KR101077335B1 - Apparatus for selecting antenna of wibro system - Google Patents

Abstract

The present invention relates to an antenna selection device for transmitting and receiving a plurality of antennas to transmit and receive predetermined data. The transmitting and receiving control unit controls the first switching switch and the second switching switch to control the first antenna and the second switching switch. The first receiver and the second receiver respectively receive signals input through the two antennas, and the transmission / reception control unit controls the first switch and the second switch according to the strength of the signals respectively received by the first receiver and the second receiver. Control to transmit the transmission signal of the transmitter through the first antenna or the second antenna.

WiBro, Primary, Diversity, Antenna Selection, Channel Environment, Transmitter

Description

Apparatus for selecting antenna of wibro system

The present invention relates to an antenna selection apparatus that allows a transmitter and a receiver to select a plurality of antennas to transmit and receive predetermined data.

The rapid development of information and communication technology is equipped with an environment in which products such as portable terminals and digital home appliances can be easily accessed through desired information. In particular, with the convergence of various services based on digitization and the Internet, the network is in a very important position according to the trend of broadband and high speed services.

Through such a network, a user may not only acquire text information but also transmit various kinds of information such as a video and a voice in real time. In addition, new means of communication, such as integrated services digital networks or cable modems, have been developed to transmit vast amounts of information.

In addition, a digital subscriber line or an asymmetric digital subscriber line has been proposed as a next-generation communication technology.

In using such communication means, the cable modem is expensive to install and use. Wireless modems have been developed to compensate for this. Also, as users' working environment changes, wireless modems are accelerating as more and more users use laptop (lap top) and notebook computers instead of traditional desktop computers.

Here, the wireless modem is a generic term for a device for wirelessly connecting to the Internet using a laptop computer or a personal portable terminal and transmitting or receiving data or making a call through a wireless public network. The wireless modem is mainly in the form of a PCMCIA (Personal Computer Memory Card International Association) supplied to a laptop computer or a personal digital assistant (PDA) and a CF type.

In accordance with this trend, wireless modems are generally installed using a universal serial bus (USB) for convenience of portability and installation.

Among the wireless modems, the Wibro system typically includes one transmitter and two receivers, and has a structure of MIMO (Multi Input Multi Output) for transmitting and receiving predetermined data using two antennas. do. In other words, the WiBro system includes a main antenna and a diversity antenna.

Among the two receiving units, one receiving unit, that is, the first receiving unit and the one transmitting unit share one antenna, for example, the first receiving unit and the transmitting unit share a primary antenna to receive predetermined data, respectively. And transmitting.

One receiver, that is, the second receiver, of the two receivers exclusively uses one antenna, that is, the second receiver monopolyizes a diversity antenna to receive predetermined data.

Therefore, when the WiBro system transmits predetermined data, an antenna having an excellent channel environment cannot be selected to transmit data. That is, when the primary antenna and the diversity antenna are provided, it is preferable to select an antenna having excellent channel environment from two antennas and transmit data.

However, although the conventional WiBro system has two antennas, the transmitter has to transmit data using only one antenna regardless of the channel environment.

Therefore, a problem to be solved by the present invention is to allow a transmitter to selectively transmit a predetermined signal using a first antenna or a second antenna according to a channel environment in a WiBro system having a first antenna and a second antenna. Provide an antenna selector.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above may be clearly understood by those skilled in the art to which the present invention pertains. There will be.

An antenna selection apparatus of the present invention includes a transmission and reception control unit for controlling transmission and reception of a signal, a first antenna and a second antenna for transmitting and receiving the signal, and a signal through the first antenna and the second antenna, respectively. A first receiver and a second receiver for outputting the signal to the transmission / reception control unit, a transmitter for transmitting a signal through the first antenna or the second antenna under the control of the transmission / reception control unit, and the control unit according to the control of the transmission / reception control unit. A first switching switch for connecting an antenna to an input terminal of the first receiver or an output terminal of the transmitter; and the second antenna to an input terminal of the second receiver or to an output terminal of the transmitter under control of the transmission / reception control unit; And a second switching switch.

In addition, the antenna selection apparatus of the present invention, the transmission and reception control unit for controlling the transmission and reception of the signal, the first antenna and the second antenna for transmitting and receiving the signal, and the signal through the first antenna and the second antenna, respectively A first receiving unit and a second receiving unit receiving and outputting the signal to the transmission and reception control unit, a transmission unit transmitting a signal through the first antenna or the second antenna according to the control of the transmission and reception control unit, and according to the control of the transmission and reception control unit, An eleventh switch for connecting an input terminal of the first receiver to the first antenna or the second antenna, and an output terminal of the transmitter or an input terminal of the second receiver according to control of the transmission / reception control unit; And a terminal selected by the twelfth switching switch according to the control of the twelfth switching switch and the transmission / reception control unit. Includes a thirteenth switch for connecting to said second antenna.

