KR200325542Y1 - Subscriber connecting device of wide CDM wireless subscriber network where RF terminal is separated from main body - Google Patents

Abstract

The present invention relates to a subscriber access unit (RIU) of a wireless subscriber network in a wide CD where the RF stage is separated from the main body. In the related art, the field strength of the RF is due to the combination of the RF stage, the IF and the base band stage. It is much weaker, especially when installed in a blind spot indoors, there is a problem that can cause a big obstacle in connection with the wireless base station.

Therefore, the present invention provides an IF and base for processing intermediate frequencies and basebands for radio communication with the radio base station via a cable using an RF terminal for processing radio frequency (RF) for radio communication with a radio base station. Separating from the band end is characterized in that it can be installed outdoors.

Accordingly, when the RIU main body is installed indoors, it can be installed in a desired place without being affected by the radio interference area, and the RF unit can be installed outside than the main body. To provide services.

Description

Subscriber access device of wide CDA wireless subscriber network with RF terminal installed separately from main unit

The present invention relates to a Radio Interface Unit (RIU) of a Wide-CDMA Wireless Local Loop. Specifically, the RF stage is used as a block in installing a subscriber access device. RF stage that separates IF and baseband stage into one block to install RF stage in real time or near place, and connects IF signal with low frequency to baseband installed indoors to reduce signal loss. The present invention relates to a subscriber access device of a wireless wide area network (CDMA) which is installed separately from a wide CD.

1 is a block diagram of a general wireless subscriber network (WLL) system to which the present invention is applied.

As shown, a wireless subscriber network (WLL) system is a system that replaces a fixed period of time between each subscriber's home and a public circuit switch by wire instead of wires in a conventional public circuit switched network (PSTN) system. Subscriber access unit (RIU) to receive and transmit to the base station (10), a radio base station (RP: Radio Port) (20) responsible for connecting and disconnecting the bearer (bearer) wirelessly with the access device, and the wireless base station A radio base station controller (RPC) 30 for controlling 20, and a wireless subscriber line network switch 40 that is responsible for link establishment of a call with an existing public circuit switched network (PSTN). Wireless subscriber networks are cheap to install per line, can be quickly installed and serviced, can provide Toll Quality voice services and high-speed data services (ISDN), and are easy to operate and maintain.

2 shows a general subscriber access device to which the present invention is applied.

The subscriber access device receives the baseband CDMA signal largely, the RF processor 11 for transmitting and receiving wirelessly with the base station, and the modulation and demodulation, interleaving / deinterleaving, encoding and demodulation of the IQ signal for controlling and managing the subscriber access device. A digital processing unit 12 for providing a and signal path, a line interface processing unit 13 for interfacing voice, fax, and modem signals to a subscriber via an analog path, and a power supply for a subscriber connection device when the commercial power supply is cut off. It is composed of a power supply unit 14 for supplying the.

The RF processor 11 converts a CDMA signal of an RF band received from an antenna into a baseband, and converts a baseband CDMA signal into an RF band to transmit and receive with the wireless base station 20.

The digital processing unit 12 performs a CDMA modulation / demodulation function, a channel sub-decoding / decoding function, an interleaving / deinterleaving function, a power control function, an incoming / outgoing call processing function, an authentication and encryption function, and an operation and maintenance function of a subscriber access device. .

The line interface processor 13 transmits voice, fax, and modem signals to subscribers through an analog path, and provides ring supply, ring interruption, call current supply, and tone.

The power supply unit 14 receives the AC commercial power and creates a DC voltage using the AC / DC converter, and is divided into a battery for supplying power to the subscriber access device when the commercial power is cut off.

3 shows an RF processing unit of a typical subscriber access apparatus.

As shown, the RF processing unit 11 of the subscriber access device is largely based on an RF stage 11a for processing a radio frequency (RF) to perform radio communication with a wireless base station and the base through the intermedeate frequency modulation. IF and baseband stage 11a for band processing.

The RF terminal 11a is preferably outdoor rather than indoor for smooth wireless communication with the wireless base station. This is because the RF frequency is sensitive to the influence of the electric field.

However, in the conventional subscriber access apparatus, the RF processor and the baseband processor are configured together, and are generally installed indoors because they are connected to the subscriber terminal through a communication port or a LAN port. Therefore, the field strength of the RF stage is much weaker indoors, and especially when installed in a blind spot indoors, there is a problem that can cause serious obstacles in connection with the wireless base station.

The present invention has been made to solve the above problems, in configuring the subscriber access device of the wireless subscriber network by configuring the RF stage separately from the IF and baseband stage to be installed outdoors, the field strength of the RF processing unit is weakened It is an object of the present invention to provide a subscriber access device of a CDA wireless subscriber network in which the RF stage is installed to be separated from the main body to prevent the radio terminal from improving the efficiency of wireless communication.

