KR100285284B1 - Repeater System for Frequency Stability Compensation Using Subcarrier. - Google Patents

Abstract

The repeater system for compensating for frequency stability using the disclosed subcarrier further transmits a plurality of subcarrier frequencies having the same stability under the influence of the stability of the reference oscillation frequency in the transmitting apparatus, By using the corresponding frequency as a reference oscillation frequency and making it equal to the stability of the reference oscillation frequency in the transmitting apparatus and canceling each other to compensate for the frequency stability of the mobile communication frequency band signal to be relayed.

The present invention relates to a mobile communication system in which a mobile communication frequency band signal received from a base station is mixed with a local oscillation frequency for an intermediate frequency conversion and converted into an intermediate frequency band signal and a plurality of sub carrier frequencies having the same stability, A frequency stabilization compensating transmission device for mixing the local oscillation frequency with a local oscillation frequency for super high frequency conversion and converting the signal into an ultra high frequency band signal and transmitting the super high frequency band signal together; Frequency band signals transmitted from the transmission apparatus are mixed with the local oscillation frequency for intermediate frequency conversion and converted into an intermediate frequency band signal, and the frequency corresponding to the frequency difference between the sub-carrier frequencies is returned again to be used as a reference oscillation frequency And a receiver for frequency stability compensation for outputting a mobile communication frequency band signal compensated for frequency stability by canceling each other by making the stability of the local oscillation frequency for frequency conversion equal to that of the received signal and outputting the compensated mobile communication frequency band signal to the mobile station or another base station do.

Therefore, even if the stability of the reference oscillation frequency affects the frequency stability of the mobile communication frequency band signal in a repeater using a very high frequency, the transmission performance and quality of the mobile communication frequency band signal are improved by compensating using the subcarrier, The reliability of the repeater can be improved and the installation and maintenance of the repeater can be facilitated.

Description

Repeater system for frequency stability compensation using subcarriers

The present invention relates to an apparatus for compensating for frequency stability of a mobile communication frequency band signal relayed using subcarriers in a mobile communication repeater system using a reference oscillator.

More specifically, a transmitting apparatus of a repeater system further transmits a plurality of sub-carrier frequencies that are influenced by the stability of a reference oscillation frequency and have the same stability, and the receiving apparatus transmits a frequency corresponding to a difference between the sub- Is used as an oscillation frequency to make it equal to the stability of the reference oscillation frequency in the transmitter, and to cancel each other so as to compensate for the frequency stability of the mobile communication frequency band signal to be relayed.

In general, in a mobile communication system, a repeater system is used to expand a service area or to solve a shadow area. In order to improve the transmission efficiency of a mobile communication frequency band signal to be relayed and to prevent communication quality degradation due to interference, And is used as a signal transmission medium.

In a mobile communication repeater system using a reference oscillator, the frequency stability of the mobile communication frequency band signal to be transmitted increases as the relay frequency between the transmitter and the receiver increases, and the transmission efficiency decreases.

Especially, in case of relaying using a very high frequency compared to a mobile communication frequency band signal, the frequency stability is improved by using a high quality reference oscillator or using an apparatus receiving an expensive GPS (Global Positioning System).

FIG. 1 is a block diagram of a conventional repeater system for transmitting and receiving a very high frequency band signal, FIG. 2 (a) is a block diagram of a transmitter for transmitting a very high frequency band signal in a conventional repeater system, Frequency band signals in the system.

As shown in FIG. 1, a repeater system for transmitting and receiving a very high frequency band signal includes a transmitter 11 for receiving a mobile communication frequency band signal from a base station, amplifying and then converting the signal into a very high frequency band signal, And a receiving device 12 for receiving the very high frequency band signal outputted from the transmitting device 11, converting it into a mobile communication frequency band signal, amplifying it, and sending it to a mobile station or another base station.

The operation principle of the transmission apparatus 11 will be described with reference to FIG. 2A.

From the reference oscillator 11a, f _r The frequency of oscillation is generally not output and has a small range. The ratio of the frequency swing width to the signal frequency is defined as the frequency stability in order to indicate the swing of the frequency. Therefore, the reference oscillation frequency outputted from the reference oscillator 11a f _r Stability of Δα The reference oscillation frequency actually output is (1 + DELTA alpha) f _r .

