KR20030037768A - Asynchronous power line communication apparatus - Google Patents

Abstract

PURPOSE: An asynchronous power line communicating device is provided to transmit data at a very high rate by using an asynchronous signal detecting method and simplify a transmitting and receiving unit. CONSTITUTION: An impulse-making circuit unit(130) codes a data pulse outputted from a mobile communication terminal(110) and information on a high interval and a low interval of the coded output pulse into impulse signals with a predetermined time width. An impulse radio signal-making circuit unit(140) converts the impulse signal into a sine wave impulse radio signal to heighten power of the output signal. A transmission/receiving signal combining and noise canceling unit(150) combines the impulse radio signal to a power line(160) and transmits the combined signal to the other party, and receives an impulse radio signal transmitted through the power line(160) from the other party and cancels its noise. A DLL(Delay Locked Loop) and equalizer(170) amplifies power of the noise-canceled impulse radio signal to correct a phase delay and extract an impulse signal with a predetermined time width, and compensates distortion of the impulse signal to output a shaped sending pulse signal. A level clipping and impulse radio signal separating and detecting unit(180) clips a portion above a certain level of the output signal of the DLL and equalizer(170) and separates and detects positive and negative impulse radio sections. A data pulse reproducing unit(190) converts the positive impulse section into a positive set pulse and phase-inverts the negative impulse section to a positive reset pulse, arranges them temporally, checks each pulse, generates a high level pulse signal if a set pulse is detected, generates a low level pulse signal if a reset pulse is detected, reproduces a sending data pulse signal, decodes it, and transmits the decoded signal to the information communication terminal(110) through the interface unit(120).

Description

Asynchronous power line communication device {ASYNCHRONOUS POWER LINE COMMUNICATION APPARATUS}

The present invention relates to network transmission, and more particularly, to an asynchronous power line transmission apparatus in a power line transmission method.

Power line communication is a communication method using a power line such as AC 110V / 220V as a communication line, and has the advantage that communication can be performed between communication terminals without installing a separate communication line.

The power line communication device is used for ultra high speed power line communication modem, power line communication unit of various sensors and driving devices, and sensor unit for measuring power line of electric power, water, gas, etc., to build a high speed communication LAN or power line communication unit for industrial automation. The range of applications and applications is wide, including usage and automatic remote measurement of the Internet.

Therefore, in order to use the power line as a communication channel, many studies on power line transmission characteristics using FSK, PSK modulation, or the like have been conducted, and practical use of the apparatus employing these modulation methods is also made.

However, most of the devices practically used are low speed (less than 9.6 Kbps) and high speed (more than 2 Mbps) are under development by a few companies, but no products are available until the practical stage.

In general, the conventional power line transmission method employs a carrier synchronization method to perform communication.

In the power line communication method researched and developed up to now, there is a problem of lowering the reliability of communication due to the load fluctuations caused by the ON / OFF operation of various electric devices connected to the power line and the special noise environment in which these devices occur. .

That is, in the conventional communication method such as FSK or PSK, which adopts a carrier method between transmission and reception, the signal constant is severely changed due to the noise environment of the power line, which is a voltage distribution line, and the operation and variation of various loads. In addition to the low speed of the circuit, it also has the disadvantage of low signal detection reliability.

The reason why the speed of signal transmission is low and the reliability of signal detection is low is that the power line may be caused by difficulty in synchronous control due to severe distortion of the received signal due to noise or characteristic change as a transmission channel of the signal.

Therefore, in order to be able to cope with load fluctuations and noise environments in power lines, it is necessary to solve the problem of coping with synchronous control and efficient noise-resistant communication.

Accordingly, the present invention provides an impulse radio signal using a half cycle or one cycle of a sinusoidal shock pulse (hereinafter referred to as "a half cycle or a cycle of a sinusoidal impulse radio signal") in order to improve the conventional problem. Create a transmission method.

That is, an object of the present invention is to provide an asynchronous power line communication device invented so that high-speed data transmission of high reliability can be performed by using an asynchronous signal detection method in an impulse radio signal transmission method, and a simple transmission / reception device can be configured. There is this.

1 is a configuration diagram showing a network of a general power line communication method.

2 is a block diagram of an asynchronous power line communication device for an embodiment of the present invention.

