KR20050009002A - Mobile communication relay system and method sharing power amplifier and low noise amplifier - Google Patents

Abstract

PURPOSE: A mobile communication relay system using a transceiving PA(Power Amplifier) and an LNA(Low Noise Amplifier) is provided to share an LNA as a receiver and a PA as a transmitter for forward/reverse links, thereby enabling a stable service supply. CONSTITUTION: The third duplexer combines a forward signal received through the first duplexer(207) with a reverse signal received through the second duplexer(221), and simultaneously transmits the combined signals to an LNA(209). The LNA(209) amplifies the forward/reverse signals. A 2-way divider(211) separates the amplified forward and reverse signals. A down-up converter(212) extracts the forward and reverse signals, respectively. A 2-way combiner(217) combines the separated forward signal with the reverse signal. A PA(219) amplifies the combined forward/reverse signals. The fourth duplexer separates the forward signal from the reverse signal, and transmits the separated signals to the first and second duplexers(207,221).

Description

Mobile communication relay system using a power amplifier for transmission and reception and a low noise amplifier {mobile communication relay system and method sharing power amplifier and low noise amplifier}

The present invention relates to a transmission and reception power amplifier and a low noise amplifier common method, and more particularly, a low noise amplifier (LNA) which is a receiver of a relay system for mobile telephone service and a power amplifier (PA) which is a transmitter. The present invention relates to a transmission and reception power amplifier and a low noise amplifier common method and apparatus for providing a stable service by sharing the s in forward and reverse directions.

In a mobile communication system, a base station, a terminal that communicates with another mobile communication terminal through the base station, and a repeater interposed between the base station and the terminal to perform a relay role perform mutual data communication.

In the above, the repeater re-amplifies the signal of the base station mainly to cover the partial shadow area caused by the lack of the electric field strength, and is installed and operated between the path of the CDMA base station and the CDMA terminal, and operates between the base station and the terminal. It is a device that amplifies a wireless path to finally provide a shadow area call of a service subscriber.

In general, wireless signal transmission and reception methods are divided into analog and digital methods, and digital wireless signal transmission and reception methods are used according to the rapid development of technology. A representative example of the digital method is a code division multiple access (CDMA) method.

1 is a diagram showing the configuration of a conventional CDMA / WCDMA relay system.

Referring to FIG. 1, in a relay system of a conventional code division multiple access (CDMA) scheme and a wideband code division multiple access (WCDMA) scheme, a forward link is used in a forward link. A low noise amplifier 107 and a power amplifier 123 are configured separately, and a low noise amplifier 123 and a power amplifier for reverse in the reverse link are also included. 123 is separately configured to constitute the entire relay system.

The forward variable attenuator VA1 109 and the reverse variable attenuator VA2 125 are controlled by the main processor 121 based on the value measured by the power detector PD. Keep the output value constant.

First, a description of the forward signal processing in the CDMA / WCDMA relay system is as follows.

The signal received through the antenna 101 is separated by a directional coupler (DC2) 103 to a low noise amplifier for forward link (107) through a duplexer (105). To pass. A low noise amplifier for forward link 107 performs low noise amplification of the received signal and filters the extracted signal to extract only a signal of a used band.

A variable attenuator (VA) 109 attenuates the power of the amplified signal and transmits the attenuated signal to a power amplifier for forward link 111.

The power amplified signal through the power amplifier for forward link (111) 111 is transmitted to the Duplexer (113) and the directional coupler (DC1) (115) and then the antenna 117 It is sent through.

Here, the directional couplers (DC) 103 and 115 are devices which provide two paths for receiving a signal at a high frequency (RF) input and transmitting the signal to another device. It is a device to separate a part of.

Duplexers 105 and 113 protect the receiver from transmission outputs when transmitting one antenna 101 and 117 for joint use in transmission and reception, and supply echo signals to the receiver when receiving. Device.

