KR100252920B1 - Apparatus for removing noise included in receiving frequency circuit of communication base station - Google Patents

Apparatus for removing noise included in receiving frequency circuit of communication base station Download PDF

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KR100252920B1
KR100252920B1 KR1019970079169A KR19970079169A KR100252920B1 KR 100252920 B1 KR100252920 B1 KR 100252920B1 KR 1019970079169 A KR1019970079169 A KR 1019970079169A KR 19970079169 A KR19970079169 A KR 19970079169A KR 100252920 B1 KR100252920 B1 KR 100252920B1
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signal
noise
antennas
base station
noise signal
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KR19990058976A (en
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김용기
김우식
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서평원
엘지정보통신주식회사
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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
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
    • 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

Abstract

PURPOSE: An apparatus for removing a noise included in a reception frequency circuit of a communication base station is provided to get rid of a strong noise applied via a reception antenna, by using two antennas as units that countervails mutual-interference signal. CONSTITUTION: A reference signal generation part(A) includes two antennas(8,9). A plurality of vector converters(14,15) convert the radio frequency signal, transmitted from the part(A), to a vector signal. A plurality of couplers(10,11,23,24) couple the signals output from the vector converters(14,15). Each of synchronization phase detectors(20,21) detect the noise signal included in the signals output from the couplers(10,11,23,24). A plurality of amplifiers(16-19) amplify the noise signal detected by the detectors(20,21). The antennas(8,9) are used as assistant antennas for each other.

Description

통신 기지국의 수신 주파수 회로에 포함된 잡음 제거 장치Noise Canceling Device Included in Receive Frequency Circuit of Communication Base Station

본 발명은 통신 기지국에서 수신 주파수 회로에 포함된 잡음 제거 장치에 관한 것으로, 특히 수신 안테나를 통해 들어오는 강한 잡음 신호를 제거하기 위해, 두 개의 안테나를 상호 간섭 신호 상쇄기로서 시스템에 적용시켜 잡음 신호를 상쇄시키는 수신 주파수 회로에 관한 것이다.The present invention relates to a noise canceling apparatus included in a reception frequency circuit in a communication base station. In particular, two antennas are applied to a system as a mutual interference canceller to remove a noise signal through a reception antenna. It relates to a receiving frequency circuit to cancel.

종래의 수신 신호 전송과정을 첨부된 도1을 참조하여 설명하면 다음과 같다.A conventional reception signal transmission process will be described with reference to FIG. 1.

일반적으로 통신 기지국의 수신 안테나(7)를 통하여 유입되는, 원하는 신호와 이 신호에 포함된 잡음 신호는, 대역 통과 여파기(1,5)를 각각 경유하여 진폭 변화하고, 상기 진폭 변화된 신호는 저잡음 증폭기(2,6)를 거쳐 수신 가능한 신호로 증폭된 후, 주파수 하향 변환기(3)로 전송된다.In general, a desired signal and a noise signal included in the signal, which are introduced through the receiving antenna 7 of the communication base station, are amplitude-changed via the bandpass filters 1 and 5, respectively, and the amplitude-changed signal is a low noise amplifier. After being amplified into a receivable signal via (2,6), it is transmitted to the frequency down converter (3).

이때 상기 주파수 하향 변환기(3)에서 중간 주파수로 변환된 신호는 대역 변환기(4)에서 베이스 밴드 신호로 변환되어 전송된다.In this case, the signal converted into the intermediate frequency by the frequency down converter 3 is converted into a base band signal by the band converter 4 and transmitted.

그러나 상기와 같은 구성을 갖는 회로에서, 수신 안테나(7)를 통하여 유입되는 신호에는 원하지 않는 강한 연속파(CW)와 같은, 간섭 신호가 포함되는 문제가 발생하며, 상기와 같은 간섭 신호가 코드 분할 다중 접근(CDMA) 대역내로 들어오게 되면 잡음 신호가 되어, 시스템에 상당한 영향을 미치게 되는 문제점이 있다.However, in the circuit having the above configuration, a problem arises in that the signal flowing through the receiving antenna 7 includes an interference signal, such as an unwanted strong continuous wave (CW), and the interference signal as described above is code division multiplexed. Entering into the access (CDMA) band is a noise signal, which has a significant effect on the system.

