise ratio on the basis of the reciprocal of the ratio of the signal-to-noise ratio.

According to the embodiment of the present invention, when measuring the relative ratio of received power to each channel in the wireless communication system, not only when the reception gain per channel is the same but also when the reception gain per channel is different, The relative receive power ratio can be accurately measured.

Also, in a situation where the reception gains of the radio channels are different, the relative reception power ratio can be accurately measured by multiplying the measured digital reception power ratio of the reference channel and the relative channel by the reciprocal of the reception gain ratio of the reference channel and the relative channel.

1 is a diagram illustrating a structure of a communication apparatus according to an embodiment of the present invention.
2 is a diagram illustrating a frame structure of a received signal according to an embodiment of the present invention.
3 is a flowchart of a signal quality measurement method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out 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 order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

Hereinafter, a communication apparatus and a signal quality measurement method thereof according to an embodiment of the present invention will be described with reference to the drawings.

1 is a diagram illustrating a structure of a communication apparatus according to an embodiment of the present invention.

1, the communication device 1 according to the embodiment of the present invention includes a reception antenna 11, a reception power amplification unit 12, a signal conversion unit 13, a digital power calculation unit 14, A starting information calculating unit 15, a receiving gain calculating unit 16, an amplifier control signal generating unit 17, and a relative signal power ratio calculating unit 18.

The communication apparatus 1 according to the embodiment of the present invention multiplies the digital reception power ratio of the reference channel and the relative channel measured in the digital unit by the reciprocal of the reception gain ratio of the reference channel and the relative gain of the relative channel, . Here, the reference channel represents a signal channel for measuring quality, and the relative channel represents a noise or interference channel, which is a relative channel for obtaining a relative reception power ratio with respect to a reference signal channel. The noise or interference channel may be distributed in all bands without being band-limited, but it may represent a channel of a band that can be reliably measured without signal allocation for measurement reliability.

The signal received by the receiving antenna 11 is input to the receiving power amplifying unit 12, and the receiving power amplifying unit 12 amplifies the receiving signal according to a predetermined receiving gain and outputs the amplified receiving signal.

The signal converting unit 13 converts the amplified received signal into a digital signal and outputs the digital signal. The signal converting unit 13 includes an analog-to-digital converter (ADC).

The start information calculator 14 finds the start point of a frame for measuring the power of the received signal and provides start information corresponding to the start point to the digital power calculator 15. The start information calculating unit 14 performs a function of searching for a channel for measuring the power of a received signal and start information of a plurality of channels for automatic gain control (AGC).

The digital power calculating unit 15 calculates the power of the digital received signal output from the signal converting unit 13 and calculates the power of the received signal of the corresponding channel according to the start information.

The reception gain calculation unit 16 compares the power of the reception signal output from the digital power calculation unit 15, that is, the power of the AGC channel, with the reference power suitable for the input of the ADC 13 to calculate the reception gain of the AGC channel do. Accordingly, the reception gain for the reference channel and the reception gain for the relative channel can be calculated, respectively.

The amplifier control signal generator 17 generates and outputs an amplifier control signal for adjusting the reception power amplifier 12 based on the reception gain of the AGC channel provided from the reception gain calculator 16. [ According to the amplification control signal, the reception power amplifier 12 amplifies the reception signal to a size suitable for the input of the ADC 13 and outputs the amplified signal, thereby performing AGC.

The reception power amplifier 12, the ADC 13, the start information calculator 14, the digital power calculator 15, the reception gain calculator 16, the amplifier 13, The power for the signal received through each channel is calculated and input to the relative signal power ratio calculator 18 while AGC processing is performed through the control signal generator 17. Here, the received signal power for the reference channel and the received signal power for the relative channel are input, respectively.

The relative signal power ratio calculator 18 calculates the relative signal power ratio between the received signal power of the reference channel to be measured, that is, the digital power of the reference channel, the received signal power of the relative channel, The relative signal power ratio, that is, the relative signal power ratio is calculated based on the reception gain of the channel.

Next, a method of measuring the signal quality in such a communication apparatus will be described.

2 is a diagram illustrating a frame structure of a received signal according to an embodiment of the present invention.

As shown in FIG. 2, the received signal according to the embodiment of the present invention is composed of a superframe that periodically shows the flow of data progressing in time. The superframe includes a plurality of frames (frame # 1, frame # 2 , frame # 3, ...). Each frame also includes a plurality of subframes SF1, ..., SFn, and each subframe is also composed of a plurality of symbols (orthogonal frequency division multiplexing (OFDM) symbols).

2, P1, P2, P3, D and P4 correspond to OFDM symbols. P1 is a P1 preamble symbol used for AGC (Automatic Gain Control). When the reception gain (AGC_gain) is determined using the P1 preamble symbol, the reception gain (AGC_gain) is continuously processed in the corresponding frame. P2 is a preamble symbol but is continuous null data for bandwidth scalability. That is, assuming that only the entire band is used, for example, 1/4 of all the bands are used, 3/4 of the entire band is continuous data in which valid data is not filled. By measuring the noise power using the null interval, the noise power can be accurately measured even when the mobile station moves at a high speed.

Here, it is assumed that P3 is a reference signal for measuring the quality of an actual signal. In FIG. 2, it is assumed that there exists P2 in the first frame (frame # 1), but there is no P2 in the remaining frames and only P1 and P3.

