KR20020057263A - Apparatus for adaptation interference controlling in mobile communication system - Google Patents

Abstract

PURPOSE: An adaptive interference controller of a mobile telecommunication system is provided to effectively remove noise by removing a noise signal through feedback and transforming a feedback principle used in a linear power amplifier system of a base station. CONSTITUTION: A signal conditioner(300) changes a transmitting signal output through a power amplifier into the same amplitude and phase with a leakage signal, and generates a signal always having the same amplitude and phase with the leakage signal according to a control signal generated from a synchronous detector(500). An error signal generator(400) subtracts the receiving signal from the signal generated at the signal conditioner(300) for outputting a difference signal as an error signal. The synchronous detector(500) mixes the error signal and a reference signal corresponding to the transmitting signal for detecting and outputting leakage signal removing value. A controller(600) controls the amplitude of the signal conditioner(300) by amplifying or reprocessing the leakage signal removing value, so that the controller(600) transmits a leakage signal removing signal to the signal conditioner(300).

Description

Apparatus for adaptation interference controlling in mobile communication system

The present invention relates to a control device capable of improving isolation performance between transmitters and receivers and improving noise figure performance by providing an adaptive interference controller in a terminal. In particular, the present invention relates to a feedback principle used in a base station. It is possible to implement a more efficient noise canceller by changing and applying it and replacing the duplexer of the RF front end with a control device that can cancel and cancel the noise signal. It can increase the efficiency of space clearance in the () and ease of component placement.

The noise figure refers to the ratio of the signal-to-noise (S / N) ratio between the input and the output when the signal is amplified by the amplifier, the smaller the value. The unit uses dB (decibels), ideally 0 dB (1 times: no degradation), and the noise figure (NF) is "(S / N of input signal)-(S / N of output signal). ) "(In dB).

In general, a duplexer (Duplexer) used in a portable communication terminal is mounted directly behind the antenna, and selectively connects the antenna to a transmitting circuit or a receiving circuit according to a transmission / reception situation. The duplexer is a kind of filter that, when transmitting, extracts only a specific frequency band from the transmitting circuit and passes through the antenna, and when receiving, extracts only a specific frequency band from various frequencies received from the antenna and passes through the receiving circuit. It separates the receiving frequency from the receiving antenna and makes it possible to transmit / receive with one antenna.

The duplexer is a patterned printed circuit board (abbreviated as "PCB"), the receiving terminal and the resonator (Resonator) and capacitor (Capacitor) of the receiver, the transmitting terminal and the resonator (Inductor), Antenna terminals and the like.

In the above description, a resonator is a device that increases resonance of a sound by using resonance or resonance, absorbs sound or vibration, and uses the device for frequency analysis or the like which resonates mechanically or electrically by electric vibration of a certain frequency. Refers to a circuit element.

Looking at the configuration of a base station high frequency processing apparatus in a general mobile communication system having such a duplexer as follows.

1 is a block diagram illustrating a configuration of a high frequency processing apparatus of a base station in a general mobile communication system.

Here, reference numeral 101 is an up-converter for up-converting the transmission signal to high frequency, 102 is a variable attenuator for variably attenuating the high-frequency up-converted by the up-converter 101, and 103 is the variable attenuator 103. A power amplifier for power amplifying the high frequency output from the 104, the output signal of the power amplifier 103 is a path to the antenna side, the signal received from the antenna side is a duplexer 104 to set the path to the receiving side 105 is a coupler for connecting the transmission signal through the duplexer 104 to the antenna side and simultaneously feedback a signal corresponding to the level of the transmission frequency, and 106 is for detecting the power of the transmission signal fed back from the coupler 105. Transmission level detector.

Further, reference numeral 107 denotes a first unit for transmitting the transmission power detected by the transmission level detector 106 to the main base station and controlling the variable attenuator 102 and the power amplifier 103 according to a control signal transmitted from the main base station. 1 is a modem, 108 is a low noise amplifier for low noise amplification of the received signal through the duplexer 104, 109 is a mixture of the output signal of the low noise amplifier 108 and the signal output from the first modem (107) The frequency transmitted from the main base station is a first diplexer that separates the received signal and the control signal.

In addition, reference numeral 110 denotes a first signal that separates the signal output from the first diplexer 109 into a received signal and a detection signal, and transmits a control signal output from the main modem to the first diplexer 109. A second diplexer, 111 is a second diplexer 110 which transmits a detection signal obtained from the second diplexer 110 to a base station manager, and a second signal which transmits a control signal obtained from the base station manager to the second diplexer 110; Modem, 112 is a power divider for power distribution of the received signal obtained from the second diplexer 110, 113, 114 is a frequency down conversion of the received signal distributed in the power divider 112 to the intermediate frequency, respectively First and second down converters.

The variable attenuator 102, the high power amplifier 103, the duplexer 104, the coupler 105, the transmit level detector 106, the first modem 107, the low noise amplifier 108, and the first diplexer. 109 is actually implemented on one board, which is collectively referred to as a high frequency front end block.