따라서 상기와 같은 문제점을 해결하기 위하여, 본 발명은 통신 기지국에서 수신 신호에 포함된 잡음 제거 장치에 관한 것으로, 특히 수신 안테나를 통해 들어 오는 강한 잡음 신호를 제거하기 위해, 두 개의 안테나를 이용하여 상호 간섭 신호 상쇄기로서 시스템에 적용시켜 잡음 신호를 상쇄시키는 수신 주파수 회로를 제공하는 것을 그 목적으로 한다.Therefore, in order to solve the above problems, the present invention relates to a noise canceling apparatus included in a received signal in a communication base station, and in particular, to remove a strong noise signal coming through the receiving antenna, mutually using two antennas It is an object of the present invention to provide a reception frequency circuit that is applied to a system as an interference signal canceller to cancel a noise signal.

상기 목적을 달성하기 위하여 본 발명의 형태는 두 개의 수신 안테나로 구성된 기준 신호 발생부와, 상기 기준 신호 발생부로부터 전송된 무선 주파수 신호를 벡터 변조시키는 벡터 변조기, 상기 벡터 변조된 신호를 결합하는 결합기, 상기 결합된 신호에 포함된 잡음 신호를 검출하는 동기 위상 검출기, 상기 검출된 잡음 신호를 증폭시키는 증폭기로 구성되는 잡음 신호 제거 회로부로 구성된다.In order to achieve the above object, an aspect of the present invention provides a reference signal generator comprising two receive antennas, a vector modulator for vector modulating radio frequency signals transmitted from the reference signal generator, and a combiner for combining the vector modulated signals. And a synchronous phase detector configured to detect a noise signal included in the combined signal, and a noise signal cancellation circuit including an amplifier to amplify the detected noise signal.

제1도는 종래의 수신 신호를 전송하는 블록도.1 is a block diagram for transmitting a conventional received signal.

제2도는 본 발명의 수신 신호를 전송하는 블록도.2 is a block diagram for transmitting a received signal of the present invention.

〈도면의 주요부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

1, 5, 25, 29 : 대역통과 여파기 2, 6, 26, 30 : 저잡음 증폭기1, 5, 25, 29: bandpass filter 2, 6, 26, 30: low noise amplifier

3, 27 : 주파수 하향 변환기 7, 8, 9 : 수신 안테나3, 27: frequency down converter 7, 8, 9: receiving antenna

10, 11 : 이중 방향성 결합기 23, 24 : 방향성 결합기10, 11: bidirectional coupler 23, 24: directional coupler

14, 15 : 벡터 변조기 16, 17, 18, 19 : 증폭기14, 15: vector modulator 16, 17, 18, 19: amplifier

20, 21 : 동기 위상 검출기 4, 28 : 대역 변환기20, 21: synchronous phase detector 4, 28: band converter

본 발명의 일실시예를 상세히 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described in detail.

도2에 나타난 수신 주파수 회로에서, 수신 다이버시티(Diversity)를 위한 두개의 수신 안테나(8,9)를 상호 보조 안테나로 이용하여, 상호 간섭 신호를 상쇄시키기 위한 기준 신호 발생부(A)를 구성한다.In the reception frequency circuit shown in Fig. 2, using the two reception antennas 8 and 9 for reception diversity as a mutual auxiliary antenna, a reference signal generator A for canceling the mutual interference signal is configured. do.

상기 기준 신호 발생부(A)의 각 수신 안테나(8,9)측에는 각각의 이중 방향성 결합기(10,11)를 구성하고, 상기 수신 안테나(8,9)를 통하여 유입된 각각의 신호를 간섭 신호 상쇄기(10,11)를 통해 서로 주고 받는다.Each receiving antenna (8, 9) side of the reference signal generator (A) constitutes each of the dual directional coupler (10, 11), each signal introduced through the receiving antenna (8, 9) interference signal Send and receive each other through the canceller (10, 11).

이 경우, 일반적으로 코드 분할 다중 접근 수신 전력은 -100dBm 정도의 레벨로서, AMPS와 같은 강한 잡음 신호는 동기 수신기를 구성하여 잡음 신호를 검출하여, 이 잡음 신호의 위상은 반전시키고, 진폭은 동일하게 하여 잡음 신호를 상쇄하도록 구성한다.In this case, the code division multiple access reception power is generally at a level of about -100 dBm. A strong noise signal such as AMPS forms a synchronous receiver to detect a noise signal, inverts the phase of the noise signal, and has the same amplitude. To cancel the noise signal.