Each of the first receiver and the second receiver includes a band pass filter for filtering a signal of a frequency band set among input signals, and a low noise amplifier for low noise amplifying the signal filtered by the band pass filter.

Each of the first receiver and the second receiver includes a balun that converts an output signal of the low noise amplifier into a balanced signal and outputs the balanced signal to the transmission / reception control unit.

The transmitter includes a power amplifier for power amplifying a signal to be transmitted, and a low pass filter for low pass filtering the output signal of the power amplifier.

The transmitter may include a balun that converts a balanced signal into a balanced signal and outputs the balanced signal to the power amplifier.

The transmission / reception control unit controls the first switching switch and the second switching switch according to the strength of a signal respectively received by the first receiver and the second receiver so that the output signal of the transmitter is the first antenna or the second switch. Allow transmission through the antenna.

The transmission / reception control unit controls the eleventh switching switch and the twelfth switching switch according to the strength of the signal respectively received by the first receiver and the second receiver, so that the output signal of the transmitter is controlled by the first antenna or the second receiver. 2 Enable transmission through the antenna.

The antenna selection apparatus of the WiBro system of the present invention enables the transmitter to select and transmit one antenna having excellent channel environment among the plurality of antennas when transmitting a predetermined signal.

Therefore, it is possible to find and transmit an optimal channel for the signal transmitted by the transmitter, and to transmit a predetermined signal accurately.

The following detailed description is only illustrative, and merely illustrates embodiments of the present invention. In addition, the principles and concepts of the present invention are provided for the purpose of explanation and most useful.

Accordingly, various forms that can be implemented by those of ordinary skill in the art, as well as not intended to provide a detailed structure beyond the basic understanding of the present invention through the drawings.

1 is a view showing the configuration of a preferred embodiment of the WiBro system according to the antenna selection device of the present invention. Here, reference numeral 100 denotes a transmission / reception control unit. The transmission / reception control unit 100 controls transmission of predetermined data and processes received data.

For example, the antenna selection device of the WiBro system of the present invention is used in a user terminal such as a laptop computer and a laptop computer, and the transmission / reception control unit 100 transmits predetermined data provided by the user terminal. Controls the output of the received data to the user terminal.

Reference numeral 110 is a first antenna, and reference numeral 112 is a second antenna. For example, the first antenna 110 is a primary antenna, and the second antenna 112 is a diversity antenna. The first antenna 110 and the second antenna 112 transmits and receives data of a predetermined frequency.

Reference numeral 120 is a first receiver. The first receiver 120 includes a band pass filter 122, a low noise amplifier 124, and a balun 126, and receives a signal having a predetermined frequency from a signal input through the first antenna 110. To the transmission and reception control unit 100.

Reference numeral 130 is a second receiver. The second receiver 130 includes a band pass filter 132, a low noise amplifier 134, and a balun 136, and receives a signal having a predetermined frequency from a signal input through the second antenna 112. To the transmission and reception control unit 100.

Reference numeral 140 is a transmitter. The transmitter 140 includes a balun 142, a power amplifier 144, and a low pass filter 146. The transmitter 140 includes the first antenna 110 or predetermined data provided by the transmission / reception control unit 100. The transmission is performed through the second antenna 112.

Reference numeral 150 is a first switching switch. The first switching switch 150 is switched under the control of the transmission and reception control unit 100 to selectively select the input terminal of the first receiver 120 or the output terminal of the transmitter 140 to the first antenna 110. Connect with

Reference numeral 152 is a second switching switch. The second switching switch 152 is switched under the control of the transmission and reception control unit 100 to selectively select the output terminal of the transmitter 140 or the input terminal of the second receiver 130 to the diversity antenna 110. Connect with

An embodiment of the antenna selection apparatus of the present invention configured as described above connects the movable terminal of the first switching switch 150 to one side fixed terminal a1 when the transmission and reception control unit 100 receives predetermined data. The movable terminal of the second switching switch 152 is connected to the other fixed terminal b2.

Then, the first antenna 110 and the second antenna 112 are input terminals of the band pass filter 122 of the first receiver 120 through the first switch 150 and the second switch 152, respectively. And an input terminal of the band pass filter 132 of the second receiver 130, respectively.

