KR100498330B1 - Receive power compensation method for frequencies of mobile communication device - Google Patents
Receive power compensation method for frequencies of mobile communication device Download PDFInfo
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- KR100498330B1 KR100498330B1 KR10-2002-0061068A KR20020061068A KR100498330B1 KR 100498330 B1 KR100498330 B1 KR 100498330B1 KR 20020061068 A KR20020061068 A KR 20020061068A KR 100498330 B1 KR100498330 B1 KR 100498330B1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
- H03G3/20—Automatic control
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]
Abstract
본 발명은 이동 통신 단말기에서 각 채널간 수신부의 성능 편차를 줄일 수 있도록 하는 이동 통신 단말기의 주파수별 수신전력 보상 방법에 관한 것으로, 이동 통신 단말기의 기준 전력을 설정하고 주파수별 전력 보상 테이블을 초기화하는 단계와; 기준 채널에 대한 AGC(Automatic Gain Control)값을 결정하는 단계와; AGC 조정을 위한 다수의 채널을 선정하고, 그 선정된 채널의 전력이 상기 기준전력과 일치하도록, 선정된 각 채널의 AGC 값을 구하는 단계와; 상기 선정된 채널들의 AGC 값을 매핑하고 선형화하여, 선정된 채널들 사이에 있는 선정되지 않은 채널의 AGC 값을 구하는 단계와; 모든 AGC 값이 구해지면, 단말기의 내부 메모리에 이들 AGC 값을 저장하는 단계를 포함하여 이루어짐으로써 달성할 수 있다.The present invention relates to a method for compensating reception power for each frequency of a mobile communication terminal to reduce the performance deviation of a receiver between channels in a mobile communication terminal, and to set a reference power of the mobile communication terminal and initialize a power compensation table for each frequency. Steps; Determining an AGC (Automatic Gain Control) value for the reference channel; Selecting a plurality of channels for AGC adjustment and obtaining an AGC value of each selected channel so that the power of the selected channel matches the reference power; Mapping and linearizing AGC values of the predetermined channels to obtain AGC values of unselected channels among the predetermined channels; Once all AGC values are found, this can be accomplished by including storing these AGC values in the terminal's internal memory.
Description
본 발명은 이동 통신 단말기의 주파수별 수신전력 보상 방법에 관한 것으로, 특히 이동 통신 단말기에서 각 채널간 수신부의 성능 편차를 줄일 수 있도록 하는 이동 통신 단말기의 주파수별 수신전력 보상 방법에 관한 것이다.The present invention relates to a method for compensating reception power for each frequency of a mobile communication terminal, and more particularly, to a method for compensating reception power for each frequency of a mobile communication terminal to reduce the performance deviation of a receiver between channels in the mobile communication terminal.
일반적으로, 기지국에서 송출된 전력은 단말기에 수신될 때 채널(1011CH ~ 779CH)별로 수신전력(Rx Power)이 일정하지 않다. 따라서, 수신전력이 IF(Intermediate Frequency) 처리부의 수신 복조단(BBA : Base Band Analog)에서 채널별로 일정하게 입력되도록 이득(gain)을 조절하기 위해서 주파수별 수신전력 보상(CDMA Rx COMP Vs FREQ.)이라는 조정(Calibration)을 실행한다. In general, when the power transmitted from the base station is received by the terminal, the received power (Rx Power) is not constant for each of the channels 1011CH to 779CH. Therefore, in order to adjust the gain so that the reception power is inputted uniformly for each channel in the reception demodulation unit (BBA: Base Band Analog) of the IF (Intermediate Frequency) processor, reception power compensation for each frequency (CDMA Rx COMP Vs FREQ.) Carry out a calibration.
그러나, 종래 기술에서, 단말기는 실제로 조정(Calibration)을 실행하지 않고, 여러 대의 단말기에서 측정된 평균 AGC값을 일률적으로 적용함으로써, 실제로는 IF 처리부의 BBA단에 입력되는 전력(Power) 편차가 채널별로 심했다. However, in the prior art, the terminal does not actually execute calibration, and uniformly applies the average AGC value measured by several terminals, so that the power deviation input to the BBA terminal of the IF processor is actually a channel. Not so bad.
