KR100757304B1 - Detecting and canceling method of unwanted PN code and signal processing device thereof - Google Patents

Abstract

The present invention relates to a signal processing method and apparatus of a communication system, and more particularly, after converting an RF signal received from a base station or a communication system into digital and identifying a pseudo noise code of the RF signal by a digital signal processor. The present invention relates to a method for identifying and removing an unnecessary pseudo noise code capable of transmitting a good signal by improving communication quality by removing unnecessary pseudo noise signals and a signal processing device using the same.

As a signal processing device of a wireless communication system according to the prior art, a repeater for receiving an RF signal from a base station and retransmitting it to a shadow area includes a plurality of unnecessary signals not intended from other base stations or terminals in addition to the signal of a base station to be retransmitted through a receiving antenna. Is mixed or the signal transmitted to the transmitting antenna is fed back, the communication quality is very poor due to this multiple interference signal.

The present invention is to solve the problems of the prior art as described above, the repeater converts the RF signal received from the base station or communication system to digital and then transmits the pseudo-noise code of the base station signal to be retransmitted by the digital signal processor The present invention provides a method for improving communication quality by identifying and removing other signals and a signal processing device using the same.

Description

Detecting and canceling method of unwanted PN code and signal processing device

1 is a schematic diagram showing a base station environment in which a general relay is installed.

2 is a view showing a signal transmission and reception state of the relay device of FIG.

3 is a block diagram of an interference cancellation system according to the prior art.

4 is a block diagram illustrating the use of a signal processing apparatus for identifying and eliminating unnecessary pseudonoise codes in accordance with the present invention.

5 is a block diagram illustrating the unnecessary pseudonoise code identification and removal algorithm of FIG.

6 is a block diagram showing a state in which a plurality of signal processing apparatuses of FIGS. 4 and 5 are configured.

7 is a diagram illustrating removal of a pseudo noise code of a relay device according to the prior art and the present invention;

8 and 9 are block diagrams of relay apparatuses using signal processing apparatuses for identifying and eliminating unnecessary pseudonoise codes in accordance with the present invention.

* Explanation of symbols for the main parts of the drawings

100. Repeater 101, 401. Receive Antenna

102, 415. Transmit antenna 103. Amplifier

104. Signal distribution means 105. Phase shifter

106. Attenuator 107. Delay line

108. Signal synthesizing means 301, 501. A / D converter

302. Digital signal processor 303, 503. D / A converter

402. Receive Band Filter 403. Low Noise Amplifier

404. First Mixer 405. SAW Filter

406. First Amplifier 407. First Attenuator

408. Oscillator 409. Second Amplifier

410. Low Pass Filter 411. Second Attenuator

412. Second Mixer 413. Power Amplifier

414. Transmit Band Filter

502, 502-1, 502-2. First to Third Digital Downconverters

504, 504-1. First and Second PN Detectors 505. PN Generator

506, 506-1, 506-2, 506-3, 506-4. First to fifth PN information controller

507, 507-1, 507-2, 507-3, 507-4. 1st to 5th PN Tracker

508, 508-1, 508-2, 508-3, 508-4, 508-5, 508-6, 508-7. First to Eighth Sum / Subtractor

509, 509-1. First and Second Digital Upconverters

510. Band filtering unit

520, 520-1, 520-2, 520-3. First to fourth PN removal circuit parts

530. PN removal monitoring unit 601. First duplexer

602. First low noise amplifier 603. First power amplifier

604. Second duplexer 605. Second low noise amplifier

606. Second power amplifier 607. Transmission line

The present invention relates to a signal processing method and apparatus of a communication system, and more particularly, after converting an RF signal received from a base station or a communication system into digital and identifying a pseudo noise code of the RF signal by a digital signal processor. The present invention relates to a method for identifying and removing an unnecessary pseudo noise code capable of transmitting a good signal by improving communication quality by removing unnecessary pseudo noise signals and a signal processing device using the same.