The reference oscillator 11a outputs the reference oscillation frequency (1 + DELTA alpha) f _r Are input to a first local oscillator (11b) and a second local oscillator (11c) for outputting a local oscillation frequency for converting a mobile communication frequency band signal into an intermediate frequency band and a very high frequency band, respectively, Reference oscillation frequency (1 + DELTA alpha) f _r Stability of Δα The frequency of the same stability as the frequency (1 + DELTA alpha) f _{L One} , (1 + DELTA alpha) f _{L 2} .

In the transmitting apparatus 11, Δf _B And the center frequency is f _s And then amplifies the local oscillation frequency output from the first local oscillator 11b, (1 + DELTA alpha) f _{L One} And the intermediate frequency conversion unit 11d mix the signals to obtain the bandwidth Δf _B But the center frequency is f _s - (1 + ??) f _{L One} And the intermediate frequency band signal outputted from the intermediate frequency converting unit 11d is passed through only the part corresponding to the signal component in the bandpass circuit unit 11e and the remaining parts are removed.

And outputs the intermediate frequency band signal extracted by the band-pass circuit section 11e to the local oscillation frequency output from the second local oscillator 11c (1 + DELTA alpha) f _{L 2} And the super-high-frequency converter 11d mix the bandwidth Δf _B But the center frequency is f _s + (1 + ??) (f _{L 2} -f _{L One} ) And outputs the signal to the transmitter 11.

Therefore, the frequency stability of the very high frequency band signal transmitted from the transmission apparatus 11 is (f _{L 2} -f _{L One} ) Δα Here, usually dozens GHz The local oscillation frequency of the second local oscillator close to the ultra high frequency f _{L 2} Normal number GHz The local oscillation frequency of the first local oscillator close to the mobile communication frequency f _{L One} The frequency stability is significantly increased in the case of relaying using a very high frequency, which greatly affects the signal transmission quality.

The operation principle of the receiving apparatus 12 will be described with reference to FIG. 2B.

The reference oscillation frequency output from the reference oscillator 12a of the receiving device 12 (1 + ??) f _r Is inputted to a second local oscillator (12c) and a first local oscillator (12b) for outputting a local oscillation frequency for converting the received very high frequency band signal into an intermediate frequency band and a mobile communication frequency band, respectively, The reference oscillation frequency (1 + ??) f _r Stability of Δβ The frequency of the same stability as the frequency (1 + ??) f _{L 2} , (1 + ??) f _{L One} .

The stability of the reference oscillation frequency of the receiving device 12 Δβ The stability of the reference oscillation frequency of the transmitter 11 Δα The environment of the device is different according to the position, and the synchronization of the signals is different, so that the size and the sign may be different from each other.

The bandwidth transmitted from the transmission apparatus 11 is Δf _B But the center frequency is f _s + (1 + ??) (f _{L 2} -f _{L One} ) And outputs the local oscillation frequency output from the second local oscillator 12c (1 + ??) f _{L 2} And the intermediate frequency conversion unit 12d mix the bandwidth Δf _B But the center frequency is f _s - (1 + ??) f _{L One} + (?? - ??) f _{L 2} And the intermediate frequency band signal output from the intermediate frequency conversion unit 12d is passed through only the portion corresponding to the signal component in the bandpass circuit unit 12e and the remaining portions are removed.

The intermediate frequency band signal extracted by the band-pass circuit portion 12e is converted into a local oscillation frequency (" 1 ") output from the first local oscillator 12b (1 + ??) f _{L One} ) And the mobile communication frequency conversion unit 12d mix the bandwidth Δf _B But the center frequency is f _s + (?? - ??) (f _{L 2} -f _{L One} ) And transmits the signal to the mobile station or another base station.

Therefore, the frequency stability of the mobile communication frequency band signal relayed from the receiving device 12 (?? - ??) (f _{L 2} -f _{L One} ) Lt; / RTI & Δα Wow Δβ Can vary in size and sign depending on the state of the transmitting / receiving apparatus. Therefore, in the worst case, each transmitting and receiving apparatus can increase in proportion to the sum of the stability of the reference oscillating frequency.