3 is an operational waveform diagram in each part of FIG. 2;

** Explanation of symbols on the main parts of the drawing **

120: interface unit 130: impulse circuit unit

140: impulse wireless signal circuit unit 160: transmit / receive signal combination and noise removing unit

170: DLL and equalizer

180: level clipping and impulse radio signal separation detection unit.

190: data pulse regeneration unit

In order to achieve the above object, the present invention provides an impulse circuit unit for encoding data in an information communication terminal and converting the rising edge and the falling edge of a data pulse into positive impact pulses having a predetermined time width. An impulse radio signal circuit unit for converting an impulse pulse into a half cycle or one cycle of a sinusoidal impulse radio signal inverted from each other so as to be suitable for power line transmission;

A DLL and an equalizer which amplify the power of the impulse radio signal received from the power line, remove the noise, detect the phase difference of the amplified impulse radio signal, correct the phase difference, and compensate for the distortion of the signal; Phase difference correction and distortion After clipping a certain level of the signal to remove the secondary noise to separate and detect the positive (+) and negative (-) of the impulse radio signal corresponding to the HIGH and LOW interval of the transmission data pulse signal The level clipping and impulse radio signal separation detector and the positive impulse interval in the level clipping and impulse radio signal separation detector are positive set pulses and the negative impulse interval is positive. After converting into reset pulse of, and setting up in time and checking every pulse, if pulse of set is detected, pulse signal of high level is generated, and if pulse of reset is detected, pulse signal of low level is generated. And a data pulse regeneration unit for generating and reproducing data pulses, decoding the reproduced data pulses, and transmitting them to the information communication terminal.

The half-cycle or one-cycle sinusoidal shock pulse, that is, the impulse radio signal used in the present invention is a signal having a time average of '0' and a signal time width of several tens [n [sec]] or less. The effects of background noise, impedance change, which is a line constant due to loads and fluctuations of various electric devices, are characterized by maintaining a very stable signal transmission characteristic than a carrier transmission method.

In addition, the present invention can maintain a stable and strong transmission characteristics such as background noise and power line load fluctuations in the power line by converting the information on the HIGH section and LOW section of the data pulse signal into an impulse radio signal for transmission.

In addition, in the present invention, the level of random burst-noise pulses that may occur during load operation or fluctuation in a power line is 20 to more than the magnitude of power line background noise having an amplitude magnitude of [mu [V``]]. It has a high level of 50 [dB] (10 ~ 300 times), but the time width of the impact noise pulse is generally [ Because of the low frequency characteristics expressed in], impulse radio signals with high frequency characteristics having a time width of several tens [n [sec]] or less can be removed by a frequency separation method.

Therefore, the present invention improves the reliability of data pulse reproduction in the data pulse reproduction circuit by completely eliminating random special noise by employing the frequency separation method of the slave two-stage processing in the noise cancellation circuit, and the time width of several [n [ sec]] enables ultra-high speed data transmission by an impulse radio signal transmission method of less than or equal to.

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

In a general power line transmission network, as shown in FIG. 1, a power line communication device 103 and 105 for data transmission and reception are connected to a single-phase two-wire power line 104, and the power line communication device 103 ( 105 is configured to be connected to the information communication terminals 101 and 107 through the interface devices 102 and 106, respectively.

FIG. 2 is a block diagram of an asynchronous power line communication apparatus for an embodiment of the present invention. As shown therein, a data pulse outputted from the information communication terminal 110 by a clock generator of a predetermined frequency is encoded and encoded. An impulse circuit unit 130 for converting information on the HIGH and LOW sections of the output pulse into an impulse signal having a predetermined time width, and converting the impulse signal into a half-cycle or one-cycle sinusoidal impulse radio signal. Impulse radio signal circuit unit 140 for increasing the power of the output signal and the impulse radio signal coupled to the power line 150 to transmit to the other side and the other side impulse radio signal transmitted through the power line 160 Transmitted / received signal combining and noise removing unit 150 for receiving and removing noise, and transmitting / receiving signal combining and noise removing unit 150 in which noise is removed After amplifying the power of the radio signal, the phase delay is corrected by initial synchronization acquisition and tracking by a DLL, and then an impulse signal of a predetermined time width is extracted, and equalization is performed to compensate for the distortion of the impulse signal. The DLL and the equalizer 170 for outputting the output pulse signal, and the output signal of the DLL and the equalizer 170 are clipped more than a predetermined level to remove the second noise and correspond to the HIGH and LOW sections of the output pulse signal. A level clipping and impulse radio signal separation detector 180 for separating and detecting a positive (+) and a negative (-) signal of an impulse radio signal, and a positive (+) output from the level clipping and impulse radio signal separation detection unit 180. When the impulse section of is converted into a positive set pulse and the negative impulse section is inverted into a positive reset pulse, the phase is arranged in time, and every pulse is checked and a set pulse is detected. HIGH level pulse When generating a signal, and when a reset pulse is detected, generates a low level pulse signal to reproduce the transmitted data pulse signal, decodes it, and transmits the data pulse to the information communication terminal 110 through the interface unit 120. It consists of a part 190.