As a signal processing apparatus of a wireless communication system according to the prior art, a repeater which receives an RF signal from a base station and retransmits it to a shadowed area usually has a method of simply amplifying and transmitting a received RF signal, after converting a frequency of the received SF signal. A transmission method and a method of transmitting an RF signal received through a transmission medium such as an optical fiber are used.

FIG. 1 is a schematic diagram illustrating a base station environment in which a general relay is installed, and shows a case where a shadow area is generated in an existing service area (marked with dotted lines) of base station 1 (BTS1) and retransmitted a signal by the relay device R. Referring to FIG. It is shown. In general, a cell-type mobile communication system is operated by a method in which a plurality of base stations covering a predetermined area are installed adjacent to each other to reuse an assigned channel frequency. That is, as shown in FIG. 1, base station 2 (BTS2) and base station 3 (BTS3) having respective service areas are adjacent to each other, and although not shown, a plurality of base stations are arranged to establish a communication network. .

FIG. 2 is a diagram illustrating a signal transmission / reception state of the relay device of FIG. 1. In FIG. 1, when a signal of base station 1 is retransmitted to a shadow area using a relay device, a signal introduced into the receiving antenna 101 of the relay device is shown. Indicates. As shown, the reception antenna 101 basically receives a signal f _B1 of the base station 1 to be retransmitted and _outputs a signal f _B1R retransmitted by the transmission antenna 102. In the reception antenna 101, the signals f _B1R retransmitted to the transmission antenna 102 together with the signals f _B2 , f _B3 ,... Of the other base stations are fed back and received.

Accordingly, as described above, in the relay apparatus according to the related art, in addition to the signal of the base station to be retransmitted through the receiving antenna, a plurality of unintended signals from other base stations or terminals are mixed or signals transmitted to the transmitting antenna are fed back. There is a problem that the communication quality is very poor due to the interference signal. That is, in addition to the signal (represented by a solid line) to be retransmitted as shown in FIG. 2, a number of unnecessary signals (indicated by a dotted line) are mixed.

In order to solve this problem, the interference cancellation system of FIG. 3 is disclosed. In the conventional interference cancellation system according to the related art, the RF signal received by the reception antenna 101 is amplified by the amplifier 103 and sent out through the transmission antenna 102, and the output signal of the amplifier 103 is signaled. After branching by the distribution means 104 to detect the amplitude and phase of the RF signal, a phase amplitude 105, attenuator 106, and delay line 107 generate signals of equal amplitude and antiphase and feed them back. By combining with the signal synthesizing means 108 to remove the interference signal.

However, the above-described method is difficult to obtain accurate dynamic amplitude and anti-phase signal due to the complicated system configuration. As a result, the interference efficiency of the interference signal is not reduced. There is another problem.

In addition, the conventional technology as described above is an analog interference cancellation circuit, which simply detects a signal from its output stage and generates and synthesizes a signal having an amplitude and antiphase with the interference signal included therein, thus increasing the use of a recent CDMA communication system. As a result, there is a disadvantage in that the base station is concentrated in a large number of subscribers, and thus, PN Pollution cannot be coped with.

The present invention is to solve the problems of the prior art as described above, the relay device converts the RF signal received from the base station or the communication system to a digital signal of the base station signal to be retransmitted by the PN detector in the digital signal processor It is an object of the present invention to provide a method for improving communication quality by identifying a noise code and removing other pseudonoise signals by a PN tracker and a signal processing device using the same.

In order to achieve the above object, the present invention provides a device for processing and retransmitting a signal received from a base station or a communication system by a wired or wireless connection, comprising: converting an RF signal received from the base station or the communication system to an intermediate frequency; 1 processing means; Converts the intermediate frequency, which is an analog signal, into a digital signal, down-converts the digital signal into a baseband digital signal, and identifies a pseudo noise code of a base station signal to be retransmitted by a digital signal processor, and removes other pseudo noise signals. Second processing means; Third processing means for up-converting the baseband digital signal from which the unwanted pseudonoise signals have been removed and converting it back into an analog signal; And fourth processing means for converting the intermediate frequency converted into analog into an RF signal.