The present invention for achieving the above object is in a subscriber access device of a wide wireless subscriber network, a duplex for transmitting and receiving a radio signal of a wireless base station transmitted and received through the wireless subscriber network, and amplifies a signal transmitted and received with the duplex A transmission / reception amplifier, a transmission / reception mixer for mixing the transmission / reception data signals amplified by the transmission / reception amplifier, a transmission / reception filter for filtering the transmission / reception data signals mixed by the transmission / reception mixer, and a reception signal and transmission signal output from the transmission / reception filter. An RF stage installed outdoors including a mux / demux unit for multiplexing / demultiplexing;

A mux / demux unit for multiplexing / demultiplexing IF data signals transmitted / received from the mux / demux unit of the RF stage, an AGC amplifier for amplifying data transmitted / received through the mux / demux unit, and the AGC amplifier. A transceiving mixer for mixing the transceiving data amplified by the transceiving data, a transceiving filter for filtering the transceiving data mixed by the transceiving mixer, and A for converting the analog data filtered by the transceiving filter into digital data or digital data into analog data. A modem for modulating or demodulating transmit / receive data digitally converted by the A / D and D / A converters, and a transmit / receive signal between the modem and the subscriber device; IF and baseband stages installed indoors, including the CPU controlling the modem and the user interface. Provides a subscriber access device of a wide CD radio wireless subscriber network is installed separately from the main RF stage.

1 is a configuration diagram of a general WLL system network,

2 is a schematic block diagram of a subscriber access apparatus of a general WLL;

3 is a schematic internal transport block diagram of a conventional RF processor;

Figure 4 is a block diagram of a wireless subscriber station RF terminal is separated from the IF and baseband stage according to an embodiment of the present invention.

<Detailed Description of Codes>

100: RF stage 101: duplexer

102: receiving amplifier 103: receiving mixer

104: reception filter 105: voltage controlled oscillator (VCXO)

106: PLL107: ROM

108: transmission filter 109: transmission mixer

110: transmission amplifier 111: mux / demux unit

112: power supply unit 200: IF and baseband stage

201: mux / demux unit 202: receiving AGC amplifier

203: Receive mixer 204: Receive filter

205: A / D converter 206: modem

207: user interface 208: CPU

209: D / A converter 210: transmission filter

211 transmission mixer 212 transmission AGC amplifier

213: voltage controlled oscillator (VCXO) 214: PLL

215: REF 216: VCO

217: power supply

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a W-CDMA WLL subscriber access device according to the present invention.

As shown in the figure, the RF terminal 100 that processes RF for wireless communication with a wireless base station including an antenna is installed outside the mux / demux unit and a separate power supply unit for wireless communication with the wireless base station. IF and baseband stage 200 for intermediate frequency processing and baseband processing is installed in the main body is configured indoors.

The RF stage 100 installed outdoors mixes a duplex 101 for transmitting and receiving a radio signal of a wireless base station through an antenna, a receiving amplifier 102 for amplifying a received signal, and an amplified received data signal. A reception mixer 103, a reception filter 104 for filtering the mixed reception data signal, a transmission filter 108 for filtering the data to be transmitted from the mux / demux unit 101, and the filtered transmission. A transmission mixer 109 for mixing data signals, a transmission amplifier 110 for amplifying a data signal to be transmitted, and a voltage controlled oscillator (VCXO) for controlling the transmission / reception mixers 103 and 109 by applying a PLL at a fixed frequency. 105, the PLL 106, the ROM 107, and a mux / demux section 111 for multiplexing or demultiplexing a data signal to be transmitted and received are provided with a power supply section 112 separate from the PLL 106 and the ROM 107. Here, the voltage controlled oscillator (VCXO) 105, the PLL 106, and the ROM 107 are constituted by a conventional PLL portion (not shown).

The IF and baseband stage 200 according to the present invention installed indoors has mux / demux unit 201 for multiplexing / demultiplexing IF signals and data received through the mux / demux unit 201. AGC amplifier 202 for amplifying the signal, a reception mixer 203 for mixing amplified received data, a reception filter 204 for filtering the mixed received data, and A / for converting the filtered analog data into data. A D converter 205, a modem 206 and a user interface 207 for transmitting digitally converted received data to a subscriber, a CPU 208 for controlling the modem 206 and a user interface 207, CPU 208 for converting the subscriber's digital signal into an analog signal through the modem 206, D / A converter 209 for converting the subscriber's digital signal into an analog signal through the modem 206, and analog To filter the converted outgoing data A transmission filter 210, a transmission mixer 211 mixing the filtered transmission data, a transmission AGC amplifier 212 for amplifying the data signal to be transmitted, and a PLL at a fixed frequency, and the transmission and reception mixers 203 and 211. A voltage controlled oscillator (VCXO) 213, a PLL 214, a REF 2158 providing a reference clock to the PLL 214, a VCO 216 for redundancy, and a separate power supply unit. 217. Here, the voltage controlled oscillator (VCXO) 213, the PLL 214, the REF 2158 for providing a reference clock to the PLL 214, and the VCO 216 for redundancy are conventional PLL units ( Not shown).

As described above, the RF stage 100 installed outdoors and the IF and baseband stage 200 installed indoors are connected through one coaxial cable and two twisted lines. The coaxial cable is used to supply the transmit / receive signals TX and RX and the power PR, and the twisted wire of the two wires is used for control.