The interface unit 120 is a circuit for matching the impulse circuit unit 130 and the data pulse regeneration unit 190 with the information communication terminal 110.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

When the data is transmitted to the other side by connecting to the power line communication network, a data generator as shown in FIG. 3 (a) is input from the information communication terminal 110 through the interface unit 120 by a clock generator capable of generating a predetermined data transmission rate. When the impulse circuit unit 130 adds an error correction code to the data pulse, and the data pulse to which the error correction code is added is positively defined by a predetermined time width corresponding to the HIGH and LOW sections of the data pulse, respectively. After converting into an impulse signal of) is output to the impulse wireless signal circuit unit 140.

At this time, the impulse radio signal circuit unit 140 receives an impulse signal from the impulse circuit unit 130 and has a predetermined time in the unit of tens [p [sec]] to several tens [n [sec]] with respect to the rising edge of the data pulse. Convert one half cycle of positive width or one cycle of sinusoidal impulse radio signal, and if '1' data appears continuously, positive half cycle or one cycle for each pulse interval of data bits Is converted into an impulse radio signal of, and a positive half cycle or one cycle of a predetermined time width of tens [p [sec]] to several tens [n [sec]] is applied to the falling edge of the data pulse. After converting into a sinusoidal impulse radio signal and continuously displaying '0' data, it is converted into a positive half cycle or one cycle impulse radio signal every pulse interval of the data bit, and then amplified power. The signal of the waveform as shown in FIG. It is coupled to the power line 160 using a pulse transformer provided in 0) and transmitted to the other side.

Meanwhile, when receiving a transmission signal from the other side through the power line communication network, the transmission / reception signal combining and noise removing unit 150 receives an impulse radio signal of the other side transmitted to the power line 160 through the pulse transformer and then subordinates 2. Power line noise is removed by the frequency separation method of the stage to detect an impulse radio signal as shown in FIG.

The transmit / receive signal combination and noise remover 150 amplifies the power of the weak impulse radio signal received through the pulse transformer and outputs the power to the DLL and the equalizer 170.

The DLL and the equalizer 170 compensate for the phase delay by the initial synchronization capture and tracking by the DLL, and then extract an impulse signal having a predetermined time width as shown in Fig. 3 (c) and output its output by equalization. After multiplying the signal to compensate for the distortion of the extracted impulse signal, as shown in FIG. 3 (d), the outputted pulse signal is output to the level clipping and impulse radio signal separation detector 180.

The level clipping and impulse radio signal separation detector 180 performs a second noise cancellation as shown in FIG. 3 (e) (f) by clipping a predetermined level or more with respect to the output signal from the DLL and the equalizer 170. A positive (+) and a negative (-) of an impulse radio signal corresponding to the HIGH and LOW sections of the transmitted data pulse signal from which the noise is removed are separated and detected and output to the data pulse reproducing unit 190.

The data pulse reproducing unit 190 converts a positive impulse section output from the level clipping and impulse radio signal separation detecting unit 180 into a positive set pulse and converts a negative impulse section. Phase reset and converted to a positive reset pulse and the positive set pulse corresponding to the half-cycle or one-cycle sinusoidal impulse radio signal as shown in Fig. 3 (e) (f) and 1 Each pulse is checked for the positive (+) reset pulse corresponding to a two-cycle or one-cycle impulse radio signal to generate a pulse signal of the HIGH level when the pulse is a set pulse, and a pulse of the LOW level when the pulse is a reset pulse. A signal is generated and reproduced after the transmission data pulse signal is decoded and input to the information communication terminal 110 through the interface unit 120.