The first processing means includes: an apparatus for low noise amplifying an RF signal received from a base station or a communication system; and an apparatus for bandpass filtering to remove signals other than required bands; and an intermediate frequency of the filtered RF signal by a mixer. And a device for SAW filtering to remove noise components included in the intermediate frequency; and an apparatus for amplifying or attenuating the intermediate frequency signal to obtain a required gain.

The second processing means includes: an apparatus for converting the intermediate frequency signal into a digital signal by an A / D converter; and an apparatus for downconverting the digital signal into a baseband digital signal; and from the baseband digital signal to a PN detector. And DSP processing by identifying pseudonoise codes of base station signals to be retransmitted and removing unnecessary pseudonoise signals by a PN tracker.

The third processing means includes an apparatus for upconverting the DSP-processed baseband digital signal into a digital signal, and an apparatus for converting the digital signal into an analog intermediate frequency signal by a D / A converter.

The fourth processing means includes: an apparatus for amplifying or attenuating the intermediate frequency signal to obtain a required gain; and an apparatus for low pass filtering to remove unwanted signals included in the intermediate frequency signal; and the intermediate apparatus by a mixer. And an apparatus for upconverting a frequency signal into an RF signal; and an apparatus for amplifying the RF signal to obtain a required gain; and an apparatus for bandpass filtering to remove a signal other than the required band.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of a signal processing method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram illustrating the use of a signal processing device for identifying and eliminating unnecessary pseudonoise codes in accordance with the present invention. As shown, the RF signal input through the reception antenna 401 is filtered by only the reception band filter 402 to be amplified with the noise suppressed as much as possible by the low noise amplifier 403, and the oscillator 408. The local oscillation signal is received from the N-B and down-converted to the intermediate frequency through the first mixer 404. In addition, the intermediate frequency signal is filtered by the SAW filter 405 and unwanted noise and interference signals, and the intensity of the signal is properly adjusted by the first amplifier 406 and the first attenuator 407.

The intermediate frequency signal output from the first attenuator is converted into a digital signal by the A / D converter 301, and the A / D converted digital signal is a pseudo noise code of a base station signal to be retransmitted by the digital processor 302. The bay is identified and other unnecessary pseudonoise signals are removed and converted back into analog signals by the D / A converter 303.

The signal converted to analog by the D / A converter through the digital signal processing is amplified by the second amplifier 409 and passed through the low band filter 410, thereby removing unnecessary signals, especially harmonics. The level is adjusted by the attenuator 411 and then received a local oscillation signal from the oscillator 408 and upconverted to an RF signal via a second mixer 412. The up-converted RF signal is amplified by the power amplifier 413, band-pass filtered by the transmit band filter 414, and then transmitted to the shadow area through the transmit antenna 415.

FIG. 5 is a block diagram illustrating an unnecessary pseudonoise code identification and removal algorithm of FIG. 4, and its operation is as follows. Signals conforming to CDMA (IS-95, CDMA2000, WCDMA, etc.) signals and other standards converted from analog signals to digital signals from the A / D converter 501 are intended to be retransmitted when viewed at the output of the A / D converter 501. Signals from base stations are mixed with signals received from multiple base stations or terminals together with multipath signals received through different paths, respectively.

Here, the output signal of the A / D converter 501 is branched and then applied to the first digital down converter 502 and the second digital down converter 502-1, respectively, so that the first and second digital down converters are used. By frequency conversion to baseband digital I and Q signals. The digital I and Q signals basebanded by the first digital downconverter 502 are outputted with only carrier frequency or bandwidth that conforms to a predetermined communication standard, and is output by the second digital downconverter 502-1. Baseband digital I and Q signals are passed only through signals of individual channels (individual FA in the case of CDMA), and the individual FA signals are first PN detector 504 and first to fifth PN trackers. ) 507, 507-1, 507-2, 507-3, 507-4.