In order to reduce the frequency stability of the mobile communication frequency band signal due to the stability of the reference oscillation frequency, it is generally necessary to use a reference oscillator having a very high frequency stability or use a signal received from the GPS instead of the reference oscillator There was a problem.

That is, in a repeater using a very high frequency, the frequency stability of the mobile communication frequency band signal is greatly influenced by the stability of the reference oscillation frequency. Since there is a limit to improve the frequency stability of the reference oscillator, There was a very difficult problem in relaying without affecting.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a transmission apparatus and a method for transmitting a frequency corresponding to a difference between the subcarrier frequencies in a receiving apparatus by transmitting a plurality of subcarrier frequencies having the same stability, Frequency to stabilize the reference oscillation frequency stability of the reception apparatus to be equal to the reference oscillation frequency stability of the transmission apparatus so that the stability of the reference oscillation frequency compensates for the adverse influence on the frequency stability of the mobile communication frequency band signal to be relayed The purpose is to construct a repeater system.

1 is a block diagram of a conventional repeater system transmitting and receiving using a very high frequency;

FIG. 2A is a block diagram of a transmitting apparatus for transmitting a very high frequency band signal in a conventional repeater system using microwave,

2B is a block diagram of a receiving apparatus for receiving a very high frequency band signal in a conventional repeater system using microwave,

3 is a block diagram of a repeater system for transmitting and receiving a very high frequency band relay signal including a subcarrier frequency component of the present invention,

4A is a block diagram of an embodiment of a transmitting apparatus for transmitting a very high frequency band relay signal including two subcarrier frequency components in a repeater system of the present invention.

4B is a block diagram of an embodiment of a receiving apparatus for receiving a very high frequency band relay signal including two sub carrier frequency components in a repeater system of the present invention.

Description of the Related Art [0002]

31: Transmission device for frequency stability compensation 31a: Reference oscillator for transmission

31b: first local oscillator for transmission 31c: second local oscillator for transmission

31d: first subcarrier generator 31e: second subcarrier generator

31f: Intermediate frequency conversion section for transmission 31g: Transmission band-pass circuit section

31h: power combining section 31i: transmitting high frequency conversion section

32: Receiver for frequency stability compensation 32a: Receiving reference oscillator

32b: switching circuit portion 32c: receiving second local oscillator

32d: first local oscillator for reception 32e: intermediate frequency converter for reception

32f: power distribution section 32g: receiving band-pass circuit section

32h: first subcarrier band passing circuit portion

32i: second subcarrier band passing circuit portion

32j: reference oscillation frequency conversion unit 32k: mobile communication frequency conversion unit

32m: Frequency rejection

In order to achieve the object, a repeater system for compensating for frequency stability using subcarriers according to the present invention amplifies a mobile communication frequency band signal received from a base station, mixes the signal with a local oscillation frequency for intermediate frequency conversion, A frequency stabilization compensating transmission unit for mixing the local oscillation frequency with a plurality of sub carrier frequencies and then mixing the frequency with a local oscillation frequency for a very high frequency conversion, Frequency band signals transmitted from the transmission apparatus for frequency stability compensation are mixed with the local oscillation frequency for intermediate frequency conversion to convert them into an intermediate frequency band and the sub carrier frequencies are respectively extracted and converted into a reference oscillation frequency, And a receiver for frequency stability compensation that mixes the local oscillation frequency for mobile communication frequency conversion and converts the signal into a mobile communication frequency band signal to output a signal having the frequency stability compensated for transmission to a mobile station or another base station.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration and an embodiment of a repeater system for compensating for frequency stability using subcarriers according to the present invention will be described with reference to the accompanying drawings.

3 is a block diagram of a repeater system for transmitting and receiving a very high frequency band relay signal including a sub carrier frequency component of the present invention. FIG. 4A is a block diagram of a repeater system including two sub carrier frequency components FIG. 4B is a block diagram of an embodiment of a receiving apparatus for receiving a very high frequency band relay signal including two subcarrier frequency components in a repeater system according to the present invention. FIG.