By separating the RF stage 100, including the antenna, from the main body of the RIU composed of the IF and baseband stages 200 using the coaxial cable and the twisted wire, there is no need to install it indoors or outdoors as in the conventional case. Even indoors, the wireless communication with the wireless base station can be installed flexibly in a location where there is little obstacle.

In addition to the antenna, the RF stage can be installed outdoors, so that the elements of the wireless communication failure due to the weak electric field strength during RF processing are further reduced.

In addition, in the conventional case, since the RF terminal, the IF, and the baseband terminal are configured in one main body, the position to be installed for connection through the port with the subscriber station can be freed from being limited by the length of the connection cable.

In other words, the RF stage 100 including the antenna is installed in a suitable place outdoors, and then connected to the IF and baseband stage 200 through a coaxial cable and two twisted lines.

At this time, when a wireless signal is input from the outside through the antenna, the duplex 101 of the RF terminal 100 receives it and outputs it to the receiving amplifier 102. The reception amplifier 102 amplifies the signal received from the duplex 101 and outputs the amplified signal to the reception mixer 103. Then, the reception mixer 103 mixes the received data signal amplified by the reception amplifier 102 using the supply frequency of the PLL unit and then outputs the received data signal to the reception filter 104. The reception filter 104 filters the received data signal mixed by the reception mixer 103 and then outputs the mixed data to the mux / demux unit 111.

Then, the mux / demux unit 111 muxes the received received data signal and transmits it to the mux / demux 201 of the IF and baseband stage 200 in the room through a cable and a twisted line.

At this time, if the user transmission signal is received from the IF and baseband stage 200 in the process, the RF stage 100 is connected to the reception through the transmission filter 108, the transmission mixer 109, the PLL unit, etc. Is sent out through the reverse process.

Meanwhile, the mux / demux unit 201 of the IF and baseband stage 200 demultiplexes the IF data signal received from the mux / demux unit 111 of the RF stage 100 to the AGC amplifier 202. To the output. The AGC amplifier 202 amplifies the data received through the mux / demux unit 201 and outputs the amplified data to the reception mixer 203. In addition, the reception mixer 203 mixes the reception data signal amplified by the AGC amplifier 202 using the supply frequency of the PLL unit and then outputs the received data signal to the reception filter 204. Then, the reception filter 204 filters the received data mixed by the reception mixer 203 and outputs the filtered data to the A / D converter 205. The A / D converter 205 converts the analog signal of the reception mixer 203 into a digital signal and outputs the digital signal to the modem 206. The modem 206 then demodulates the received data digitally converted by the A / D converter 205 and transmits it to the user device via the user interface 207.

At this time, if the user transmission signal is received from the user device during the process, the IF and baseband stage 200 is controlled by the user interface 207, modem 206, D / D according to the function control of the CPU 208. Through the A converter 209, the transmission filter 210, the transmission mixer 211, the transmission AGC amplifier 212 and the PLL unit, the signal of the user is transmitted to the RF terminal 100 through the reverse process. Send.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, conversions, and modifications are possible within the scope without departing from the technical spirit of the present invention. It will be apparent to those who have knowledge.

According to the present invention, it is possible to install IF and baseband stages which are not influenced by the electric field strength in the main body indoors, and to separate the RF stages which are greatly affected by the electric field strength from the main body, thereby to install the RIU main body indoors. In case of installation, it can be installed in the desired place because it is not influenced by the radio interference area. Also, if the low frequency signal is connected to the baseband installed in the room, the loss of the signal can be almost ignored. Being able to install more outdoors it is possible to provide a high quality service in the wireless communication service with the wireless base station.

Claims (1)

In the subscriber access device of a wide wireless subscriber network, A duplex for transmitting and receiving a radio signal of a wireless base station transmitted and received through the wireless subscriber network, a transceiving amplifier for amplifying a signal transmitted and received with the duplex, and a transceiving mixer for mixing the transceiving data signal amplified by the transceiving amplifier An RF stage installed outdoors including a transmit / receive filter for filtering the transmit / receive data signal mixed by the transmit / receive mixer, and a mux / demux unit for multiplexing / demultiplexing the received signal and the transmit signal output from the transmit / receive filter; A mux / demux unit for multiplexing / demultiplexing IF data signals transmitted / received from the mux / demux unit of the RF stage, an AGC amplifier for amplifying data transmitted / received through the mux / demux unit, and the AGC amplifier. A transceiving mixer for mixing the transceiving data amplified by the transceiving data, a transceiving filter for filtering the transceiving data mixed by the transceiving mixer, and A for converting the analog data filtered by the transceiving filter into digital data or digital data into analog data. A modem for modulating or demodulating / demodulating transmit / receive data digitally converted by the A / D and D / A converters, and a user interface for interfacing the transmit / receive signals between the modem and the subscriber device; IF and baseband stages installed indoors, including the CPU to control the modem and the user interface Wide CD M. A subscriber connection unit of a wireless subscriber access network a separate installation from the main RF stage, characterized in that consisting of.