KR20010063686A - Apparatus for controlling local test of CDMA channel element - Google Patents

Abstract

PURPOSE: A local test control device of a CDMA(Code Division Multi Access) channel element is provided to perform a test as a local without using a counter. CONSTITUTION: A pattern generator(21) generates a test pattern. An encoder (22) encodes data of the pattern generator(21). The first and the second I/Q channel PN(Pseudo Noise) code generator(24-27) generate PN codes of I/Q channels. A processor(28) controls selections of the PN codes. The first and the second PN code selector(29,30) respectively select the PN codes according to control of the processor(28). A serial/parallel converter(31) separates an output of the encoder(22) into the I/Q channels. A symbol repeater(32) adjusts an output of the serial/parallel converter(31) as a demodulation symbol rate. The first and the second digital gain unit(35,38) combine the each selected PN code with a call channel output, or pilot channels, and supply digital gains to signals performed a spread spectrum. A combiner(39) receives an output of the first and second digital gain unit(35,38), and combines outputs of the call channels and the pilot channels. A multiplexor/interface(40) multiplexes/interfaces an output of the combiner(39), and converts the output to be matched to a receiving signal of a receiver. A demodulator(41) demodulates an output of the multiplexor/interface(40). A pattern detector(42) detects a pattern from an output of the demodulator(41), and detects an extraction data of the receiver to confirm the data.

Description

Apparatus for controlling local test of CDMA channel element}

The present invention relates to a local test control apparatus for a code division multiple access (CDMA) channel element, and in particular, does not use an instrument when testing a channel element in a W-CDMA wireless local loop (WLL). A local test control device for a CDMA channel element that is suitable for testing locally.

In general, a WLL system using a code division multiple access (CDMA) wireless access standard can be divided into an N-CDMA (Narrowband-CDMA) (IS-95) method and a W-CDMA (Wideband-CDMA) method. Compared to the N-CDMA scheme, the W-CDMA scheme has a difference in frequency bandwidth, voice bandwidth data rate, and whether ISDN BRI (2B + D) service can be provided.

In addition, the wireless subscriber network system is a system that replaces a predetermined interval between each subscriber's home and the public switched telephone by wireless instead of wires in the existing Public Switching Telephone Network (PSTN) system. Responsible for connection and disconnection of a bearer by a mobile terminal (MT) that receives a user's signal from a telephone (TE) in a home and transmits the signal to a base station, and the subscriber wireless access device (RIU) wirelessly. A base station controller (BS), a base station controller (BSC) that performs a function of connecting a call link between the switch and the base station, and an existing public line switching network (PSTN); It consists of a mobile subscriber line network switch (MSC) that is responsible for link establishment of a call.

Therefore, the wireless subscriber network can easily install the telephone network than the existing wired network system, the cost of facility expansion is low, and the flexibility of the network design according to the increase of subscribers has the advantage.

In addition, unlike conventional narrowband CDMA networks, W-CDMA wireless subscriber systems enable the implementation of integrated services digital network (ISDN) services and packet networks as well as call, fax and data transmission. .

According to the ongoing specification (IS-707-A.7) for analog fax service in the WLL system, when a user of an analog fax machine wants to send a fax, BS / MSC detects a fax tone (V.21 preamble) and negotiates service. Service Negotiation is the transition from voice to fax service options.

1 is a block diagram of a test apparatus for a conventional CDMA channel element.

As shown therein, reference numeral 1 denotes a measuring instrument that performs a test of a CDMA channel element through a call channel data unit, 2 denotes a call channel data unit that receives a signal from a demodulation unit 19 and sends out data. A coder for encoding the data output from the call channel data part 2, 4 is a symbol puncturing part for outputting the code part 3, and 5 is a serial of the symbol puncturing part 4; Serial / parallel conversion unit for converting data into parallel data and separating them into I and Q channels.

Also, reference numeral 6 denotes a pawn repeater for matching serial data of the serial / parallel conversion unit 5 to a modulation symbol rate, and 7, 8, 12, and 13 denote a spread spectrum or a symbol for '0'. I / Q channel PN code generator for generating PN codes of I and Q channels for spread spectrum, 9, 10, 14, and 15 are multipliers for multiplying PN codes and input signals, and 11 and 16 are bands. It is a digital gain unit that provides a digital gain of a spread signal.