즉, 종래의 기술은 채널(1011CH ~ 779CH) 별로 수신하는 단말의 수신전력(Rx Power)이 일정하지 않은 것을 보상하기 위해 개발자가 다수의 단말기에서 측정된 평균 AGC값을 단말기의 주파수별 수신전력 보상 테이블(Calibration table)에 입력하도록 하였다. 그리고, 상기 보상 테이블을 참조하여 채널간 수신전력(Rx Power)의 편차를 일률적으로 보상했기 때문에, 각 단말기는 채널간 수신전력의 편차를 정확히 보상할 수 없었다. That is, in the related art, in order to compensate for an inconsistent Rx power of a terminal receiving for each channel (1011CH to 779CH), the developer compensates the average AGC value measured by a plurality of terminals for each frequency of the terminal. The table is entered in the calibration table. Further, since the deviation of Rx Power between channels is uniformly compensated with reference to the compensation table, each terminal cannot accurately compensate for the variation of received power between channels.
이에 따라 단말기마다 수신부의 성능에 많은 편차가 발생함으로써, 각 단말기에 대한 정확한 전력 제어가 되지 않는 문제점이 있다.As a result, many deviations occur in the performance of the receiver for each terminal, and thus there is a problem that accurate power control for each terminal is not performed.
따라서, 본 발명은 상기와 같은 종래의 문제점을 해결하기 위하여 창출한 것으로, 이동 통신 단말기에서 각 채널간 수신부의 성능 편차를 줄일 수 있도록 하는 이동 통신 단말기의 주파수별 수신전력 보상 방법을 제공함에 그 목적이 있다.Accordingly, an object of the present invention is to provide a method for compensating reception power for each frequency of a mobile communication terminal, which can be used to solve the conventional problems as described above. There is this.
이와 같은 목적을 달성하기 위한 본 발명은, 이동 통신 단말기의 기준 전력을 설정하고 주파수별 전력 보상 테이블을 초기화하는 단계와; 기준 채널에 대한 AGC(Automatic Gain Control)값을 결정하는 단계와; AGC 조정을 위한 다수의 채널을 선정하고, 그 선정된 채널의 전력이 상기 기준전력과 일치하도록, 선정된 각 채널의 AGC 값을 구하는 단계와; 상기 선정된 채널들의 AGC 값을 매핑하고 선형화하여, 선정된 채널들 사이에 있는 선정되지 않은 채널의 AGC 값을 구하는 단계와; 모든 AGC 값이 구해지면, 단말기의 내부 메모리에 이들 AGC 값을 저장하는 단계를 포함하여 이루어진 것을 특징으로 한다.The present invention for achieving the above object comprises the steps of setting the reference power of the mobile communication terminal and the power compensation table for each frequency; Determining an AGC (Automatic Gain Control) value for the reference channel; Selecting a plurality of channels for AGC adjustment and obtaining an AGC value of each selected channel so that the power of the selected channel matches the reference power; Mapping and linearizing AGC values of the predetermined channels to obtain AGC values of unselected channels among the predetermined channels; Once all AGC values have been obtained, the method comprises storing these AGC values in the internal memory of the terminal.
본 발명은 이동 통신 단말기의 수신부 채널(1011CH ~ 779CH)간 수신전력(Rx Power)의 편차를 줄이기 위해, 모든 단말기마다 주파수별 수신전력 보상 조정(Calibration)을 실행함으로써, 수신전력(Rx Power)이 수신 복조단에 채널 별로 일정하게 입력 되도록 이득(gain)을 조절하도록 함으로써, 종래 단말기마다 다르게 발생하는 채널간 수신전력(Rx Power)의 편차를 줄일 수 있도록 하는 특징이 있다.According to the present invention, in order to reduce the deviation of Rx power between the receiver channels 1011CH to 779CH of the mobile communication terminal, the received power Rx power is increased by performing the reception power compensation calibration for each terminal for each frequency. By adjusting a gain to be constantly input to the receiving demodulator for each channel, there is a feature to reduce the variation in Rx power between channels that occurs differently for each conventional terminal.
다시 말해, 종래에는 개발자가 다수개의 단말기에 대한 측정치의 평균 이득값(AGC)을 일률적으로 각 단말기의 주파수별 수신전력 보상 테이블에 적용함으로써, 단말기마다 수신부 성능에 많은 차이가 발생하는 문제점을 보완하기 위하여, 본 발명에서는 각 단말기에 대해서 직접 주파수별 수신전력 보상을 빠르게 수행할 수 있도록 하는 방법을 그 요지로 하고 있다.In other words, in the related art, the developer uniformly applies the average gain value (AGC) of the measured values for a plurality of terminals to the reception power compensation table for each terminal of each terminal, thereby compensating for the problem that a large difference in receiver performance occurs for each terminal. In order to solve the problem, the present invention provides a method for quickly performing frequency-dependent reception power compensation for each terminal.
