KR100545018B1 - seperated radio relay system - Google Patents

Abstract

The present invention relates to a wireless relay system, and more particularly, to a separate wireless relay system capable of fundamentally eliminating a feedback phenomenon occurring in a relay system by physically easily separating a radio relay reception point and a transmission point. In the conventional integrated wireless relay system, in order to prevent feedback caused by the transmission signal output from the transmission device of the relay system to the receiving device of the relay system, the limitation of the transmission output range, the limitation of the transmission / reception antenna structure, and the transmission / reception antenna There were problems such as constraints on installation and operation for physical separation. In addition, the integrated relay system has a problem that the service is not easy due to the decrease in reception sensitivity in the shadow area, such as the building interior and underground space.

In order to solve the above problems, the present invention provides a wireless relay system for receiving and amplifying a modulated signal transmitted from a satellite and a base station and transmitting the amplified signal to a mobile station and another relay device. A main system for demodulating the decoded signal and modulating the demodulated signal again to transmit the demodulated signal to a physically spaced position; And a subsystem located physically spaced apart from the main system, receiving, demodulating, and modulating the modulated signal transmitted from the main system and transmitting the modulated signal back to the mobile station and another relay.

Therefore, the present invention can fundamentally eliminate the feedback phenomenon of the wireless relay system and provide the high quality service even in the shadow area.

Satellite, relay, feedback

Description

Separated radio relay system

1 is a block diagram of a wireless relay system according to the prior art;

2 is a basic block diagram of a wireless relay system according to the present invention;

3A is a block diagram of a first embodiment of a wireless relay system according to the present invention;

3b is a block diagram of a second embodiment of a wireless relay system according to the present invention;

3C is a block diagram of a third embodiment of a wireless relay system according to the present invention;

3d is a block diagram of a fourth embodiment of a wireless relay system according to the present invention;

3E is a block diagram of a fifth embodiment of a wireless relay system according to the present invention;

Figure 4a is a detailed block diagram of a wireless relay system supporting the System E standard,

Figure 4b is a block diagram showing another embodiment of a wireless relay system supporting the System E standard;

Figure 5a is a detailed block diagram of a wireless relay system supporting the System A standard,

Figure 5b is a block diagram showing another embodiment of a wireless relay system supporting the System A standard,

Figure 6a is a detailed block diagram of a wireless relay system supporting the 8VBS standard,

Figure 6b is a block diagram showing another embodiment of a wireless relay system supporting the 8VBS standard.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless relay system, and more particularly to a separate type wireless relay system capable of eliminating the feedback phenomenon generally occurring in a relay system.

The wireless relay system is a device for receiving a signal transmitted from the satellite or base station 100 in the wireless relay system 120 located in the shaded area, amplifies it, and retransmits it to the mobile station or the relay device 140. In particular, a regeneration repeater in which a demodulator 122 and a modulator 124 are added, as compared to a simple relay system, can effectively remove noise and is widely used in recent satellite broadcasting systems.
In general, the relay system of the terrestrial base station has been developed and used a separate system, but the integrated relay system has been developed and used due to the noise problem due to the signal transmission method between the main device and the remote device and the problem of installation is not easy.
However, it is difficult to fundamentally solve the feedback phenomenon occurring due to the structure of the integrated system, and there are problems such as a limitation of transmission power, a limitation on the structure of the transmit / receive antenna, and a limitation on the installation and operation of the transmit / receive antenna.
In addition, when the modulation method of the received signal and the modulation method of the transmission signal are different, there is a problem in that the frequency efficiency is lowered because an additional frequency must be allocated. In addition, the integrated relay device has a problem that it is not easy to use in a building, underground space, etc. because the reception sensitivity of the signal in the shaded area is low.

Accordingly, an object of the present invention is to fundamentally eliminate the feedback phenomenon of the radio relay system in order to solve the above problems, to overcome the physical location limitations of the reception point and the transmission point to provide a high quality service even in the shadow area. The purpose is to provide a relay system.