), 진폭 정보(A)를 추출한다. 상기 시간지연, 위상 및 진폭 정보는 제 1 내지 제 5 PN 추적기(507, 507-1, 507-2, 507-3, 507-4)로 순차적으로 전달되어 시간에 따라 변화하는 각 파일럿의 t_d,

, A를 추적하도록 한다. 상기 제 1 내지 제 5 PN 추적기(507, 507-1, 507-2, 507-3, 507-4)가 추적한 결과들은 각각 그에 접속된 제 1 내지 제 5 PN 정보 제어기(506, 506-1, 506-2, 506-3, 506-4)로 전달되며, 이와함께 별도로 구비된 PN 생성기(Generator)(505)에 의해 제거하고자 하는 의사잡음 신호를 생성시키고 상기 생성된 신호는 각각 제 1 내지 제 5 PN 정보 제어기(506, 506-1, 506-2, 506-3, 506-4)로 전달된다.The first PN detector 504 detects a pilot or preamble signal of each signal from a multipath signal of multiple base stations or base stations to be retransmitted, and thus time delay information t _d of each pilot signal. , Phase information (

), Amplitude information A is extracted. The time delay, phase, and amplitude information is sequentially transmitted to the first to fifth PN trackers 507, 507-1, 507-2, 507-3, and 507-4, where t _d of each pilot changes over time. ,

, Track A. The results tracked by the first to fifth PN trackers 507, 507-1, 507-2, 507-3, and 507-4 are respectively connected to the first to fifth PN information controllers 506 and 506-1 connected thereto. , 506-2, 506-3, and 506-4, together with the PN generator 505, which generates a pseudo-noise signal to be removed, and the generated signals are first to first, respectively. And are passed to the fifth PN information controllers 506, 506-1, 506-2, 506-3, and 506-4.

, A)을 지속적으로 추적하고, 그 결과들을 각각 제 1 내지 제 5 PN 정보 제어기(506, 506-1, 506-2, 506-3, 506-4)로 전달하며, 상기 PN 생성기(505)는 제거하고자 하는 의사잡음 신호를 생성시켜 제 1 내지 제 5 PN 정보 제어기로 전달하고 상기 제 1 내지 제 5 PN 정보 제어기로부터 출력되는 신호들을 제 1 내지 제 4 합/감산기(508, 508-1, 508-2, 508-3)를 통과시킴으로써 불요 의사잡음 신호들이 제거되고 의도하는 기지국의 신호만이 중계되도록 하는 것이다.That is, when time delay, phase, and amplitude information of a multipath signal of a base station to be retransmitted by the first PN detector 504 and signals received from a plurality of base stations or terminals is detected, the first to fifth PNs are detected. The trackers 507, 507-1, 507-2, 507-3, and 507-4 provide the same kind of information t _d , from a pilot of the signals that change over time based on the information.

, A) is continuously tracked, and the results are passed to the first to fifth PN information controllers 506, 506-1, 506-2, 506-3, and 506-4, respectively, and the PN generator 505 Generates a pseudo-noise signal to be removed and transmits it to the first to fifth PN information controllers, and the first to fourth sum / subtracters 508, 508-1, By passing through 508-2 and 508-3, the unwanted pseudonoise signals are eliminated and only the signal of the intended base station is relayed.

Subsequently, the signal passing through the first to fourth sum / subtracters 508, 508-1, 508-2, and 508-3 is up-converted into a digital signal by the second digital up-converter 509-1 to generate a first signal. By passing through the 5 sum / subtracter 508-4, the sum / subtracts with the up-converted digital signal by the first digital up-converter 509. This action is performed by the sixth to eighth sum / subtracters 508-5, 508-6, and 508-7, respectively, in the second to fourth PN removal circuit units 520-1, 520-2, and 520-3. And the digital signals passed through the fifth to eighth sum / subtracters 508-4, 508-5, 508-6, and 508-7 are converted into analog signals by the D / A converter 503.

