KR20010097106A - Modulator in imt-2000 base station - Google Patents

Abstract

The present invention relates to a modulator of an IMT-2000 base station including an option for performing modulation in a mobile station mode in a modulator of an IMT-2000 base station. The present invention is a two-phase shift in phase of data output from an spreader. A two-phase shifting modulator for modulating, a switching switch installed outside the modulator and used to switch to a desired mode, and selection for selecting phase shifted data in a mode switched according to the switching of the switching switch And a loop connector which receives only the baseband from the baseband filter and transmits the baseband to the demodulator.

Description

Modulator in IMT-2000 Base Station

The present invention relates to a modulator of an International Mobile Telecommunication (IMT) -2000 base station, and more particularly, to an IMT-2000 base station including an option for performing modulation in a mobile station mode in a modulator of an IMT-2000 base station. Of modulators.

In general, IMT-2000, the next generation mobile communication, is a system that can provide all possible mobile communication services by integrating various mobile communication networks and services formed to provide various types of existing services into one, and various forms. It aims to provide a comprehensive mobile communication service to subscribers by having the ability to cope with multi-service and multi-environment using wireless access and large capacity of subscribers. In addition, in terms of services, it aims to provide multimedia communication and international roaming services such as data and video having a transmission rate of up to 2 Mbps, and an integrated network based on ATM networks.

1 is a diagram illustrating a modulator block configuration of a general IMT-2000 base station.

As shown in FIG. 1, a modulator of a general IMT-2000 base station is an encoder 10 for encoding input data (synchronous channel data, call channel data, and forward call channel data, etc.), and coded by the encoder 10. Interleaver 12 for rearranging data for error correction of data, Spreader 14 for band-extending the data output from the interleaver 12, and phase of data band-extended and output from the spreader 14 Complex Quadrature Phase-Shift Keying (CQPSK) 16 for modulating the gain, and a gain adjusting unit 18 for multiplying the data modulated by the complex Four-Phase Shift Keying unit 16 by a certain gain to adjust gain. ), A data summing unit 20 for summing up all the gain-adjusted data output from the gain adjusting unit 18 and only the baseband in the summing and outputting data from the data summing unit 20. The excess is composed of a baseband filter 22.

The operation of the modulator of the IMT-2000 base station configured as described above is as follows.

First, a plurality of input data, such as sync channel data, call channel data, forward call channel data, etc., are input to the encoder 10 and encoded as "0" or "1".

The coded data is rearranged for error correction in interleaver 12 and banded in spreader 14.

Data spread out by the spreader 14 is output to the Complex Quadrature Phase-Shift Keying (CQPSK) 16 and is applied to (0,0) and π / 2 (0). 0,1), (1,0) on π, (1,1) on 3π / 2 and then modulated.

Subsequently, the data modulated by the complex four-phase shift modulator 16 is output to the gain adjusting unit 18.

The complex four-phase modulation data applied to the gain adjusting unit 18 is multiplied by a predetermined gain, and the multiplied data is output to the data summing unit 20.

In addition, the data applied to the data summing unit 20 is summed and output to the baseband filter 22.

In the baseband filter 22, only the baseband of the data output from the data summing unit 20 passes.

However, there is a problem that expensive simulator equipment is used to test the modulator of the IMT-2000 base station operated as described above.

In addition, for step-by-step debugging and testing before expanding the test area for the RF (Radio Frequency) and IF (Intermediate Frequency) areas, including the mobile station, the modulator itself or the modulation period digital area can be used. There was a problem requiring a function or device for testing.

Accordingly, an object of the present invention is to provide a demodulator by adding a two-phase shifting modulator, a selector, and a switching switch to a modulator of an IMT-2000 base station. It provides a modulator of an IMT-2000 base station that can switch to mobile station mode to test the demodulator when testing is needed.

A feature of the modulator of the IMT-2000 base station according to the present invention for achieving the above object is an IMT-2000 equipped with an encoder, an interleaver, a spreader, a complex four-phase shifter, a gain adjuster, a data adder, and a baseband filter. A modulator of a base station, comprising: a two-phase shift modulator for modulating a phase of data that is extended from the spreader and outputted by a two-phase shifter, and is provided outside the modulator to switch to a desired mode (base station mode or mobile station mode). And a selection unit for selecting phase-modulated data in a mode switched according to the switching of the switching switch, and a loop connector for transmitting only a baseband from the baseband filter to a demodulator. do.

1 is a block diagram illustrating a modulator block configuration of a general IMT-2000 base station;

2 is a diagram illustrating a modulator block configuration of an IMT-2000 base station according to the present invention.

<Explanation of symbols for the main parts of the drawings>

40: encoder, 42: interleaver,

44: spreader, 46: four-phase shift modulator,

48: two phase shift modulator, 50: changeover switch,

52: selector, 54: gain adjuster,

56: data summing unit, 58: baseband filter,

60: Loop connector.

