KR20030074770A - Local area network system using master antenna television network - Google Patents

Abstract

PURPOSE: A LAN(Local Area Network) system using an MATV(Master Antenna TV) network is provided to offer an Internet service and a LAN additional service through the MATV network wired in a complex building. CONSTITUTION: A user terminal modem unit(190) is composed between a user terminal(170) and an MATV network(180), for forming a signal input/output interface. A dedicated line modem unit(210) forms an interface for inputting and outputting a signal between an Internet dedicated line(200) and the MATV network(180), and controls the input and output of an Internet upward signal, a LAN upward signal, an Internet downward signal, and a LAN downward signal. When providing a LAN additional service, the dedicated line modem unit(210) controls the user terminal modem unit(190). A signal noise processing unit(220) has an HPF(High Pass Filter) for removing a noise component inserted into the Internet downward signal and the LAN downward signal, and a BPF(Band Pass Filter) for removing a noise component inserted into the Internet upward signal and the LAN upward signal. The signal noise processing unit(220) has an amplifier for amplifying the levels of the Internet upward signal and the LAN upward signal, for recovering the levels of the Internet upward signal and the LAN upward signal, which are attenuated through the BPF, as original signal levels.

Description

Local area communication system using MATV {LOCAL AREA NETWORK SYSTEM USING MASTER ANTENNA TELEVISION NETWORK}

In general, the composite building forms a Master Antenna Television Network (MATV Network) so that multiple channels of programs can be viewed in multiple households. Here, the public announcement network (MATV) refers to a single signal receiving system that connects various TV receivers in the same building or a dense area of a building, and establishes a main antenna and distributes TV signals to a plurality of TV receivers therein. A cable network that allows you to watch television.

In particular, apartments with a large number of households often associate the disclosure network with local cable TV companies in order to satisfy the needs of a plurality of TV receiving homes. In general, local cable TV companies use fiber optic cables to transmit TV signals from cable headends to nodes close to end users, and coaxial cable from the nodes to set-top boxes for individual users. To transmit the TV signal. As described above, in the transmission of a TV signal composed of video and audio data to a user, a technology that allows a mixture of optical fiber cables and coaxial cables in different parts of a network is referred to as HFC communication technology.

In the above-described HFC communication technology, there is an advantage that the excellent signal transmission characteristics of the optical fiber cable can be delivered close to the user without replacing the existing coaxial cable which is always installed in the enterprise or home. In addition, in the HFC technology, since the optical fiber cable is used as the backbone pipe, more data can be transmitted at a higher bandwidth than when only the coaxial cable is used, thereby providing a two-way data transmission service based on a server / client model. The infrastructure portion where the fiber optic cable is installed can be more reliable than coaxial cable, making it more efficient to interconnect networks of geographically adjacent cable TV or telephone companies. Therefore, many cable TV companies and telephone companies are upgrading their existing network to HFC network.

On the other hand, recently, the technology for providing high-speed Internet service using HFC network, which is the cable network based network network, has been commercialized. In implementing such a high-speed Internet service, the process of transmitting the Internet uplink signal and downlink signal through the HFC network will be described in more detail with reference to FIG.

First, the Internet data packet transmitted through the Internet network 10 passes through a router 20, and the Internet data packet transmitted through the router 20 passes through a cable modem termination system (CMTS) 30. Is converted into data in a receivable form. The converted Internet data is combined with the cable TV signal transmitted from the CATV transmitting station 60 in the combiner 50 and transmitted to the optical network 80 through the optical transmitter 70, and the transmitted composite signal is transmitted to the optical network terminal. Via the device 90 and the coaxial cable network 100, it is transmitted via the brancher 110 to the building where the Internet service is to be provided.

The composite signal branched at the branch switch 110 is separated into an internet signal and a cable TV signal at the signal separator 120, and transmitted through separate cable lines. Among the separated signals, the Internet signal is used by the user through the cable modem 40. The signal is converted into a signal recognizable by the terminal 130 and input to the user terminal 130, and the cable TV signal is input to the TV receiver 150 through the converter 140.