The wireless relay system according to the present invention is a wireless relay system for receiving and amplifying a modulated signal transmitted from a satellite and a base station to transmit the amplified signal to a mobile station and another relay device, wherein the modulation received from the satellite and the base station. A main system for demodulating the decoded signal and modulating the demodulated signal again to transmit the demodulated signal to a physically spaced position; And a subsystem located physically spaced apart from the main system, receiving a demodulated signal transmitted from the main system, demodulating the modulated signal, and transmitting the modulated signal to the mobile station and another relay device.

The main system includes a receiver / demodulator for demodulating and outputting the modulated signal received from the satellite and the base station; And a transmission shear unit for receiving the demodulated signal output from the reception / demodulation unit and modulating it again to transmit the demodulated signal to a physically spaced position.

The subsystem may include: a transmission post-end unit configured to receive, demodulate, and output a modulated signal transmitted from the main system; And a modulator / transmitter for receiving a demodulated signal output from the transmission post-end part, modulating the demodulated signal, and transmitting the modulated signal to the mobile station or another relay device.

It is preferable to further include a multiplexing unit for receiving the demodulated signal output from the transmission post-end unit and multiplexing it to output to the modulation / transmission unit.

The main system preferably includes a receiving / demodulating front end including some of the components of the receiving / demodulating part, and the subsystem further includes a receiving / demodulating back end including the remaining components of the receiving / demodulating part. .

The main system preferably includes a modulation / transmission front end including some of the components of the modulation / transmission section, and the subsystem further includes a modulation / transmission end section including the remaining components of the modulation / transmission section. .

The main system preferably includes a multiplexing front end including some of the components of the multiplexing unit, and the subsystem includes a multiplexing rear end including the remaining components of the multiplexing unit.

The reception / demodulation unit input frequency converter for converting the modulated signal received from the satellite and the base station to a predetermined frequency and outputs; An A / D converter for receiving the analog signal output from the input frequency converter and converting the digital signal to digital output; And a time multiple demodulator for receiving the digital signal output from the A / D converter and demodulating and outputting the demodulated signal in a time division multiple demodulation scheme.

The multiplexer may include a serial / parallel converter for converting the demodulated serial signal output from the time multiplexer into a parallel signal.

The main system may further include a code multiplex modulator for receiving the parallel signal output from the multiplexer and modulating the coded multiplex modulator in a code division multiple modulation scheme.

The transmission shear unit multiplexes and outputs a multiplexed signal for optical modulation; An optical modulator for optically modulating the input signal; And an optical modulator actuator for outputting a signal input from the multiplexer to the optical modulator and driving the optical modulator.

The optical demodulator for converting an optical signal received from the main system into an electrical signal and outputting the electrical signal; And a demultiplexer which receives a signal output from the optical demodulator, converts the signal into a code multiplexed signal, and outputs the converted signal.

The modulation / transmitting unit is a digital filter for digitally filtering the signal input from the transmission end; A D / A converter receiving the digital filtered signal output from the digital filter and converting the digital filtered signal into an analog signal; An output frequency converter which receives the digital signal output from the D / A converter and converts the digital signal into a predetermined frequency and outputs the converted frequency; And an amplifier for receiving and amplifying the signal output from the output frequency converter and transmitting the amplified signal to the mobile station and other repeaters.

The reception / demodulation unit comprises: an input frequency converter for converting and outputting the modulated signal received from the satellite and the base station to a predetermined frequency; An A / D converter for receiving the analog signal output from the input frequency converter and converting the digital signal to digital output; And an orthogonal frequency multiple demodulator for receiving the digital signal output from the A / D converter and demodulating and outputting the quadrature frequency multiple demodulation method.

An orthogonal frequency multiple demodulator for modulating the demodulated signal output from the orthogonal frequency multiple demodulator by an orthogonal frequency multiple modulation scheme and outputting the modulated signal to the transmission front end;

The reception / demodulation unit input frequency converter for converting the modulated signal received from the satellite and the base station to a predetermined frequency and outputs; An A / D converter for receiving the analog signal output from the input frequency converter and converting the digital signal to digital output; And an 8 VBS demodulator for receiving the digital signal output from the A / D converter and demodulating the 8 VBS demodulation method.

It is preferable to further include; 8VBS modulator for modulating the demodulated signal output from the 8VBS demodulator by the 8VBS modulation method to output to the transmission front end.

