KR0150280B1 - Receiver for cancelling interference signal - Google Patents
Receiver for cancelling interference signalInfo
- Publication number
- KR0150280B1 KR0150280B1 KR1019950050104A KR19950050104A KR0150280B1 KR 0150280 B1 KR0150280 B1 KR 0150280B1 KR 1019950050104 A KR1019950050104 A KR 1019950050104A KR 19950050104 A KR19950050104 A KR 19950050104A KR 0150280 B1 KR0150280 B1 KR 0150280B1
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- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000007704 transition Effects 0.000 abstract description 2
- 230000006866 deterioration Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000001228 spectrum Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 230000002452 interceptive effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000000586 desensitisation Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
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- Signal Processing (AREA)
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Abstract
본 발명은 대역저지필터를 포함하는 궤환 루프와 빼기회로를 이용하여 안테나로 수신되는 간섭신호를 제거하는 수신기에 관한 것으로, 종래 수신기에 제1차 믹서의 출력에서 원하는 신호를 저지하고 간섭 신호만을 통과시키는 대역저지필터, 상기 대역저지필터의 출력을 입력받아 국부발진기의 중간주파수를 이용하여 하향으로 주파수 변환시키는 제2차 믹서, 송수신 절환기를 통해 입력되는 간섭신호와의 적절한 레벨을 맞추기 위하여 상기 제2차 믹서에서 출력되는 신호의 크기를 적절하게 조정하는 가변이득증폭기, 상기 가변이득증폭기의 출력을 입력받아 역상으로(180°천이) 바꾸는 위상천이기, 및 상기 위상천이기의 출력을 입력받아 시간 지연을 시키는 시간지연기를 포함하는 궤환루프가 연결되는 것을 특징으로 하여, 수신기의 성능을 저하시키지 않고 간섭신호를 제거할 수 있는 효과가 있다.The present invention relates to a receiver for removing an interference signal received by an antenna using a feedback loop and a subtraction circuit including a band blocking filter. The present invention blocks a desired signal at the output of a first mixer and passes only an interference signal to a conventional receiver. A second band mixer to receive an output of the band stop filter, and a frequency converter to convert a frequency downward by using an intermediate frequency of a local oscillator; and to adjust an appropriate level with an interference signal inputted through a transceiver. A variable gain amplifier for appropriately adjusting the magnitude of the signal output from the difference mixer, a phase shifter that receives the output of the variable gain amplifier and reverses it (180 ° transition), and receives a time delay from the output of the phase shifter. It is characterized in that the feedback loop including a time delay to make a deterioration of the performance of the receiver The interference signal can be removed without height.
Description
제1도는 수신기의 블록도.1 is a block diagram of a receiver.
제2도는 간섭신호의 영향을 해결하기 위해 종래에 제한된 수신기의 블록도.2 is a block diagram of a conventionally limited receiver to address the effects of interfering signals.
제3도는 본 발명에 의한 간섭신호 제거용 수신기의 블록도.3 is a block diagram of a receiver for canceling an interference signal according to the present invention.
제4도는 본 발명에 의한 간섭신호 제거용 수신기의 각 점의 신호의 주파수 스펙트럼을 도시한 도면.4 is a diagram showing the frequency spectrum of the signal of each point of the interference signal cancellation receiver according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
LNA : 저잡음 증폭기 BPF : 대역통과필터LNA: Low Noise Amplifier BPF: Bandpass Filter
BRF : 대역저지필터 VGA : 가변 이득 증폭기BRF: Bandstop Filter VGA: Variable Gain Amplifier
LO : 국부 발진기LO: local oscillator