On the other hand, the Internet uplink signal transmitted from the user terminal 130 is first input to the optical network termination device 90 through the coaxial cable network 100 via the cable modem 40 is converted into an optical signal and then the optical network 80 Is sent to. Then, the Internet uplink signal is input to the CMTS 30 through the optical receiver 160, converted into an Internet data packet, and then transmitted to the Internet network 10 via the router 20.

However, when the above-described Internet up / down signal transmission model using the HFC network is applied to a public listening network (MATV) constructed in a complex building such as an apartment, various unnecessary noises flowing into the Internet uplink signal transmitted through the public listening network Due to this, there is a problem that reliable transmission of Internet data is impossible. Therefore, in the case of a complex building, Internet service is not provided through the public announcement network, and ADSL; Home LAN; Internet service is provided by a method such as an outer wall wiring cable modem.

However, there are a number of deficiencies in such approaches currently being tried. For example, the installation weight is increased to build a new network, and the complexity of the installation work that requires finding a signal line to each home in a large apartment complex and adding additional equipment as the number of subscribers increases The difficulty is that in the case of apartments, the headends are located in the basement of the complex. Since the space is limited, spatial constraints continue to occupy the headend installation space as the number of Internet service subscribers increases, and the noise introduced by the Internet upward signal. Has a lot of effects on Internet communication but cannot be effectively removed.

The present invention is a short-range communication that simultaneously provides an Internet service and a LAN (Local Area Network) service using a public listening network wired at the time of construction of an apartment, a mall, a building, a school, a hotel, an inn, and the like (hereinafter referred to as a complex). It is about the system.

1 is a network diagram illustrating a method of providing an Internet service using a conventional hybrid fiber coaxial (HFC) network.

2 is a block diagram of a short-range communication system using a public hearing network according to an embodiment of the present invention.

3 is a block diagram of a signal noise processor provided in a short-range communication system using a public hearing network according to an embodiment of the present invention.

4 is a block diagram of a level adjustment unit of a signal noise processor of the short range communication system according to the present invention.

Therefore, the technical problem to be achieved by the present invention is to implement the Internet service using the public hearing network wired to the complex building without a separate installation for the provision of the Internet service, as well as local area communication that can provide additional LAN services To provide a system.

The short-range communication system using a public listening network for achieving the above technical problem is a system for enabling simultaneous use of an Internet service and a LAN supplementary service on a plurality of user terminals connected to a public listening network connected to a complex building. a) a user terminal modem unit provided between the user terminal and the public listening network to form a signal input / output interface; (b) establishes an interface for signal input / output between the dedicated Internet line and the public hearing network to control input / output of the Internet uplink signal and downlink signal and LAN uplink signal and downlink signal, and provides a user terminal modem when providing a LAN supplementary service; A dedicated line modem unit in charge of controlling the unit; And (c) a high pass filter for removing noise components introduced into the downward signal, a band pass filter for removing noise components introduced into the upstream signal, and a rear pass of the band pass filter through the band pass filter. And a signal noise processing unit including an amplifier for amplifying the level of the filtered up signal to restore the attenuated uplink signal level to the original signal level, wherein the signal noise processing unit is between the user terminal modem unit and the public listening network and the dedicated line modem. It is characterized in that it is provided on at least one of the department and the public hearing request network.

In the present invention, the user terminal modem unit comprises: a signal demodulator for demodulating and outputting the Internet downlink signal and the LAN downlink signal; A signal modulator for modulating and outputting an internet uplink signal and a LAN uplink signal; And a terminal modem control unit controlling the signal modulation / demodulation unit process and controlling signal input / output with the dedicated line modem unit to enable internet service and LAN additional service.

