KR19980037412A - Variable speed ultra high speed data receiver for copper wire - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Variable speed super high speed data receiver for copper wire.

2. The technical problem to be solved by the invention

By using DMT (Discrete Multi Tone) receiver which is a multicarrier modulation method, it is possible to receive the high speed data of up to 51.84 Mbps on the copper wire within 1.5 Km and convert the transmission speed automatically.

3. Summary of Solution to Invention

Before receiving normal data, test data of variable speed, which is transmitted by the transmitting device first, is measured by the BER (Bit Error Rate) measuring device, and whether the BER value is 10-9 or less is fed back to the transmitting device as the BER detection signal. Feedback) to check the most optimal reception speed of the copper wire and to receive normal data, and to use the multicarrier modulation type DMT (Discrete Multi Tone) receiver for ultra-high speed data reception of up to 51.84 Mbps on the copper wire within 1.5 km. Yes.

4. Important uses of the invention

It is used for a variable speed ultra high speed data receiving device of a network device or a terminal.

Description

Variable speed ultra high speed data receiver for copper wire

The present invention relates to a variable speed ultra-high speed data receiver for a copper wire for transmitting ultra-high speed data of up to 51.84 Mbps (bit per second) within a transmission distance of 1.5 km on the same wire as a conventional telephone line. In addition to low-speed data exchange in the copper subscriber network section or the fiber drop section of the FTTC (Fiber To The Curb) subscriber network, it is a receiver for ultra-high speed digital data transmission such as internet, VOD, digital CATV, video data, and HDTV service. Can be used.

In addition, the present invention provides 51.84 Mbps, 25.92 Mbps, and 12.96, which are downlink transmission rates conforming to the short-range baseband asymmetric Physical Medium Dependent (PMD) sublayer standard on the copper / coaxial cable of the DAVIC (Digital Audio-Visual Council) 1.0 Specification. It is a receiver that can provide all the transmission speed of Mbps.

The technical field of the present invention belongs to a receiving device for transmitting a large amount of data at high speed, such as the Internet, VOD (Video On Demand), multimedia services on the copper wire, the conventional technology is a PC modem, ADSL (Asymmetric Digital Subscriber) Line modem and Very High Rate Digital Subscriber Line (VDSL) modem.

Conventional PC modems are widely used as digital data transmission devices such as document exchange, internet connection, and still image exchange over telephone lines, but the maximum reception speed is 36,600 bps, so they are suitable for small data reception, such as VOD, internet, and video. It takes a lot of time to transfer large data. In addition, the conventional ADSL modem has a maximum reception speed of 9 Mbps and receives data relatively higher than that of a PC modem. However, a large amount of data is still required to transmit a large amount of data. In addition, the conventional VDSL modem is capable of receiving high-speed data of up to 51.84 Mbps by improving the ADSL modem, but providing a fixed transmission rate set by the user.

The present invention enables ultra-high speed data reception of up to 51.84 Mbps on a copper wire within 1.5 Km using a multicarrier modulation type DMT (Discrete Multi Tone) receiving unit, and provides a function for automatically converting a transmission speed. The purpose of the present invention is to provide a variable speed ultra-high speed data receiving apparatus that receives normal data after checking the maximum possible transmission speed.

1 is a block diagram of a copper wire variable speed ultra-high speed data receiving apparatus of the present invention;

2 is a block diagram illustrating a Discrete Multi Tone (DMT) receiver of the present invention;

3 is a block diagram of an ultrafast data receiving unit of the present invention;

In order to achieve the above object, the present invention extracts an analog reception signal transmitted through a copper wire from a transmitter and transmits a BER detection signal obtained by measuring BER (Bit Error Rate) of the test reception data of the transmitter to the transmitter through a copper wire. A hybrid transceiver performing a function of feedback, a DMT receiving unit for digitally demodulating an analog received signal received from the hybrid transceiver by a DMT demodulation method and outputting a QAM decoder clock and received buffer input data synchronized with the clock; And receiving the reception buffer input data synchronized with the QAM decoder clock and this clock, and performing BER measurement when the test reception data is received from the transmitter to confirm the data transmission capability of the copper wire at the initial power-on. BER detection signal is transmitted to the hybrid transceiver, the copper data In the case of normal ultra high speed data received from the transmitter after checking the transmission capability, the high speed data receiver includes a high speed data receiver that transmits the data to the data receiver of the network apparatus or the terminal.

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

1 is a block diagram illustrating a configuration of a variable speed ultra-high speed data receiving apparatus for a copper wire according to the present invention.