In addition, reference numeral 17 is a coupling unit for coupling the outputs of the digital gain units 11 and 16 in the call channel and the pilot channel, and 18 is a base station in the terminal station after receiving and measuring the signal of the coupling unit 17. It is a measuring instrument or terminal for obtaining code synchronization and carrier phase information of a signal, and 19 is a demodulating portion 19 for demodulating the output of the measuring instrument or terminal 18 and inputting it to the call channel data portion 2.

The operation of the conventional apparatus configured as described above is as follows.

First, if there is data to be sent to the call channel from the call channel data section 2, the data is sent to the code section 3. At this time, the data input to the coder 3 is 8Kbps, 16Kbps, 32Kbps, 64Kbps, 144Kbps, and the coder 3 encodes the code rate (r) = 1/2 and the constraint length (k) = 9 It is encoded by a convolutional encoder and sent to the symbol puncturing unit 4 at 16 Kbps, 32 Kbps, 64 Kbps, 128 Kbps, and 288 Kbps.

A symbol coded at 288 Kbps in the symbol puncturing unit 4 is converted to 256 Kbps and then sent to the serial / parallel conversion unit 5 for separating into I and Q channels, and this output is sent to the symbol repetition unit 6.

In the symbol repetition unit 6, the input data is repeatedly set to a symbol rate in order to convert at a rate of 64 Kbps, 128 Kbps, and 256 Kbps according to the modulation symbol rate.

The symbol data from the symbol repeater 6 is spread to the digital gain unit 11 by multiplying with the signals from the I and Q channel PN code generators 7 and 8 to spread the spectrum.

The digital gain unit 11 gives the digital gain to the spread spectrum signal and sends it to the combiner unit 17.

On the other hand, the pilot channel is multiplied by the signal from the I, Q channel PN code generators 12 and 13 for spread spectrum to the symbol of '0' and sent to the digital gain unit 16.

The digital gain unit 16 gives a digital gain to the spread spectrum signal and sends it to the combiner unit 17.

The combiner 17 combines and outputs output data of the pilot channel and the call channel.

The output signal is checked with a measuring instrument or a terminal, and the receiver is checked with a receiving instrument using the terminal.

However, this conventional technique is complicated because the output signal of the transmitter to check the signal with a measuring instrument or a terminal, and there is an inconvenient problem because the measuring instrument must be used even when testing the receiver.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to control a local test of a CDMA channel element that can be tested locally without using an instrument when testing a channel element in a W-CDMA WLL. To provide a device.

In order to achieve the above object, the local test control apparatus for a CDMA channel element according to an embodiment of the present invention,

A pattern generator for generating a test pattern; A coder for encoding data of the pattern generator; First and second I / Q channel PN code generators generating PN codes of I and Q channels for spreading the call channel and the pilot channel; A processor unit controlling PN code selection; First and second PN code selectors configured to select PN codes of the first and second I / Q channel PN code generators under control of the processor unit; A serial / parallel converter for separating the output of the code part into I and Q channels; A symbol repeater for matching the output of the serial / parallel converter to a modulation symbol rate; First and second digital gain units combining the PN codes selected by the first and second PN code selectors and the call channel output or pilot channel of the symbol repeater, respectively, to give a digital spread to a spread signal; A combiner configured to receive outputs of the first and second digital gain units and combine outputs of a call channel and a pilot channel; A multiplexer / matcher for multiplexing and matching outputs of the combiner and converting the matched signal to a receiver signal; A demodulation section for demodulating the output of the multiplexing / matching section; The technical configuration is characterized in that it consists of a pattern detector for detecting and confirming the extracted data of the receiver by detecting the pattern at the output of the demodulator.

1 is a block diagram of a test apparatus for a conventional CDMA channel element;

2 is a block diagram of a local test control apparatus for a CDMA channel element according to an embodiment of the present invention;

3 is a detailed block diagram of a pattern generator in FIG. 2;

FIG. 4 is a detailed block diagram of the pattern detector of FIG. 2.