본 발명은 간섭신호 제거용 수신기에 관한 것으로 특히, 대역저지필터를 포함하는 궤환 루프와 빼기회로를 이용하여 안테나로 수신되는 간섭신호를 제거하는 수신기에 관한 것이다. 보통 국내외적으로 사용중인 아날로그 이동통신 시스템은 복수의 사업자를 위하여 A대역과 B대역 둘로 나누어져 있는데, 두 서비스 시스템간의 간섭 신호 레벨을 표준 규격에 의하여 정의함으로써 서로 다른 상호 두 시스템간의 영향이 없도록 하고 있다. 제1도는 종래 수신기의 구조를 도시하는 블록도이다. 현재 상용 시스템 준비중에 있는 코드분할 다중접속 방식(이하 CDMA로 표기함) 시스템의 경우, CDMA 기지국의 셀 가장자리 위치에서 통화중인 CDMA 이동국인 경우, 즉 이 경우는 CDMA 이동국의 수신레벨은 최저인 상태인데 이런 위치에 A대역의 아날로그 시스템이 운용중인 기지국이 있는 경우 상당히 큰 레벨의 신호가 CDMA 이동국 RF(Radio Frequency) 초단의 저잡음 증폭기(LNA)를 포화시켜 CDMA 이동국이 이 간섭 신호의 영향으로 호가 절단되는 현상이 발생하는 문제점이 발생하고 있다. 이러한 문제점을 해결하고자 현재 몇가지 방법이 제안되고 있다. 제2도는 간섭신호의 영향을 해결하기 위해 종래에 제안된 수신기의 블록도이다. 제2도에 도시된 바와 같이, 안테나로 수신되는 신호 레벨이 규정된 이상의 레벨일 경우 저잡음 증폭기를 통하지 않고 이를 바이패스(bypass) 시킴으로서 저잡음 증폭기의 이득에 해당하는 만큼의 신호 레벨의 감쇠 효과를 얻음으로써 해결하는 방법이 제안되고 있다. 그러나 이 경우 가장 근본적인 단점은 CDMA 이동국 수신기의 RF 신호 감도(RF Sensitivity)의 성능 저하를 가져옴은 물론 이로 인하여 단일톤 둔감도(Single Tone Desensitization)의 성능 저하도 가져와 CDMA 이동국의 성능 저하를 초래하고 결국 CDMA 시스템의 용량에도 영향을 끼치는 등 문제 해결을 위하여 필요 이상의 단점을 유발하였다. 따라서, 본 발명은 CDMA 이동국의 성능을 저하시키지 않으면서 안테나를 통해서 수신되는 간섭신호를 제거할 수 있는 수신기를 제공하는데 그 목적이 있다. 상기한 바와 같은 목적을 달성하기 위하여 본 발명은, 안테나를 통해 수신된 신호가 송수신 절환기를 거쳐 입력될 때 저잡음 증폭을 하는 저잡음 증폭기, 상기 저잡음 증폭기에서 출력된 신호를 입력받아 스퓨리어스 신호를 제거하는 대역통과필터, 중간주파수를 발진하는 국부발진기, 및 상기 국부발진기의 중간주파수를 이용하여 상기 대역통과필터의 출력을 상향으로 주파수 변환하는 제1차 믹서를 포함하는 수신기에: 상기 제1차 믹서의 출력에서 원하는 신호를 저지하고 간섭신호만을 통과시키는 대역저지필터, 상기 대역저지필터의 출력을 입력받아 상기 국부발진기의 중간주파수를 이용하여 하향으로 주파수 변환시키는 제2차 믹서, 상기 송수신 절환기를 통해 입력되는 간섭신호와의 적절한 레벨을 맞추기 위하여 상기 제2차 믹서에서 출력되는 신호의 크기를 적절하게 조정하는 가변이득증폭기, 상기 가변이득증폭기의 출력을 입력받아 역상으로(180°천이) 바꾸는 위상천이기, 및 상기 위상천이기의 출력을 입력받아 시간 지연을 시키는 시간지연기를 포함하는 궤환루프가 상기 제1차 믹서와 상기 저잡음 증폭기 사이에 연결된 것을 특징으로 한다. 이하, 첨부된 도면을 참조하여 본 발명을 상세히 설명한다. 제3도는 본 발명에 의한 간섭신호 제어용 수신기의 구조를 도시하는 블록도이다. 제3도에서, 301은 송수절환기, 302는 수신부, 303은 저잡음 증폭기, 304는 대역통과필터, 305는 국부 발진기, 306은 믹서, 307은 대역통과필터, 308은 증폭기, 309는 대역저지필터, 310은 믹서, 311은 가변이득증폭기, 312는 위상천이기, 313는 지연기를 각각 나타낸다. 제4도는 제3도에 도시된 회로의 각 점에서의 신호 주파수 스펙트럼을 도시한 도면이다. CDMA 이동국이 정상적인 호를 이루고 있는 상태에서 만약 아날로그 기지국으로 부터 오는 큰 레벨의 RF 신호가 CDMA 이동국의 안테나를 통하여 송수신 절환기(Duplexer, 301)를 거친 후 저잡음증폭기(LNA, 303)에서 저잡음 증폭을 하게 된다. 여기서 안테나를 통해 들어온 신호는 제4도의 A와 같은 스펙트럼을 갖게 될 것이다. 이후 대역통과여파기(BPF, 304)에서 대역 외의 스퓨리어스 신호(spurious signal)가 제거된 후 1차 믹서(306)에서 국부발진신호(LO, 305)와 함께 중간주파수로 주파수 변환된다. 여기서의 신호는 제4도의 B처럼 희망 신호에 대한 중간 주파수 뿐만 아니라 간섭 신호에 대해 주파수 변환된 신호도 함께 나타나게 될 것이다. 이 신호를 원하는 중간주파수만을 저지시키는 대역저지필터(Band Rejection Filter, 309)를 거치게 되면 제4도의 C처럼 간섭 신호의 주파수 변환된 신호로 나타나게 된다. 이 신호를 국부발진신호(LO, 305)와 믹서(Mixer, 310)에서 주파수 변환하게 되면 제4도의 D처럼 나오게 된다. 이후 나중에 궤환루프에서 이 신호와 입력되는 간섭 신호와의 적절한 레벨을 맞추기 위하여 가변이득증폭기(311)를 거친 후, 위상천이기(Phase Shifter, 312)에서 위상을 역상으로 바꾸어 주게 되면, 제4도의 E와 같은 스펙트럼을 갖게 된다. 이후 지연기(Delay line, 313)을 거치게 된다. 이렇게 궤환되어 나온 신호(제4도의 E)는 원래 안테나로 입력된 신호와 빼기회로(314)를 거치게 되면 (즉, 제4도의 E와 A신호) 제4도의 F와 같이 희망 신호인 RF 신호만 남게 된다. 이렇게 되면 1차 믹서(306)를 거친 후의 신호는 제4도의 G처럼 원하는 중간 주파수만 남게 되어 간섭 신호로 부터의 영향으로 부터 벗어날 수 있게 된다. 상기한 본 발명에 의하여 수신기의 성능을 저하시키지 않고 간섭신호를 제거할 수 있는 효과가 있다. 또한, 본 발명을 이용함으로써 서로 다른 시스템의 간섭 신호뿐만 아니라 동일 시스템에 대한 간섭 신호도 제거할 수 있어 안테나로 들어 오는 어떠한 형태의 모든 간섭 신호도 제거할 수 있는 효과가 있다.The present invention relates to a receiver for removing interference signals, and more particularly, to a receiver for removing interference signals received by an antenna using a feedback loop and a subtraction circuit including a band blocking filter. Usually, analog mobile communication system used at home and abroad is divided into two bands A and B for a plurality of service providers. By defining the interference signal level between two service systems according to the standard, there is no influence between two different systems. have. 1 is a block diagram showing the structure of a conventional receiver. In the code division multiple access method (hereinafter referred to as CDMA) system, which is currently being prepared for commercial systems, the CDMA mobile station is busy at the cell edge of the CDMA base station, that is, in this case, the reception level of the CDMA mobile station is lowest. If there is a base station with an A-band analog system at this location, a fairly large level of signal saturates the low-noise amplifier (LNA) at the CDMA radio frequency (RF) stage, causing the CDMA mobile station to be dropped by the influence of this interfering signal. There is a problem that a phenomenon occurs. Several methods are currently proposed to solve this problem. 