KR20110065220A

KR20110065220A - Method for transmitting and receiving rf signal, receiving apparatus and display apparatus thereof

Info

Publication number: KR20110065220A
Application number: KR1020090122102A
Authority: KR
Inventors: 장지환
Original assignee: 엘지전자 주식회사
Priority date: 2009-12-09
Filing date: 2009-12-09
Publication date: 2011-06-15

Abstract

The present invention relates to a signal transmission and reception method, a receiving device and a display device using the same, the method comprising the steps of: receiving a media signal from a transmitting device connected to a wireless network, and measuring a signal reception sensitivity; And changing an intermediate frequency (IF) when the measured signal reception sensitivity is less than or equal to a reference value.

Description

Method for transmitting and receiving RF signal, receiving apparatus and display apparatus using the same

The present invention relates to a signal receiving method, a receiving apparatus and a display apparatus using the same, and more particularly, to a method and apparatus for transmitting and receiving a media signal using wireless communication.

In general, a display device includes a broadcast receiving unit that receives and processes a media signal from an airwave, a cable, and other external devices (VCR, DVD, etc.) and outputs it, and a display unit that displays an image of the processed media signal on a screen. Can be.

On the other hand, the broadcast receiving unit and the display unit may be configured separately, each of which is a wireless (wireless) method of transmitting and displaying the media signal received recently using a separate receiving device to the display device using a wireless communication Display systems are provided.

An object of the present invention is to provide a signal transmission and reception method and apparatus capable of efficiently transmitting and receiving media signals using wireless communication.

According to an aspect of the present invention, there is provided a signal reception method comprising: receiving a media signal from a transmission device connected through a wireless network, and measuring a signal reception sensitivity; And changing an intermediate frequency (IF) when the measured signal reception sensitivity is less than or equal to a reference value.

According to an aspect of the present invention, there is provided a transmission method comprising: transmitting a media signal to a reception device connected through a wireless network, and measuring signal reception sensitivity; Changing an intermediate frequency (IF) when the measured signal reception sensitivity is less than or equal to a reference value; Converting a signal to be transmitted to the receiving device into a signal of the changed intermediate frequency.

According to an embodiment of the present invention, a receiving apparatus includes: an RF receiving unit receiving a media signal from a transmitting apparatus connected to a wireless network, and converting a signal received from the transmitting apparatus into a signal having an intermediate frequency (IF); And a base band unit processing a signal of an intermediate frequency output from the RF receiver, wherein the intermediate frequency is varied according to signal reception sensitivity.

The display device according to the embodiment of the present invention may be configured to include the receiving device.

In addition, the signal receiving method may be implemented as a computer-readable recording medium recording a program for execution in a computer.

According to an embodiment of the present invention, by changing the intermediate frequency (IF) according to the signal reception sensitivity, it is possible to reduce the signal transmission and reception errors due to signal interference in the media access control (MAC) layer.

Hereinafter, a method and apparatus for transmitting and receiving a signal according to an embodiment of the present invention and a display apparatus using the same will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating an embodiment of a configuration of a signal transmission / reception system, and the signal transmission / reception system may include a transmission device 100 and a reception device 200.

Referring to FIG. 1, the transmission apparatus 100 receives a media signal including an image from an airwave, a cable, or an external device, and converts the received media signal into data in a wireless transmission format for wireless transmission. do.

The receiving device 200 receives and processes data wirelessly transmitted from the transmitting device 100, and for this purpose, at least one wireless communication standard for wirelessly transmitting and receiving data between the transmitting device 100 and the receiving device 200 is provided. It may be set in advance.

On the other hand, the transmitting device 100 is an HDMI (High-Definition Multimedia Interface) terminal, USB (Universal Serial Bus) terminal, component terminal, external input terminal, RGB terminal, Various input terminals such as an antenna cable terminal may be provided to receive a media signal using the input terminal.

The transmitting device 100 may be a set-top box (STB) that receives a media signal using a wired or wireless network, converts the received media signal and wirelessly transmits the received media signal to the receiving device 200.

