KR100388968B1 - bit error testing device of the channel incorder/decorder in the WLL terminal system - Google Patents

Abstract

The present invention provides a bit error measuring apparatus for receiving data of a WLL terminal system including a transmitter and a receiver, wherein the transmitter passes the transmission data output from the modulator according to the test control signal of the controller or executes a test mode. A first mux for selectively outputting the first mux, a pattern generator for generating a specific pattern signal for encoding when the test mode of the first mux is set, and the transmission data output from the first mux as channel encoding to be output as transmission symbol data Equipped with a channel encoder,

The receiver includes a channel decoder for decoding the demodulated received symbol data into an original signal, a pattern generator for generating the same pattern signal as the pattern signal generated by the pattern generator of the transmitter, and the received data detected at a rear end of the channel decoder. Or a second mux for selectively muxing the output data of the channel decoder and the pattern signal of the pattern generator according to the test control signal of the controller, and encoding the received data output from the second mux in the same manner as the channel encoder of the transmitter. A first comparator for comparing bit symbol at the front end of the channel decoder by comparing the channel encoder with the received symbol data of the input terminal of the channel decoder and the re-encoding symbol data of the channel encoder, and the received data and pattern generator of the output terminal of the channel decoder. A second error that detects a bit error at a rear end of the channel decoder by comparing the pattern signal of Provided are a bit error measuring apparatus for a channel encoder / decoder of a WLL terminal system having a comparator.

The present invention as described above includes a means for switching the signal of the pattern generator on the transmitting side of the WLL modem and a plurality of means for measuring the bit error of the transmission data at the front and rear ends of the channel decoder on the receiving side. By measuring, even if the reception state of the WLL channel signal is poor, the bit error of the received channel signal is accurately detected, thereby improving the reliability of the bit error measurement accordingly, as well as the bit of the channel signal at the front and rear ends of the channel decoder on the modem receiving side. Since errors are measured separately, the accuracy of bit error determination can be secured accordingly.

Description

Bit error testing device of the channel incorder / decorder in the WLL terminal system}

The present invention relates to a bit error measuring apparatus for a channel encoder / decoder of a WLL terminal system, and more particularly, means for switching a signal of a pattern generator on a transmitting side of a WLL modem and a bit error of transmission data in front and rear of a channel decoder on a receiving side. The WLL is provided with a plurality of means for measuring the bit error of the channel signal, so that even if the reception state of the WLL channel signal is poor, the bit error of the received channel signal can be accurately detected, thereby improving the reliability of the bit error measurement. The present invention relates to a bit error measuring apparatus for a channel encoder / decoder of a terminal system.

In general, a wireless local loop (WLL) system is a telephone system that wirelessly connects subscriber lines within a distance of about 2-6 [km] from a base station without using a conventional telephone line. Many WLL-type systems have been developed and used, such as satellite systems, fixed microwave systems, cellular technology systems, and cordless systems. Used.

The system using this cellular technology can coexist with the same network as the cellular mobile phone or PERSONAL COMMUNICATION SERVICE (PCS), and can cover a wider area, making the network more economical.

In the WLL terminal system applying the cellular technology, a modem 70 is usually provided. A TX code modulator 71 and an RX code demodulator 72 are provided inside the modem 70. The TX code modulator 71 and the RX code demodulator 72 include a transmitter and a receiver of a bit error measuring apparatus for measuring bit errors of WLL channel signals.

Then, referring to FIG. 1, the bit error measuring apparatus provided in the modem of the conventional WLL terminal system as described above is modulated by a TX signal modulator 71 to a communication signal output from a lower voice signal processor 73. And a channel encoder 76 which is a transmitter of a bit error measuring apparatus for encoding and outputting the modulated transmission signal outputted from the modulator 74 to the RF unit 75.

In addition, the RX code demodulator 72 uses a demodulator 77 for demodulating the received signal output from the RF unit 75 and a bit error of a channel signal using the demodulated received signal of the demodulator 77. A receiver 78 for measuring a signal is provided. The receiver 78 decodes the received signal output from the demodulator 77 and outputs the same code as the encoding of the transmitting side to receive the received data output from the channel decoder 79. And a comparator 81 for comparing and outputting the received signal encoded by the channel encoder 80 with the received signal detected at the front end of the channel decoder 79.

Meanwhile, referring to the operation of the conventional bit error measuring apparatus as described above, first, the voice signal processing unit 73 of the WLL terminal 82 inputs a transmission signal to the modulation unit 74 of the TX code modulation unit 71. In this case, the modulator 74 modulates the transmission signal and outputs the modulated signal to the channel encoder 76. Then, the channel encoder 76, which is a transmitter of the bit error measuring apparatus, encodes the input transmission signal into a set channel code signal and outputs it to the RF unit 75. The RF unit 75 performs RF signal processing on the channel-coded transmission signal of the input channel encoder 76 so as to generate a call by call exchange control of a wireless switching center (WSC) 83 of the corresponding WLL terminal 82. It is transmitted to the RF unit 75.