Explanation of symbols on the main parts of the drawings

21: pattern generator 22: code

23: symbol puncturing unit 24: the first I channel PN code generation unit

25: second I channel PN code generator 26: first Q channel PN code generator

27: second Q channel PN code generation unit 28: processor unit

29: first PN code selector 30: second PN code selector

31: serial / parallel conversion unit 32: symbol repeating unit

33: first multiplier 34: second multiplier

35: first digital gain unit 36: third multiplier

37: fourth multiplier 38: second digital gain unit

39: coupling unit 40: multiplexing / matching unit

41: demodulator 42: pattern detector

Hereinafter, an embodiment according to the technical spirit of the local test control apparatus of the present invention CDMA channel element as described above is as follows.

2 is a block diagram of a local test control apparatus for a CDMA channel element according to an embodiment of the present invention.

As shown therein, a pattern generator 21 for generating a test pattern; An encoder (22) for encoding the data of the pattern generator (21); First and second I / Q channel PN code generators 24 to 27 for generating PN codes of I and Q channels for spreading the call channel and the pilot channel; A processor unit 28 for controlling PN code selection; First and second PN code selectors (29) (30) for selecting PN codes of the first and second I / Q channel PN code generators under control of the processor (28); A serial / parallel converter (31) for separating the output of the code part (22) into I and Q channels; A symbol repeater (32) for matching the output of the serial / parallel converter (31) to a modulation symbol rate; A PN code selected by the first and second PN code selectors 29 and 30, respectively, and a call channel output or pilot channel of the symbol repeater 32, respectively, to provide a digital gain to a spread spectrum signal. First and second digital gains 35, 38; A combiner 39 which receives the outputs of the first and second digital gain units 35 and 38 and combines the outputs of the call channel and the pilot channel; A multiplexing / matching unit 40 for multiplexing and matching outputs of the combining unit 39 and converting the matching unit 39 according to a reception signal of the receiver; A demodulator (41) for demodulating the output of the multiplexer / matcher (40); The pattern detecting unit 42 detects the pattern at the output of the demodulator 41 and detects and confirms the extracted data of the receiver.

Here, reference numeral 23 denotes a symbol puncturing unit which receives the output of the coder and symbol punctures the input to the serial / parallel converter 31, and 33, 34, 36, and 37 are multipliers.

FIG. 3 is a detailed block diagram of the pattern generator of FIG. 2.

As shown therein, first to fifth flip-flops 51 to 55 for sequentially shifting data of the combination unit 56 according to a clock; A combiner 56 receiving the output values of the second and fifth flip-flops 52 and 55 and transmitting new output values as initial input values of the first flip-flop 51; The output unit 57 receives the value of the combination unit 56 and generates an output value having a pattern of a certain period.

FIG. 4 is a detailed block diagram of the pattern detector of FIG. 2.

As shown therein, first to fifth flip-flops 61 to 65 for sequentially shifting input data according to a clock; A comparator 66 which receives the output values of the second and fifth flip-flops 62 and 65 and compares them with the initial input values of the first flip-flop 61; The error detection unit 67 detects an error using a value output from the comparison unit 66.

The operation of the local test control apparatus for the CDMA channel element according to the present invention configured as described above will be described in detail with reference to the accompanying drawings.

First, in the call channel, the data generated by the pattern generator 21 is sent to the coder 22. At this time, the data inputted to the coder 22 is 8Kbps, 16Kbps, 32Kbps, 64Kbps, 144Kbps, the coder 22 is code rate (r) = 1/2, constraint length (k) = 9 It is encoded by a convolutional encoder and sent to the symbol puncturing unit 23 at 16Kbps, 32Kbps, 64Kbps, 128Kbps, and 288Kbps rates.

A symbol coded at 288 Kbps in the symbol puncturing unit 23 is converted to 256 Kbps and then sent to the serial / parallel conversion unit 31 for separating into I and Q channels, and this output is sent to the symbol repeating unit 32.

The symbol repeater 32 repeats the input data at the symbol rate in order to convert the 64Kbps, 128Kbps, and 256Kbps rates according to the modulation symbol rate.