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

2 is a basic block diagram of a wireless relay system according to the present invention. As shown, the main system 320 of the wireless relay system 300 is located where it is easy to receive signals transmitted from the satellite / base station 200, and the subsystem 340 is physically connected to the main system 320. It is located in the shadowed area away from the main system 320 receives a signal transmitted from the mobile station / relay 400 in the shadowed area.

The reception / demodulation unit 322 of the main system 320 receives the modulated signal received from the satellite / base station 200, demodulates it again, and outputs the demodulated signal to the transmission shearing unit 330a. The transmission shearing unit 330a modulates the demodulated signal input from the receiving / demodulating unit 322 by various modulation methods such as optical modulation and transmits the modulated signal to the subsystem 340. The transmission post-end 330b of the subsystem 340 receives the modulated signal transmitted from the transmission pre-end 330a, demodulates it again, and outputs the demodulated signal to the modulation / transmitter 344. The modulator / transmitter 344 modulates the demodulated signal input from the transmit / receive end 330b by the modulation / demodulation method of the receiver / demodulator 322 and then amplifies and transmits the demodulated signal to the mobile station / relay device 400 in the shadow area. do.

3A to 3E are application examples of the basic structure of the present invention described above with reference to FIG. 2, and are various embodiments configured with different components included in the main system 320 and the subsystem 340.

FIG. 3A is a block diagram showing a first embodiment in which the subsystem 340 includes a multiplexer 342 for appropriately multiplexing signals output from the transmission end 330b of the subsystem 340.

3B includes a receiving / demodulating front end 322a for performing some functions of the receiving / demodulating unit 322 in the main system 320, and a receiving / demodulating back end 322b for performing the remaining functions. A configuration diagram showing a second embodiment included in 340.

3C includes a multiplexing end 342a for performing some functions of the multiplexing unit 342 in the main system 320, and a multiplexing end 342b for performing some other functions in the subsystem 340. FIG. Fig. 3 is a block diagram showing a third embodiment included in the figure.

3D is a configuration diagram illustrating a fourth embodiment including the multiplexer 342 in the main system 320.

3E includes a modulation / transmission front end 344a for performing some functions of the modulation / transmission section 344 in the main system 320, and a modulation / transmission end 344b for performing the remaining functions. A configuration diagram showing a fifth embodiment included in 340 is shown.

4A to 4B are detailed block diagrams of a wireless relay system supporting the System E standard among satellite broadcasting standards, and a block diagram showing another embodiment using the same.

As shown, the receiver / demodulator 322 includes an input frequency converter 522, an A / D converter 524, and a time multiplex demodulator 526. The input frequency converter 522 receives a signal modulated by the Ku-band time multiple modulation scheme received from the satellite / base station 200, converts the signal into a frequency suitable for reception, and outputs the signal to the A / D converter 524. The A / D converter 524 receives an analog signal output from the input frequency converter 522 and converts the analog signal into a digital signal and outputs it to the time multiplex demodulator 526. The time multiplexer 526 receives the digital signal output from the A / D converter 524 and demodulates the original signal before time multiplexing and outputs the demodulated signal to the multiplexer 342. The multiplexer 342 receives a serial signal output from the time multiplex demodulator 526, converts the serial signal into a parallel signal for code multiple modulation, and outputs the serial signal to the modulated transmission front end 344a. The modulated transmission shearing unit 344a receives the parallel signal output from the multiplexing unit 342 and modulates it in a code multiplexing manner and outputs it to the transmission shearing unit 330a. As shown, the transmission shearing unit 330a includes a multiplexer 530, an optical modulator actuator 532, and an optical modulator 534. The multiplexer 530 receives a code multiplexed signal output from the modulation / transmission front end 344a and performs multiplexing for optical transmission, and outputs the multiplexed signal to the optical modulator 532. The optical modulator actuator 532 receives the optical modulation multiplexed signal output from the multiplexer 530, outputs the signal to the optical modulator 534, and drives the optical modulator 534. The optical modulator 534 receives the optical modulated multiplexed signal output from the optical modulator actuator 532 and modulates the optical modulated signal and transmits the optical modulated signal to the sub-system 340 at a remote location using a transmission medium such as an optical cable. Post-transmission end 330b of subsystem 340 includes an optical demodulator 536 and a demultiplexer 538, as shown. The optical demodulator 536 receives the optically modulated signal transmitted from the optical modulator 534, and optically demodulates it and outputs the same to the demultiplexer 538. The demultiplexer 538 receives the optical demodulated signal output from the optical demodulator 536, demultiplexes the original code multiplexed signal, and outputs the demultiplexed signal to the post-modulation transmission end portion 344b. As shown, the modulation transmission end 344b includes a digital filter 544, a D / A converter 545, an output frequency converter 546, an amplifier 547, and a filter 548. The digital filter 544 receives the code multiplex signal output from the demultiplexer 538 and digitally filters the code multiplexed signal and outputs it to the D / A converter 545. The D / A converter 545 receives a digital signal output from the digital filter 544, converts the digital signal into an analog signal, and outputs the analog signal to the output frequency converter 546. The output frequency converter 546 receives an analog signal output from the D / A converter 545, converts the analog signal into a frequency for output, and outputs it to the amplifier 547. The amplifier 547 receives a signal output from the output frequency converter 546 and amplifies it and outputs it to the filter 548. The filter 548 receives the amplified signal output from the amplifier 547 and performs a final filtering process, and then sends it to the mobile station / relay device 400 in the shaded area.