Then, the RF unit 75 of the other WLL terminal 82 in which the call is formed processes the received signal as an RF signal and outputs the received signal to the demodulation unit 77 of the RX code demodulation unit 72. The demodulator 77 demodulates the received signal and outputs it to the channel decoder 79 of the receiver 78. In addition, the channel decoder 79 decodes the received received signal using the same code as that set at the transmitting side, and then outputs the received signal to the channel encoder 80 of the voice signal processor 73 and the receiver 78. Then, the voice signal processing unit 73 processes the input received signal by a voice signal signal to execute a normal voice call. At this time, the decoded received signal inputted to the channel encoder 80 of the receiver 78 is encoded by the channel encoder 80 and input to the comparator 81. Then, the comparator 81 compares the bit error of the current channel signal by comparing the received signal of the currently input channel encoder 80 with the received signal detected by the input terminal of the channel decoder 79. At this time, the comparator 81 determines that the channel signal is normally received without a bit error if the encoded signal of the currently input channel encoder 80 and the received signal detected by the input terminal of the channel decoder 79 are not different from each other. If there is a difference in the values of the 79 and 80, it is determined that there is a bit error and the resultant signal is output so that the WLL terminal 82 takes appropriate measures.

However, in the conventional bit error measuring apparatus as described above, when the channel state is poor and the signal-to-noise ratio is low, the reliability of the received data is also lowered. In this case, the comparator 81 receives only the received data whose reliability is low at the input of the channel decoder 79. There is a problem in that the accuracy of the bit error measurement is considerably degraded since it is detected and used as reference data.

Therefore, the present invention has been invented to solve the above-mentioned general problems, and means for switching the signal of the pattern generator on the transmitting side of the WLL modem and measuring the bit error of the transmission data in front and rear of the channel decoder on the receiving side. By measuring a bit error of a channel signal by providing a plurality of means, even if the reception state of the WLL channel signal is poor, the bit error of the received channel signal can be accurately detected, thereby improving the reliability of the bit error measurement system. It is an object of the present invention to provide a bit error measuring apparatus of a channel encoder / decoder.

Another object of the present invention is to measure the bit error of the channel signal at the front and rear ends of the channel decoder on the modem receiving side, so that the bit error measurement of the channel encoder / decoder of the WLL terminal system can ensure the accuracy of the bit error determination accordingly. To provide a device.

In order to achieve the above object, the present invention provides a bit error measuring apparatus for receiving data of a WLL terminal system including a transmitter and a receiver, wherein the transmitter passes the transmission data output from the modulator according to the test control signal of the controller. A first mux for selectively outputting whether or not to execute a test mode, a pattern generator for generating a specific pattern signal for encoding when the test mode of the first mux is set, and transmission data output from the first mux. A channel encoder for channel encoding and outputting the transmission symbol data;

The receiver includes a channel decoder for decoding the demodulated received symbol data into an original signal, a pattern generator for generating the same pattern signal as the pattern signal generated by the pattern generator of the transmitter, and the received data detected at a rear end of the channel decoder. Or a second mux for selectively muxing the output data of the channel decoder and the pattern signal of the pattern generator according to the test control signal of the controller, and encoding the received data output from the second mux in the same manner as the channel encoder of the transmitter. A first comparator for comparing bit symbol at the front end of the channel decoder by comparing the channel encoder with the received symbol data of the input terminal of the channel decoder and the re-encoding symbol data of the channel encoder, and the received data and pattern generator of the output terminal of the channel decoder. A second error that detects a bit error at a rear end of the channel decoder by comparing the pattern signal of The present invention provides a bit error measuring apparatus for a channel encoder / decoder of a WLL terminal system, comprising a comparator.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing explaining the bit error measuring apparatus of the encoder / decoder of the conventional WLL terminal system.

2 is an explanatory diagram for explaining a bit error measuring apparatus of a decoder / decoder of a WLL terminal system according to the present invention;

<Detailed Description of Codes>

1: WLL terminal 2: modem

3: transmitter 4: receiver

5 controller 6 modulator

7: first mux 8: pattern generator

9: channel encoder 10: channel decoder

11: pattern generator 12: second mux

13: channel encoder 14: first comparator

15: second comparator 16: voice signal processing unit

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

The apparatus of the present invention is provided in the modem 2 of the WLL terminal 1, as shown in FIG. 2, from a transmitter 3 for encoding transmission data and from a transmitter 3 of the other WLL terminal 1. Receiving unit (4) for receiving the transmitted channel data to measure the bit error, and generates a test control signal for the bit error measurement of the receiving unit 4 and the transmitter (3) and the overall function of the WLL terminal (1) It consists of the control part 5 to control.