The hybrid transceiver 1-1 extracts an analog received signal transmitted through a copper wire from a transmitter and transmits it to the DMT receiver 1-2, and measures the BER of the test received data. The BER detection signal of) is fed back to the transmitter through a copper wire. The DMT receiver 1-2 synchronizes the reception buffer input data of 8-bit (Bits) unit by digitally demodulating the analog received signal received from the hybrid transceiver 1-1 by the DMT demodulation method to the QAM decoder clock for ultra-high speed data. It performs the function of transmitting to the receiver 1-3. The ultra-high speed data receiving unit 1-3 receives the receiving buffer input data in units of 8 bits (Bits) synchronized with the QAM decoder clock, and is received from the transmitting apparatus to check the data transmission capability of the copper wire at the initial power-on. In the case of test reception data, BER measurement is carried out to transmit the BER detection signal to the hybrid transceiver (1-1). It performs the function of transferring to the data receiver of the terminal.

FIG. 2 is a detailed configuration diagram of the DMT receiver 1-2, and the operation of the DMT receiver 1-2 will now be described in detail with reference to the accompanying drawings.

The low pass filter 2-1 removes the high frequency component of the analog received signal and transmits the low pass analog received signal that passes only the low frequency component to a programmable gain amplifier 2-2 (PGA). The PGA 2-2 performs a function of amplifying the received low pass analog received signal to maximize the reception level dynamic range, and converts the PGA output signal into an analog / digital converter 2-3 and a clock extractor ( 2-4). The analog / digital converter 2-3 converts the analog PGA output signal into digital serial received data and delivers it to the serial / parallel converter 2-6. The clock extractor 2-4 performs a function of extracting a clock from the PGA output signal, and transfers the extracted FFT clock to the FFT demodulator 2-7 and the 512 divider 2-5. The 512 divider 2-5 divides the FFT clock by 512 and transfers the divided QAM decoder clock to the QAM decoder 2-8 and the ultra-high speed data receiver 1-3. The serial / parallel converter 2-6 converts serial received data in units of one bit into 256 time domain parallel received data and transmits the same to the FFT demodulator 2-7. The FFT demodulator 2-7 demodulates 256 time-domain parallel received data into QAM received symbols on 256 subchannels using the FFT clock from the clock extractor 2-4, and a QAM decoder 2-8. To pass). The QAM decoder 2-8 decodes QAM received symbols on 256 subchannels into 8-bit received buffer input data using the QAM decoder clocks from the 512 frequency dividers 2-5. Decoding) and transmits the same to the high speed data receiver 1-3 with the QAM decoder clock.

3 is a detailed configuration diagram of the ultra-high speed data receiver 1-3, which will be described in more detail with reference to the drawings.

The receiving buffer 3-1 receives and stores the receiving buffer input data in units of 8 bits (Bits) synchronized with the QAM decoder clock and the QAM decoder clock, and then synchronizes the QAM decoder clock with the receiving buffer of 8 bits (Bits). The output data is sent to the demultiplexer 3-2. The demultiplexer 3-2 transfers the receive buffer output data of the input I to the test receive data of the output B when the BER detection signal of the BER measurer 3-4 is set to TTL level 0, and the QAM decoder clock of the input Ic. Passes to the test receive clock of output Bc. If the BER detection signal of the BER measuring instrument 3-4 is set to TTL level 1, the receiving buffer output data of the input I is transferred to the ultra fast receiving data of the output A, and the QAM decoder clock of the input Ic is the ultra fast receiving clock of the output Ac. To pass. In addition, the demultiplexer 3-2 transmits the ultra-fast reception data and the ultra-high speed reception clock in units of 8 bits (Bits) to the ultra-speed reception data interface unit 3-3, and transmits the test reception data in units of 8 bits (Bits). The test receive clock is sent to the BER meter (3-4). The ultra-fast receiving data interface unit 3-3 is connected to the data receiving unit of the network device or the terminal and transmits the ultra-high-speed receiving data and the ultra-fast receiving clock in units of 8 bits (Bits) received from the demultiplexer 3-3. It performs the function of transferring to the data receiver of the terminal. The BER measuring instrument 3-4 transmits the BER detection signal to the demultiplexer 3-2 by setting the BER detection signal to TTL level 0 at the initial stage of power-on, and transmits the test signal transmitted from the transmitting apparatus to confirm the data transmission capability of the copper wire. The BER measurement is performed by receiving the test reception data in 8 bit units synchronized with the clock and the test reception clock from the demultiplexer (3-2). The transmitter transmits 51.84 Mbps of test data as the first setting after power-on, 25.92 Mbps as the second setting, and 12.96 Mbps as the third setting, so that the BER meter (3-4) Determines whether the BER (Bit Error Rate) of each step test data is 10-9 or less and sets the BER detection signal to TTL level 1 if it is 10-9 or less and sets the BER detection signal to TTL level 0 if it is 10-9 or more. It transfers to the demultiplexer (3-2) and the hybrid transceiver (1-1). The BER detection signal received by the hybrid transceiver 1-1 is fed back to the transmitter through a copper wire. That is, if the BER (Bit Error Rate) is more than 10-9 in the BER measurement of the first stage (51.84 Mbps) test data, the BER detection signal is set to TTL level 0 because the abnormal data transmission, and the transmitted BER detection signal is a hybrid transceiver (1--1). It is fed back to the transmitter through 1) to send the second stage (25.92 Mbps) test data to the transmitter. If the BER (Bit Error Rate) is more than 10-9 during the BER measurement of the second stage test data, the BER detection signal is set to TTL level 0 because it is abnormal data transmission, and the transmitted BER detection signal is transmitted through the hybrid transceiver 1-1. It is fed back to the device to send the third stage (12.96 Mbps) test data to the transmitting device. If the BER (Bit Error Rate) is less than 10-9 when measuring the BER of the test data for each step, normal data transmission is possible, so that the BER detection signal is set to TTL level 1 and the demultiplexer (3-2) and the hybrid transceiver (1-1). To pass. The transmitted BER detection signal is fed back to the transmitting apparatus through the hybrid transceiver 1-1, and receives normal ultra-fast reception data of the corresponding (first, second or third) stage from the transmitting apparatus. In addition, since the BER detection signal is TTL level 1, the demultiplexer 3-2 demultiplexes the reception buffer output data of the inputs I and Ic and the QAM decoder clock into 8 bits (Bits) of ultra fast reception data and ultra fast reception clock. To the ultra-fast receiving data interface unit 3-3.

