KR100597867B1 - Receiver in mobile communication - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a receiving apparatus in a mobile communication system.

2. The problem to be solved by the invention

An object of the present invention is to provide a receiving device that can obtain a stable transmission and reception gain in a mobile communication environment by adding a frequency component appropriately shifted in a digital mobile communication system.

3. Summary of Solution to Invention

The present invention comprises: first and second reception processing means for receiving a high frequency signal to compensate and amplify gain; Shift frequency generating means for generating shift frequency; First intermediate frequency converting means for converting a high frequency signal transmitted from the first receiving processing means into a first intermediate frequency signal; Second intermediate frequency converting means for converting the high frequency signal transmitted from the second receiving processing means into a second intermediate frequency signal; And converting and demodulating means for converting the first intermediate frequency signal and the second intermediate frequency signal into a baseband signal and demodulating the original signal.

4. Important uses of the invention

The present invention is used in a digital mobile communication system.

Mobile communication system, code division multiple access, digital method, intermediate frequency, receiver

Description

RECEIVER IN MOBILE COMMUNICATION SYSTEM {RECEIVER IN MOBILE COMMUNICATION}

1 is a block diagram of a receiving apparatus in a conventional mobile communication system.

2 is an explanatory diagram of the conventional receiving device of FIG.

3 is a block diagram of an embodiment of a receiving apparatus in a mobile communication system according to the present invention;

4 is an explanatory diagram of a receiving apparatus in a mobile communication system according to the present invention;

5 is an exemplary diagram illustrating a period of a shift frequency generated from the shift frequency generator of FIG. 3.

Explanation of symbols on the main parts of the drawings

311 and 312: first and second reception preprocessors

313 and 314: first and second reception amplifiers

315: shift frequency generator

316, 317: first and second intermediate frequency converter

318: transformation and demodulation

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving apparatus in a mobile communication system, and more particularly to a receiving apparatus for adding a shift frequency component to a received signal in a digital communication system such as a code division multiple access (CDMA) system. .

1 is a block diagram of a receiving apparatus in a conventional mobile communication system, and includes first and second reception preprocessors 111 and 112, first and second reception amplifiers 113 and 114, and first and second receivers. The second intermediate frequency converters 115 and 116 and the converter and demodulator 117 are configured.

FIG. 2 is an explanatory diagram of the conventional receiving apparatus of FIG. 1. Referring to this, the operation of the conventional receiving apparatus having the structure as described above will be described below.

When the transmitting end of the mobile station emits a high frequency signal modulated and converted in a contracted manner with the receiving end of the base station to the space through the transmitting antenna, the radiated radio waves are transmitted to the receiving apparatus in the base station through multiple propagation paths.

In this way, the received signal transmitted to the base station is amplified by the first and second reception amplifiers 113 and 114 via the first and second reception preprocessors 111 and 112, and then the first and second intermediate frequencies. It is transmitted to the conversion unit (115, 116).

Subsequently, when the intermediate frequency converters 115 and 116 respectively convert the high frequency signals transmitted to the intermediate frequencies and transmit the intermediate frequency signals to the transform and demodulator 117, the transform and demodulator 117 transmits the transmitted intermediate frequency signals. Convert to demodulated baseband signal. In this case, the intermediate frequency uses the same frequency or fixed frequency for each of multiple reception paths.

Accordingly, a pattern synthesizing effect occurs between the antennas 210 and 220 of FIG. 2 to increase the gain with respect to the specific direction 250 in which the reception phases coincide, and other directions in the range of the communication angle 260. Relative to. Here, the communication angle is an angle between signals transmitted through the antennas 210 and 220 or an angle between signals received through the antennas 210 and 220.

In addition, the mobile stations 230 and 240 having the change in the speed of the communication communicate with irregular gain even in the same direction with respect to the receiving antenna due to the change in phase due to the Doppler effect.

As described above, in the conventional mobile communication system, the receiving device has an element of loss as an irregular gain in the communication angle range on the back of the compensation for the multiple reception paths, and in the case of a mobile station using a digital method, the gain of the reception. In order to increase the number of antennas and receiving circuits, the gain is compensated for a specific direction, and there is a problem in that the stability and reliability of the gain are deteriorated when the counterpart of the communication is widely distributed or has an irregular moving speed.

Accordingly, an object of the present invention is to provide a receiving apparatus that can obtain a stable transmission and reception gain in a mobile communication environment by adding a frequency component suitable for a digital mobile communication system. There is this.

According to an aspect of the present invention, there is provided a receiving apparatus of a mobile communication system, comprising: first and second receiving processing means for receiving a high frequency signal from a transmitting side to compensate and amplify a gain; Shift frequency generating means for generating a shift frequency having a predetermined period; First intermediate frequency converting means for mixing the output signal of the first receiving processing means and the shift frequency to convert a high frequency signal transmitted from the first receiving processing means into a first intermediate frequency signal; Second intermediate frequency converting means for converting a high frequency signal transmitted from said second receiving processing means into a second intermediate frequency signal; And converting and demodulating the first intermediate frequency signal converted by the first intermediate frequency converting means and the second intermediate frequency signal converted by the second intermediate frequency converting means into a baseband signal and demodulating the original signal. Means;

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

3 is a block diagram of an embodiment of a receiving apparatus in a mobile communication system according to the present invention.

