KR100406966B1 - Tx / Rx unit in wireless subscriber network channel self with error detection and correction, and its error detection and correction method - Google Patents

Abstract

The present invention relates to a transmission / reception unit in a wireless subscriber network channel self having an error detection and correction function, and an error detection and correction method thereof.

A transmitting / receiving unit mounted in a channel self of a wireless subscriber network through a backboard and transmitting and receiving data through a multi-channel line data bus,

An error provided in the transmitting unit to block-code and encode digital data of the received I and Q signals into a K bit data bit line and an NK bit parity line for error detection and correction, and then transmit them to a multi-line data bus on a back board. Detection and correction encoding circuitry;

And an error detection and error correction decoding circuit unit having a display unit for performing error detection and correction operations on the data received from the multi-line data bus into a reception unit, decoding the data, and displaying the error detection and correction operations. do.

Accordingly, when an error occurs in the channel self, it is possible to easily detect which transmission path in the transmission path from the transmission unit through the backboard to the receiving unit and to perform correction accordingly.

Description

Transmitter / receiver unit in wireless subscriber network channel self having error detection and correction function and its error detection and correction method

The present invention relates to a unit mounted in a channel card shelf of a wireless access network system of a code division multiple access method, and more particularly, a unit mounted for transmitting and receiving data to and from various channel cards using a data bus on a backboard of the channel card shelf. By providing an error detection and correction block code circuit therein, the present invention relates to a channel self unit in a wireless subscriber network and an error detection and correction method thereof having an error detection and correction function for improving the reliability of equipment and detecting defects of channel cards.

Wireless Local Loop (WLL) system is a system that replaces a certain distance between each subscriber's home and public circuit switch by wireless instead of wired in existing PSTN system. It is responsible for establishing a link between a wireless subscriber station (RSU) that receives a signal from a wireless subscriber station (RSU), a wireless base station that is responsible for connecting and disconnecting a bearer wirelessly with a wireless subscriber station, and a call with an existing public circuit switched network (PSTN). It consists of a wireless subscriber line network switch. The wireless subscriber network (WLL) system has the advantage that it is easier to install the telephone network than the existing wired network system, the facility expansion cost is low, and the flexibility of the network design according to the increase of subscribers.

The channel card itself in a general wireless subscriber network system is equipped with several channel card units through the back board in addition to the IF receiving unit that receives and processes the IF signal from the outside, and data transmission and reception between the IF receiving unit and the channel card unit is performed on the back board. Via bus.

IF receiving unit receives analog IF signal from outside, QPSK demodulates into I, Q signal through QPSK demodulator, and then converts A / D through A / D converter and then mounts several channels mounted on the backboard through data bus on the backboard. Transfer digital data to the card unit. The channel card unit receives the digital data transmitted from the IF receiving unit and performs baseband processing.

However, when data is transmitted through the backboard, data may sometimes be broken due to some line characteristics such as noise or mismatch of impedance on the transmission path, an error may occur, or a bad unit may occur during production of the device or device degradation. It is necessary to inspect the unit one by one because it may cause errors.

Accordingly, in order to know whether the unit and the back board are defective in the channel self, a test analog sine wave is input to the input terminal of the IF receiving unit, and then the output of the channel card unit, which is output as digital data, is converted into an analog to a logic analyzer I had to use and try to take parts by hand. In addition, even when a defect is detected through the logic analyzer, it is difficult and time-consuming to determine whether the IF receiving unit is defective, the backboard is defective, or the channel card is defective.

As described above, when digital data of received I and Q signals are transferred to multiple channel cards by using a multi-line data bus on a back board, or when the bad states of these transceiver units and the back board are checked, or There is a problem in that it is difficult to verify the presence or absence of defects during the equipment assembly inspection.

Accordingly, the present invention has been made to solve the above problems, it is possible to detect the error occurrence when transmitting and receiving data between the transmission and reception unit within the channel card self, and to correct the error and to allow the user to easily recognize It is an object of the present invention to provide a transmission / reception unit in a wireless subscriber network channel self having an error detection and correction function and an error detection and correction method thereof.

In order to achieve the above object, the present invention provides a transmission and reception unit for transmitting and receiving data through a multi-channel line data bus mounted on a channel board in a wireless subscriber network,

An error provided in the transmission unit to block-code and encode the digital data of the received I and Q signals into K bit data bit lines and NK bit parity lines for error detection and correction, and then transmit them to the multi-line data bus on the back board. Detection and correction encoding circuitry;

An error detection and error correction decoding circuit portion having an error detection and correction operation for decoding the data received in the reception unit from the multi-line data bus, and displaying the error detection and correction operation; A transmitting / receiving unit in a wireless subscriber network channel self having a correction function is provided.

Another aspect of the present invention is a method for detecting errors in a transmission / reception unit for transmitting and receiving data through a multi-channel line data bus mounted on a channel board in a wireless subscriber network.