2 is a block diagram of a conventionally proposed receiver to solve the influence of an interference signal. As shown in FIG. 2, when the signal level received by the antenna is above a prescribed level, the signal level is attenuated as much as the gain of the low noise amplifier by bypassing the low noise amplifier without passing through it. In order to solve this problem, a solution has been proposed. However, the most fundamental disadvantage in this case is not only the performance degradation of the RF signal sensitivity of the CDMA mobile station receiver, but also the performance degradation of the single tone desensitization, which leads to the performance degradation of the CDMA mobile station. It also caused more disadvantages than necessary to solve the problem, such as affecting capacity of CDMA system. Accordingly, an object of the present invention is to provide a receiver capable of canceling an interference signal received through an antenna without degrading the performance of a CDMA mobile station. In order to achieve the above object, the present invention provides a low noise amplifier for low noise amplification when a signal received through an antenna is inputted through a transceiver, and a band for receiving a signal output from the low noise amplifier to remove a spurious signal. A receiver comprising a pass filter, a local oscillator for oscillating an intermediate frequency, and a primary mixer for up-converting the output of the bandpass filter using an intermediate frequency of the local oscillator: an output of the primary mixer A band stop filter for blocking a desired signal and passing only an interference signal, a second mixer for receiving the output of the band stop filter and converting the frequency downward by using an intermediate frequency of the local oscillator, Output from the secondary mixer in order to match an appropriate level with the interference signal. A variable gain amplifier for appropriately adjusting the magnitude of the signal, a phase shifter that receives the output of the variable gain amplifier and reverses it (180 ° transition), and a time delay for delaying the output of the phase shifter. A feedback loop comprising: is connected between the primary mixer and the low noise amplifier. Hereinafter, with reference to the accompanying drawings will be described in detail the present invention. 3 is a block diagram showing the structure of an interference signal control receiver according to the present invention. In FIG. 3, 301 is a handset converter, 302 is a receiver, 303 is a low noise amplifier, 304 is a bandpass filter, 305 is a local oscillator, 306 is a mixer, 307 is a bandpass filter, 308 is an amplifier, 309 is a bandstop filter Denotes a mixer, 311 denotes a variable gain amplifier, 312 a phase shifter, and 313 a retarder. 4 is a diagram showing the signal frequency spectrum at each point of the circuit shown in FIG. If the CDMA mobile station is in a normal call, if a large level RF signal from the analog base station passes through the transceiver of the CDMA mobile station (Duplexer, 301), the low noise amplifier (LNA, 303) performs low noise amplification. Done. Here the signal coming through the antenna will have a spectrum like A in FIG. After the out-of-band spurious signal is removed from the band pass filter BPF 304, the first mixer 306 is frequency-converted to the intermediate