이하, 본 발명의 바람직한 실시예를 첨부한 도면을 참조하여 설명하기로 한다.Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
도1은 본 발명에 의한 이동 통신 단말기의 주파수별 수신전력 보상 방법을 보인 순서도로서, 우선 단말기는 내부 메모리인 NV(Non Volatile) 메모리에서 각 주파수별 수신전력 보상 테이블을 초기화(Initialize Compensation Table)하고(S101), 보상 조정할 파워 테이블 인덱스를 설정한다. 즉, 단말기는 Power Range(약, 25~104)를 N(N=16)등분하는 파워 테이블을 설정하며, 파워 테이블 인덱스의 등분된 구간중 하나를 선택하여 특정 전력 레벨 즉, '기준전력' 값을 설정한다(S102).1 is a flowchart illustrating a method for compensating reception power by frequency of a mobile communication terminal according to the present invention. First, the terminal initializes a reception power compensation table for each frequency in an NV (Non Volatile) memory, which is an internal memory. In step S101, a power table index to be adjusted is set. That is, the terminal sets a power table for dividing the power range (about 25 to 104) by N (N = 16), and selects one of the divided sections of the power table index to specify a specific power level, that is, a 'reference power' value. Set (S102).
다음, 단말기의 저잡음 증폭기(LNA : Low Noise Amplifier)의 온/오프 상태를 체크하여, 만일 저잡음 증폭기가 오프(off)되어 있을 경우 온(on)으로 설정한다(S103). 이상은 주파수별 수신전력 보상을 위한 초기화 작업이다.Next, the on / off state of the low noise amplifier (LNA) of the terminal is checked and set to on if the low noise amplifier is off (S103). The above is an initialization operation for receiving power compensation for each frequency.
다음, 상기 초기화 작업이 완료되면, 상기 NV 메모리의 다른 영역에 저장된 기준 채널의 수신전력 조정(Rx Calibration)값을 읽어(S104), 수신전력 조정에 적용할 AGC(이하, '기준 AGC'라 함)값을 결정하고(S105), 조정(Calibration)을 실행할 채널을 선정한다(S106).Next, when the initialization operation is completed, the RC calibration value of the reference channel stored in another area of the NV memory is read (S104), and AGC to be applied to the reception power adjustment (hereinafter referred to as 'reference AGC'). Value is determined (S105), and a channel to be calibrated is selected (S106).
즉, 전체 주파수범위에서 대표적으로 N개(16개)의 채널을 설정하여, 기준 채널의 수신전력와 동일한 파워를 얻을 수 있는 만큼의 각 채널의 이득(AGC)값을 결정하기 위한 것이다.That is, by setting N (16) channels representatively in the entire frequency range, it is to determine the gain (AGC) value of each channel as much as can obtain the same power as the received power of the reference channel.
상기 기준채널의 수신전력 조정값은 BBA단에 수신되는 특정 채널의 전력 레벨을 일정하게 맞추기 위해 Rx Linear Calibration을 실행하여 구해진 AGC 값이다.따라서, N개의 각 채널의 수신전력이 기준전력과 동일하게 되도록, 각 채널에 대해 '수신전력 보상 조정'을 수행하는데, 기준 AGC를 업(UP) 또는 다운(DOWN) 조정하고, 조정된 AGC를 해당 채널의 AGC로 설정한다.(S107), 그리고, 상기 기준 AGC와 선정된 채널의 조정된 AGC와의 차이 값을 구한다(S108). 즉, 기준 AGC 값에 상기 차이값을 가감하여 각 채널에 대한 AGC 값을 보상한다.The received power adjustment value of the reference channel is an AGC value obtained by performing Rx linear calibration to uniformly adjust the power level of a specific channel received at the BBA stage. Therefore, the received power of each of the N channels is equal to the reference power. Preferably, 'receive power compensation adjustment' is performed for each channel, and the reference AGC is adjusted up (UP) or down (DOWN), and the adjusted AGC is set to the AGC of the corresponding channel (S107). The difference value between the reference AGC and the adjusted AGC of the selected channel is obtained (S108). That is, the AGC value for each channel is compensated by adding or subtracting the difference value to the reference AGC value.