At the same time, a third digital download is performed by branching the digital signal input to the D / A converter 503 through the fifth to eighth sum / subtracters 508-4, 508-5, 508-6, and 508-7. The operation of the signal processing apparatus according to the present invention is monitored by re-identifying the pseudo noise code of the signal to be retransmitted by the second PN detector 504-1 after converting it into a digital I, Q signal by the converter 502-2. Done.

5, the second digital downconverter 502-1, the first PN detector 504, and the first to fifth PN trackers 507, 507-1, 507-2, and 507-. 3, 507-4, first through fifth PN information controllers 506, 506-1, 506-2, 506-3, 506-4, first through fourth sum / subtracters 508, 508-1, 508-2 and 508-3 and the second digital up-converter 509-1 constitute the first PN removal circuit unit 520 as one aggregate, and the PN removal circuit unit is provided for each FA, namely, FIG. 5. In the first to fourth PN removal circuit unit (520, 520-1, 520-2, 520-3) is provided to remove the unnecessary signal for each FA, the relay device according to the present invention is to retransmit only a single FA It is not limited.

FIG. 6 is a block diagram illustrating a state in which the signal processing apparatuses of FIGS. 4 and 5 are configured in plural, and the signal processing apparatus according to the present invention is further connected in a cascade manner. First, FIG. 6 (a) shows the elimination of eight unnecessary pseudo noise signals for each FA for four FAs, for example, FAs 1, 3, 5, and 7, and FIG. 6 (b) shows seven FAs. For example, for FA 1, 2, 3, 4, 5, 6, 7, it is shown that four unnecessary pseudo noise signals are removed for each FA.

That is, the FA to the FA 1, 3, 5, and 7 by the first to fourth PN removal circuits 520, 520-1, 520-2, and 520-3 provided at the front end in FIG. Four unnecessary pseudo noise signals are removed, and the first to fourth PN removal circuit units 520, 520-1, 520-2, and 520-3 are provided to the FAs 1, 3, 5, and 7. Since four unnecessary pseudo noise signals are removed for each FA, eight unnecessary pseudo noise signals are removed for each FA.

In addition, in FIG. 6 (b), the FAs 1, 3, 5, and 7 are FAs by the first to fourth PN removal circuit parts 520, 520-1, 520-2, and 520-3 provided at the front end. Four unnecessary pseudo-noise signals are removed for each time, and four unnecessary for each FA for FA 2, 4, and 6 by the first to third PN elimination circuit parts 520, 520-1, and 520-2 provided at the rear end. Since the pseudo noise signal is removed, four unnecessary pseudo noise signals are removed for each FA.

7 is a view showing the removal of the pseudo noise code of the relay apparatus according to the prior art and the present invention, Figure 7 (a) shows a relay device according to the prior art and Figure 7 (b) is a relay device according to the present invention Indicates. As shown in the related art, in the conventional relay apparatus, not only the pseudonoise codes PN A of the target base station but also the pseudonoise codes PN B and PN C of neighboring base stations are not removed at the output terminal, The relay device can be seen that the pseudo-noise codes (PN B, PN C) of the neighboring base stations are removed or very weak at the output terminal, and only the pseudo-noise code (PN A) of the target base station is normally relayed.

8 and 9 are block diagrams of a relay apparatus using a signal processing apparatus for improving communication quality by identifying and removing pseudo noise codes according to the present invention, and FIG. 8 shows a method of receiving and retransmitting an RF signal from a base station. 9 is a diagram illustrating a method of retransmitting an RF signal by being wired to a base station by a transmission line or the like.

8 and 9, the relay device according to the present invention includes a first duplexer 601 and a first low noise amplifier 602 and a first power amplifier 603 of a forward link, and a second duplexer 604 of a reverse link. Since only the second low noise amplifier 605 and the second power amplifier 606 need to be applied to the digital signal processing apparatus 600, the system configuration becomes very simple.

In addition, when connected to the base station by a transmission line or the like as shown in Figure 9, a variety of lines such as high-frequency coaxial (opaxial) cable, optical line, UTP cable can be used, in particular a large number of remote modules ( In the case of a retransmission relay device using a remote module, a wired telephone line or a CATV public hearing network using VDSL communication may be used.