4B is a system capable of transmitting signals from one main system 320 to multiple subsystems 340 and the corresponding mobile station / relay device 400 as shown in FIG. 4B. The optical modulator 532 and the optical modulator 534 of the configuration. The signal multiplexed in the multiplexer 530 so as to be suitable for light modulation is output to the first light modulation driver 532a and the second light modulation driver 532b, respectively. The first optical modulator and the second optical modulator corresponding thereto optically modulate the input multiplexed signals to transmit the first and second sub-systems 340a and 340b. The subsequent operation is the same as described above.

Figure 5a is a detailed block diagram of a wireless relay system supporting the System A standard. As shown, in the reception / demodulation unit 322, an orthogonal frequency multiple demodulator 527 of an orthogonal frequency multiple demodulation method supporting the system A standard instead of the time multiple demodulator 526 supporting the system E standard is provided. The transmitting end 345a performs an orthogonal frequency multiple modulation function. Operation of other components is the same as described above with reference to FIG.

FIG. 5B is a block diagram showing another embodiment of a wireless relay system supporting the System A standard, wherein a plurality of subsystems 340 and corresponding mobile stations / relays 400 from one main system 320 are shown. It is a relay system that can transmit a signal. As shown, the configuration of the transmission front end 330a is the same as described above in FIG.

6A is a detailed block diagram of a wireless relay system supporting the 8BVS standard used for digital TV broadcasting. As shown, the 8BVS demodulator 528 of the 8BVS demodulation method that supports the 8BVS standard instead of the time multiple demodulator 526 that supports the System E standard in the reception / demodulation unit 322, the 8BVS modulator 346a 8 Performs the BVS modulation function.
Operation of other components is the same as described above with reference to FIG. 4, and a detailed description thereof will be omitted.

FIG. 6B is a block diagram showing another embodiment of a wireless relay system supporting the 8BVS standard, wherein a plurality of subsystems 340 and a plurality of mobile stations / relays 400 corresponding thereto from one main system 320 are shown. It is a relay system that can transmit signals.
As shown, the configuration of the transmission front end 330a is the same as described above in FIG.

As described above, the present invention overcomes the feedback phenomenon occurring in the conventional relay system, and solves the problem of noise generation and installation operation, which is a problem of the separate relay device, thereby limiting the transmission power in the shadow area. And it provides an effect that can provide a high quality relay service without limiting the physical location of the transceiver.