상기와 같은 구성에 따른 동작 원리를 상세히 설명하면 다음과 같다.Referring to the operation principle according to the above configuration in detail as follows.

두 개의 수신 안테나(8,9)중, 수신 안테나(8)를 보조 안테나로 이용하여, 상기 수신 안테나(8)를 통하여 유입된 수신 신호는 벡터 변조기(14)를 거쳐 수신 안테나(9)에 연결된 이중 방향성 결합기(11)와 방향성 결합기(24)를 경유하게 된다.Of the two receiving antennas 8 and 9, using the receiving antenna 8 as an auxiliary antenna, the received signal introduced through the receiving antenna 8 is connected to the receiving antenna 9 via the vector modulator 14. Via the directional coupler 11 and the directional coupler 24.

상기 방향성 결합기(24)로 전송된 수신 신호는 다시 동기 위상 검출기(21)로 전송되는데, 이때 수신 신호에 포함된 강한 잡음 신호를 검출하여 신호의 위상을 180도 반전시키게 된다.The received signal transmitted to the directional coupler 24 is transmitted to the synchronous phase detector 21 again, where the strong noise signal included in the received signal is detected to invert the phase of the signal by 180 degrees.

상기 위상이 180도 반전된 잡음 신호는, 증폭기(18,19)를 통해 검출하기 이전의 잡음 신호와 동일한 진폭을 갖도록 증폭되고, 이 증폭된 신호는 다시 벡터 변조기(14)로 피드 백 되고, 상기 벡터 변조지(14)로 피드 백 된 신호는, 다시 이중 방향성 결합기(11)로 전송되어, 수신 안테나(9)를 통해 유입되는 잡음 신호와 결합됨으로써, 수신 안테나(9)를 통해 유입되는 잡음 신호를 상쇄시키게 된다.The noise signal whose phase is inverted 180 degrees is amplified to have the same amplitude as the noise signal prior to detection via amplifiers 18 and 19, which are then fed back to vector modulator 14, The signal fed back to the vector modulation paper 14 is transmitted back to the dual directional coupler 11 and combined with the noise signal flowing through the receiving antenna 9, thereby introducing a noise signal flowing through the receiving antenna 9. Will be offset.

상기와 동일한 방법으로, 두 개의 수신 안테나(8,9)중, 수신 안테나(9)를 보조 안테나로 이용하여, 상기 수신 안테나(9)를 통하여 유입된 수신 신호는 벡터 변조기(15)를 거쳐 수신 안테나(8)에 연결된 이중 방향성 결합기(10)와 방향성 결합기(23)를 경유하게 된다.In the same manner as described above, of the two receiving antennas 8 and 9, the receiving signal received through the receiving antenna 9 is received via the vector modulator 15 using the receiving antenna 9 as an auxiliary antenna. Via the directional coupler 10 and the directional coupler 10 connected to the antenna (8).

상기 방향성 결합기(23)로 전송된 수신 신호는 다시 동기 위상 검출기(20)로 전송되는데, 이때 수신 신호에 포함된 강한 잡음 신호를 검출하여 신호의 위상을 180도 반전시키게 된다.The received signal transmitted to the directional coupler 23 is transmitted to the synchronous phase detector 20 again, where the strong noise signal included in the received signal is detected to invert the phase of the signal by 180 degrees.

상기 위상이 180도 반전된 잡음 신호는, 증폭기(16,17)를 통해 검출되기 이전의 잡음 신호와 동일한 진폭을 갖도록 증폭되고, 이 증폭된 신호는 다시 벡터 변조기(15)로 피드 백 되고, 상기 벡터 변조기(15)로 피드 백 신호는, 다시 이중 방향성 결합기(10)로 전송되어, 수신 안테나(8)를 통해 유입되는 잡음 신호와 결합됨으로써, 수신 안테나(8)를 통해 유입되는 잡음 신호를 상쇄시키게 된다.The noise signal in which the phase is inverted 180 degrees is amplified to have the same amplitude as the noise signal before being detected through the amplifiers 16 and 17, which are then fed back to the vector modulator 15. The feed back signal to the vector modulator 15 is transmitted back to the bidirectional combiner 10 and combined with the noise signal flowing through the receiving antenna 8 to cancel the noise signal flowing through the receiving antenna 8. Let's go.