In an embodiment of the present invention, the dedicated line modem unit may include: a signal modulator for modulating and outputting an Internet downlink signal and a LAN downlink signal; A signal demodulator for demodulating and outputting an Internet uplink signal and a LAN image uplink signal; And a dedicated line modem control unit for controlling the signal modulation / demodulation unit process and controlling signal input / output with the user terminal modem unit to enable internet service and LAN additional service.

In the present invention, the signal noise processing unit preferably includes a plurality of band pass filters and amplifiers.

In the present invention, it is preferable that the signal noise processing unit further comprises a mixer for mixing and modulating the intermediate frequency and the uplink signal generated from the oscillator in front of the bandpass filter to filter the uplink signal at an intermediate frequency. .

In the present invention, the signal noise processing unit, the bi-directional band separator for separating the up and down signals to separate and filter the noise components added to the up and down signals for each signal, the high pass filter and the band It is preferable to further provide at the front end of the pass filter.

In the present invention, it is preferable that the signal noise processing unit further includes a level adjusting unit connected to a rear end of the amplifier to convert the level of the upstream signal into a predetermined reference level. In this case, the level adjusting unit may include: a level measuring unit measuring a signal level of an upstream signal introduced into the level adjusting unit and comparing the measured level with a predetermined reference level; And a level converter configured to adjust the signal level of the uplink signal to a predetermined reference level.

Hereinafter, the present invention will be described in detail with reference to examples, and detailed description will be made with reference to the accompanying drawings to help understand the present invention. However, embodiments according to the present invention can be modified in many different forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. Embodiments of the present invention are provided to more clearly and easily describe the present invention to those skilled in the art. Like reference numerals in the drawings refer to like elements.

2 is a block diagram of a short-range communication system according to an embodiment of the present invention.

Referring to FIG. 2, a short-range communication system using a public hearing network according to the present invention is a system for simultaneously using an Internet service and a LAN supplementary service on a plurality of user terminals 170 connected to a public hearing network connected to a complex building. In connection with, the user terminal modem unit 190 is provided between the user terminal 170 and the public hearing network 180 to form a signal input / output interface; An interface for signal input / output is formed between the Internet leased line 200 and the public announcement network 180 to control input / output of the Internet uplink signal and the LAN downlink signal and the Internet downlink signal and the LAN downlink signal, A dedicated line modem unit 210 in charge of controlling the user terminal modem unit 190 at the time of provision; A high pass filter for removing noise components introduced into the Internet downlink signal and the LAN downlink signal, a bandpass filter for removing noise components introduced into the Internet uplink signal and the LAN downlink signal, and a rear end of the bandpass filter And a signal noise processor 220 including an amplifier for amplifying the level of the filtered upstream signal to restore the upstream signal level attenuated by the bandpass filter to the original signal level. Here, the LAN phase downlink signal refers to all signals except for the Internet downlink signal from the signal transmitted from the leased line modem unit 210 to the public announcement network 180, and the LAN phase uplink signal refers to a dedicated line in the public announcement network 180. The signals transmitted to the modem unit 210 refer to all signals except the Internet uplink signal. Hereinafter, unless there is no particular limitation, the uplink signal refers to the Internet uplink signal and the LAN uplink signal, and the downlink signal refers to the Internet downlink signal and the LAN downlink signal.

The signal noise processing unit 220 is preferably provided in at least one of between the user terminal modem unit 190 and the public hearing network 180, and between the dedicated line modem unit 210 and the public hearing network 180, a more specific configuration And operating aspects will be described later with reference to the drawings.

A short range communication system according to the present invention, comprising: a web service; Mail service; The Internet downlink signal from the remote server 230 providing the FTP service to the user terminal 170 is input through the Internet leased line 200 and transmitted to the user terminal 170 of each service requester via the public announcement network 180. The upstream signal from the user terminal 170 to the remote server 230 is transmitted to the remote server 230 through the Internet listening line 180 through the public listening network 180.