The high frequency processing apparatus of the base station configured as described above is largely operated by a high frequency transmission process, a control (variable attenuator and a high power amplifier) process, and a transmission level detection process. Hereinafter, each process as described above will be described separately.

First, referring to the high frequency transmission process, the transmission signal is up-converted to the high frequency in the up converter 101, attenuated according to the attenuation level set in the variable attenuator 102, and then amplified by the high power amplifier 103. The power amplified transmission signal is connected to the transmission path through the duplexer 104, and is connected to the transmission antenna through the coupler 105 which is a directional coupler.

Next, referring to the transmission level detection process, when the transmission level detection command is issued by the base station manager BSM, the second modem 111 converts the signal into an analog signal and transmits the analog signal to the second diplexer 110. The second diplexer 110 transmits the transmitted control command to the first diplexer 109, and the first diplexer 109 transmits the control command to the first modem 107. In this case, the transmission level detector 106 detects a transmission level obtained from the coupler 105 and transmits the transmission level to the first modem 107, and the first modem 107 converts it into an analog signal and converts the signal into an analog signal. To pass). The first diplexer 109 combines the transmission level detection signal and the reception signal and transfers the received signal to the second diplexer 110. The second diplexer 110 transmits the reception signal and the transmission level detection signal. The distribution signal is transmitted to the power divider 112 and the transmission level detection signal is transmitted to the second modem 111. The second modem 111 converts it into a digital signal and delivers it to the base station manager BSM, which is an upper block.

Next, the control (variable attenuator and high power amplifier) processing process is as follows.

First, the control of the variable attenuator 102 analyzes the transmission level in the base station manager BSM and transmits the control value to the second modem 111 as described above. The second modem 111 converts it into an analog signal and transmits it to the second diplexer 110. The second diplexer 110 transmits the transmitted control command signal to the first diplexer 109, and the first diplexer 109 transmits it to the first modem 107. The first modem 107 sets the attenuation value of the variable attenuator 102 according to the transmitted control command value, thereby controlling the variable attenuator 102.

However, since the conventional base station apparatus operated as described above is implemented separately for each module that processes high frequency (RF), it has a disadvantage of occupying a large size of the apparatus.

In addition, the duplexer for the portable communication terminal as described above generates a coupling phenomenon due to frequency interference between the resonators of the transmitter / receiver. That is, an abnormal frequency is generated at the end of the transmit / receive frequency band, thereby degrading the filter characteristics of the duplexer, and the duplexer for the portable communication terminal is connected to one side of the PCB by connecting the resonators of the transmitting / receiving unit in a line. The efficiency of freeing up space on the main PCB is low, which causes the size of the component to increase.

Accordingly, the present invention is proposed to solve the above problems of the prior art,

An object of the present invention is to reduce the insertion loss and improve the noise figure by using a reception band filter having a better insertion loss performance than the duplexer by canceling and canceling a noisy signal. An adaptive interference control apparatus is provided.

The present invention for achieving the above object,

A signal conditioner for changing a transmission signal output through the power amplifier to the same amplitude and phase as the leakage signal and generating a signal having the same amplitude and phase as the leakage signal according to a control signal;

An error signal generator for subtracting the signal generated from the signal generator and the received signal and outputting the difference signal as an error signal;

A synchronous detector for detecting a leakage signal cancellation value by mixing an error signal output from the error signal generator and a reference signal corresponding to a transmission signal;

It is characterized in that it is configured as a controller for amplifying and reprocessing the leakage signal cancellation value output from the synchronization detector and transmitting the leakage signal removal signal to the signal generator.

1 is a block diagram showing the configuration of a high frequency processing apparatus of a base station in a general mobile communication system,

2 is an operation configuration diagram of an adaptive interference control apparatus according to the present invention,

3 is a configuration diagram showing the detailed structure of the signal generator according to FIG.

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

200 ..... Band Pass Filter (BPF)

300 ..... Signal Conditioner

310, 330 ..... First and second hybrid coupler

321, 322 ..... First and second variable attenuators

400 ..... Error signal generator

500 ..... Synchronous Detector

600 ..... Controller

Hereinafter, a preferred embodiment of an adaptive interference control apparatus for a mobile communication system according to the present invention will be described in detail with reference to the accompanying drawings.

2 is an operational configuration diagram of an adaptive interference control apparatus according to the present invention.

As shown therein, an antenna for receiving the transmission signal, a band pass filter (BPF) 200 for receiving the reception signal from the antenna and outputting the signal at a specific bandwidth, and changing the transmission signal to the same amplitude and phase as the leakage signal A signal generator 300 for subtracting the signal generated from the signal generator 300 and an received signal and outputting the received signal as an error signal, and tracking the amplitude and phase of the leakage signal. A synchronization detector 500 for controlling 300 and a controller 600 for controlling the output of the synchronization detector 500 are configured.