In such a state, the band pass filter 122 of the first receiver 120 and the band pass filter 132 of the second receiver 130 are input from the first antenna 110 and the second antenna 112. The signals of a predetermined frequency band preset in the signal are respectively filtered.

The signals filtered by the bandpass filter 122 and the bandpass filter 132 are low noise amplified by the low noise amplifiers 124 and 134, respectively.

The low noise amplified signals of the low noise amplifiers 124 and 134 are converted into balanced signals by the baluns 126 and 136 and output to the transmission / reception control unit 100. That is, the low noise amplified signal in the low noise amplifiers 124 and 134 is an unbalanced signal, and the baluns 126 and 136 are converted to balanced signals having opposite phases and having the same level, and the transmission / reception control unit ( Output to 100).

When the transmission / reception control unit 100 transmits predetermined data, the movable terminal of the first switching switch 150 is connected to the other fixed terminal b1 or the movable terminal of the second switching switch 152. Is connected to one fixed terminal a2.

For example, the transmission / reception control unit 100 determines the strength of the signal input from the first receiver 120 and the second receiver 130. As a result of the determination, when the intensity of the signal input from the first receiver 120 is strong, the transmission / reception control unit 100 connects the movable terminal of the first switching switch 150 to the other fixed terminal b1, and When the intensity of the signal input from the second receiver 130 is strong, the transmission / reception control unit 100 connects the movable terminal of the second switching switch 152 to one fixed terminal a2.

In this state, the transmission and reception control unit 100 outputs a predetermined signal to be transmitted to the transmission unit 140. The signal output from the transmission / reception control unit 100 is converted into an unbalanced signal by the balun 142 of the transmission unit 140. That is, the signals output from the transmission / reception control unit 100 are balanced signals having opposite phases and the same magnitude, and are converted into unbalanced signals at the balun 142 of the transmitter 140.

The unbalanced signal converted by the balun 142 is power amplified by the power amplifier 144, low pass filtered by the low pass filter 146, and then applied to the first antenna 110 through the first switching switch 150. Or transmitted to the second antenna 112 via the second switch 152.

That is, according to an embodiment of the antenna selection apparatus of the present invention, each of the first receiver 120 and the second receiver 130 receives and transmits a signal input from the first antenna 110 and the second antenna 112. Output to the control unit 100. In the case where a predetermined signal is transmitted, the transmitter 140 transmits the first antenna 110 or the second antenna according to the strength of the signal received by each of the first receiver 120 and the second receiver 130. Transmit via 112.

2 is a view showing the configuration of another preferred embodiment of the WiBro system according to the antenna selection device of the present invention. Referring to FIG. 2, another embodiment of the present invention includes an eleventh switching switch 200, a twelfth switching switch 202, and a thirteenth switching switch 204 that are switched under the control of the transmission / reception control unit 100. .

That is, according to another embodiment of the present invention, the output terminal of the transmitter 140 and the input terminal of the second receiver 130 are respectively fixed to one fixed terminal a11 and the other fixed terminal b11 of the eleventh switch 200. Connected. The movable terminal of the eleventh switching switch 200 is connected to the movable terminal of the twelfth switching switch 202 so that one fixed terminal a12 and the other fixed terminal b12 of the twelfth switching switch 202 are the first antenna. 110 and second antenna 112 are respectively connected. The input terminal of the first receiver 120 is connected to the movable terminal of the thirteenth switch 204 so that one fixed terminal a13 and the other fixed terminal b13 of the thirteenth switch 204 are connected to the second antenna 112. And first antennas 110, respectively.

According to another exemplary embodiment of the present invention configured as described above, the first receiver 120 and the second receiver 130 selectively receive a predetermined signal using the first antenna 110 and the second antenna 112.

That is, when the transmission / reception control unit 100 controls the eleventh to thirteenth changeover switches 200, 202, and 204 to connect the movable terminals to the other fixed terminals b11, b12, and b13, the first antenna 110 is connected to the input terminal of the first receiving unit 120 through the thirteenth switch 204, the second antenna 112 sequentially the twelfth switch 202 and the eleventh switch 200 Through the connection to the input terminal of the second receiver 130.

Then, the first receiver 120 receives a signal received through the first antenna 110, and the second receiver 130 receives a signal received through the diversity antenna 110.

Then, the transmission and reception control unit 100 connects the movable terminal of the eleventh switching switch 200 to the other fixed terminal b11, and activates the twelfth switching switch 202 and the thirteenth switching switch 204. When the terminal is connected to one of the fixed terminals a12 and a13, the second antenna 112 is connected to the input terminal of the first receiving unit 120 through the thirteenth switching switch 204, and the first antenna ( 110 is connected to an input terminal of the second receiving unit 130 through the twelfth switching switch 202 and the eleventh switching switch 200 in sequence.