In the short-range communication system according to the present invention, the leased line modem unit 210 includes a leased line control unit 210a and signal modulation / demodulation units 210b and 210c to print up / down signals through the Internet leased line 200. On / off and on / off control; Modulation of the Internet downlink signal transmitted from the remote server 230 to the public listening network 180; Demodulation of the Internet uplink signal to be transmitted from the public announcement network 180 to the remote server 230; Demodulation of the upstream signal of the LAN; Modulation of the LAN downlink signal; Signal traffic control; TCP / IP management; Functions as a conventional LAN construction dedicated line modem such as control of the terminal modem unit 190 connected to the user terminal 170 on the LAN constructed based on the public announcement network 180 and address management of the user terminal 170. .

In the short-range communication system according to the present invention, the user terminal modem unit 190 includes a terminal control unit 190a and signal modulation / demodulation units 190b and 190c, thereby providing interface signals, Internet uplink signals, and LAN images for users. Modulate the uplink signal, the response signal for the control of the dedicated line modem unit 210, the self-diagnosis signal, and the like to transmit to the dedicated line modem unit 210, and control the user terminal modem unit 190 transmitted from the dedicated line modem unit 210 Demodulate signal, internet downlink signal, LAN downlink signal, and the like. In this case, the terminal controller 190a controls the signals demodulated by the modulation / demodulation units 190b and 190c and provides an interface to the user. On the other hand, the LAN card 240 is provided between the user terminal 170 and the terminal modem unit 190, the LAN card 240 is a protocol between the LAN and the user terminal 170 constructed using the public hearing network 180 And the interface for the user to the terminal 170.

In the short-range communication system according to the present invention, the signal noise processor 220 removes noise components introduced into the uplink signal and the downlink signal. Hereinafter, the signal noise processor 220 described above will be described with reference to FIGS. 2 and 3. More specifically, the signal noise processing unit 220 provided between the dedicated line modem unit 210 and the public hearing network 180 will be described mainly. The configuration and operation of the signal noise processing unit 220 provided between the user terminal modem unit 190 and the public hearing network 180 can be clearly and easily understood from the following description. Natural to those who have knowledge of

3 is a block diagram illustrating a configuration of a signal noise processor 220 provided between the dedicated line modem unit 210 and the public hearing network 180 in the short range communication system according to the present invention.

Referring to FIG. 3, the signal noise processor 220 includes a high pass filter 250 for removing noise components introduced into the downlink signal and the downlink signal of the Internet, which are modulated by the dedicated line modem unit 210; A band pass filter 260 for removing noise components introduced into the Internet uplink signal and the LAN image uplink signal transmitted from the user terminal 170 through the public announcement network 180; A bidirectional band separator (Diplex) provided at the front of the high pass filter 250 and the band pass filter 260 to separate and filter the noise components introduced into the uplink signal and the downlink signal for each signal. Filter: 270; In order to filter an uplink signal at an intermediate frequency (IF), a first mixer (Mixer) that mixes and modulates an intermediate signal and an uplink signal generated from a local oscillator 280 in front of the bandpass filter 260. 290a); An amplifier 300 which modulates the attenuated signal level by being modulated at an intermediate frequency by the first mixer 290a to a signal level before being modulated; A second mixer (Mixer) 290b for demodulating the uplink signal to the original frequency band by mixing the uplink signal from which the noise component is removed by the bandpass filter 260 with the intermediate frequency provided from the oscillator 280; An amplifier 310 connected to a rear end of the band pass filter 260 to amplify the level of the filtered upstream signal to restore the attenuated upstream signal level to the original signal level; And a level adjusting unit 320 for converting the level of the upstream signal output from the amplifier 310 to a predetermined reference level. The signal noise processing unit 220 according to the present invention preferably includes a plurality of signal level compensation amplifiers and band pass filters at the rear end of the band pass filter 260 shown in FIG. The noise component can be removed more effectively. The downlink signal is filtered by the signal noise processor 220 in a predetermined frequency band, for example, 55-750 MHz band, and the uplink signal is filtered and amplified several times in a predetermined frequency band, for example, 5-42 MHz band. Is removed.