frequency together with the local oscillation signal LO 305. The signal here will appear with the frequency converted signal for the interfering signal as well as the intermediate frequency for the desired signal as shown in FIG. This signal is passed through a band rejection filter (Band Rejection Filter, 309) that blocks only the desired intermediate frequency, as shown in Figure 4, the frequency-converted signal of the interference signal. When this signal is frequency-converted by the local oscillation signals LO and 305 and the mixer 310 and the signal comes out as D in FIG. Later, the feedback loop passes through the variable gain amplifier 311 to adjust the level of the input signal and the interference signal, and then the phase shifter 312 changes the phase to reverse phase. It has the same spectrum as E. After that, it goes through a delay line (313). The feedback signal (E of FIG. 4) passes through the signal originally inputted to the antenna and the subtraction circuit 314 (that is, the E and A signals of FIG. 4). Will remain. In this case, the signal after passing through the first mixer 306 remains only the desired intermediate frequency as shown in G of FIG. 4, thereby deviating from the influence from the interference signal. According to the present invention described above there is an effect that can remove the interference signal without reducing the performance of the receiver. In addition, by using the present invention, it is possible to remove not only interference signals of different systems but also interference signals for the same system, thereby removing all interference signals of any type coming into the antenna.
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| KR1019950050104A KR0150280B1 (en) | 1995-12-14 | 1995-12-14 | Receiver for cancelling interference signal |
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| KR1019950050104A KR0150280B1 (en) | 1995-12-14 | 1995-12-14 | Receiver for cancelling interference signal |
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| KR970055648A KR970055648A (en) | 1997-07-31 |
| KR0150280B1 true KR0150280B1 (en) | 1998-11-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020078901A (en) * | 2001-04-11 | 2002-10-19 | 주식회사 팬택앤큐리텔 | Low noise amplifier in mobile communication phone |
| KR100511296B1 (en) * | 2002-11-08 | 2005-08-31 | 엘지전자 주식회사 | A low noise amplifier with exclude harmonics for linearity |
| KR100703366B1 (en) * | 2004-12-21 | 2007-04-03 | 삼성전자주식회사 | Noise Canceling Device for Wireless Transceiver |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100258211B1 (en) * | 1997-08-30 | 2000-06-01 | 윤종용 | Apparatus and method for reiecting spurious signal of transmitter in wireless communication system |
| KR100692625B1 (en) * | 2006-04-11 | 2007-03-14 | 넥스원퓨처 주식회사 | RF module |
| CN106849877A (en) * | 2016-12-20 | 2017-06-13 | 中国电子科技集团公司第四十三研究所 | One kind miniaturization low-noise amplifier |
| CN113676205A (en) * | 2021-08-17 | 2021-11-19 | 天津七六四通信导航技术有限公司 | A full-duplex data communication device |
-
1995
- 1995-12-14 KR KR1019950050104A patent/KR0150280B1/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020078901A (en) * | 2001-04-11 | 2002-10-19 | 주식회사 팬택앤큐리텔 | Low noise amplifier in mobile communication phone |
| KR100511296B1 (en) * | 2002-11-08 | 2005-08-31 | 엘지전자 주식회사 | A low noise amplifier with exclude harmonics for linearity |
| KR100703366B1 (en) * | 2004-12-21 | 2007-04-03 | 삼성전자주식회사 | Noise Canceling Device for Wireless Transceiver |
Also Published As
| Publication number | Publication date |
|---|---|
| KR970055648A (en) | 1997-07-31 |
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