3, a repeater system for transmitting and receiving a very high frequency band relay signal including a sub carrier frequency component mixes a mobile communication frequency band signal received from a base station with a local oscillation frequency of a similar frequency band to generate an intermediate frequency band (31) for transmitting a very high frequency band relay signal including a plurality of sub carrier frequencies and mixing them with a local oscillation frequency of a very high frequency band to include a frequency band component, and a transmission device Frequency band relay signal including the sub-carrier frequency component output from the sub-carrier frequency converter 31 to an intermediate frequency band, extracts a frequency corresponding to the frequency difference between the sub-carrier frequencies, and uses the frequency as a reference oscillation frequency The mobile station compensated for the frequency stability And a frequency stability compensation receiver 32 for transmitting a frequency band signal to a mobile station or another base station.

As shown in FIG. 4A, the frequency stability-compensating transmitting apparatus 31 has a frequency stability of Δα Reference oscillation frequency (1 + DELTA alpha) f _r A transmission reference oscillator 31a for outputting a reference oscillation frequency 31a output from the transmission reference oscillator 31a, (1 + DELTA alpha) f _r A first local oscillator 31b for transmitting and a second local oscillator 31c for transmitting a local oscillation frequency used for converting the mobile communication frequency band signal into an intermediate frequency band and a very high frequency band, A first subcarrier generator 31d and a second subcarrier generator 31e for outputting intermediate frequency subcarriers whose frequencies differ from each other by n times the reference oscillation frequency outputted from the credit reference oscillator 31a, ΔB And the center frequency is f _s A transmission intermediate frequency conversion unit 31f for amplifying the mobile communication frequency band signal and mixing it with the local oscillation frequency output from the first local oscillator 31b to convert it to an intermediate frequency band, A transmission band-pass circuit section 31g for extracting only signal components from the intermediate frequency band signals output from the frequency conversion section 31f; A power combining section (31f) for combining each frequency and signal output from the circuit section (31g), an intermediate frequency band signal including a subcarrier frequency component from the power combining section (31f) And a transmission high-frequency transform unit 31i for mixing the local oscillation frequency output from the high-frequency oscillator 31c and transmitting the very high frequency band relay signal including the sub-carrier frequency component.

It is possible to use a frequency which is 1 / n times the frequency difference instead of n times the reference oscillation frequency output from the transmission reference oscillator 31a.

Further, as shown in FIG. 4B, the receiver 32 for frequency stability compensation has a frequency stability of Δβ Reference oscillation frequency (1 + ??) f _r A switching circuit part 32b for initially selecting a reference oscillation frequency outputted from the reception reference oscillator and initially selecting a reference oscillation frequency generated from the received signal, A receiving second oscillator 32c receiving a reference oscillation frequency selected from the switching circuit portion 32b and outputting a local oscillation frequency used for converting the high frequency signal into an intermediate frequency band and a mobile communication frequency band, Frequency band signal including the subcarrier frequency component transmitted from the transmission device 31 for frequency stability compensation and then outputs the local oscillation signal to the local oscillator 32c output from the receiving second local oscillator 32c, A receiving intermediate frequency converting section 32e for mixing with an oscillation frequency and converting the frequency into an intermediate frequency band, a receiving intermediate frequency converting section 32e, For extracting only a signal component from an intermediate frequency band signal including a subcarrier frequency outputted from the power distributing section 32f; a power distributing section 32f for distributing the intermediate frequency signal outputted from the power distributing section 32f A first subcarrier band passing circuit portion 32h for extracting a first subcarrier frequency from an intermediate frequency band signal output from the power distributing portion 32f and a second subcarrier band passing circuit portion 32h for extracting a middle A second subcarrier band passing circuit portion 32i for extracting a second subcarrier frequency among the frequency band signals and a second subcarrier band passing circuit portion 32i for combining the two frequencies outputted from the first subcarrier band passing circuit portion 32h and the second subcarrier band passing circuit portion 32i A reference oscillation frequency conversion unit 32j for outputting a reference oscillation frequency, a frequency oscillation frequency conversion unit 32e for performing frequency domain conversion on the signal output from the reference oscillation frequency conversion unit 32j, A first frequency divider 32b for dividing the intermediate frequency band signal output from the reception bandpass circuit 32g and the reception first local oscillator 32d, And a mobile communication frequency converter 32k for mixing the local oscillation frequency outputted from the mobile communication frequency band signal and converting it into a mobile communication frequency band signal.