Hereinafter, an operation aspect of the signal noise processing unit 220 having the above-described configuration will be described in more detail.

Since the up / down signals transmitted / received on the public listening network 180 are divided into different frequency domains and transmitted through one coaxial cable, a bidirectional band separator 270 is first used to remove noise for each of the uplink signal and the downlink signal. ), The upstream signal and the downlink signal are separated from each other.

The separated down signal is filtered by the high pass filter 250 to remove noise components other than the down signal. The downlink signal from which the noise component is removed is transmitted to the user terminal 170 through the public hearing network 180. On the other hand, when the signal is introduced into the public hearing network 180 composed of coaxial cables, the signal to noise ratio (S / N ratio) is significantly lowered because the noise signal generated by various electrical equipment and electromagnetic wave generation equipment is introduced. Since the loss rate increases rapidly, reliable signal transmission through the public hearing network 180 is not possible. Due to this problem, the uplink signal is filtered by the band pass filter 260 after the signal is separated by the bidirectional band separator 270 to remove the noise component.

The noise component removal process of the uplink signal will be described in more detail. The uplink signal separated by the bidirectional band separator 270 is mixed with the intermediate frequency component provided from the oscillator 280 in the first mixer 290a. Is modulated into the intermediate frequency band. The reason for filtering the noise signal by modulating the uplink signal into the intermediate frequency band is to make filtering easier and more accurate.

The uplink signal whose signal level is attenuated while being modulated at an intermediate frequency is restored to the signal level before the signal is amplified by the amplifier 300 and modulated, and the noise component is filtered through the band pass filter 260. In this case, it is preferable that the band pass filter 260 uses a SAW filter capable of realizing high quality pass characteristics and perfect blocking of unnecessary band signals.

The uplink signal from which the noise is removed by the bandpass filter 260 is mixed with the intermediate frequency component provided from the oscillator 280 in the second mixer 290b to demodulate the frequency into the original frequency band. Noise is removed through the amplifier 300 and the bandpass filter 260, and the uplink signal, which is recorded in the original frequency band, is once received by the amplifier 310 to restore the signal level attenuation by the second mixer 290b. It is further amplified and transmitted to the public hearing network 180 through the level adjuster 320 and the bidirectional band separator 270.

In the signal noise processing unit 220 according to the present invention, the first and second mixers 290a and 290b minimize noise of the oscillator 280, and RF (Intermediate Frequency) / LO (Local) It is preferable to use a DBM (Double Balanced Mixer) having excellent isolation characteristics between Oscillators).

In addition, although not shown in FIG. 3, the signal noise processor 220 according to the present invention may further include one or more amplifier / bandpass filter pairs at the output terminal of the bandpass filter 260. In this case, by maintaining a higher signal-to-noise ratio (S / N ratio) in filtering for noise removal of the uplink signal, it is possible to more reliably remove the noise signal introduced into the uplink signal.

Meanwhile, the level adjuster 320 provides an uplink frequency band conversion function to cope with various Internet uplink signal bands adopted by a plurality of Internet Service Providers (ISPs) when providing an Internet service through an HFC network. do.

4 is a block diagram showing the configuration of the level adjuster 320 included in the signal noise processor 220 according to the present invention.

4, the level adjusting unit 320, the limiter 330 for blocking the signal input of a predetermined level or more; A detector 340 which receives the signal output through the limiter 330 and generates a meta current signal representing the strength of the uplink signal; A converter (350) consisting of a resistor and an electrolytic capacitor for converting the metacurrent signal into a voltage signal at an output of the detector 340; An analog to digital converter (360) for receiving an analog voltage signal and converting the signal to a digital uplink signal level; A microcomputer 370 which compares a preset uplink signal level value with a digital uplink signal level and generates a level control signal if the values do not coincide with each other within an allowable error range; And a level converter 380 which receives the level control signal generated from the microcomputer 370 and adjusts the level of the filtered upstream signal to the reference signal level and outputs it to the bidirectional band separator 270.

