KR20090059882A - Apparatus for evaluating interference of wireless communication system - Google Patents

Abstract

An interference influence evaluation device of a wireless telecommunications system using synthetic transmission signal is provided to maintain interference effect by using frequency resource by evaluating interference effect of the transmission signal of wireless communications systems. A first signal generation unit(110) generates a transmission parameter and a first transmission signal. A signal receiving signal(120) receives the second transmission signal. A first power combining unit(130) synthesizes the first transmission signal and the second transmission signal. An interference evaluation unit(140) analyzes the signal and evaluates the interference effect. A control unit controls the transmission parameter.

Description

Apparatus for evaluating interference of wireless communication system

The present invention relates to an interference effect evaluation apparatus of a wireless communication system, and more particularly, by generating a transmission signal of a wireless communication system to be commercialized by adjusting a transmission parameter and a transmission signal of a wireless communication system which has been commercialized and operated. The present invention relates to an apparatus for evaluating interference effects of a wireless communication system, by synthesizing and evaluating interference effects between wireless communication systems, so that the wireless communication systems can use frequency resources fairly while maintaining the interference effects between the wireless communication systems to a minimum. .

The present invention is derived from the research conducted as part of the IT source technology development project of the Ministry of Information and Communication and the Ministry of Information and Communication Research and Development. [Task management number: 2005-S-046-03, Task name: Development of radio resource utilization-based technology].

In order to commercialize a new wireless communication system, it is necessary to allocate a frequency band for wireless communication. In this case, the allocation of the frequency band may share frequency resources already allocated to other wireless communication systems, or may allocate an unused frequency band.

Such a new wireless communication system acts as an interference source to a wireless communication system using a neighboring frequency band or a wireless communication system using the same frequency band, and adversely affects a wireless communication system that is already commercialized and operated.

That is, the wireless communication system is affected by the communication quality according to the noise level of the surroundings. If an arbitrary radio communication system increases its transmission power, radio communication systems using the same frequency band are subject to more interference, and in particular, radio communication systems using the surrounding frequency bands have out-of-band radiated signals or monotone insensitivity. Interference is affected by

Therefore, after evaluating the interference effect between the new wireless communication system and the existing wireless communication system before commercializing the new wireless communication system, if the frequency band is allocated to the new wireless communication system according to the result, The transmission parameters such as transmission power, transmission channel bandwidth, duty, and out-of-band emission must be determined.

However, it is not possible to use a new wireless communication system for the evaluation of interference effects because it takes a long time to actually appear in the market after the actual implementation of the wireless communication system to be commercialized.

In other words, even if the service concept and hardware (H / W) standard of the wireless communication system are already completed, only a part of the initial model is implemented at the laboratory level. Therefore, it takes much time for the finished product to be used for the actual interference test to come to the market. .

Thus, the evaluation of interference effects up to now has been conducted mainly for simulation.

Since the interference effect evaluation through the simulation may be different from the actual use environment, an interference effect evaluation method through a test that can be guaranteed is required, and it is a problem of the present invention to solve such a requirement.

According to the present invention, after generating a transmission signal of a wireless communication system to be commercialized by adjusting a transmission parameter, the wireless communication systems are evaluated by synthesizing the transmission signal of a wireless communication system that is commercially available and operating. It is an object of the present invention to provide an apparatus for evaluating interference effects of a wireless communication system in order to maintain a minimum interference effect between wireless communication systems while allowing a frequency resource to be used fairly.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned above can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

An apparatus of the present invention for achieving the above object is an apparatus for evaluating interference effect of a wireless communication system, comprising: first signal generating means for generating a first transmission signal according to a transmission parameter value; Signal receiving means for receiving a second transmission signal; First power synthesizing means for synthesizing a first transmission signal generated by said first signal generation means and a second transmission signal received by said signal reception means; Interference evaluation means for evaluating interference effects by analyzing the signal synthesized by the first power synthesis means; And control means for adjusting the transmission parameter value and controlling the interference evaluation means to evaluate the interference effect at the corresponding center frequency and the reception bandwidth.