As shown in FIG. 3, the reception apparatus of the present invention includes outputs of the first and second reception preprocessors 311 and 312 and the first reception preprocessor 311 that receive the same reception signal at different positions. A first reception amplifier 313 for amplifying the signal, a second reception amplifier 314 for amplifying the output signal of the second reception preprocessor 312, and a shift frequency for generating a preset shift frequency A first intermediate frequency converting unit 316 for converting the signal transmitted from the first receiving amplifier 313 to the first intermediate frequency by mixing the generator 315 and the shifted frequency; A second intermediate frequency converter 317 for converting the signal transmitted from 314 to the second intermediate frequency, and the signals transmitted from the first and second intermediate frequency converters 316 and 317 are converted into baseband signals. And a demodulation and demodulation unit 318 for demodulating the original signal. In this case, the frequency difference transmitted to the transform and demodulator 318 of the first and second intermediate frequencies changes periodically over time.

4 is an explanatory diagram of a receiving apparatus in a mobile communication system according to the present invention.

5 is an exemplary diagram of a period of a shift frequency generated from the shift frequency generator of FIG. 3.

The operation of the reception device of the present invention having the structure as described above will be described in detail with reference to FIGS. 4 and 5 as follows.

The high frequency signal transmitted from the transmitting end of the mobile station is transmitted to the first and second reception preprocessors 311 and 312 having arbitrary angles and speeds within the communication angle 460 of FIG. In this case, the first and second reception preprocessors 311 and 312 perform a diversity function, that is, compensate for gain of spatial path cancellation compensation or deflection angle.

In addition, the first reception amplifier 313 amplifies the signal transmitted from the first reception preprocessor 311 to a signal level suitable for the first intermediate frequency converter 316, and further includes a second reception amplifier ( 314 also amplifies the signal transmitted from the second reception preprocess 312 to a signal level suitable for the second intermediate frequency converter 317.

Subsequently, the first intermediate frequency converter 316 mixes the shifted frequency transmitted from the shifted frequency generator 315 and the output signal of the first received amplifier 313 and transmits the shifted signal from the first received amplifier 313. The high frequency signal is converted into the first intermediate frequency and transferred to the conversion and demodulation unit 318. In addition, the second intermediate frequency converter 317 converts the high frequency signal transmitted from the second reception amplifier 314 into the second intermediate frequency and transmits the converted high frequency signal to the converter and demodulator 318.

In this case, the first intermediate frequency converter 316 converts the high frequency signal transmitted from the first reception amplifier 313 into an intermediate frequency in accordance with the shift period of the shifted frequency as shown in FIG. 5. The frequencies converted by the second intermediate frequency converter 316 are different from each other.

Therefore, in the effect of combining the combined pattern direction between the first and second reception preprocessors 311 and 312 (see the directing direction 420 of FIG. 4) and the mobile environment of the mobile stations 430 and 440 of FIG. 4. The shifting Doppler effect has an adaptation effect within the shifted frequency interlocking range.

As such, the signals converted to the first and second intermediate frequencies are converted into baseband signals by the conversion and demodulation unit 318 and then demodulated into the original signals.

Although the technical idea of the present invention has been described in detail according to the above preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the present invention eliminates gain improvement and degradation in a specific direction in the diversity scheme by adding a shift frequency at the receiving side of the mobile communication system, thereby reducing the gain in the transmission / reception range of the signal. It is possible to take an even gain and to significantly improve the communication quality by preventing data loss due to the Doppler effect according to the moving speed of the mobile station.

Claims (3)

In the reception device of a mobile communication system, First and second reception processing means for receiving a high frequency signal from a transmitting side to compensate and amplify gain; Shift frequency generating means for generating a shift frequency having a predetermined period; First intermediate frequency converting means for mixing the output signal of the first receiving processing means and the shift frequency to convert a high frequency signal transmitted from the first receiving processing means into a first intermediate frequency signal; Second intermediate frequency converting means for converting a high frequency signal transmitted from said second receiving processing means into a second intermediate frequency signal; And Conversion and demodulation means for converting the first intermediate frequency signal converted by the first intermediate frequency converting means and the second intermediate frequency signal converted by the second intermediate frequency converting means into a baseband signal and demodulating the original signal. Receiving device in a mobile communication system comprising a. The method of claim 1, The first and second receiving processing means, respectively, A receiving apparatus in a mobile communication system, which performs a diversity function to compensate for gain of spatial path cancellation or deflection angle. The method of claim 1, The first intermediate frequency conversion means, And the high frequency signal transmitted from the first receiving processing means is converted into an intermediate frequency in accordance with a variation period of the shift frequency transmitted from the shift frequency generating means.

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