Low Noise Amplifiers (LNAs) 107 and 127 are high-frequency amplifiers designed to lower the noise figure of the entire receiver, and are used for receiving radio waves with a small input voltage, such as communication lines having a large propagation loss. . There are a parameter amplifier, a low noise transistor amplifier, a major, and the like. Recently, with the development of semiconductor technology, room temperature parametric amplifiers, GaAs, field effect transistors (FETs), and the like are used.

Variable Attenuators (VAs) 109 and 125 are four-terminal networks used to attenuate input signal power and include a resistor-only resistor attenuator and a reactance attenuator in combination of a coil and a capacitor.

The power amplifiers (PA) 111 and 123 are terminal amplifiers using a power pipe, and a radio frequency amplifier (RF amplifier) for supplying power to an antenna system as a transmitter is called a terminal power amplifier. . Depending on the frequency handled, it is classified into a low frequency power amplifier and a high frequency power amplifier.

Next, a reverse signal processing procedure in a CDMA / WCDMA relay system will be described.

The signal received through the antenna 117 is separated by a directional coupler (DC1) 115 to a Low Noise Amplifier for Reverse Link 127 through a Duplexer 113. To pass.

A low noise amplifier for reverse link 127 amplifies the received signal and filters the extracted signal to extract only a signal of a used band. A variable attenuator (VA) 125 attenuates the power of the amplified signal and transfers the amplified signal to a power amplifier for reverse link (123).

The power amplified signal through the power amplifier for reverse link (123) 123 is transmitted to the Duplexer 105 and the directional coupler (DC1) 103 and then the antenna 101 It is sent through.

However, the size of the transmit / receive output of a power amplifier (PA), which is an essential element of a relay system for mobile phone service, is at least 10 dB. Also, the degree of link unbalance in the forward and reverse directions due to the decrease in gain of the PA is not related to the magnitude of the output of the PA. When using AGC (Automatic Gain Control) of equipment operating in the field, it is essential that the forward and reverse gains must match the values in software and actual hardware, but because the temperature characteristics of each device inside the equipment are different, The gain mismatch in the reverse direction must occur to some extent.

Here, an automatic gain controller (AGC) is a device that automatically adjusts gain so that the amplitude of the output signal is kept constant by detecting the amplitude variation of a wireless receiver or amplifier input signal. This method is often operated by using a direct current component in the output as a control voltage so that the gain becomes constant. In general, a part of the output voltage is fed back to the ultra-short amplification unit to control gain and is also used as an automatic volume control (AVC).

Accordingly, an object of the present invention is to share a low noise amplifier (LNA), a receiver, and a power amplifier (PA), a transmitter, in the forward and reverse directions of a relay system for a mobile phone service. The present invention provides a method and apparatus for transmitting and receiving power amplifiers and low-noise amplifiers that enable stable service compared to use.

Another object of the present invention is to share a low noise amplifier (LNA) and a power amplifier (PA) in the forward and reverse directions so that a simple automatic gain controller (AGC) can be used for forward and reverse directions. The present invention provides a method and apparatus for transmitting and receiving power amplifiers and low noise amplifiers that provide sufficient balance of gain and output to enable stable service.

1 is a diagram showing the configuration of a conventional CDMA / WCDMA relay system.

2 is a diagram illustrating a configuration of a CDMA / WCDMA relay system sharing a power amplifier and an LNA according to an embodiment of the present invention.

3 is a flowchart illustrating a forward and reverse signal processing procedure in a CDMA / WCDMA relay system sharing a power amplifier and an LNA according to an embodiment of the present invention.

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

107: low noise amplifier (LNA for Forward Link)

127: LNA for Reverse Link

111: Power Amplifier for Forward Link

123: Power Amplifier for Reverse Link

101, 117, 201, 231: antenna

103, 115, 203, 225, 207, 221: Directional coupler

105, 113, 205, 223: Duplexer

209: Low Noise Amplifier (LNA)

211: 2Way Divider

212: Down Up Converter

109, 213: variable damper for forward

125, 215: variable attenuator for reverse direction

217: 2Way Combiner

219: power amplifier (PA)

119, 227: Power Detector (PD)