In addition, another apparatus of the present invention for achieving the above object is an apparatus for evaluating interference effect of a wireless communication system, comprising: first signal generating means for generating a first transmission signal according to a first transmission parameter value; Second signal generating means for generating a second non-distorted transmission signal in accordance with a second transmission parameter value; First power synthesizing means for synthesizing the transmission signal generated by the first signal generation means and the transmission signal generated by the second signal generation means; Interference evaluation means for evaluating interference effects by analyzing the signal synthesized by the first power synthesis means; And control means for adjusting the first transmission parameter and the second transmission parameter and controlling the interference evaluation means to evaluate the interference effect at the corresponding center frequency and the reception bandwidth.

In addition, the present invention generates a signal that satisfies the spectral mask characteristics of the wireless communication system to be commercialized in order to evaluate the interference effect between the wireless communication systems through the experiment, the new wireless communication system and other wireless communication system Regardless of the type of communication used, interference effects between the two systems can be evaluated.

The present invention as described above, by generating a transmission signal of a wireless communication system to be commercialized by adjusting the transmission parameters, and then synthesized with the transmission signal of a wireless communication system that is commercialized and operated to evaluate the interference effect between the wireless communication systems, There is an effect of minimizing the interference effect between wireless communication systems while allowing the wireless communication systems to use the frequency resources fairly.

The above objects, features, and advantages will become more apparent from the detailed description given hereinafter with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains may share the technical idea of the present invention. It will be easy to implement. In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary configuration diagram of an interference impact evaluation apparatus of a wireless communication system according to the present invention.

As shown in FIG. 1, the apparatus for evaluating interference of a wireless communication system according to the present invention includes a signal generator 110 and a second wireless communication for generating a transmission signal of a first wireless communication system according to a transmission parameter value. A signal receiver 120 for receiving a transmission signal from a system, a power synthesizer 130 for synthesizing the transmission signal generated by the signal generator 110 and the transmission signal received by the signal receiver 120, and the power Interference evaluation unit 140 for evaluating the interference effect by analyzing the signal synthesized by the synthesizer 130, and adjusts the transmission parameters applied to the signal generator 110, and interference effects at the corresponding center frequency and reception bandwidth It includes a controller 150 for controlling the interference evaluation unit 140 to evaluate the.

Here, the controller 150 further performs a function of collecting the interference impact evaluation results from the interference evaluation unit 140 through the interface 143.

In addition, transmission parameters include transmission power, transmission channel bandwidth, duty, and out-of-band radiation.

Hereinafter, the components will be described in more detail.

First, the signal generator 110 may include a first signal generator 111 for generating an undistorted transmission signal of a wireless communication system (first wireless communication system) to be commercialized, and wireless communication to be commercialized. In the second signal generator 112 and the first signal generator 111 for generating an out-of-band radiation signal (intermodulation distortion signal) distorted by the nonlinear characteristic of the system (first wireless communication system). The power synthesizer 113 for synthesizing the outgoing radiation signal generated by the second signal generator 112 and the generated power signal, and the signal synthesized by the power synthesizer 113 in accordance with the change in size in free space. A first step attenuator 114 for adjustment.

Herein, the controller 150 adjusts the transmission parameter values differently so that the first signal generator 111 generates an undistorted transmission signal of the wireless communication system (first wireless communication system) to be commercialized. 2 The signal generator 112 is controlled to generate an out-of-band radiation signal (intermodulation distortion signal) distorted by the nonlinear characteristic of the wireless communication system (first wireless communication system) to be commercialized.

That is, the controller 150 causes interference by turning on / off the output of the signal generator, irregularly shifting the center frequency, or changing the occupied bandwidth to generate a transmission signal of any new transmission system. It is also possible to implement a transmission signal of a transmitter using an avoidance technique of LBT (Listen Before Talk), FH (Frequency Hopping), and DS (Direct Spectrum).

In addition, the controller 150 controls the first step attenuator 114 to attenuate the signal according to the change in size in free space.

On the other hand, if the spectrum mask of the new wireless communication system is more complicated, a signal generator is additionally used.

That is, when there are a large number of out-of-band radiation signals (intermodulation distortion signals) distorted by the nonlinear characteristics of the wireless communication system (first wireless communication system) to be commercialized, the corresponding bands using a plurality of signal generators It may also generate other radiation signals.