Claims (17)

A wireless relay system for receiving and amplifying a modulated broadcast and communication signal transmitted from a satellite and a base station and transmitting the amplified signal to a mobile station or other repeater. The main system receives and demodulates the signals transmitted from the satellite and the base station, and amplifies and modulates the demodulated signal and transmits the modulated signal, and a modulated signal transmitted from the main system is physically installed at a predetermined distance from the main system. A subsystem for demodulating and transmitting to adjacent mobile stations or other relays, The main system, A receiver / demodulator for demodulating and outputting the modulated signal received from the satellite and the base station; And a transmission shear unit for receiving the demodulated signal output from the reception / demodulation unit and modulating it again to transmit the demodulated signal to a physically spaced position. The subsystem, A transmission post-end for receiving, demodulating and outputting the modulated signal transmitted from the main system; And a modulator / transmitter for receiving a demodulated signal outputted from the transmission post-end part, modulating the demodulated signal, and transmitting the modulated signal to the mobile station or another relay device. delete delete The system of claim 1, wherein the subsystem is: And a multiplexer for receiving a demodulated signal outputted from the transmission end part and multiplexing the demodulated signal to output the modulated / transmitter. The method of claim 4, wherein The main system includes a multiplexer front end including some of the components of the multiplexer, And the subsystem includes a multiplexer rear end including the remaining components of the multiplexer. The method of claim 1, The main system includes a reception / demodulation shear including some of the components of the reception / demodulation unit. The subsystem further comprises a receiving / demodulating back end including the remaining components of the receiving / demodulating part. The method of claim 1, The main system includes a modulation / transmission shear including some of the components of the modulation / transmission section, And the subsystem further comprises a modulation / transmission post-end including the remaining components of the modulation / transmission section. The method of claim 1, wherein the receiving / demodulating unit, An input frequency converter converting the modulated signal received from the satellite and the base station into a predetermined frequency and outputting the predetermined frequency; An A / D converter for receiving the analog signal output from the input frequency converter and converting the digital signal to digital output; And And a time multiple demodulator for receiving the digital signal output from the A / D converter and demodulating and outputting the demodulated signal in a time division multiple demodulation scheme. The method of claim 8, wherein the main system, And a serial / parallel converter for converting and outputting the demodulated serial signal output from the time multiple demodulator into a parallel signal. The method of claim 9, wherein the main system, And a code multiple modulator for receiving the parallel signal output from the serial / parallel converter and modulating and outputting the coded multiple modulation scheme. The method of claim 1, wherein the transmission shear section, A multiplexer for multiplexing and outputting the input signal in order to optically modulate the input signal; An optical modulator for optically modulating the input signal; And And an optical modulator actuator for outputting a signal input from the multiplexer to the optical modulator and driving the optical modulator. According to claim 1, The post-transmission end, An optical demodulator for converting an optical signal received from the main system into an electrical signal and outputting the electrical signal; And And a demultiplexer for receiving the signal output from the optical demodulator and converting the signal into a code multiplexed signal. The method of claim 1, wherein the modulation / transmission unit, A digital filter for digitally filtering the signal input from the transmission end; A D / A converter receiving the digital filtered signal output from the digital filter and converting the digital filtered signal into an analog signal; An output frequency converter which receives the digital signal output from the D / A converter and converts the digital signal into a predetermined frequency and outputs the converted frequency; And And an amplifier for receiving the signal output from the output frequency converter, amplifying the signal, and transmitting the amplified signal to the mobile station or another relay device. The method of claim 1, wherein the receiving / demodulating unit, An input frequency converter for receiving a modulated signal transmitted from the satellite and the base station and converting the modulated signal to a predetermined frequency and outputting the modulated signal; An A / D converter for receiving an analog signal output from the input frequency converter and converting the digital signal into a digital signal; And And an orthogonal frequency multiple demodulator for receiving the digital signal output from the A / D converter and demodulating and outputting the quadrature frequency multiple demodulation method. The method of claim 14, And an orthogonal frequency multiple demodulator for modulating the demodulated signal output from the orthogonal frequency multiple demodulator in an orthogonal frequency multiple modulation scheme and outputting the modulated signal to the transmission front end unit. The method of claim 1, wherein the receiving / demodulating unit, An input frequency converter for receiving a modulated signal transmitted from the satellite and the base station and converting the modulated signal to a predetermined frequency and outputting the modulated signal; An A / D converter for receiving an analog signal output from the input frequency converter and converting the digital signal into a digital signal; And And an 8 VBS demodulator for receiving the digital signal outputted from the A / D converter and demodulating and outputting the 8 VBS demodulation method. The method of claim 16, And an 8 VBS modulator for modulating the demodulated signal output from the 8 VBS demodulator in an 8 VBS modulation scheme and outputting the demodulated signal to the transmission front end.

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