상기 기준 채널에 대하여 수신전력를 보정할 채널의 이득 값을 구하는 과정은 설정된 채널의 수(예:16개) 만큼 계속 반복하여(S109), 그 보정 값을 상기 주파수별 보상 테이블에 매핑하고, 그 대표 주파수 채널의 사이 값에 대해서는 선형(Linear)화하여 보상을 한다.이러한 과정들(S107, S108)은 선정된 채널 수(N)만큼 반복되며, 상기 과정(S107, S108)의 반복을 통해, 구해진 각 채널의 AGC 값들은 상기 주파수별 보상 테이블에 저장되고, N개의 채널 이외 채널의 AGC 값은 상기 N개 채널의 AGC를 매핑하고 선형화(Linearization)하여 구한다(S110).상기 선형화 과정은 기준채널의 AGC 값과 16개의 채널에 대한 조정(Calibration) AGC 값의 차에 의해 발생하는 16개의 point 값들을 맵핑하고 선형화 한다. 16 point 값들의 사이에 있는 채널들의 AGC 값은 상기 16 point 값 중에서 이웃하는 가장 근접한 point 의 AGC값을 채택한다.The process of obtaining a gain value of a channel for correcting reception power with respect to the reference channel is repeated as many as the set number of channels (e.g., 16) (S109), and the correction value is mapped to the frequency-specific compensation table, and the representative The values between the frequency channels are linearized to compensate. These processes S107 and S108 are repeated by a predetermined number of channels N, and are obtained through repetition of the processes S107 and S108. AGC values of each channel are stored in the compensation table for each frequency, and AGC values of channels other than N channels are obtained by mapping and linearizing AGCs of the N channels (S110). Calibration of 16 AGC values and 16 channels Maps and linearizes 16 point values generated by the difference between AGC values. The AGC value of channels between 16 point values adopts the AGC value of the neighboring point among the 16 point values.
마지막으로, 상기 선형화를 포함한 모든 주파수 대역내의 채널에 대한 수신전력 조정 AGC 값이 구해지면(S111), 그 조정된 AGC 값들을 단말기의 NV 메모리에 기록(Writing) 한다(S112).Finally, when the received power adjustment AGC values for the channels in all frequency bands including the linearization are obtained (S111), the adjusted AGC values are written to the NV memory of the terminal (S112).
이상으로, 본 발명은 각 단말기의 수신 채널(1011CH ~ 779CH)에 따라 조정된 AGC 값을 직접 적용함으로써, 전체 채널에서 일정한 전력 레벨이 되도록 주파수별 수신전력 보상을 수행하게 됨으로써, 각 수신부의 채널간 성능의 편차를 줄일 수 있게 된다.As described above, according to the present invention, by directly applying the AGC value adjusted according to the reception channels 1011CH to 779CH of each terminal, the reception power compensation for each frequency is performed to achieve a constant power level in all channels, and thus, between channels of each receiving unit. This can reduce the variation in performance.
이상에서 설명한 바와 같이 본 발명 이동 통신 단말기의 주파수별 수신전력 보상 방법은, 다수의 단말기에 대한 수신부 특성에 맞는 주파수별 수신전력 보상을 실행할 수 있도록 함으로써, 다수의 단말기에 대하여 수신부의 채널간 수신전력의 편차를 보상하여, 단말기의 수신 성능을 향상시킬 수 있도록 하는 효과가 있다.As described above, in the method of compensating reception power for each frequency of a mobile communication terminal of the present invention, it is possible to perform the reception power compensation for each frequency corresponding to the characteristics of a receiver for a plurality of terminals, thereby receiving power between channels of a receiver for a plurality of terminals. By compensating for the deviation of the, it is effective to improve the reception performance of the terminal.
도 1은 본 발명에 의한 이동 통신 단말기의 주파수별 수신전력 보상 방법을 보인 순서도.1 is a flowchart illustrating a method for compensating reception power for each frequency of a mobile communication terminal according to the present invention.
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KR100483287B1 (en) * | 2003-04-25 | 2005-04-15 | 엘지전자 주식회사 | Average power level search apparatus and method in system using multi look up table |
CN101203039B (en) * | 2006-12-15 | 2011-07-06 | 华为技术有限公司 | Method, apparatus and network for system initiation of wireless area network |
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CN101369835B (en) * | 2008-10-14 | 2013-04-24 | 华为终端有限公司 | Gain compensation method and device of wireless terminal |
CN102324991B (en) * | 2011-08-16 | 2013-11-06 | 惠州Tcl移动通信有限公司 | Method for calibrating mobile terminal to transmit power in global system for mobile communication (GSM) frequency band |
CN110290578B (en) * | 2018-03-19 | 2021-09-03 | 大唐移动通信设备有限公司 | Method and terminal for acquiring noise power |
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KR100223369B1 (en) * | 1996-12-19 | 1999-10-15 | 윤종용 | Apparatus and method for automatically contwlling gain in multic-channel communication system |
KR19980066108A (en) * | 1997-01-20 | 1998-10-15 | 김광호 | Received signal power level tracking device and method in code division multiple access communication system |
KR20010064868A (en) * | 1999-12-20 | 2001-07-11 | 윤종용 | Apparatus for compensating received signal strength indicator according to temperature and method thereof |
US6388526B1 (en) * | 2000-07-06 | 2002-05-14 | Lucent Technologies Inc. | Methods and apparatus for high performance reception of radio frequency communication signals |
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