Therefore, the operation principle of the transmission apparatus 31 for frequency stability compensation and the reception apparatus 32 for frequency stability compensation of the present invention will be described with reference to FIG.

For the sake of understanding, the specific frequency values will be described as examples in each of the above-mentioned partial devices. First, in the frequency stability compensation transmission apparatus 31, Δα ( ± 1 ppm Quot; reference oscillation frequency < RTI ID = 0.0 > (1 + DELTA alpha) f _r ( (1-1 × 0.000001) × 24 MHz to (1 + 1 × 0.000001) × 24 MHz = 23.999999 MHz to 24.000001 MHz ).

The reference oscillation frequency (24 MHz ) Signals (1 + DELTA alpha) f _r Frequency type (1.7 < RTI ID = 0.0 > GHz ) Transmitting first local oscillator 31b and the high-frequency type 18 GHz To the first subcarrier generator 31d and the second subcarrier generator 31e, which output subcarriers similar to the frequencies of the second local oscillator 31c for transmission and the first local oscillator 31b for transmission.

In the transmission intermediate frequency conversion section 31f, the low frequency local oscillation frequency including the frequency variation range output from the first transmission local oscillator 31b (1 + DELTA alpha) f _{L One} Of 1.7 GHz (-) signal of the base station and 1.8 GHz Frequency mobile communication signal ( f _s ) Were mixed to give 100 MHz And outputs the low frequency band.

Since the transmission bandpass circuit portion 31g extracts the low frequency band mobile communication signal from the intermediate frequency signal outputted from the transmission intermediate frequency conversion portion 31f, MHz Is inputted to the power combining section 31h.

From the first subcarrier generator 31d to (100-6) MHz (100 + 6) from the second sub-carrier generator 31e, MHz Is synthesized in the power combiner 31h with the angular frequency signal output from the band-pass circuit 31h.

The mobile communication signal component and the first and second subcarrier signal components output from the power combining section 31g are supplied to the high frequency local oscillation frequency 18 GHz of (1 + DELTA alpha) f _{L 2} Frequency conversion unit 31i to produce a high-frequency signal 18.1 GHz of f _s + (1 + ??) (f _{L 2} -f _{L One} ) And 18.094, 18.106 GHz Frequency signal for a subcarrier of f _s + (1 + ??) (f _{L 2} + f ₁ ) , f _s + (1 + ??) (f _{L 2} + f ₂ ) .

4B, in the reception apparatus 32 for frequency stability compensation, the reception reference oscillator 32a initially receives a reference frequency (for example, f _r ) And frequency variation width with frequency variation f _r x? And outputs the reference frequency signal.

In the beginning, the reference frequency signal 1 +? But the signal components that have passed through the reference oscillation frequency converter 32j are completely removed from the subcarriers and the frequencies and frequency variation widths oscillated by the transmitter 31 for frequency stability compensation 1 + Δα Only the reference frequency signal remains.

Therefore, when a very high frequency signal is input to the reception device 32 for frequency stability compensation, the reference oscillation frequency converter 32j (1 + DELTA alpha) f _r The signal component is simultaneously input to the switching circuit portion 32b and the receiving first local oscillator 32d. That is, after the initial stage, by the switching operation of the switching circuit portion 32b (1 + DELTA alpha) f _r And the signal component is input to the second local oscillator 32c.

That is, the switching circuit portion 32b is initially a reference frequency signal generated in its own receiving reference oscillator 32a (1 + ??) f _r However, in the initial stage in which a very high frequency signal is input (1 + DELTA alpha) f _r When a signal of a component is detected, (1 + DELTA alpha) f _r Signal is used instead of the reference oscillator.

The reception intermediate frequency conversion section 32e receives the mobile communication use high frequency signal 18.1 GHz ) And sub-carrier high frequency signals (18.094, 18.106 GHz ) And the second local oscillator 32c (1 + DELTA alpha) f _r Frequency type (18 GHz ) Component signals of the local oscillation frequency, and the signals are mixed in the low frequency bands 0.1, 0.094, and 0.106 GHz Is output.