121, 229: main processor

According to an aspect of the present invention for achieving the above objects, a first handset, a second handset in a mobile communication relay system configured to share a low noise amplifier (LNA) and a power amplifier (PA) in the forward link and the reverse link A third handset for synthesizing the forward signal received through the switch, the first handset and the reverse signal received through the second handset, and simultaneously delivering the signal to the low noise amplifier; A low noise amplifier for low noise amplifying a reverse signal, a 2 way divider for separating the forward and reverse signals amplified by the low noise amplifier into a predetermined signal size, a down-up converter for extracting a forward signal and a reverse signal from each of the signals separated by the 2 way divider; 2Way to synthesize the forward and reverse signals separated by the down-up converter Provides a mobile communication relay system comprising a synthesizer, a power amplifier for amplifying the synthesized forward and reverse signals, and a fourth handset for separating the forward and reverse signals to the first handset and the second handset. can do.

The apparatus may further include a forward attenuator for attenuating the power of the forward signal separated by the down-up converter and a reverse attenuator for attenuating the power of the reverse signal separated by the down-up converter.

The controller may further include a controller configured to continuously control the forward attenuator and the reverse attenuator based on a value measured by a power detector (PD) to maintain a desired output value.

According to another aspect of the present invention for achieving the above object, a mobile communication relay system configured to share a low noise amplifier (LNA) in the forward link and the reverse link, the first handset, the second handset, the first handset A third handset for synthesizing the forward signal received through the switch and the reverse signal received through the second handset and simultaneously transmitting the signal to the low noise amplifier; and low noise amplifying the forward and reverse signals transmitted through the third handset A low noise amplifier, a 2W divider for separating the forward and reverse signals amplified by the low noise amplifier into a predetermined signal size, a down-up converter for extracting a forward signal and a reverse signal from each of the signals separated in the 2Way divider, and by the down-up converter Forward power amplifier and the down for amplifying the separated forward signal It is possible to provide a mobile communication system including a relay for reverse power amplifier for amplifying the uplink signal separated by the converter.

A forward attenuator for attenuating the power of the forward signal separated by the down-up converter, a reverse attenuator for attenuating the power of the reverse signal separated by the down-up converter, and a value measured by a power detector (PD) The control unit may further include a control unit for controlling the forward attenuator and the reverse attenuator based on the control unit so as to continuously maintain a desired output value.

According to another aspect of the present invention for achieving the above object, a mobile communication relay system configured to share a power amplifier (PA) in the forward link and the reverse link, the first handset, the second handset, the first handset A low noise amplifier for forward, low noise amplifying the forward signal transmitted from the handset, a low noise amplifier for low noise amplifying the backward signal transmitted from the first handset, a 2 way synthesizer for synthesizing the forward and reverse signals, the synthesized A mobile communication relay system including a power amplifier for simultaneously amplifying a forward and reverse signal and a third handset for separating the forward and reverse signals and transmitting the split signal to the first handset and the second handset.

A forward attenuator for attenuating the power of the forward signal amplified by the forward low noise amplifier, a reverse attenuator and a power detector (PD) for attenuating the power of the reverse signal amplified by the backward low noise amplifier The controller may further include a controller configured to control the forward attenuator and the reverse attenuator based on a value so as to continuously maintain a desired output value.

According to another aspect of the present invention to achieve the above object, to provide a mobile communication relay service in a mobile communication relay system configured to share a low noise amplifier (LNA) and a power amplifier (PA) in the forward link and the reverse link In this case, the forward and reverse signals received through the antenna are synthesized and simultaneously transmitted to the low noise amplifier, the forward and reverse signals are low noise amplified by the low noise amplifier, and the forward and reverse signals amplified by the low noise amplifier are Separate into a predetermined signal magnitude, extract forward and reverse signals from each of the separated signals, convert power levels of the extracted forward and reverse signals, synthesize the converted forward and reverse signals, and The synthesized forward and reverse signals are amplified by the power amplifier The mobile communication relay method may separate the amplified forward and reverse signals and transmit the separated amplified forward and reverse signals through the corresponding antennas.