However, the transmitting apparatus 100 according to the present invention is not limited to the set top box STB, and may include any kind of apparatus capable of receiving a media signal transmitted from the outside and wirelessly transmitting it to the receiving apparatus 200. .

For example, the transmitting device 100 according to the present invention may be provided in a portable terminal such as a computer or a mobile phone.

In addition, the reception apparatus 200 may receive and process data transmitted wirelessly from the transmission apparatus 100 and then transmit the data to an external device that outputs an image or audio included in a media signal.

For example, the reception apparatus 200 may convert an image signal wirelessly transmitted from the transmission apparatus 100 into a form that can be displayed on a display apparatus (not shown) and then output the converted image signal. More specifically, when the video signal wirelessly transmitted from the transmitting device 100 is encoded by a coding scheme such as MPEG, the receiving device 200 decodes the received video signal. And output to a display device (not shown).

According to an embodiment of the present invention, the transmitting device 100 and the receiving device 200 may be connected to various wireless communication standards, for example, wireless HD (WiHD), wireless home digital interface (WHDi), or wireless LAN (WiFi). Media signals may be transmitted and received using communication standards.

The WiHD uses a frequency band of about 60 GHz and transmits and receives data at a transmission rate of about 4 Gbps, thereby enabling transmission without compressing HD image data of 1080p (1920 × 1080). However, since the WiHD uses a high frequency of 60 GHz band, the data transmission / reception distance is about 10 m, and the transmission / reception quality may be easily affected by peripheral obstacles in the installation space.

The WHDi may transmit and receive data at a transmission rate of about 1.8 Gbps using a frequency band of about 5 GHz. In addition, since the WHDi uses a relatively low frequency band of 5 GHz, the transmission / reception distance is about 30 m, and the transmission / reception quality may not be greatly influenced by peripheral obstacles in the installation space. On the other hand, according to a transmission rate of about 1.8 Gbps, when the HD video data of 1080p (1920 x 1080) is to be transmitted using the WHDi, the transmitter 100 needs to compress and transmit the HD video data.

In addition, the WiFi may transmit and receive data at a transmission rate of about 54 Mbp using a frequency band of 2.4 GHz. Since the WiFi uses a low frequency band of 2.4 GHz, the transmission and reception distance is about 50 to 200 m, and the transmission and reception quality may be almost unaffected by peripheral obstacles in the installation space. On the other hand, according to a low transmission rate of about 54Mbp, if you want to transmit 1080p (1920 × 1080) HD video data using the WiFi, the transmitting device 100 must compress and transmit the HD video data, accordingly An image quality deterioration may occur in an image signal received by the reception apparatus 200.

Meanwhile, in addition to the wireless communication standard described above, the transmitting device 100 and the receiving device 200 may use various short range wireless communication standards such as Bluetooth, ZigBee, or binary CDMA. It is possible to wirelessly transmit and receive data according to a media signal using communication standards such as).

The transmitting apparatus 100 and the receiving apparatus 200 may transmit and receive video and audio data using a plurality of wireless communication standards among the various wireless communication standards as described above.

That is, the transmission apparatus 100 may support two or more wireless communication standards, and may convert the same media signal received from the outside into two or more signals according to the wireless communication standards and then wirelessly transmit the same.

In addition, the receiving device 200 may also support the two or more wireless communication standards, and may receive two or more signals wirelessly transmitted from the transmitting device 100 using different wireless communication standards.

2 is a block diagram illustrating another embodiment of the configuration of the signal transmission and reception system, and the signal transmission and reception system may include a transmission apparatus 100 and a plurality of reception apparatuses 200, 210, and 220.

Referring to FIG. 2, the transmitting device 100 may be connected to the plurality of receiving devices 200, 210, and 220 through a wireless network. That is, the transmitting apparatus 100 may convert the media signal wirelessly transmitted data received from the outside and then wirelessly transmit the data to at least one of the plurality of receiving apparatuses 200, 210, and 220.

For example, the transmitting device 100 may select one or more receiving devices from among a plurality of receiving devices 200, 210, and 220 to receive a media signal, and select the media signal received from the outside by the user. Wireless transmission to the receiving device.