As described in detail above, the present invention provides a level of random impact noise pulses generated at load fluctuations in the power line by 20 to 50 [dB] than that of power line background noise having an amplitude magnitude of [mu [V ′]]. (10 ~ 300 times larger) level, but the time width of the impact noise pulse is generally [ Since the low frequency characteristic is expressed in] units, the impulse radio signal having a high frequency characteristic having a time width of several tens [n [sec]] or less can be removed by a frequency separation method.

Therefore, in consideration of random special noise and received signal with high waveform distortion, the noise canceler adopts the frequency separation method of dependent two-stage processing, and removes the noise and normalizes the received waveform in the DLL and equalizer. In addition to improving the reliability of data pulse reproduction, there is an effect of enabling ultra-high speed data transmission by an impulse radio signal transmission method having a time width of several tens [n [sec]] or less.

In addition, the present invention has a low attenuation characteristic of the power line for the impulse radio signal transmitted with a predetermined time width and the signal attenuation effect in the electrical outlet is extremely fine, so that the transmission is performed at a very low signal level, electromagnetic interference (EMI) Not only does it cause a problem, but there is an effect of enabling data transmission having a uniform signal transmission characteristic even in a long distance transmission.

Therefore, the present invention is the construction of a high-speed power line communication LAN system in the radius 4-500 [m] range, construction of CCTV network, construction of factory automation network, construction of underground wireless relay network, construction of home appliance information network and various electrical and mechanical It can be used for various purposes such as device control and remote measurement.

Claims (5)

A power line communication device, An impulse radio signaling means for converting an output data pulse from the information communication terminal into an impulse radio signal having a predetermined time width and transmitting the impulse radio signal to a counterpart through a power line, Noise canceling and equalization means for removing noise mixed in a signal received from a power line and correcting waveform distortion caused by a change in power line characteristics to output a signal of a shaped waveform; and a predetermined level for the noise canceling and shaped signal. Level clipping and impulse radio signal separation detecting means for separating and detecting positive and negative impulse radio signals by clipping the above, and positive and negative impulse radio signals separated and detected above. Converting into positive set pulses and positive reset pulses, and inspecting each pulse to reproduce transmission data pulses and transmit them to the information communication terminal. An asynchronous power line communication device, characterized in that. 2. The apparatus of claim 1, wherein the noise removing and equalizing means receives a signal transmitted through a power line and removes noise by frequency separation to detect an impulse radio signal, and an impulse radio detected above. Amplify the signal by a predetermined level, correct the phase delay by the initial synchronization acquisition and tracking by the DLL for the amplified impulse radio signal, extract the impulse signal of a certain time width, and output its output signal by equalization and An asynchronous power line communication apparatus comprising a equalizer and a DLL for outputting a standardized impulse radio signal by multiplying an impulse signal having a predetermined time width to compensate for signal distortion. The method according to claim 1, wherein the level clipping and impulse radio signal separation detecting means clips a predetermined level or more with respect to the output signal of the noise removing and equalizing means, and removes the second noise to remove the noise corresponding to the HIGH and LOW intervals of the transmitted data pulse signal. And outputting a (+) clipping impulse radio signal and a negative (-) clipping impulse radio signal to a signal reproducing means. The method of claim 1, wherein the impulse wireless signaling means receives and encodes a transmission data pulse from the information communication terminal, and then a predetermined time period for each of the HIGH and LOW sections corresponding to the rising and falling edges of the encoded output pulse. An impulse circuit section for converting an impulse signal having a width, and an impulse radio signal circuit section for converting the impulse signal into a half-cycle or one cycle of a sinusoidal impulse radio signal inverted in phase with each other. Powerline communication device. The method of claim 1, wherein the signal reproducing means converts positive and negative impulse radio signals from the level clipping and impulse radio signal separation detecting means into positive sets and reset pulses, respectively. Arranged in time and detecting a pulse to generate a high level pulse signal when a set pulse is detected, and generate a low level pulse signal when a reset pulse is detected to reproduce and decode the transmitted data pulse. Asynchronous power line communication device.