The signal components of the low frequency band outputted from the receiving intermediate frequency converting section 32e are distributed in different directions by the power distributing section 32f and are received by the receiving band passing circuit section 32g at the intermediate frequency 100 MHz , 94 MHz And 106 MHz ) Signal component in the low frequency band 100 MHz Of the intermediate frequency signals output from the power divider 32f by the first subcarrier band passing circuit portion 32h are extracted from the first subcarrier 94 MHz Of the intermediate frequency signals output from the power dividing section 32f by the second subcarrier band passing circuit section 32i, MHz ) Signal.

The reference oscillation frequency conversion unit 32j synthesizes the difference of the signals output from the first subcarrier band passing circuit unit 32h and the second subcarrier band passing circuit unit 32i to remove the subcarrier, 1 local oscillator 32d and the switching circuit portion 32b.

What is important here is that in the initial stage of the operation of the receiver 32 for frequency stability compensation, f _r x? The reference frequency signal (1 + ??) f _r However, in the initial stage, the received very high frequency signal passes through the reference oscillation frequency conversion section 32j, so that the subcarriers are canceled, and the frequency variation width 1 + Δα And the subcarrier frequency band 12 MHz : f ₂ -f ₁ ). That is, the frequency signal component output from the reference oscillation frequency conversion section 32j is _{(1 + Δα) (f 2} -f 1) Only.

The reference oscillation frequency converter 32j converts the signal of the difference between the second subcarrier signal component and the first subcarrier signal component f ₂ -f ₁ Multiplies the frequency by A times, and outputs the output frequency of the reference oscillator, so that the A times is n or 1 / n times.

The reference symbol A denotes the frequency of the oscillation frequency of the transmission reference oscillator 31a generated by the transmission apparatus 31 for frequency stability compensation MHz ) And the frequency bands of two subcarriers (12 MHz ), The frequency is multiplied by A times. That is, 'A = 2' is applied in this embodiment, and the frequencies are matched by doubling the frequency.

Therefore, when the frequency difference between the two subcarrier components generated by the transmission apparatus for frequency stability compensation 31 is set to be n (or 1 / n) times the reference oscillator frequency, Of the transmission apparatus 31 for frequency stability compensation is set to 1 / n (or n) times the reference oscillator frequency 1 + Δα Can be used equally in the receiver 32 for frequency stability compensation.

In the mobile communication frequency conversion section 32k, the mobile communication terminal 100 (100) output from the transmission band-pass circuit section 32g MHz ) Signal component f _s - (1 + ??) f _{L One} And a low-frequency signal (1.7) output to the receiving first local oscillator (32d) GHz ) Signal component (1 + DELTA alpha) f _{L One} Which is the frequency variation width of the transmission reference oscillator 31a generated in the transmission apparatus 31 for frequency stability compensation (1 + DELTA alpha) f _{L One} Lt; RTI ID = 0.0 > 1.8 < / RTI > GHz Frequency mobile communication signal ( f _s ).

Accordingly, the final signal output from the mobile communication frequency converter 32k is a frequency variation value (frequency variation value) corresponding to the frequency stability of the reference oscillators 31a and 32a Δα , Δβ Only the mobile communication signal fs is transmitted to the mobile station or another base station.

The repeater system for compensating the frequency stability of a mobile communication frequency signal using subcarriers according to the present invention configured and operating as described above has the effect that the stability of the reference oscillation frequency affects the frequency stability of the mobile communication frequency band signal in a repeater using a very high frequency Is compensated by using subcarriers, thereby improving the transmission performance and quality of the mobile communication frequency band signal and improving the reliability of the microwave repeater, thereby facilitating the installation and maintenance of the repeater.

Claims (6)