To this end, the transmitter 100 may include a plurality of wireless transmitters (not shown) corresponding to each of the plurality of receivers 200, 210, and 220, and each of the plurality of wireless transmitters (not shown). May wirelessly transmit video and audio data to a corresponding receiving device.

The wireless communication standard for data transmission and reception may be the same or different from each other in each of the plurality of receiving apparatuses 200, 210, and 220. For example, wireless communication standards for receiving data from each of the plurality of receiving devices 200, 210, and 220 are different from each other according to the performance or the installation location of each of the plurality of receiving devices 200, 210, and 220. May be set.

Meanwhile, the transmitting device 100 may include a number smaller than the number of the plurality of receiving devices 200, 210, and 220, for example, one wireless transmitter (not shown). In this case, the transmitting device 100 ) May wirelessly transmit data using multi-channel communication, that is, using a plurality of channels corresponding to each of the plurality of receiving apparatuses 200, 210, and 220.

However, since the frequency that can be occupied for a specific wireless communication scheme is limited to a certain range and the bandwidth of the channel is limited, channel expansion in the RF stage may not be easy.

For example, in the case of the WIHD communication standard, the occupied frequency is limited to 57 to 64 GHz, and the channel bandwidth is 2 GHz, so that up to four channels can be extended. In addition, only one of the four channels may be available.

Therefore, as shown in FIG. 2, when the transmitting device 100 transmits a signal by connecting to a plurality of receiving devices 200, 210, and 220 through a wireless network, a media access control (MAC) stage is used. Channel interference may occur, resulting in errors in the transmission and reception of media signals.

According to an embodiment of the present invention, when the transmitting device 100 is connected to the plurality of receiving devices 200, 210, and 220 through a wireless network to transmit a signal, an intermediate frequency (IF) according to the signal reception sensitivity is used. ) To reduce interference at the media access control (MAC) stage.

3 is a block diagram illustrating another embodiment of a configuration of a signal transmission and reception system, and description of the same elements as those described with reference to FIGS. 1 and 2 in the configuration of the transmission and reception system illustrated in FIG. 3 will be omitted below. do.

Referring to FIG. 3, the broadcast reception device 200 according to an embodiment of the present invention may be connected to a plurality of broadcast transmission devices 100, 110, and 120 through a wireless network, and thus, a plurality of broadcast transmission devices ( A broadcast signal, for example, a video signal and an audio signal, may be received from any one of 100, 110, and 120.

For example, each of the plurality of broadcast transmitting devices 100, 110, and 120 converts a broadcast signal received from the outside into data that can be wirelessly transmitted according to a specific wireless communication standard and then wirelessly transmits the data to the broadcast receiving device 200. Can be.

Meanwhile, the user of the broadcast reception device 200 may select a broadcast transmission device to receive a broadcast signal from among the broadcast transmission devices 100, 110, and 120, and accordingly, the broadcast reception device 200 may select the selected broadcast. Broadcast signals, for example, video signals and audio signals may be wirelessly received from the transmitting apparatus.

To this end, the broadcast reception device 200 may include a plurality of RF receivers (not shown) corresponding to each of the plurality of broadcast transmission devices 100, 110, and 120, and a plurality of RF receivers (not shown). ) May wirelessly receive the video and audio signals with the corresponding broadcast transmitter.

The wireless communication standard for data transmission and reception may be the same or different from each other in each of the plurality of broadcast transmission apparatuses 100, 110, and 120. For example, according to performance or installation location of each of the plurality of broadcast transmitting devices 100, 110, 120, and the like, each of the plurality of broadcast transmitting devices 100, 110, 120 has a wireless communication standard for receiving data. It may be set differently from each other.

Meanwhile, the broadcast reception device 200 may include a number smaller than the number of the broadcast transmission devices 100, 110, and 120, for example, one RF receiver (not shown). In this case, the broadcast reception device The 200 may receive data using multi-channel communication, that is, using a plurality of channels corresponding to each of the plurality of broadcast transmission apparatuses 100, 110, and 120.