In the case of such a call channel, there is a first I-channel PN code generator 24 and a first Q-channel PN code generator 26 for spreading the bandwidth, and the generated PN code is transferred to the first PN code selector 29. Is sent. The first PN code selector 29 is controlled by the processor 28 so that one of the first I-channel PN code generator 24 or the first Q-channel PN code generator 26 may be adapted to the algorithm of the receiver. Only the code is sent to the I and Q channels equally and multiplied by the output of the symbol repeater 32.

The first digital gain unit 35 gives a digital gain to the spread spectrum signal and sends it to the combiner 39.

On the other hand, the pilot channel transmits a signal from the second I and Q channel PN code generators 25 and 27 for spread spectrum to a symbol of '0' to the second PN code selector 30 and the second PN code. The selector 30 may control only one code of the second I-channel PN code generator 25 or the second Q-channel PN code generator 27 under I / Q to match the algorithm of the receiver under the control of the processor 28. The same is sent to the channel to give the digital gain from the second digital gain section 38 and to the combiner section 39.

The combiner 39 combines and outputs output data of the pilot channel and the call channel.

Here, the quaternary spreading of the forward channel uses two different forward I channel sequences and a forward Q channel sequence. Both sequences are shortened sequences using only 20 ms of length 2 ²³ -1 length PN sequences.

Generation of Forward I-Channel Sequence Polynomial PI (X) and Generation of Forward Q-Channel Sequence Polynomial PQ (X) is represented by Equations 1 and 2 below.

PI (X) = X ³² + X ²² + X ² + 1

PQ (X) = X ³² + X ³⁴ + X ³⁰ + X ¹⁰ + 1

The output of the combiner is returned to the receiver. At this time, since the output rate and the number of bits of the transmitter are different, there is a multiplexing / matching unit 40 to match this.

The signal output from the multiplexer / matching unit 40 and input to the receiver is restored to the original data by the demodulation unit 41 and sent to the pattern detection unit 42 to confirm the data.

Therefore, the error detection unit 67 in the pattern detection unit 42 detects the data having a certain period generated in the pattern generation unit 21 and is changed or lost during the transmission to test the channel element.

As such, the present invention is to test locally in a W-CDMA WLL without using an instrument when testing a channel element.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the local test control apparatus of the CDMA channel element according to the present invention can test locally without using an instrument when performing a test, thereby simplifying the test and improving the test check efficiency. .

Claims (3)

A pattern generator for generating a test pattern; A coder for encoding data of the pattern generator; First and second I / Q channel PN code generators generating PN codes of I and Q channels for spreading the call channel and the pilot channel; A processor unit controlling PN code selection; First and second PN code selectors configured to select PN codes of the first and second I / Q channel PN code generators under control of the processor unit; A serial / parallel converter for separating the output of the code part into I and Q channels; A symbol repeater for matching the output of the serial / parallel converter to a modulation symbol rate; First and second digital gain units combining the PN codes selected by the first and second PN code selectors and the call channel output or pilot channel of the symbol repeater, respectively, to give a digital spread to a spread signal; A combiner configured to receive outputs of the first and second digital gain units and combine outputs of a call channel and a pilot channel; A multiplexer / matcher for multiplexing and matching outputs of the combiner and converting the matched signal to a receiver signal; A demodulation section for demodulating the output of the multiplexing / matching section; And a pattern detector for detecting and confirming extracted data of a receiver by detecting a pattern at an output of the demodulator. The method of claim 1, wherein the pattern generator, First to fifth flip-flops for sequentially shifting data of the combination unit in accordance with a clock; A combiner configured to receive output values of the second and fifth flip-flops and transmit new output values as initial input values of the first flip-flop; And an output unit configured to receive the value of the combination unit and generate an output value having a pattern of a predetermined period. The method of claim 1, wherein the pattern detection unit, First to fifth flip-flops that sequentially shift the input data according to a clock; A comparator which receives the output values of the second and fifth flip-flops and compares them with the initial input values of the first flip-flop; And an error detection unit for detecting an error using a value output from the comparison unit.