Then, the first receiver 120 receives the signal received through the second antenna 112, and the second receiver 130 receives the signal received through the first antenna 110. do.

Meanwhile, when the transmitter 140 transmits a predetermined signal, the transmitter 140 may selectively transmit the first antenna 110 or the second antenna 112 under the control of the transmission / reception control unit 100.

That is, while the transmission / reception control unit 100 connects the movable terminal of the eleventh selector switch 200 to one fixed terminal a11, the movable terminal of the twelfth selector switch 202 is connected to the fixed terminal a12 on one side. In this case, the output terminal of the transmitter 140 is connected to the first antenna 110 through the eleventh switch 200 and the twelfth switch 202 sequentially.

Then, the transmission signal output from the transmitter 140 is applied to the first antenna 110 through the eleventh switch 200 and the twelfth switch 202 sequentially and transmitted.

In addition, the transmission / reception control unit 100 connects the movable terminal of the twelfth switching switch 202 to the other fixed terminal b12 while the movable terminal of the eleventh selector switch 200 is connected to the fixed terminal a11 on one side. In this case, the output terminal of the transmitter 140 is connected to the second antenna 112 through the eleventh switch 200 and the twelfth switch 202 sequentially.

Then, the transmission signal output from the transmitter 140 is applied to the second antenna 112 through the eleventh switch 200 and the twelfth switch 202 sequentially and transmitted.

The present invention has been described in detail with reference to exemplary embodiments, but those skilled in the art to which the present invention pertains can make various modifications without departing from the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

The present invention can transmit a predetermined signal by selectively using a first antenna or a second antenna in the WiBro system, and can transmit through an antenna having excellent channel environment.

1 is a view showing the configuration of a preferred embodiment of the WiBro system according to the antenna selection device of the present invention, and

2 is a view showing the configuration of another preferred embodiment of the WiBro system according to the antenna selection device of the present invention.

Claims (8)

A transmission and reception control unit for controlling transmission and reception of a signal; A first antenna and a second antenna for transmitting and receiving the signal; A first receiver and a second receiver for receiving signals through the first and second antennas and outputting the signals to the transmission and reception controller; A transmitter for transmitting a signal through the first antenna or the second antenna under the control of the transmission / reception control unit; A first switching switch for connecting the first antenna to an input terminal of the first receiver or an output terminal of a transmitter under the control of the transmission and reception controller; And And a second switching switch for connecting the second antenna to an input terminal of the second receiver or an output terminal of a transmitter under the control of the transmission and reception controller. The transmission and reception control unit, The output signal of the transmitter is transmitted through the first antenna or the second antenna by controlling the first switch and the second switch according to the strength of the signal received by the first receiver and the second receiver, respectively. The antenna selector of the WiBro system. A transmission and reception control unit for controlling transmission and reception of a signal; A first antenna and a second antenna for transmitting and receiving the signal; A first receiver and a second receiver for receiving signals through the first and second antennas and outputting the signals to the transmission and reception controller; A transmitter for transmitting a signal through the first antenna or the second antenna under the control of the transmission / reception control unit; An eleventh switch for selecting an output terminal of the transmitter or an input terminal of the second receiver under the control of the transmission / reception control unit; A twelfth switching switch for connecting the terminal selected by the eleventh switching switch to the first antenna or the second antenna under the control of the transmission / reception control unit; And A thirteenth switch for connecting an input terminal of the first receiver to the first antenna or the second antenna according to the control of the transmission and reception controller; The transmission and reception control unit, The output signal of the transmitter is transmitted through the first antenna or the second antenna by controlling the eleventh switching switch and the twelfth switching switch according to the strength of the signal received by the first receiver and the second receiver, respectively. The antenna selector of the WiBro system. 3. The apparatus of claim 1 or 2, wherein each of the first and second receivers; A band pass filter for filtering a signal having a frequency band set among the input signals; And And a low noise amplifier for low noise amplifying the signal filtered by the band pass filter. 4. The apparatus of claim 3, wherein each of the first receiver and the second receiver; And a balun that converts the output signal of the low noise amplifier into a balanced signal and outputs the balanced signal to the transmission / reception control unit. The apparatus of claim 1 or 2, wherein the transmitting unit; A power amplifier for power amplifying the signal to be transmitted; And And a low pass filter for low pass filtering the output signal of the power amplifier. The apparatus of claim 5, wherein the transmitting unit; And a balun that converts a balanced signal into a balanced signal and outputs the balanced signal to the power amplifier. delete delete

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