As described above, even when the receiving device 200 receives a signal by being connected to the plurality of transmitting devices 100, 110, and 120 through a wireless network, channel interference is performed at a media access control (MAC) stage. This may occur, which may cause an error in transmitting and receiving media signals.

According to an embodiment of the present invention, when the receiving device 200 is connected to the plurality of transmitting devices 100, 110, and 120 through a wireless network to receive a signal, an intermediate frequency (IF) according to the signal reception sensitivity is provided. ) To reduce interference at the media access control (MAC) stage.

4 is a block diagram illustrating a configuration of a transmitter according to an exemplary embodiment of the present invention. The illustrated transmitter 100 may include a base band unit 110 and an RF transmitter 120. .

Referring to FIG. 4, the base band unit 110 of the transmitting device 100 may include a media access control (MAC) layer 113 and a physical (PHY) layer 114.

The signal processor 111 may process the media signal received from the outside and output the media signal to the controller 112. For example, the signal processor 111 may include a frame buffer (not shown), and store an image signal received from the outside in the frame buffer and output the image signal according to a preset format. have.

The control unit 112 controls the overall operation of the transmitting apparatus 100, and for example, a signal output from the signal processing unit 111 may include the media access control (MAC) layer 113 and the physical (PHY) layer 114. After the conversion to a form capable of wireless transmission according to a specific wireless communication standard can be controlled to be wirelessly transmitted through the RF transmitter 120.

According to an embodiment of the present invention, in order for the transmission apparatus 100 to support a plurality of different communication schemes, the media access control (MAC) layer 113 of the baseband unit 110 corresponds to each of the different communication schemes. It may be configured to include a plurality of media access control (MAC) layers.

That is, the media access control (MAC) layer 113 may include a first media access control (MAC) layer corresponding to a first wireless communication scheme and a second media corresponding to a second wireless communication scheme different from the first wireless communication scheme. It can be configured to include an access control (MAC) layer.

The control unit 112 outputs a signal output from the signal processing unit 111 to the media access control (MAC) layer 113, and the media access control (MAC) layer 113 provides a media signal according to a preset wireless communication standard. Can be converted into data that can be transmitted wirelessly.

The converted signal is transferred to the RF transmitter 120 through the physical (PHY) layer 114, and the RF transmitter 120 may wirelessly transmit the converted signal.

Meanwhile, the RF transmitter 120 may include up converters and down converters corresponding to each of the frequency bands, and may not only transmit a signal as described above but also wirelessly receive a signal from the outside.

According to an embodiment of the present invention, the controller 112 may measure the signal reception sensitivity and change the intermediate frequency (IF) when the measured signal reception sensitivity is less than or equal to the reference value.

For example, the controller 112 measures a packet error rate (PER) or a received signal strength (RSSI) as the signal reception sensitivity, and then compares the measured value with a preset reference value. Can be.

Referring to FIG. 6, the RF transmitter 120 may include a plurality of mixers and amplifiers, and may use the IQ data input from the base band unit 110 to intermediate frequencies IF1 and IF2. Can be converted into a signal having

In addition, the RF transmitter 120 may wirelessly transmit the signals of the intermediate frequencies IF1 and IF2 to a frequency of a signal to be finally transmitted by using a transmission frequency, that is, an antenna.

For example, in the case of the WIHD communication standard, the RF transmitter 120 may raise the frequency of the intermediate frequencies IF1 and IF2 to 60 GHz and then wirelessly transmit the antenna using an antenna or the like.

As described above, by changing the intermediate frequency (IF), the controller 112 may reduce the occurrence of channel interference in the media access control (MAC) layer 113 of the base band unit 110. .

More specifically, the control unit 112 determines that channel interference has occurred in the media access control (MAC) layer 113 when the reception sensitivity is lower than a reference value, and the intermediate frequency is changed from (IF1, IF2) to (IF3, IF4). Can be changed to

Accordingly, collision with other devices input at the same intermediate frequencies IF1 and IF2 in the media access control (MAC) layer 113 can be reduced.

Referring to FIG. 7, the RF transmitter 120 may further include converters 300 and 310 for signal conversion according to the changed intermediate frequencies IF3 and IF4. The converters 300 and 310 may be further provided. Each may include a plurality of mixers and amplifiers for the intermediate frequencies IF3 and IF4.