At this time, the transmission unit 3 and the first mux 7 for selectively outputting whether or not to pass the transmission data output from the modulation unit 6 in accordance with the test control signal of the control unit 5 or to execute the test mode; And a pattern generator 8 for generating a pattern signal such as "511" for encoding when the test mode of the first mux 7 is set, and the transmission data output from the first mux 7. And a channel encoder (9) for channel coding and outputting the transmission symbol data.

The receiver 4 generates a channel signal identical to the pattern signal generated by the channel decoder 10 and the pattern generator 8 of the transmitter 3 to decode the demodulated received symbol data into the original signal. The pattern generator 11 and the received data detected at the output terminal of the channel decoder 10 or the output data of the channel decoder 10 and the pattern signal of the pattern generator 11 according to the test control signal of the controller 5. A second mux 12 for selectively muxing, a channel encoder 13 for encoding the received data output from the second mux 12 in the same manner as the channel encoder 9 of the transmitter 3, and the channel A first comparator 14 for detecting a bit error at the front end of the channel decoder 10 by comparing the received symbol data of the input terminal of the decoder 10 with the recoded symbol data of the channel encoder 13, and the channel decoder 10 Received data at the output terminal of the Comparing the signal to a second comparator 15 for detecting a bit error at the rear end of the channel decoder (10).

Here, a voice signal processor 16 for processing a voice signal is connected to an input terminal of the modulator 6, and a demodulator 17 is connected to an input terminal of the channel decoder 10 of the receiver 4. An RF unit 18 is connected to one end of the channel encoder 9 and the demodulator 17 of the transmitter 3.

Next, the operation and effects of the present invention as described above will be described.

First, when the user of the WLL terminal 1 forms a call in the usual manner, the control unit 5 of the WLL terminal 1 is the first mux 7 of the transmitter 3 and the second mux of the receiver 4. The test mode enable signal is not applied to the selection terminal (12). At this time, when the user inputs the other party's telephone number through the key panel unit 19 for the telephone call, the controller 5 recognizes this and executes a normal call function.

For example, the WLL terminal 1 receives a channel assignment through the WSC 20, and when a user's voice signal is input, the voice signal processor 16 processes the voice signal to the modulator 6 of the modem 2. Enter it. Then, the modulator 6 of the modem 2 modulates the input transmission data and outputs the modulated data to the first mux 7 of the measuring apparatus of the present invention. In this case, the first mux 7 includes a control part 5. Since the test control signal has not been set, only the transmission data of the modulator 6 is outputted to the channel encoder 9. Therefore, the channel encoder 9 encodes the input transmission data and outputs the encoded data to the RF unit 18. The RF unit 18 RF-processes the input transmission symbol data to the counterpart WLL terminal (not shown) in which the current call is formed according to the call control signal of the WSC 20.

Then, the RF unit 18 of the counterpart WLL terminal which has received the transmission symbol data receives an RF signal of the currently received symbol data and inputs it to the demodulator 17. The demodulator 17 demodulates the received reception symbol data and inputs it to the channel decoder 10 of the receiver 4. Then, the channel decoder 10 decodes the received received symbol data into an original signal and outputs the received signal to the voice signal processor 16 and the second mux 12. At this time, since the test control signal is not set from the controller 5 in the second mux 12, only the received data of the channel decoder 10 is outputted to the channel encoder 13. Then, the channel encoder 13 re-symbolizes the received data again and inputs the received data to the first comparator 14. Accordingly, the first comparator 14 compares the received re-coded received data with the received symbol data detected at the front end of the channel decoder 10 and inputs the resultant signal to the controller 5, wherein the controller (5) recognizes that there is a bit error in the received data of the front end of the channel decoder 10 when the result signal output from the first comparator 14 has a constant value.

At the same time as the above process, the second comparator 15 compares the received data detected at the rear end of the channel decoder 10 with the pattern signal generated from the pattern generator 11 and inputs the result signal to the controller 5. In this case, when the result signal output from the second comparator 15 has a predetermined value, the controller 5 recognizes that there is a bit error in the received data at the rear end of the channel decoder 10.