The mobile communication frequency band signal received from the base station is amplified and then mixed with the local oscillation frequency for intermediate frequency conversion to convert it into an intermediate frequency band and synthesized with a plurality of sub carrier frequencies and mixed with a local oscillation frequency for a very high frequency conversion, A transmission apparatus for frequency stability compensation that converts the signal into a signal; And Frequency band signals transmitted from the transmission apparatus for frequency stability compensation are mixed with the local oscillation frequency for intermediate frequency conversion to convert them into an intermediate frequency band and the sub carrier frequencies are respectively extracted and converted into a reference oscillation frequency, And a receiver for frequency stability compensation which mixes the local oscillation frequency for mobile communication frequency conversion and converts the signal into a mobile communication frequency band signal to output a signal having the frequency stability compensated for transmission to a mobile station or another base station. Repeater System for Frequency Stability Compensation. The transmission apparatus of claim 1, wherein the frequency stability compensation transmission apparatus comprises: Frequency stability Δα Reference oscillation frequency (1 + DELTA alpha) f _r A transmission reference oscillator for outputting the output signal; The reference oscillation frequency outputted from the transmission reference oscillator (1 + DELTA alpha) f _r A first local oscillator for transmission and a second local oscillator for transmitting a local oscillation frequency used for converting a mobile communication frequency band signal into an intermediate frequency band and a very high frequency band, respectively; A first subcarrier generator and a second subcarrier generator for outputting an intermediate frequency subcarrier having a frequency difference of n times the reference oscillation frequency outputted from the transmission reference oscillator; The bandwidth received from the base station ΔB And the center frequency is f _s An intermediate frequency converter for amplifying a mobile communication frequency band signal and mixing the local oscillation frequency output from the first local oscillator for transmission to an intermediate frequency band; A transmission band-pass circuit section for extracting only signal components from the intermediate frequency band signals output from the transmission intermediate frequency conversion section; A power combiner for combining respective frequencies and signals output from the first sub-carrier generator, the second sub-carrier generator, and the transmission band-pass circuit; And Frequency signal including a sub-carrier frequency component and a local oscillation frequency output from the second local oscillator for transmission, and transmitting a very high frequency band relay signal including a sub-carrier frequency component, And a transform unit for transforming the frequency stability of the received signal. The receiver according to claim 1, wherein the receiver for frequency stability compensation comprises: Frequency stability Δβ Reference oscillation frequency (1 + ??) f _r A reception reference oscillator for outputting a reception signal; A switching circuit for initially selecting a reference oscillation frequency output from the reference oscillation receiver and selecting a reference oscillation frequency generated from the received signal; A receiving second local oscillator and a receiving first local oscillator receiving a reference oscillation frequency selected from the switching circuit and outputting a local oscillation frequency used to convert the high frequency signal into an intermediate frequency band and a mobile communication frequency band, respectively; Frequency band including a sub-carrier frequency component transmitted from the transmission apparatus for frequency stability compensation, and then mixes the local oscillation frequency with the local oscillation frequency output from the reception second local oscillator to convert it into an intermediate frequency band A conversion unit; A power distributor for distributing the intermediate frequency signals output from the reception intermediate frequency converter in different directions; A reception band-pass circuit for extracting only a signal component from an intermediate frequency band signal including a sub carrier frequency outputted from the power divider; A first subcarrier band pass circuit for extracting a first subcarrier frequency among the intermediate frequency signals output from the power divider; A second subcarrier band pass circuit for extracting a second subcarrier frequency from the intermediate frequency band signals output from the power divider, A reference oscillation frequency converter for combining the two frequencies output from the first and second subcarrier band passing circuit units and outputting a reference oscillation frequency; A sine / drain converter converting the signal output from the reference oscillation frequency converter into a frequency domain signal and outputting the signal simultaneously to the receiving first local oscillator and the switching circuit; And a mobile communication frequency converter for mixing the intermediate frequency band signal output from the reception band-pass circuit and the local oscillation frequency output from the receiver first local oscillator into a mobile communication frequency band signal. A Repeater System for Frequency Stability Compensation Using. 3. The method of claim 2, Wherein a frequency of 1 / n times the frequency of the reference frequency signal output from the transmission reference oscillator can be used instead of n times the reference frequency signal output from the transmission reference oscillator. The apparatus of claim 3, wherein the holding water converter comprises: And the frequency is multiplied by n or 1 / n times the difference between the oscillation frequency of the transmission reference oscillator generated in the transmission apparatus for frequency stability compensation and the frequency band of the two subcarriers. . The plasma display apparatus of claim 3, wherein the switching circuit unit comprises: Initially, the reference frequency signal generated by its reference oscillator (1 + ??) f _r However, in the initial stage in which a very high frequency signal is input (1 + DELTA alpha) f _r The signal of the component is detected, (1 + DELTA alpha) f _r Wherein the signal has a switching action to be selected instead of the receiving reference oscillator.