FIG. 5 is a block diagram illustrating a configuration of a receiver according to an exemplary embodiment of the present invention. The illustrated receiver 200 may include a base band unit 210 and an RF receiver 120. . A description of the same configuration as that described with reference to FIG. 4 among the components of the reception apparatus illustrated in FIG. 5 will be omitted below.

Referring to FIG. 5, the RF receiver 220 receives a video and audio signal transmitted from the transmitting apparatus 100, and the received signal is a physical (PHY) layer 214 and a media access control (MAC) layer ( It may be input to the signal processor 211 via 214.

For example, the signal processor 111 may include a frame buffer (not shown), and store the input image signal in the frame buffer and output the image signal according to a preset format. application).

The control unit 212 controls the overall operation of the receiving device 200, for example, the image signal received through the RF receiving unit 220, the physical (PHY) layer 214 and the media access control (MAC) layer 213 ), And then converted into a displayable form by the application.

According to an embodiment of the present invention, the control unit 212 measures the reception sensitivity of the signal received from the transmitting device 100, for example, the packet error rate (PER) or the received signal strength (RSSI), and receives the measured signal. If the sensitivity is below the reference value, the intermediate frequency IF can be changed.

Referring to FIG. 6, the RF receiver 120 may include a plurality of mixers and amplifiers, and the signal received from the transmission apparatus 100 may be used to convert the signal received from the intermediate frequencies IF1 and IF2. Can be converted into a signal.

In addition, the signals of the intermediate frequencies IF1 and IF2 may be output as IQ data after being amplified and demodulated and transmitted to the base band unit 210.

On the other hand, when the receiving device 200 receives a signal from a plurality of transmitting devices, each signal is converted into a signal of the intermediate frequencies IF1, IF2 and then the base band unit 210, more specifically media access Signals input to the control (MAC) layer 213 and input on the same intermediate frequencies IF1 and IF2 may cause interference in the media access control (MAC) layer 213.

Accordingly, by changing the intermediate frequency (IF), the controller 112 can reduce the occurrence of channel interference in the media access control (MAC) layer 113 of the base band unit 110.

Referring to FIG. 7, the RF receiver 220 may further include converters 300 and 310 for signal conversion according to the changed intermediate frequencies IF3 and IF4, and the converters 300 and 310. Each may include a plurality of mixers and amplifiers for the intermediate frequencies IF3 and IF4.

Hereinafter, a signal reception method according to an embodiment of the present invention will be described in detail with reference to FIG. 8.

8 is a flowchart illustrating a signal receiving method according to an exemplary embodiment of the present invention, and the signal receiving method shown in FIG. 8 will be described with reference to the receiving apparatus 200 shown in FIG. 5.

Referring to FIG. 8, the RF receiver 210 of the receiver 200 receives a signal from the transmitter 100 (operation 400). In step 400, the RF receiver 210 may receive a signal from a plurality of transmitters 100, 110, and 120.

The baseband unit 210 of the receiver 200, more specifically, the controller 212 measures the signal reception sensitivity of the signal from the transmitter 100 (step 410).

The controller 212 may measure a packet error rate (PER) or a received signal strength (RSSI) of the signal received from the transmitting device 100.

Thereafter, the controller 212 compares the measured signal reception sensitivity with a preset reference value and checks whether the signal reception sensitivity is less than or equal to the reference value (step 420).

As a result of the comparison, when the signal reception sensitivity is less than or equal to the reference value, the controller 212 may determine the influence of the channel interference. Accordingly, the controller 212 changes the intermediate frequency IF (step 430).

For example, the controller 212 may change from (IF1, IF2) to (IF3, IF4), and the intermediate frequency signal converted into the changed intermediate frequency (IF3, IF4) by the RF receiver 220 is a base. The band unit 210 may be input and processed.

FIG. 9 is a block diagram illustrating another embodiment of a configuration of a signal transmission and reception system, and descriptions of the same elements as those described with reference to FIGS. 1 to 8 during the operation of the transmission and reception system shown in FIG. 9 will be omitted. do.