Therefore, the relay device according to the present invention can be easily operated by the operator considering the radio wave environment of the shadow area, and can be widely applied to various relay systems only by changing the software by digital signal processing, and using digital signal processing technology. By eliminating unnecessary signals at baseband, wideband is possible, which overcomes the limitation of narrowband of conventional analog interference cancellation system. That is, the present invention is a technology that analyzes the signal for each channel by digital signal processing of the entire bandwidth, and is not limited to a specific system, and can be widely applied to various mobile communication methods (IS95, GSM, CDMA2000, WCDMA, etc.) through software upgrade. Can be.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the present invention converts an RF signal received from a base station or a communication system into a digital signal, and then identifies a pseudo noise code of a base station signal to be retransmitted among the RF signals by a digital signal processor, and other pseudo noises. Not only can the signals be improved, the communication quality can be improved, and the network operation of the operators considering the radio wave environment of the shaded area becomes easy, and it can be widely applied to various relay systems only by changing the software by digital signal processing. By using signal processing technology to remove the unnecessary signal from the baseband it is possible to widen the bandwidth.

Claims (13)

A method of processing and retransmitting a signal received from a base station or a communication system by a wired or wireless connection, A first processing means for converting a radio frequency (RF) signal received from the base station or a communication system into an intermediate frequency; and After converting the intermediate frequency, which is an analog signal, into a digital signal, down-converting the digital signal into a baseband digital signal, the pseudo noise code of the base station signal to be retransmitted by the digital signal processor is identified. By second processing means for removing the DSP (Digital Signal Processing) by removing; and By third processing means for upconverting the baseband digital signal from which the unwanted pseudonoise signals have been removed and converting it back into an analog signal; And And a fourth processing means for converting the intermediate frequency converted into analog into an RF signal. The method of claim 1, wherein the step by the second processing means comprises: The intermediate frequency converted into the digital signal is frequency converted into a baseband signal by a first digital mixer, and the converted baseband signal is branched and input to a PN (Pseudo Noise) detector and a PN tracker. After detecting a pilot or a known signal of each signal by the PN detector, the time delay information, phase information, amplitude information is extracted and transferred to the PN tracker, The PN tracker tracks the time delay information, phase information, amplitude information of each pilot or previously known signal that changes over time, and generates pseudo noise signals that the PN generator attempts to remove from the results, which are unnecessary by the sum / subtracter. And a step of removing the pseudo noise signal. An apparatus for processing and retransmitting a signal received from a base station or a communication system by a wired or wireless connection, First processing means for converting an RF signal received from the base station or the communication system into an intermediate frequency; After converting the intermediate frequency, which is an analog signal, into a digital signal, down-converting the digital signal into a baseband digital signal, the pseudo noise code of the base station signal to be retransmitted by the digital signal processor is identified. Second processing means for removing; Third processing means for up-converting the baseband digital signal from which the unwanted pseudonoise signals have been removed and converting it back into an analog signal; And And fourth processing means for converting the intermediate frequency converted into analog into an RF signal. The method of claim 3, wherein the first processing means, An apparatus for low noise amplifying an RF signal received from a base station or a communication system; An apparatus for bandpass filtering to remove signals other than required bands; An apparatus for down-converting the filtered RF signal to an intermediate frequency by a mixer; An apparatus for surface acoustic wave (SAW) filtering to remove noise components included in the intermediate frequency; And And a device for amplifying or attenuating the intermediate frequency signal to obtain a required gain. The method of claim 3, wherein the second processing means, An apparatus for converting the intermediate frequency signal into a digital signal by an analog-to-digital converter; An apparatus for downconverting the digital signal into a baseband digital signal; A device for identifying a pseudo noise code of a base station signal to be retransmitted by a PN detector from the baseband digital signal and removing unnecessary pseudo noise signals by a PN tracker and a PN generator; A signal processing device for identifying and eliminating an