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

The present invention configured and operated as described above can receive ultra-high speed data of up to 51.84 Mbps within a transmission distance of 1.5 km or less on the same copper line as a conventional telephone line, and is a fully-wired subscriber network section or FTTC (Fiber To The Curb). It can be applied to a variable speed ultra-high speed data receiver of a network device or a terminal in a copper drop section of a subscriber network.

Claims (3)

A hybrid transceiver which extracts an analog reception signal transmitted from a transmitter through a copper wire and feeds back a detection signal measuring bit error rate of the test reception data of the transmitter to the transmitter through a copper wire; DMT receiving means for digitally demodulating the analog received signal received from the hybrid transceiver by a DMT demodulation method and outputting a QAM decoder clock and received buffer input data synchronized with the clock; And Receives the QAM decoder clock and the receive buffer input data synchronized with the clock, and performs bit error rate measurement in the case of the test received data received from the transmitter to confirm the data transmission capability of the copper wire at the initial power-on. It transmits a bit error rate detection signal to the hybrid transceiver, and checks the data transmission capability of the copper wire, and in the case of normal ultra-high-speed received data received from the transmitting device includes a high-speed data receiving means for transmitting to the data receiving unit of the network device or the terminal. Variable speed ultra-high speed data receiving device for copper wire. The method of claim 1 The DMT receiving means, Low-pass filtering means for removing a high frequency component of the analog received signal and performing a function of passing only a low frequency component; Amplifying means for amplifying the received low-frequency analog signal so that a reception level dynamic range is maximized; Analog / digital converting means for converting the analog output signal of the amplifying means into digital serial received data; Clock extracting means for extracting a clock from the output signal of the amplifying means; Dividing means for dividing the FFT clock extracted by the clock extracting means and outputting a QAM decoding clock; Serial / parallel conversion means for performing a function of converting serial reception data output from the analog / digital conversion means into time-domain parallel reception data; FFT demodulation means for demodulating time-domain parallel received data output from the serial / parallel conversion means into QAM received symbols on a subchannel using the FFT clock extracted by the clock extraction means; And And QAM decoding means for decoding QAM received symbols on a subchannel output from the FFT demodulation means into received buffer input data by using the QAM decoding clock output from the division means. Variable speed super high speed data receiver for copper wire. The method of claim 1, The ultra high speed data receiving means, Receiving buffering means for receiving and storing the QAM decoding clock and the reception buffer input data synchronized with the clock, and then outputting them as reception buffer output data in synchronization with the QAM decoding clock; Demultiplexing means for receiving the data from the reception buffering means and the QAM decoding clock and outputting the received data as ultra high speed received data and ultra high speed received clock or test received data and a test received clock according to the bit error rate detection signal on the output side; Ultra-high-speed reception data interface means for transmitting the ultra-high speed reception data and the ultra-high speed reception clock received from the demultiplexing means to a data receiver of a network device or a terminal; And Initially when the power is turned on, the bit error rate detection signal is transmitted to the demultiplexing means, and the test data sent from the transmitting apparatus to check the data transmission capability of the copper wire is measured in step by step, and the bit error rate measurement for outputting the detection signal. A variable speed ultra-high speed data receiver for copper wire, comprising means.