Hereinafter, a preferred embodiment of a modulator of an IMT-2000 base station according to the present invention will be described with reference to the accompanying drawings.

2 is a block diagram illustrating a modulator of an IMT-2000 base station according to the present invention.

As shown in FIG. 2, an encoder 40 for encoding input data (synchronization channel data, call channel data, forward call channel data, etc.) and the data for error correction of the data encoded by the encoder 40 are provided. An interleaver 42 for rearranging, a spreader 44 for band-extending the data output from the interleaver 42, and a complex four-phase shift for modulating the phase of the data band-extended and output from the spreader 44. Complex Quadrature Phase-Shift Keying (CQPSK) 46 and Binary Phase-Shift Keying (BPSK) for modulating the phase of data that is band-extended from the spreader 44 and output. ), A switching switch 50 installed outside the modulator and used when a user wants to switch to a desired mode, that is, a base station mode or a mobile station mode, and a switch switched according to the switching of the changeover switch 50. A selection unit 52 for selecting data output from the complex four-phase shifting modulator 46 or the two-phase shifting modulation unit 48 (base station mode, mobile station mode), and data modulated by the selection unit 52; A gain adjusting section 54 for multiplying the gain by a predetermined gain to adjust the gain, a data adding section 56 for adding up the gain-adjusted data output from the gain adjusting section 54, and a sum output from the data adding section 56; The baseband filter unit 58 passes only the baseband in the data, and the loop connector 60 transmits the baseband data output from the baseband filter unit 58 to a demodulator (not shown).

The modulator operation of the IMT-2000 base station according to the present invention configured as described above will be described.

First, a plurality of input data, synchronous channel data, call channel data, forward call channel data, and the like are inputted to the encoder 40 and encoded as "0" or "1".

The coded data is rearranged for error correction in the interleaver 42 and the data band widened in the spreader 44.

The data spread out by the spreader 44 is output to the Complex Quadrature Phase-Shift Keying (CQPSK) 16 and is applied to (0,0) and π / 2 (0). 0,1), (1,0) on π, (1,1) on 3π / 2 and then modulated.

In addition, the data band-extended from the spreader 44 is output to a binary phase-shift keying (BPSK) 48, and a specific frequency is assigned to 1 and 0, respectively, and modulated.

On the other hand, when the user needs to test the demodulator, the user controls the selector 52 by switching the changeover switch 50.

For example, when the changeover switch 50 is pressed once, the mobile station mode is switched so that the selector 52 converts the two-phase shifted data outputted from the two-phase shift modulator 48 to the gain adjuster 54. Is output.

When the changeover switch 50 is pressed again, the switching unit 50 switches to the base station station mode so that the selector 52 transfers the 4-phase shift-modulated data output from the combined 4-phase shifter 48 to the gain adjuster 54. Is output.

The two-phase modulated data / composite four-phase modulated data applied to the gain adjusting section 54 is multiplied by a predetermined gain, and the multiplied data is output to the data summing section 56.

In addition, all data applied to the data summing unit 56 are summed and then output to the baseband filter 58.

In the baseband filter 58, only the baseband of the data output from the data summing unit 56 passes.

The baseband data passed from the baseband filter unit 58 is transmitted to a demodulator connected to the loop connector 60.

Therefore, the present invention controls the selector to select the two-phase shift modulation output by using a switch outside the modulator for the test in the mobile station mode, and then modulates the two-phase shift modulation and outputs the data to the gain adjuster. The data output to the gain adjusting unit is output to a demodulator through a baseband filter and a loop connector.

As described above, the present invention provides a loop connector for a loop between a switching switch and a demodulator outside the modulator of the IMT-2000 base station, as well as providing a selector and a two phase shift modulator inside the modulator of the IMT-2000 base station. There is an advantage that the modulation can be performed in the mobile station mode by providing a.

Therefore, by performing the modulator function of the mobile station mode, it is possible to verify the function of the base station demodulator irrespective of the RF region.

In addition, there is no need for a separate board or instrument to verify the functionality of the demodulator.

In addition, as a technology for generating a signal of a virtual mobile station for testing and verifying the modulator for IMT-2000, it can be used in many systems in the future.

In particular, the data output to the gain adjusting unit is directly output to the demodulator through the baseband filter and the loop connector, so that the function of the demodulator not passing through the IF, RF, and mobile stations can be tested first.

Claims (1)

In the modulator of an IMT-2000 base station having an encoder, an interleaver, a spreader, a complex four-phase shifter, a gain adjuster, a data adder and a baseband filter, A two phase shift modulator for shifting the phase of data output from the spreader and shifting the phase of the data; A switching switch installed outside the modulator and used when a user wants to switch to a desired mode (base station mode, mobile station mode); A selection unit for selecting phase shifted data in a mode switched according to the switching of the changeover switch; And a loop connector configured to receive only the baseband from the baseband filter and transmit the received baseband to a demodulator.