In this case, when the signal output through the power amplifier (not shown) leaks into the reception path, a non-noise characteristic may occur in the low noise amplifier (not shown) on the receiver. Thus, when a loop is formed in the receiver path, the loop gain ( Loop Gain) is set to "1" or less, and is designed so that it does not enter the amplifier in phase. In other words, noise generated in phase reduces its amplitude by feedback to the loop.

In addition, since the leakage signal may always change in amplitude and phase, after performing a tracking function while generating a counter signal, the next fixed sign extension character may appear for the locking and sign extension character. Until all of the encoded representations following this character, or of varying interpretation of the representation, are performed.

Referring to the operation of the adaptive interference control device having such a configuration as follows.

The signal conditioner 300 changes the transmission signal output through the power amplifier (not shown) to the same amplitude and phase as the leakage signal, that is, generates a condition for removing the leakage signal. In accordance with the control signal generated by the synchronous detector 500, the signal having the same amplitude and phase as the leakage signal is always generated.

Next, the error signal generator 400 subtracts the signal generated from the signal generator 300 and the received signal, outputs the difference signal as an error signal, and the synchronization detector 600 outputs the error signal generator 400. The error signal outputted from the mixed with the reference signal corresponding to the transmission signal to detect the leakage signal cancellation value and outputs.

Here, the difference between the leakage signal and the signal generated by the signal generator 300 is called an error signal, and the signal on the path through which the transmission output signal is input to the synchronization detector 500 is called a reference signal. In this case, since the frequency of the reference signal and the error signal is the same, the output of the mixer 510 is output by direct current (DC), and the amplitude of the reference signal is fixed by the property of the mixer 510. In this case, the direct current (DC) value of the mixer 510 is proportional to the amplitude of the error signal.

Next, the controller 600 controls the amplitude of the signal generator 300 by amplifying and reprocessing the leakage signal cancellation value output from the sync detector 500 to thereby provide the signal generator 300 with the leakage signal removal signal. Deliver it.

FIG. 3 is a block diagram illustrating a detailed structure of a signal generator according to FIG. 2.

As shown therein, the first and second hybrid couplers 310 and 330 which connect the transmission signal to the antenna side and simultaneously feedback the corresponding signal of the transmission frequency to change the phase of the signal, and the high frequency And a first and second variable attenuators 321 and 322 to variably attenuate and adjust the amplitude.

The operation of the signal generator having such a configuration will be described below.

First, the first hybrid coupler 310 receives a leakage signal corresponding to a transmission signal from an antenna and a leakage signal removal signal (control signal) input from the controller 600, and outputs the phase of these signals by changing the phase. The variable attenuator 320 receiving the phase-converted signal variably attenuates a frequency corresponding to the input signal to output an amplitude. Next, the second hybrid coupler 330 verifies the integrity of the data output from the variable attenuator 320 and combines two signals output from the first and second variable attenuators 321 and 322 into one. Output to generator 400.

According to the present invention "adaptation interference control device in a mobile communication system" described above, by reducing the noise signal by feedback, by modifying the feedback (Feedback) principle used in the linear power amplifier system of the base station This has the advantage of making noise removal more effective.

In addition, by replacing the expensive duplexer in the terminal, the efficiency of securing space on the PCB and ease of component placement is increased, and the component size of the device is also reduced.

Claims (4)

An adaptive interference control device having a power amplifier, A signal conditioner for changing the transmission signal output through the power amplifier to the same amplitude and phase as the leakage signal and generating a signal having the same amplitude and phase as the leakage signal according to a control signal; An error signal generator for subtracting the signal generated from the signal generator and the received signal and outputting the difference signal as an error signal; A synchronous detector for detecting a leakage signal cancellation value by mixing an error signal output from the error signal generator and a reference signal corresponding to a transmission signal; And a controller for amplifying and reprocessing the leakage signal cancellation value output from the synchronization detector to transmit the leakage signal removal signal to the signal generator. The method of claim 1, wherein the signal generator, A first hybrid coupler that receives a leakage signal from the antenna and a control signal input from the controller, and varies the phase of the signal and outputs the first hybrid coupler, and receives the phase shifted signal and variably attenuates a frequency corresponding to the signal. First and second variable attenuators for adjusting and outputting amplitude, verifying the integrity of data output from the variable attenuator, and combining the two signals output from the first and second variable attenuators into one and outputting them to an error signal generator. Adaptive interference control device in a mobile communication system comprising a second hybrid coupler. 3. The movement according to claim 1 or 2, wherein the error signal generator comprises a subtraction subtracting a signal generated by the signal generator and a received signal and outputting the difference signal as an error signal. Adaptive interference control device in communication system. The method of claim 1, wherein the sync detector, When the difference between the leakage signal and the signal generated by the signal generator is an error signal and a signal on the path through which the transmission output signal is input to the synchronization detector is a reference signal, the frequency of the reference signal and the error signal In the same way, when the output of the mixer is output to direct current (DC), and the amplitude of the reference signal is fixed by the property of the mixer, the DC value of the mixer is proportional to the amplitude of the error signal. Adaptive interference control device in a mobile communication system.