Next, the signal receiving unit 120 is a receiver 121 for receiving a transmission signal from a wireless communication system (second wireless communication system) that is already commercialized and operated, and the transmission signal received by the receiver 121. It includes a second step attenuator (122) for adjusting the size to change in the free space.

Next, the interference evaluator 140 measures the signal-to-noise ratio of the second wireless communication system by using the signal synthesized by the power synthesizer 130 and then uses the same or adjacent frequency. A vector signal analyzer 142 for evaluating interference effects is included.

The interference evaluator 140 additionally includes a power divider 141 for distributing the signal synthesized by the power synthesizer 130 and a signal distributed by the power divider 141 to a second wireless communication system. The apparatus may further include an interface 143 for transmitting to evaluate the interference effect through the second wireless communication system.

2 is a flowchart illustrating a method for evaluating interference effects of a wireless communication system according to the present invention.

First, a transmission signal of the first wireless communication system is generated according to a transmission parameter value (201).

That is, after generating and synthesizing the non-distorted transmission signal of the wireless communication system (first wireless communication system) to be commercialized and the out-of-band radiation signal (intermodulation distortion signal) distorted by the nonlinear characteristics, the size change in the free space The final transmission signal of the first wireless communication system is generated by adjusting to fit.

Thereafter, a transmission signal from the second wireless communication system is received (202).

Thereafter, the generated transmission signal and the received transmission signal are synthesized (203).

Thereafter, the synthesized signal is analyzed to evaluate interference effects at the corresponding center frequency and reception bandwidth (204).

That is, the signal-to-noise ratio of the second wireless communication system is measured using the synthesized signal, and then the interference effect of the first wireless communication system using the same or adjacent frequency is evaluated.

3 is a configuration diagram of another embodiment of the interference impact evaluation apparatus of the wireless communication system according to the present invention.

As shown in FIG. 3, the apparatus for evaluating interference of a wireless communication system according to the present invention includes: a first signal generator 310 for generating a transmission signal of a first wireless communication system according to a first transmission parameter value; A second signal generator 320 and a second signal generated by the first signal generator 310 and the second signal for generating an undistorted transmission signal of the second wireless communication system according to the second transmission parameter value. A power synthesizer 330 for synthesizing the transmission signal generated by the generator 320, an interference evaluator 340 for evaluating the interference effect by analyzing the signal synthesized by the power synthesizer 330, and the first And a controller 350 for adjusting the transmission parameter value and the second transmission parameter value and controlling the interference evaluator 340 to evaluate the interference effect at the corresponding center frequency and the reception bandwidth.

Here, the second signal generator 320 may include a third signal generator 321 for generating an undistorted transmission signal of the second wireless communication system according to a second transmission parameter value, and the third signal generator ( And a second step attenuator 322 for adjusting the transmission signal generated at 321 according to the change in size in free space.

In addition, the interference evaluator 340 measures the signal-to-noise ratio of the second wireless communication system using the signal synthesized by the power synthesizer 330, and then interferes with the first wireless communication system using the same or adjacent frequencies. A vector signal analyzer 342 for assessing the impact.

The interference evaluator 340 additionally includes a power divider 341 for distributing the signal synthesized by the power synthesizer 330, and a terminator 343 for terminating the signal distributed by the power divider 341. More).

4 is a flowchart illustrating another embodiment of the interference impact evaluation method of the wireless communication system according to the present invention.

First, a transmission signal of the first wireless communication system is generated according to the first transmission parameter value (401).

That is, after generating and synthesizing the non-distorted transmission signal of the wireless communication system (first wireless communication system) to be commercialized and the out-of-band radiation signal (intermodulation distortion signal) distorted by the nonlinear characteristics, the size change in the free space The final transmission signal of the first wireless communication system is generated by adjusting to fit.

Thereafter, the non-distorted transmission signal of the second wireless communication system is generated according to the second transmission parameter value (402).

Thereafter, the generated transmission signal of the first wireless communication system and the generated transmission signal of the second wireless communication system are synthesized (403).