When the signal to noise ratio (SNR) is measured for the P3 symbol in the first frame (frame # 1), AGC is first performed using P1 in the first frame (frame # 1) to obtain a first reception gain AGC_gain1). At this time, the first reception gain (AGC_gain1) is also applied when the noise power Pn is measured using the NULL data of P2 located in the same frame (frame # 1), and P3 The first reception gain (AGC_gain1) is also applied to the case of measuring the reception power Ps1 of the reference signal.

The signal-to-noise ratio (SNR) of the reference signal of P3 is measured as shown in Equation 1 below.

Figure pat00001

The signal-to-noise ratio (SNR) for the reference signal of P3 is finally Ps1 / Pn as shown in Equation (1). That is, since the reception gain (AGC_gain1) of the reference signal (P3) and the noise signal (NULL data of P2) are the same as in the first frame (frame # 1), the signal- Is determined by the ratio of the received power Ps1 of the reference signal measured at the digital stage and the noise power Pn of the noise signal.

On the other hand, in the second frame (frame # 2), there is no P2, so the noise power can not be obtained in the second frame. Since the noise power does not change well, the noise power Pn to which the first reception gain (AGC_gain1) measured in the first frame (frame # 1) is applied is used in the embodiment of the present invention. In the second frame, AGC is performed using the preamble symbol P1 of the second frame (frame # 2) to obtain a second reception gain (AGC_gain2). The second reception gain (AGC_gain2) is also applied when the reception power Ps2 of the reference signal P3 located in the same frame (frame # 2) is measured. Therefore, the signal-to-noise ratio (SNR) of the second frame (frame # 2) with respect to the reference signal P3 is measured as follows.

Figure pat00002

The signal-to-noise ratio SNR for the reference signal P3 of the second frame (frame # 2) is finally (Ps2 / Pn) * (AGC_gain1 / AGC_gain2).

Since the reception gain (AGC_gain1) of the reference signal P3 is different from the reception gain (AGC_gain1) of the noise signal (NULL of P2 in the first frame), the reception power Ps1 of the reference signal measured at the digital stage, The reciprocal ratio of the reception gains AGC_gain2 and AGC_gain1 applied when measuring the received power Ps1 of the reference signal and the noise power Pn of the noise signal are additionally multiplied.

3 is a flowchart of a signal quality measurement method according to an embodiment of the present invention.

2, the communication device 1 receives a signal received through a predetermined channel through a receiving antenna 11. [ The received signal may be a frame as shown in FIG. The received signal is amplified by the received power amplifying unit 12 and then converted into a digital signal through the ADC 13 (S100, S110).

The communication apparatus 1 uses an AGC channel (preamble symbol P1) for AGC performance and a measurement target channel (NULL of the reference signals P3 and P2) for measuring the signal quality using a reception signal converted into a digital signal as a starting point (S120).

First, the communication device 1 performs AGC processing. To this end, the digital power calculator 15 of the communication device 1 measures the digital power of the AGC channel P1 using the starting point of the AGC channel P1 (S130). That is, it measures the power of the preamble signal P1 and provides the power information of the corresponding AGC channel to the reception gain calculating unit 16, and provides it to the relative signal power ratio calculating unit 18. [

The reception gain calculating unit 16 compares the power of the AGC channel P1 with the reference power suitable for the input of the ADC 13 to calculate the reception gain of the AGC channel at step S140, (17) and a relative signal power ratio calculator (18), and may periodically provide a gain of an AGC channel for each frame.

The amplifier control signal generator 17 generates an amplifier control signal using the gain of the AGC channel and controls the received power amplifier 12 to be amplified from the received power amplifier 12 and input to the ADC 13 (S150).

Meanwhile, the digital power calculation unit 15 measures the digital power of the measurement target channels using the start point of the measurement target channel (P1, P2) provided from the start information calculation unit (S160). The power information of the measurement target channel (P1, P2) is transmitted to the relative signal power ratio calculating unit 18. [

The relative signal power ratio calculator 18 calculates a relative signal power ratio between the reception gains (for example, AGC_gain1 and AGC_gain2) of the AGC channel P1 input every frame and the power powers of the respective channels (the reception power Ps1 (S170), and calculates a relative signal power ratio, that is, a relative reception signal power ratio, using the reception gain corresponding to each frame and the power information of each channel (S180 ).

The relative signal power ratio calculator 18 can calculate the relative received signal power ratio based on Equation (2) above. As described above, considering that the reception gain calculated for each frame is applied to all signals of the same frame and the reception gain of the previous frame is applied to a frame having no noise channel, the reception gain of the reference channel and the relative gain The signal quality is measured in consideration of the reception gain ratio of the signal. In other words, the reception of a reference signal corresponding to the reference channel power (Ps1, Ps2, and so on) and the digital received-power ratio (P s1 of the noise power (Pn) corresponding to the relative channel or P s2 / P n ) by multiplying the reception gain of the reference channel by the reciprocal of the ratio of the reception gain of the relative channel to the relative reception power ratio (SNR).

The embodiments of the present invention are not limited to the above-described apparatuses and / or methods, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It belongs to the scope of right.

Claims (1)

Amplifying a received signal and converting the amplified signal into a digital signal;
Calculating a reception gain based on an AGC (Automatic Gain Control) channel power of the received signal and adjusting a gain of the amplified reception signal according to the calculated reception gain;
Measuring power of a reference channel and measuring power of a relative channel with respect to the gain-adjusted received signal; And
A step of measuring a signal-to-noise ratio based on a ratio of a ratio of a power of the reference channel to a power of the relative channel, a digital power ratio, a reception gain for the reference channel,
/ RTI >







KR1020120141385A 2012-12-06 2012-12-06 Communication apparatus and method for measuring quality of signal thereof KR20140073302A (en)

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