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating a configuration of a CDMA / WCDMA relay system sharing a power amplifier and an LNA according to an embodiment of the present invention.

Referring to FIG. 2, a relay system of a code division multiple access (CDMA) scheme and a wideband code division multiple access (WCDMA) scheme according to the present invention includes antennas 201 and 231 for transmission and reception. ), Directional couplers 203 and 225, duplexers 205 and 223, power detectors 227, main processors 229, forward variable attenuators And an Attenuator for Forward Link 213, a Variable Attenuator for Reverse Link 215, and the like.

In addition, the relay system of the present invention is a separate handset switcher D1 (duplexer) 207 and D2 (duplexer) 221, a transmission and reception common low noise amplifier (LNA: Low Noise Amplifier (LNA) 209, power transmission and reception common power amplifier (Power Amplifier) ) 219, a 2Way divider 211, a down-up converter 212, and a 2Way combiner 217.

The forward signal and the reverse signal flowing into the forward / reverse link are simultaneously input to the D1 207 which is a separate duplexer. When the D1 207 combines the forward and reverse signals simultaneously input to the low noise amplifier (LNA) 209, the low noise amplifier (LNA) 209 transmits the forward and reverse signals. At the same time, low-noise amplification is delivered to the 2Way distributor 211.

When the 2Way divider 211 receives the amplified forward and reverse signals and separates them into signal units of a predetermined unit, the down-up converter 212 separates the forward and reverse signals from each of the separated signals to forward each signal. To the variable attenuator 213 and the reverse variable attenuator 215.

Each of the forward variable attenuator 213 and the reverse variable attenuator 215 properly converts the powers of the forward and reverse signals, sums the signals in the 2-way synthesizer 217 to simultaneously transmit and receive signals at the common PA 219 stage. Amplify.

The amplified signal is separated from the D2 221 which is a separate duplexer, and is transmitted to the transmission / reception switcher 1 205 and the transmission / reception switcher 2 223 through respective band pass filters to transmit and receive antennas ( By transmitting signals to the base station (not shown) and the terminal (not shown) through the 201 and 231, to provide a stable service.

3 is a flowchart illustrating a process of forward and reverse signal processing in a CDMA / WCDMA relay system sharing a power amplifier and an LNA according to an exemplary embodiment of the present invention.

Referring to FIG. 3, when receiving a forward signal and a reverse signal through the dual transmit / receive antennas 201 and 231 (S301), the low noise amplifier 209 transmits the forward signal and the reverse signal through separate handset converters (D1) 207. To pass).

The low noise amplifier 209 simultaneously amplifies the forward signal and the reverse signal at low noise (S303) to separate and amplify the low noise amplified forward and reverse signals through the 2Way divider 211 and the down-up converter (S305).

The separated and amplified forward and reverse signals are converted into appropriate power by the forward variable attenuator 213 and the reverse variable attenuator 215 (S307), and then synthesized by the 2Way synthesizer 217 (S309).

The forward / reverse signal synthesized by the 2-way synthesizer 217 is amplified by the power amplifier 219 (S311), and then separated by a separate handset (D2) 221 (S313) to transmit / receive an antenna ( Through the 201 and 231 is transmitted to the base station (not shown) and the terminal (not shown) (S315).

The present invention is not limited to the above embodiments, and many variations are possible by those skilled in the art within the spirit of the present invention.

As described above, according to the present invention, a low noise amplifier (LNA), which is a receiver of a relay system for a mobile telephone service, and a power amplifier (PA), which is a transmitter, are shared in the forward and reverse directions so that a separate Compared to the case of using the device, it is possible to provide a method and apparatus for transmitting and receiving power amplifiers and low-noise amplifiers that enable reliable service.

In addition, according to the present invention, a low noise amplifier (LNA) and a power amplifier (PA) are shared in the forward and reverse directions so that a simple automatic gain controller (AGC) can be used for forward and reverse directions. It is possible to provide a method and apparatus for transmitting and receiving power amplifiers and low noise amplifiers that maintain a sufficient balance of gain and output to enable stable service.

