KR20000050441A - Transmisson power controller wireless mechanism and method - Google Patents
Transmisson power controller wireless mechanism and method Download PDFInfo
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- KR20000050441A KR20000050441A KR1019990000323A KR19990000323A KR20000050441A KR 20000050441 A KR20000050441 A KR 20000050441A KR 1019990000323 A KR1019990000323 A KR 1019990000323A KR 19990000323 A KR19990000323 A KR 19990000323A KR 20000050441 A KR20000050441 A KR 20000050441A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength
-
- 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
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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Abstract
Description
본 발명은 배터리를 사용하는 FRS 및 기타 무선통신기기에 관한 것으로, 특히 무선 송수신기의 수신 전파의 세기에 따라 송신때 이에 대응하는 전파의 세기만큼만 송신 RF 파우어를 송출하도록 함으로써 필요이상의 최대전력으로 송신하는 것을 방지하여 배터리를 더욱 장시간 사용할 수 있도록 하는 무선기기의 송신파우어제어장치 및 방법에 관한 것이다.The present invention relates to a FRS and other wireless communication devices using a battery, and in particular, according to the strength of the received radio wave of the radio transceiver to transmit the transmission RF power only by the intensity of the corresponding radio wave to transmit at a maximum power more than necessary The present invention relates to a transmission power control apparatus and method for a wireless device, which prevents the battery from being used for a longer time.
일반적으로 무선기는 송수신 상태가 양호한 조건에서 주로 교신이 이루어진다.In general, radios communicate mainly under conditions of good transmission and reception.
수신이 양호한 상태 즉 가까운 거리에서 수신을 한 후에도 송신을 하게 되면 무조건 최대의 RF 파우어로 송신하게 된다.If the transmission is performed even after reception is in good condition, i.e., close range, it is transmitted with the maximum RF power.
따라서 종래 무선기기에 있어서는 어떤 조건에 관계없이 최대의 출력을 방출하므로 전력소모가 많아 배터리의 사용시간이 줄어드는 문제가 있었다.Therefore, the conventional wireless device emits the maximum power regardless of any condition, so there is a problem in that the power consumption is large and the use time of the battery is reduced.
본 발명은 이와같은 종래의 문제점을 해결하기 위하여 안출한 것으로, 본 발명의 목적은, 무선 송수신기의 수신되는 전파의 세기에 따라 송신때에는 이에 대응하는 전파의 세기만큼만 송신 RF 파우어를 송출하도록 하는 무선기기의 송신파우어제어장치 및 방법을 제공하는데 있다.SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and an object of the present invention is to transmit a transmit RF power only as much as the strength of the corresponding radio wave when transmitting according to the strength of the received radio wave of the radio transceiver. To provide a transmission power control apparatus and method of the present invention.
도 1은 본 발명의 블럭도1 is a block diagram of the present invention
도 2는 본 발명에 따른 동작 흐름도이다2 is an operational flowchart according to the present invention.
<도면의 주요 부분에 대한 부호의 설명><Description of the code | symbol about the principal part of drawing>
1:밴드패스필터2:RF증폭부1: Band pass filter 2: RF amplifier
3:믹서4:IF부3: Mixer 4: IF section
5:IF증폭부9:파우어 앰프5: IF amplifier 9: power amplifier
13:VCO15:RSSI검출 및 RF파우어 제어부13: VCO15: RSSI detection and RF power control
100:수신부200:송신부100: receiver 200: transmitter
300:제어부300: control unit
이와같은 목적을 달성하기 위한 본 발명은 수신신호에서 RSSI(Received Siginal Strength Indicator:기지국의 수신전력을 측정하는데 사용하는 변수)값을 검출하여 송신 파우어 앰프를 제어함으로써 송신시 적절한 파우어가 제공될 수 있도록 구성함을 특징으로 한다.In order to achieve the above object, the present invention detects a RSSI (Received Siginal Strength Indicator) value in a received signal and controls a transmission power amplifier so that an appropriate power may be provided during transmission. It is characterized by the configuration.
이하, 본 발명의 실시예를 첨부된 도면을 참고로 하여 상세히 설명하면 다음과 같다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1은 본 발명의 블록도, 크게 수신부(100), 송신부(200), 제어부(300)로 구성된다.1 is a block diagram of the present invention, which is largely comprised of a receiver 100, a transmitter 200, and a controller 300. As shown in FIG.