상기 과정을 거쳐 잡음 신호가 상쇄된 신호들은, 각각의 여파기(25,29)를 경유하여 수신 가능한 신호로 진폭 변화하고, 상기 진폭 변화된 신호는 다시 각각의 저잡음 증폭기(26,30)를 거쳐 수신 가능한 신호로 증폭된 후, 주파수 하향 변환기(27)로 전송된다.Signals in which the noise signal is canceled through the above process are amplitude-changed into a signal that can be received via the respective filters 25 and 29, and the amplitude-changed signal can be received again through the respective low noise amplifiers 26 and 30. After amplified by the signal, it is transmitted to the frequency down converter 27.

따라서 상기와 같은 형태의 수신 주파수 회로는 양질의 수신 신호를 전송할 수 있게 된다.Therefore, the reception frequency circuit of the above type can transmit a good reception signal.

통신 기지국의 수신 주파수 회로에서, 각각의 수신 안테나를 통해 들어오는 수신 신호에 포함된 강한 잡음 신호를 제거하기 위해, 두 개의 안테나를 상호 보조 안테나로 이용하여, 상호 간섭 신호 상쇄기로서 시스템에 적용시킴으로써, 상호 잡음 신호를 상쇄시켜 코드; 분할 다중 접근 대역내로 유입되는 강한 잡음 신호를 제거하는 효과를 얻는다.In a receive frequency circuit of a communication base station, by applying two antennas as mutual aid antennas to a system as a mutual interference signal canceller, in order to remove the strong noise signal contained in the received signal received through each receive antenna, Code by canceling the mutual noise signal; The effect of removing the strong noise signal introduced into the divided multiple access bands is obtained.

Claims (4)

두 개의 안테나(8,9)로 구성된 기준 신호 발생부(A)와; 상기 기준 신호 발생부(A)로부터 전송된 무선 주파수 신호를 벡터 변조시키는 벡터 변조기(14,15)와, 상기 벡터 변조된 신호를 결합하는 결합기(10,11,23,24)와, 상기 결합된 신호에 포함된 잡음 신호를 검출하는 동기 위상 검출기(20,21)와, 상기 검출된 잡음 신호를 증폭시키는 증폭기(16,17,18,19)로 구성되는 잡음 신호 제거 회로부(B)로 이루어지는 것을 특징으로 하는, 통신 기지국의 수신 주파수 회로에 포함된 잡음 제거 장치.A reference signal generator A comprising two antennas 8, 9; A vector modulator (14, 15) for vector modulating the radio frequency signal transmitted from the reference signal generator (A), a combiner (10, 11, 23, 24) for combining the vector modulated signal, and the combined And a noise signal cancellation circuit section (B) consisting of a synchronous phase detector (20, 21) for detecting a noise signal included in the signal and an amplifier (16, 17, 18, 19) for amplifying the detected noise signal. A noise canceling device included in a reception frequency circuit of a communication base station. 제1항에 있어서, 상기 기준 신호 발생부(A)의 상기 수신 안테나(8,9)는 상호 보조 안테나로 이용되는 것을 특징으로 하는, 통신 기지국의 수신 주파수 회로에 포함된 잡음 제거 장치.The apparatus of claim 1, wherein the reception antennas (8, 9) of the reference signal generator (A) are used as mutual aid antennas. 제1항에 있어서, 상기 잡음 신호 제거 회로부(B)에 포함된, 상기 결합기(10,11,23,24) 중, 결합기(10,11)는 이중 방향성 결합기로 구성되는 것을 특징으로 하는, 통신 기지국의 수신 주파수 회로에 포함된 잡음 제거 장치.The communication device according to claim 1, characterized in that, among the couplers (10, 11, 23, 24) included in the noise signal cancellation circuit section (B), the combiners (10, 11) are constituted by dual directional couplers. Noise reduction device included in the reception frequency circuit of the base station. 제1항에 있어서, 상기 잡음 신호 제거 회로부(B)는 귀환 회로로 구성되는 것을 특징으로 하는, 통신 기지국의 수신 주파수 회로에 포함된 잡음 제거 장치.2. The noise canceling device included in the reception frequency circuit of a communication base station according to claim 1, wherein the noise signal canceling circuit section (B) is composed of a feedback circuit.
KR1019970079169A 1997-12-30 1997-12-30 Apparatus for removing noise included in receiving frequency circuit of communication base station KR100252920B1 (en)

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