An error detection and correction transmission step of transmitting data to a multi-channel line data bus by performing decoding for error detection and correction in a transmission unit;

An error correction decoding step of decoding the data received from the multi-line data bus by the error detection and correction step to perform error detection and correction of the data, and displaying the progress of the error correction operation during the error correction decoding step. A method for detecting and correcting errors in a transceiver unit in a wireless subscriber network channel including an error correction task display step for allowing a user to recognize a current error correction task is provided.

1 is a block diagram of a channel self provided with an encoding circuit and a decoding circuit for error detection and correction according to the present invention.

<Description of the sign>

10: IF Receive Unit 11: QPSK Demodulator

12: A / D converter 13: Error detection and correction coding circuit

20: Backboard data bus 21: Multi data bit line

22: multi parity bit line 30: channel card unit

31: error detection and correction decoding circuit 32: baseband processing unit

100: channel card self

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

1 is a block diagram illustrating a channel self provided with an encoding circuit and a decoding circuit for error detection and correction according to the present invention.

As shown, the channel card self 100 in the wireless subscriber network system is provided with an IF receiving unit 10 for receiving and processing an IF signal from the outside, and eight channel card units 30.

Data transmission and reception between the IF receiving unit 10 and the channel card unit 30 is performed via the data bus 20 on the backboard.

The IF receiving unit 10 receives an analog IF signal from the outside and QPSK demodulator 11 for QPSK demodulation into I and Q signals, and an A / D converter 12 for A / D converting the demodulated signal; It consists of an error detection and correction encoding circuit 13 which encodes the A / D converted digital data for error detection and correction and transmits the digital data to a plurality of channel card units mounted on the back board through a data bus on the back board.

The channel card unit 30 receives the digital data of the IF receiving unit 10 through the data bus 20 of the backboard, decodes the encoded data again, detects whether an error occurs, and detects an error when an error occurs. Correct. In addition, by indicating that the operation is being performed when an error occurrence is detected or when an error is corrected, the user can view the indication to know that an error has occurred and that the error is corrected. Make it possible.

The error detection and correction coding circuit 13 performs error control coding on data to be transmitted to the data bus. In the coding method, block coding is used among block coding and convolutional coding.

The K bits are used as multi data line bits 21, and the n-K bits are multi parity line bits 22 appended to the header of the data bits. Therefore, in the IF receiving unit 10, the encoder 13 for error detection and correction is provided, and the decoder 31 is provided in the channel card unit 30. send. In the channel card unit 32 receiving the K data bits, the combination of the K data bits and the parity extra redundancy line bits can be used to determine where the error occurred based on the coding technique adopted. .

The parity extra redundancy line bit is provided for the occurrence and correction of the error when an error occurs in any one of the data bits transmitted through the multi-line. Depending on the degree of error that can be corrected to the error.

The error detection and correction decoding circuit 31 provided in the channel card unit 30 detects and corrects an error and extracts a signal indicating that it is in operation when the error is detected. When an error occurs and an error is corrected, the LED is a display means. Since it can be displayed through the user can respond to the occurrence of the error in the channel card itself (100) and it is possible to know that the error is corrected when the initial error occurs, it is possible to respond to the occurrence of the error, The LEDs provided in each channel card unit indicate whether or not an error has occurred and in which corrective operation. It is also possible to increase the parity line to increase error correction.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is common knowledge in the art that various substitutions, conversions, and changes can be made without departing from the technical spirit of the present invention. It will be apparent to those who have

According to the present invention, error detection and correction coding and decoding circuits are additionally inserted into units using a backboard for high-speed data transmission and reception between units. You can check whether there is an error. In addition, during operation of the equipment, the function of the error correction circuit can be used to detect intermittent instability during data transmission between units and to correct data errors occurring at this time, thereby reducing errors in data transmitted on the bus.

Claims (2)

A transmitting / receiving unit mounted in a channel self of a wireless subscriber network through a backboard and transmitting and receiving data through a multi-channel line data bus, An error provided in the transmitting unit to block-code and encode digital data of the received I and Q signals into a K bit data bit line and an NK bit parity line for error detection and correction, and then transmit them to a multi-line data bus on a back board. Detection and correction encoding circuitry; And an error detection and error correction decoding circuit unit having a display unit for performing error detection and correction operations on the data received from the multi-line data bus into a reception unit, decoding the data, and displaying the error detection and correction operations. A transmission / reception unit in a wireless subscriber network channel self having an error detection and correction function. In the error detection method of the transmission and reception unit for transmitting and receiving data through a multi-channel line data bus is mounted via a backboard in the channel self of the wireless subscriber network, An error detection and correction transmission step of transmitting data to a multi-channel line data bus by performing encoding for error detection and correction in a transmission unit; An error correction decoding step of decoding the data received from the multi-line data bus by the error detection and correction step to perform error detection and correction of the data, and displaying the progress of the error correction operation during the error correction decoding step. And an error correction operation display step of allowing a user to recognize a current error correction operation.