Claims (8)

A mobile communication relay system configured to share a low noise amplifier (LNA) and a power amplifier (PA) in a forward link and a reverse link, A first handset diverter; A second handset diverter; A third handset for synthesizing the forward signal received through the first handset and the reverse signal received through the second handset and simultaneously delivering the signal to the low noise amplifier; A low noise amplifier for low noise amplifying the forward and reverse signals transmitted through the third handset; A 2Way divider for separating the forward and reverse signals amplified by the low noise amplifier into a predetermined signal size; A down-up converter for extracting a forward signal and a reverse signal from each of the separated signals in the 2Way divider; A 2Way synthesizer for synthesizing the forward and reverse signals separated by the down-up converter; A power amplifier for amplifying the synthesized forward and reverse signals; And A fourth handset for separating the forward and reverse signals and transmitting the first and second handsets Mobile communication relay system comprising a. The method of claim 1, A forward attenuator for attenuating the power of the forward signal separated by the down up converter; And Reverse attenuator for attenuating the power of the reverse signal separated by the down-up converter The mobile communication relay system further comprises. The method of claim 2, Control unit for continuously maintaining the desired output value by controlling the forward attenuator and the reverse attenuator based on the value measured by a power detector (PD) The mobile communication relay system further comprises. A mobile communication relay system configured to share a low noise amplifier (LNA) in a forward link and a reverse link, A first handset diverter; A second handset diverter; A third handset for synthesizing the forward signal received through the first handset and the reverse signal received through the second handset and simultaneously delivering the signal to the low noise amplifier; A low noise amplifier for low noise amplifying the forward and reverse signals transmitted through the third handset; A 2Way divider for separating the forward and reverse signals amplified by the low noise amplifier into a predetermined signal size; A down-up converter for extracting a forward signal and a reverse signal from each of the separated signals in the 2Way divider; A forward power amplifier for amplifying the forward signal separated by the down-up converter; And Reverse power amplifier for amplifying the reverse signal separated by the down-up converter Mobile communication relay system comprising a. The method of claim 4, wherein A forward attenuator for attenuating the power of the forward signal separated by the down up converter; A reverse attenuator for attenuating the power of the reverse signal separated by the down up converter; And Control unit for continuously maintaining the desired output value by controlling the forward attenuator and the reverse attenuator based on the value measured by a power detector (PD) The mobile communication relay system further comprises. A mobile communication relay system configured to share a power amplifier (PA) in a forward link and a reverse link, A first handset diverter; A second handset diverter; A low noise amplifier for forward noise amplifying the forward signal transmitted from the first handset; A low noise amplifier for reverse noise amplifying the reverse signal transmitted from the first handset; A 2Way synthesizer for synthesizing the forward and reverse signals; A power amplifier for simultaneously amplifying the synthesized forward and reverse signals; And A third handset which separates the forward and reverse signals and transmits the first and second handsets Mobile communication relay system comprising a. The method of claim 6, A forward attenuator for attenuating the power of the forward signal amplified by the forward low noise amplifier; A reverse attenuator for attenuating the power of the reverse signal amplified by the reverse low noise amplifier; And Control unit for continuously maintaining the desired output value by controlling the forward attenuator and the reverse attenuator based on the value measured by a power detector (PD) The mobile communication relay system further comprises. A method for providing a mobile communication relay service in a mobile communication relay system configured to share a low noise amplifier (LNA) and a power amplifier (PA) in a forward link and a reverse link, the method comprising: Synthesizing the forward signal and the reverse signal received through the antenna and simultaneously transmitting the synthesized signals to the low noise amplifier; Low noise amplifying the forward and reverse signals by the low noise amplifier; Separating the forward and reverse signals amplified by the low noise amplifier into a predetermined signal magnitude; Extracting a forward signal and a reverse signal from each of the separated signals; Converting power levels of the extracted forward and reverse signals; Synthesizing the converted forward and reverse signals; Amplifying the synthesized forward and reverse signals by the power amplifier; And Separating the amplified forward and reverse signals and transmitting the signals through the corresponding antennas Mobile communication relay method comprising a.