When the level adjustment unit 320 having the above-described configuration is provided in the signal noise processing unit 220, an Internet uplink frequency band adopted by an ISP operating an Internet network in providing an Internet service using a short range communication system according to the present invention. It is possible to tune the uplink signal band.

In the above described with reference to the accompanying drawings, preferred embodiments of the present invention in detail. However, embodiments of the present invention may be variously modified or applied by those skilled in the art, the scope of the technical idea according to the present invention should be determined by the claims below. will be.

According to an aspect of the present invention, it is possible to provide an Internet service and a LAN additional service through the public hearing network wired to the complex building.

According to another aspect of the present invention, since the public hearing network wired to the complex is used as a short-range communication network, so that no social / economic costs are incurred for the network construction. Can be provided.

According to another aspect of the present invention, since the LAN additional service can be provided to the apartment, which has been difficult to establish a short-range communication network, not only can the apartment residents be united, but also the apartment management system can be digitized.

Claims (8)

The present invention relates to a system for simultaneously using an Internet service and a LAN supplementary service on a plurality of user terminals connected to a public hearing network wired to a complex building. (a) a user terminal modem unit provided between the user terminal and the public hearing network to form a signal input / output interface; (b) Form an interface for signal input / output between the dedicated Internet line and the public announcement network to control the input / output of the Internet uplink signal and the LAN uplink signal and the Internet downlink signal and the LAN downlink signal, and to provide users with additional LAN services. A dedicated line modem unit in charge of controlling the terminal modem unit; And (c) a high pass filter for removing noise components introduced into the downlink signal, a bandpass filter for removing noise components introduced into the uplink signal, and attenuated through the bandpass filter connected to a rear end of the bandpass filter And a signal noise processing unit including an amplifier for amplifying the level of the filtered upstream signal to restore the level of the upstream signal to the original signal level, wherein the signal noise processing unit is between the user terminal modem unit and the public hearing network. A local area communication system using a public hearing network, characterized in that provided in at least one of the modem unit and the public hearing network. The method of claim 1, wherein the user terminal modem unit, A signal demodulator for demodulating and outputting a downlink signal; A signal modulator for modulating and outputting an uplink signal; And Local area communication using the public hearing network, characterized in that it comprises a terminal modem control unit for controlling the process of the signal modulation / demodulation unit, and the control of signal input / output to the dedicated line modem unit to enable the Internet service and LAN additional service. system. The method of claim 1, wherein the dedicated line modem unit, A signal demodulator for demodulating and outputting an upstream signal; A signal modulator for modulating and outputting a downlink signal; And A short-range communication system using a public listening network, comprising: a dedicated line modem control unit controlling a signal modulation / demodulation unit process and controlling a signal input / output with a user terminal modem unit to enable an Internet service and a LAN additional service. . The method of claim 1, wherein the signal noise processing unit, A near field communication system using a public listening network, characterized in that the band pass filter and a plurality of amplifiers are provided. The method of claim 1, wherein the signal noise processing unit, And a mixer configured to mix and modulate an intermediate frequency and an uplink signal generated from an oscillator in front of the band pass filter to filter the uplink signal at an intermediate frequency. The method of claim 1, wherein the signal noise processing unit, In order to filter the noise components added to the uplink signal and the downlink signal for each signal, a bidirectional band separator for separating the uplink signal and the downlink signal is further provided in front of the high pass filter and the band pass filter. Short-range communication system using a public hearing network. The method of claim 1, wherein the signal noise processing unit, And a level adjusting unit connected to a rear end of the amplifier and converting the level of the uplink signal to a predetermined reference level. The method of claim 7, wherein the level adjusting unit, A level measuring unit measuring a signal level of an upstream signal introduced into the level adjusting unit and comparing the measured level with a predetermined reference level; And And a level converter configured to adjust the signal level of the uplink signal to a predetermined reference level.