unnecessary pseudo noise code. The DSP (Digital Signal Processing) processing apparatus of claim 5, An A / D converter for converting the intermediate frequency signal into a digital signal; A first digital downconverter which receives the output signal of the A / D converter and frequency converts the baseband digital I and Q signals; A first digital up-converter for outputting baseband digital I and Q signals from the first digital down-converter only by outputting a bandwidth corresponding to a carrier-specific frequency or a predetermined communication standard; A second digital down-converter for branching the output signal of the A / D converter to frequency-convert to baseband digital I and Q signals, but passing only signals of individual channels; Receives the output signal of the second digital down-converter, detects a pilot or a pre-known signal included therein, extracts time delay information, phase information, and amplitude information of each pilot signal, and sequentially delivers them to the first to fifth PN trackers. A first PN detector; Receiving the output signal of the second digital down-converter and time delay information, phase information, and amplitude information from the first PN detector, and tracking time delay information, phase information, and amplitude information of each pilot signal that changes with time; 1 to 5 PN trackers; A PN generator generating a pseudo-noise signal to be removed and transmitting it to the first to fifth PN information controllers; First to fourth sum / subtracters connected to the first to fifth PN trackers respectively to receive the results tracked by the first to fifth PN trackers, and receive pseudo noise signals to be removed from the PN generator. Transmitting first to fifth PN information controllers; First to fourth sum / subtracters that take signals output from the first to fifth PN information controllers and sequentially add / subtract them to remove unnecessary pseudo noise signals; A second digital up-converter for up-converting the signal passing through the first to fourth sum / subtracters into a digital signal; A fifth sum / subtractor for adding / subtracting the output of the second digital upconverter with the output of the first digital upconverter; A digital to analog (D / A) converter for converting the digital signal passed through the fifth sum / subtractor into an analog signal; A third digital down converter converting the digital signal input to the D / A converter through the fifth sum / subtractor and converting the digital signal into digital I and Q signals; And And a second PN detector for re-identifying a pseudo noise code of a signal retransmitted from the output of the third digital down converter. The method of claim 6, wherein the DSP processing unit, The second digital downconverter, the first PN detector, the first to fifth PN trackers, the first to fifth PN information controllers, the first to fourth sum / subtracters, and the second digital upconverter as one aggregate; And a PN elimination circuit portion, wherein the PN elimination circuit portion is provided for each channel to remove unnecessary signals for each channel. The DSP processing apparatus of claim 5, wherein At least one unnecessary pseudo noise signal is removed by a signal processing device having PN removal circuit units for each channel with respect to a predetermined channel, and the signal processing device is further connected in a cascade manner to at least one or more unnecessary pseudo signals for the same channel. And a signal processing device for identifying and eliminating unnecessary pseudonoise codes. The DSP processing apparatus of claim 5, wherein At least one unnecessary pseudo noise signal is removed by a signal processing device having PN removal circuit units for each channel with respect to a predetermined channel, and the signal processing device is further connected in a cascade manner to at least one or more unnecessary pseudo signals for the remaining channels. And a signal processing device for identifying and eliminating unnecessary pseudonoise codes. The method of claim 6, wherein the DSP processing unit, The signal processing apparatus by dividing the digital signal input to the D / A converter, converting the digital signal into a digital I and Q signal by a third digital downconverter, and then re-identifying a pseudo noise code of a signal retransmitted by a second PN detector. Signal processing apparatus for identifying and removing the unnecessary pseudo-noise code, characterized in that for monitoring the operation of. The method of claim 3, wherein the third processing means, An apparatus for upconverting the baseband digital signal; and And an apparatus for converting the up-converted digital signal into an analog intermediate frequency signal by a digital-to-analog (D / A) converter. The method of claim 3, wherein the fourth processing means, An apparatus for amplifying or attenuating the intermediate frequency signal to obtain a required gain; A low pass filtering device to remove unwanted signals included in the intermediate frequency signal; An apparatus for up-converting the intermediate frequency signal to an RF signal by a mixer; An apparatus for amplifying the RF signal to obtain a required gain; And And bandpass filtering to remove signals other than the required bands. delete

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