먼저, 수신부(100)는, 수신되는 신호를 필터링하기 위한 밴드패스필터(1)와, 상기 밴드패스필터(1)의 출력신호에서 RF 신호를 소정레벨로 증폭하기 위한 RF증폭부(2)와, 입력되는 신호들을 혼합하는 믹서(3)와, 상기 믹서(3)를 통한 신호에서 중간주파수인 IF를 추출하여 출력하는 IF부(4)와, 상기IF부(4)의 출력신호를 소정 레벨로 증폭하여 스피커를 통하여 출력시키는 IF증폭부(5)로 구성된다.First, the receiver 100 includes a band pass filter 1 for filtering a received signal, an RF amplifier 2 for amplifying an RF signal to a predetermined level from an output signal of the band pass filter 1, and And a mixer 3 for mixing the input signals, an IF unit 4 for extracting and outputting an IF having an intermediate frequency from the signal through the mixer 3, and an output signal of the IF unit 4 at a predetermined level. It consists of an IF amplifier (5) for amplifying and outputting through a speaker.
그리고 송신부(200)는, 입력되는 신호를 버퍼링하는 송신버퍼(6)와, 상기 송신버퍼(6)의 출력을 소정레벨로 증폭시키는 프리앰프(7)와, 상기 프리앰프(7)를 통한 출력신호를 다시 소정레벨로 증폭시키는 구동앰프(8)와, 상기 구동앰프(8)의 출력단에 접속되어 송신시 전력을 공급하는 파우어 앰프(9)와, 상기 파우어 앰프(9)의 출력신호에서 일정대역의 신호만 통과시켜 안테나로 출력하는 로우패스필터(10)로 구성된다.The transmitting unit 200 includes a transmission buffer 6 for buffering an input signal, a preamplifier 7 for amplifying the output of the transmission buffer 6 to a predetermined level, and an output through the preamplifier 7. A driving amplifier 8 for amplifying the signal back to a predetermined level, a power amplifier 9 connected to an output terminal of the driving amplifier 8 for supplying power during transmission, and a constant output signal from the power amplifier 9; It consists of a low pass filter 10 for passing only the signal of the band and output to the antenna.
또한, 제어부(300)는 마이크(11)를 통한 입력신호를 소정레벨로 증폭시키는 증폭부(12)와, 상기 증폭부(12)의 출력단에 접속되어 인가전압의 전입과 같이 변화하여 상기 믹서(3)와 송신버퍼(6)에 발진주파수를 인가하는 전압 제어 발진기인VCO(13)와, 상기 VC0(13)와 신호를 주고 받으며 제어를 수행하는 CPU(14)와, 상기CPU(14)의 제어에 따라 상기 IF부(4)로부터 RSSI를 검출하여 상기 파우어 앰프(9)를 제어하는 RSSl검출 및 RF파우어 제어부(15)로 구성된다.In addition, the control unit 300 is connected to the amplifier 12 for amplifying the input signal through the microphone 11 to a predetermined level, and is connected to the output terminal of the amplification unit 12 is changed as the transfer of the applied voltage to the mixer ( 3) and the VCO 13, which is a voltage controlled oscillator for applying an oscillation frequency to the transmission buffer 6, the CPU 14 which communicates with the VC0 13 and performs control, and the CPU 14 RSSI detection and RF power control unit 15 for detecting the RSSI from the IF unit 4 and controlling the power amplifier 9 under control.
이와같이 구성된 본 발명의 작용을 설명하면 디음과 같다.Referring to the operation of the present invention configured as described above is as follows.
먼저, 수신시 안테나(ANT)를 통하여 신호가 입력되어 밴드패스필터(1), RF증 폭부(2), 믹서(3),IF부(4), IF증폭부(5)를 차례로 통하여 스피커로 수신음이 출력된다.First, upon reception, a signal is input through the antenna ANT to the speaker through the band pass filter 1, the RF amplifier 2, the mixer 3, the IF unit 4, and the IF amplifier 5 in order. The reception sound is output.
이때, 도 2에 도시된 바와같이, 상기 IF부(4)에서 수신 신호레벨을 검출하여RSSI 검출 및 RF파우어 제어부(15)를 통하여 CPU(14)에 전달한다(S1-S3단계).At this time, as shown in Figure 2, the IF unit 4 detects the received signal level and transmits it to the CPU 14 through the RSSI detection and RF power control unit 15 (steps S1-S3).
또한, 상기 RSSI 검출 및 RF파우어 제어부(15)에 의해 검출된 정보가 램(RAM)에 저장된다(S4단계)In addition, the information detected by the RSSI detection and RF power control unit 15 is stored in the RAM (step S4).
한편, 송신시에 사용자가 마이크(11)를 통하여 메시지를 전달하면 증폭부(12)를 통하여 소정레벨로 증폭되고 이어 VCO(13)와 CPU(14) 및 RSSI검출 및 RF파우어 제어부(15)에 송신 신호가 입력된다.On the other hand, if the user transmits a message through the microphone 11 at the time of transmission, it is amplified to a predetermined level through the amplifier 12, and then to the VCO 13, the CPU 14, and the RSSI detection and RF power control unit 15. The transmission signal is input.