On the other hand, if it is determined that the channel reception state is poor and the reliability of the received data is suspected during the above process, the user performs bit error testing like the other WLL terminal 1, where each WLL terminal 1 ), A test function is set through the key panel unit 19. Then, the control unit 5 of each WLL terminal 1 recognizes the test function setting signal and applies a test enable signal to the selected terminals of the first mux 7 and the second mux 12. When the transmission data is input from the modulator 6 to the first mux 7, the first mux 7 receives the transmission data of the modulator 6 and the pattern signal generated from the pattern generator 8, for example. A specific pattern signal such as " 511 " is muxed and outputted to the channel encoder 9. Then, the channel encoder 9 encodes the transmission data including the input specific pattern signal and outputs the encoded data to the RF unit 18. In addition, the RF unit 18 processes the inputted transmission symbol data into an RF signal and transmits the received signal to a counterpart WLL terminal (not shown) in which a current call is formed according to the call control signal of the WSC 20.

Then, the RF unit 18 of the counterpart WLL terminal which has received the transmission symbol data receives an RF signal of the currently received symbol data and inputs it to the demodulator 17. The demodulator 17 demodulates the received reception symbol data and inputs it to the channel decoder 10 of the receiver 4. Then, the channel decoder 10 decodes the received received symbol data into an original signal and outputs the received signal to the voice signal processor 16 and the second mux 12. At this time, since the test control signal is set from the control unit 5 in the second mux 12, the second mux 12 may receive the received data of the channel decoder 10 and the pattern signal generated from the pattern generator 8, for example. A specific pattern signal such as " 511 " is muxed and outputted to the channel encoder 9. Then, the channel encoder 9 re-symbolizes the received data including the input pattern signal and inputs it to the first comparator 14. Accordingly, the first comparator 14 compares the received re-coded received data with the received symbol data detected at the front end of the channel decoder 10 and inputs the resultant signal to the controller 5, wherein the controller (5) recognizes that there is a bit error in the received data of the front end of the channel decoder 10 when the result signal output from the first comparator 14 has a constant value.

At the same time as the above process, the second comparator 15 compares the received data detected at the rear end of the channel decoder 10 with the pattern signal generated from the pattern generator 13 and inputs the resultant signal to the controller 5. In this case, when the result signal output from the second comparator 15 has a predetermined value, the controller 5 recognizes that there is a bit error in the received data at the rear end of the channel decoder 10.

Therefore, in the related art, the reliability of the bit error measurement result on the received data executed in a state in which the channel state is poor and the signal to noise ratio is poor is often doubted. When the error is measured, a specific pattern is transmitted in the transmission data, and the transmitted data is detected separately at the front and rear ends of the channel decoder, so that the bit error for the channel signal is more accurate than that otherwise. Can be measured.

Here, in another embodiment of the present invention, the pattern generator 8 of the transmitter 3 and the pattern generator 13 of the receiver 4 are integrated, and when the transmitter 3 is operated, the pattern generation function of the receiver 4 is performed. On the other hand, when the receiver 4 is operated, the pattern generation function of the transmitter 3 is stopped so that all the pattern signals may be generated during the transmission / reception function with one pattern generator.

As described above, the present invention includes a means for switching the signal of the pattern generator on the transmitting side of the WLL modem and a plurality of means for measuring the bit error of the transmission data in front and rear of the channel decoder on the receiving side. By measuring the error, even if the reception state of the WLL channel signal is poor, the bit error of the received channel signal can be accurately detected, which has the advantage of improving the reliability of the bit error measurement.

In addition, according to the present invention, since the bit error of the channel signal is measured at the front and rear ends of the channel decoder on the modem receiving side, the accuracy of the bit error determination can be secured accordingly.

Claims (2)

In the bit error measurement apparatus of the received data of the WLL terminal system provided with a transmitter and a receiver, The transmitter may include a first mux for selectively outputting the transmission data output from the modulator according to a test control signal of the controller or executing a test mode, and for encoding when the test mode of the first mux is set. A pattern generator for generating a specific pattern signal, and a channel encoder for channel coding the transmission data output from the first mux and outputting the transmission symbol data as transmission symbol data; The receiver includes a channel decoder for decoding the demodulated received symbol data into an original signal, a pattern generator for generating the same pattern signal as the pattern signal generated by the pattern generator of the transmitter, and the received data detected at a rear end of the channel decoder. Or a second mux for selectively muxing the output data of the channel decoder and the pattern signal of the pattern generator according to the test control signal of the controller, and encoding the received data output from the second mux in the same manner as the channel encoder of the transmitter. A first comparator for comparing bit symbol at the front end of the channel decoder by comparing the channel encoder with the received symbol data of the input terminal of the channel decoder and the re-encoding symbol data of the channel encoder, and the received data and pattern generator of the output terminal of the channel decoder. A second error that detects a bit error at a rear end of the channel decoder by comparing the pattern signal of A bit error measuring apparatus for a channel encoder / decoder of a WLL terminal system, comprising: a comparator. The apparatus of claim 1, wherein the channel generator / decoder of the WLL terminal system is provided with a pattern generator integrating the pattern generator of the transmitter and the pattern generator of the receiver.