Referring to FIG. 9, the display apparatus 500 according to the exemplary embodiment of the present invention may include the receiving apparatus 200 and the display module 510 as described above.

That is, the transmitting apparatus 100 receives a media signal from the outside and wirelessly transmits the media signal to the receiving apparatus 200, and the receiving apparatus 200 provided in the display apparatus 500 displays the wirelessly transmitted data. The signal may be processed and output to the display module 510.

The display module 510 may display an image using an image signal input from the receiving device 200, and for this, a liquid crystal display (LCD), a plasma display panel (PDP), an electro luminescent display (ELD), and a VFD Various display methods such as a (Vacuum Fluorescent Display) may include a display panel (not shown).

In addition, the above-described signal receiving method according to the present invention may be stored in a computer-readable recording medium that is produced as a program for execution on a computer, and examples of the computer-readable recording medium include ROM, RAM, CD- ROMs, magnetic tapes, floppy disks, optical data storage, and the like, and also include those implemented in the form of carrier waves (eg, transmission over the Internet).

The computer readable recording medium can be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion. In addition, functional programs, codes, and code segments for implementing the broadcast reception method may be easily inferred by programmers in the art to which the present invention belongs.

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, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention.

1 to 3 are block diagrams illustrating an exemplary embodiment of a signal transmission / reception system.

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

5 is a block diagram showing the configuration of a receiving apparatus according to an embodiment of the present invention.

6 and 7 are views illustrating an embodiment of the configuration of the RF transceiver.

8 is a flowchart illustrating a signal reception method according to an embodiment of the present invention.

9 is a block diagram showing another embodiment of the configuration of the signal transmission and reception system.

Claims

In the method for receiving a media signal from a transmitting device connected to a wireless network,

Measuring signal reception sensitivity; And

And changing an intermediate frequency (IF) when the measured signal reception sensitivity is less than or equal to a reference value.

The method of claim 1, wherein the measuring step

Signal receiving method for measuring the packet error rate (PER, Packet Error Rate) of the signal received from the transmitting device.

The method of claim 1, wherein the measuring step

Signal receiving method for measuring the received signal strength (RSSI, Received Signal Strength Indicator) of the signal received from the transmitting device.

The method of claim 1,

Receiving a signal from the transmitting device;

Converting the received signal into a signal of the changed intermediate frequency; And

And receiving the converted intermediate frequency signal into a media access control (MAC) layer.

5. The method of claim 4,

And the media access control (MAC) layer receives signals having different intermediate frequencies.

The method of claim 5,

The signal receiving method having the different intermediate frequencies are respectively received from a plurality of transmitting devices.

The method of claim 4, wherein the receiving step

Signal receiving method for receiving a signal from the transmitting device using at least one of the wireless communication method of WiHD, WHDi and WiFi.

A method for transmitting a media signal to a receiving device connected over a wireless network, the method comprising:

Measuring signal reception sensitivity;

Changing an intermediate frequency (IF) when the measured signal reception sensitivity is less than or equal to a reference value;

And converting a signal to be transmitted to the receiving device into a signal of the changed intermediate frequency.

An apparatus for receiving a media signal from a transmitter connected via a wireless network, the apparatus comprising:

An RF receiver for converting a signal received from the transmitter into a signal having an intermediate frequency IF and outputting the signal; And

It includes a base band (base band) for processing the signal of the intermediate frequency output from the RF receiver,

The intermediate frequency is variable according to the signal reception sensitivity.

The method of claim 9, wherein the base band portion

A media access control (MAC) layer; And

And a control unit which changes the intermediate frequency when the signal reception sensitivity is less than or equal to a reference value.

The method of claim 10,

The media access control (MAC) layer receives a signal having a different intermediate frequency.

The method of claim 11,

And receiving signals having different intermediate frequencies from each of a plurality of transmitting devices.

The display apparatus provided with the receiving apparatus as described in any one of Claims 9-12.

A computer-readable recording medium having recorded thereon a program for executing the method according to any one of claims 1 to 8.