또한, VCO(13)틀 통한 출력신호가 송신버퍼(6), 프리 앰프(7), 구동앰프(8),파우어 앰프(9) 및 로우패스필터(10)를 통하여 안테나로 송출되는데, 이때 상기 수신모드에서 검출된 정보를 근거로 CPU(14)의 RF단자를 제어하게 된다(S5단계).In addition, an output signal through the VCO 13 is transmitted to the antenna through the transmission buffer 6, the preamplifier 7, the driving amplifier 8, the power amplifier 9 and the low pass filter 10. The RF terminal of the CPU 14 is controlled based on the information detected in the reception mode (step S5).
그리고 RSSI 검출 및 RF파우어 제어부(15)에서 RF 송신 바이어스를 제어하므로 파우어 엠프(9)에서는 검출된 정보의 레벨에 맞추어 송신 RF파우어를 송출하게 된다(S6,S7단졔).Since the RSSI detection and RF power control unit 15 controls the RF transmission bias, the power amplifier 9 transmits the transmission RF power according to the level of the detected information (steps S6 and S7).
이와같이 송신이 이루어지다가 송신이 완료되면 CPU(14)는 다시 스탠바이상태에서 송수신 모드를 판별하게 되는 것이다(S8,S9단계).When the transmission is made in this manner and the transmission is completed, the CPU 14 again determines the transmission / reception mode in the standby state (steps S8 and S9).
즉, 수신부(100)에서 수신때마다 수신전파의 세기를 감지하여 이 신호의 레벨을 CPU(14)에서 A/D변환하여 이를 다시 D/A변환하여 출력하거나, 또는 임의의CPU(14)출력단자에서 수신신호의 레벨에 해당되는 만큼의 출력을 내보내게 되는 것이다.That is, the receiver 100 detects the strength of the received radio wave every time it is received and converts the level of the signal from the CPU 14 by A / D conversion and outputs it by D / A conversion again, or outputs an arbitrary CPU 14. As much as the output corresponding to the level of the received signal at the terminal.
그리고 바로 이 출력으로 송신부(200)의 구동 트랜지스터 또는 최종 파우어트랜지스터의 바이어스를 변화시켜 이에 해당되는 만큼의 송신파우어를 방출하게되는 것이다.The output power of the transmitter 200 changes the bias of the driving transistor or the final power transistor of the transmitter 200 to emit the corresponding amount of transmission power.
예를들어, 상기 수신감도의 정도를 4단계로 구분하여 적용할 경우, 다음[표1]과 같이 되는데 단, RF파우어가 500mW, 배터리가 AA사이즈×3인 경우이다.For example, when the degree of reception sensitivity is divided into four stages and applied, the following is shown in [Table 1], except that the RF power is 500 mW and the battery is AA size × 3.
상기와 같이 수신감도를 4단계로 구분하여 이에 맞게 상대에게 충분히 수신가능한 정도의 RF 파우어만 송신할 수 있는 것이다.As described above, the reception sensitivity can be divided into four stages, so that only the RF power of the receiver can be sufficiently received.
단, 상기 수신상태의 단계는 4단계에 국한되지 않고 적정단계를 정하여 결정할 수 있음은 물론이다.However, the step of the reception state is not limited to the four steps can be determined by determining the appropriate step, of course.
한편, 상기 [표 1]에서 종래와 본 발명의 배터리 사용시간을 비교해 보면,종래에는 수신이 10OmA, 송신이 500mA, 대기가 15mA일 경우 배터리 라이프 타임이30.5시간이있다.On the other hand, when comparing the battery usage time of the conventional and the present invention in the above [Table 1], conventionally, when the reception is 10mA, the transmission is 500mA, the standby is 15mA, the battery life time is 30.5 hours.
이에 비해 본 발명에서는 수신이 10OmA, 송신이 250mA, 대기시간이 15mA일 경우 배터리 라이프 타임이 46.8시간이었다.In contrast, in the present invention, when the reception is 100 mA, the transmission is 250 mA, and the standby time is 15 mA, the battery life time was 46.8 hours.
따라서, 본 발명을 적용할 경우 종래방식보다 배터리를 16.3시간 더 사용할 수 있다는 것이 판명되었다.Therefore, it has been found that when the present invention is applied, the battery can be used for 16.3 hours more than the conventional method.
이상에서 설명한 바와같은 본 발명은 수신신호에서 RSSI를 검출하여 송신 파우어를 제어함으로써 무선 송수신기의 수신되는 전파의 세기에 따라 송신때 이에 대응하는 전파의 세기만큼만 송신 RF 파우어를 송출하도록 함으로써 필요이상의 최대전력으로 송신하는 것을 방지하여 배터리를 더욱 장시간 사용할 수 있는 효과가있다.As described above, according to the present invention, the RSSI is detected from the received signal to control the transmission power, and according to the strength of the received radio wave of the radio transceiver, the transmission RF power is transmitted as much as the intensity of the corresponding radio wave when transmitting. It is effective to use the battery for a longer time by preventing transmission.
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