Then, the interference effect is evaluated by analyzing the synthesized signal (404).

That is, the signal-to-noise ratio of the second wireless communication system is measured using the synthesized signal, and then the interference effect of the first wireless communication system using the same or adjacent frequency is evaluated.

5 is an exemplary view of the interference impact evaluation results of the wireless communication system according to the present invention.

As shown in FIG. 5, the interference impact evaluation result of the wireless communication system according to the present invention includes controlling the frequency bandwidth, power density, number of channels, duty and bandwidth of the interference source, center frequency, etc. of the interference source. After inputting to, select one of frequency hopping (FH), spread spectrum (DS), and pre-transmission (LBT), which is the communication method of the interference source. It shows the results of the interference effects measured by instantaneous interference power, cumulative interference power, and average interference power.

On the other hand, the method of the present invention as described above can be written in a computer program. And the code and code segments constituting the program can be easily inferred by a computer programmer in the art. In addition, the written program is stored in a computer-readable recording medium (information storage medium), and read and executed by a computer to implement the method of the present invention. The recording medium may include any type of computer readable recording medium.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention can be used for the evaluation of interference effect of a wireless communication system.

1 is a configuration diagram of an interference impact evaluation apparatus for a wireless communication system according to the present invention;

2 is a flowchart illustrating an interference impact evaluation method of a wireless communication system according to the present invention;

3 is a configuration diagram of another embodiment of an interference impact evaluation apparatus for a wireless communication system according to the present invention;

4 is a flowchart illustrating another embodiment of a method for evaluating interference effect of a wireless communication system according to the present invention;

5 is an exemplary view of the interference impact evaluation results of the wireless communication system according to the present invention.

* Explanation of symbols for the main parts of the drawings

110: signal generator 120: signal receiver

130: power synthesizer 140: interference evaluation unit

150: controller

Claims (5)

In the interference effect evaluation apparatus of a wireless communication system, First signal generating means for generating a first transmission signal in accordance with a transmission parameter value; Signal receiving means for receiving a second transmission signal; First power synthesizing means for synthesizing a first transmission signal generated by said first signal generation means and a second transmission signal received by said signal reception means; Interference evaluation means for evaluating interference effects by analyzing the signal synthesized by the first power synthesis means; And Control means for adjusting the transmission parameter value and controlling the interference evaluation means to evaluate the interference effect at the corresponding center frequency and the reception bandwidth Interference effect evaluation device of a wireless communication system comprising a. In the interference effect evaluation apparatus of a wireless communication system, First signal generating means for generating a first transmission signal in accordance with the first transmission parameter value; Second signal generating means for generating a second non-distorted transmission signal in accordance with a second transmission parameter value; First power synthesizing means for synthesizing the transmission signal generated by the first signal generation means and the transmission signal generated by the second signal generation means; Interference evaluation means for evaluating interference effects by analyzing the signal synthesized by the first power synthesis means; And Control means for adjusting the first transmission parameter and the second transmission parameter and controlling the interference evaluation means to evaluate the interference effect at the corresponding center frequency and the reception bandwidth; Interference effect evaluation device of a wireless communication system comprising a. The method according to claim 1 or 2, The control means, And an interference effect evaluation apparatus for a wireless communication system, characterized in that it further performs a function of collecting an interference effect evaluation result from the interference evaluation means. The method according to claim 1 or 2, The first signal generating means, First signal generating means for generating an undistorted transmission signal of the first wireless communication system to be commercialized; Second signal generating means for generating an out-of-band radiation signal distorted by the nonlinear characteristic of the first wireless communication system; Second power synthesizing means for synthesizing the transmission signal generated by the first signal generating means and the out-of-band radiation signal generated by the second signal generating means; And First step attenuation means for adjusting the signal synthesized by the second power synthesizing means to a change in magnitude in free space Interference effect evaluation device of a wireless communication system comprising a. The method of claim 4, wherein The interference evaluation means, Measuring the signal-to-noise ratio of the second wireless communication system using the signal synthesized by the first power synthesizing means, and then evaluating the interference effect caused by the first wireless communication system using the same or adjacent frequencies. Apparatus for evaluating interference effects of communication systems.

Images