WO2001048933A1 - Recepteur et procede de commande de gain - Google Patents
Recepteur et procede de commande de gain Download PDFInfo
- Publication number
- WO2001048933A1 WO2001048933A1 PCT/JP2000/009002 JP0009002W WO0148933A1 WO 2001048933 A1 WO2001048933 A1 WO 2001048933A1 JP 0009002 W JP0009002 W JP 0009002W WO 0148933 A1 WO0148933 A1 WO 0148933A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- electric field
- field strength
- gain coefficient
- gain control
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 8
- 230000005684 electric field Effects 0.000 claims description 84
- 238000004891 communication Methods 0.000 claims description 12
- 238000005259 measurement Methods 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 21
- 238000010586 diagram Methods 0.000 description 20
- 230000006866 deterioration Effects 0.000 description 4
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
- H03G3/3068—Circuits generating control signals for both R.F. and I.F. stages
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/18—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging
- H03M1/181—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values
- H03M1/183—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values the feedback signal controlling the gain of an amplifier or attenuator preceding the analogue/digital converter
- H03M1/185—Automatic control for modifying the range of signals the converter can handle, e.g. gain ranging in feedback mode, i.e. by determining the range to be selected from one or more previous digital output values the feedback signal controlling the gain of an amplifier or attenuator preceding the analogue/digital converter the determination of the range being based on more than one digital output value, e.g. on a running average, a power estimation or the rate of change
-
- 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
-
- 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
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/005—Control of transmission; Equalising
-
- 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
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
Definitions
- the present invention relates to a receiver and a gain control method used in a digital radio communication system such as a mobile phone and a car phone.
- base stations installed in each cell allocate radio channels to multiple communication terminals in the cell and simultaneously Perform wireless communication.
- FIG. 1 is a diagram showing a configuration of a digital wireless communication system.
- base station 11 is located in cell 21
- base station 12 is located in cell 22
- base station 13 is located in cell 23, respectively.
- mobile stations 3 1, 3 2, 3 3 are currently in cell 21 and are performing wireless communication with base station 11.
- FIG. 2 is a diagram showing division among signals received by the mobile station 31 in FIG.
- the signal transmitted from the base station 11 to the mobile station 31 communicating with the base station 11 wirelessly is the desired signal S, but is received by the mobile station 31.
- noise N is included.
- the received signal R includes, as an interference signal I, an interference signal I mtra of the own cell transmitted from the base station 11 to the mobile stations 32 , 33 other than the own station. And other cell interference signals I int ⁇ transmitted from base stations 12 and 13 other than the communication partner.
- the receiving device mounted on the mobile station 31 performs automatic gain control (hereinafter referred to as “AGC:”) on the received signal, converts it to a digital signal, and includes it in the received signal.
- AGC automatic gain control
- the desired signal is demodulated to extract the received data.
- the AGC is a control for setting the electric field strength of the received signal to a preset target value for the purpose of improving the accuracy of the digital conversion of the received signal.
- the receiving RF section 52 amplifies the radio frequency signal received by the antenna 51 and converts the signal to baseband.
- the AGC unit 53 controls the gain of the baseband signal output from the reception RF unit 52 according to the gain coefficient.
- the A / D conversion unit 54 converts the output signal of the AGC unit 53 into a digital signal.
- the despreading unit 55 multiplies the output signal of the AZD conversion unit 54 by the same spreading code as that on the transmitting side.
- RAKE receiving section 56 RAKE combines the output signal of despreading section 55.
- the demodulation unit 57 demodulates the output signal of the RAKE reception unit 56 and extracts the received data.
- the electric field strength measuring section 58 measures the electric field strength of the baseband signal output from the receiving RF section 52.
- the electric field strength can be obtained by placing an antenna whose effective length is known during electrolysis and measuring the voltage induced on this antenna.
- the AZD conversion section 59 converts the measurement result of the electric field strength measured by the electric field strength measurement section 58 into a digit signal, and outputs the absolute electric field strength (S + I + N) abs of the received signal.
- the determination unit 60 determines the magnitude relationship between the absolute electric field strength (S + I + N) abs of the received signal output from the AZD conversion unit 59 and the target value t. Note that a signal amplitude X that can be expressed in bits (hereinafter, abbreviated as “amplitude X”) or the like is used as the target value t.
- the gain coefficient calculation unit 61 calculates the AGC gain coefficient correction value (hereinafter referred to as the gain coefficient 3) based on the determination result of the determination unit 60, as shown in the relationship between the input electric field strength and the gain coefficient shown in FIG.
- the value (3 + AG or 3 ⁇ AG) obtained by increasing or decreasing AG is output as a new gain coefficient. Specifically, if the absolute electric field strength (S + I + N) abs of the received signal is equal to or greater than the target value t, the gain correction value AG is added to the previous gain coefficient i3, otherwise, the previous gain coefficient The gain correction value AG is subtracted from the gain coefficient / 3.
- the gain correction value AG is a preset value.
- the DZA conversion unit 62 converts the gain coefficient calculated by the gain coefficient calculation unit 61 into an analog value and outputs the analog value to the AGC unit 53.
- the conventional receiving apparatus uses the AGC that performs closed-loop control to improve the accuracy when converting the received signal into the digital signal.
- the target value t is set to be larger than the amplitude X, and the clipping is performed in anticipation of the interference signal I and the noise N.
- AGC is performed to receive (vertical distance b)
- the desired signal S is clipped (vertical distance c)
- clipping means that the peak of a signal or speech syllable is cut off to the extent that it can be detected during transmission.
- the above-mentioned conventional receiving apparatus does not consider the ratio of the desired signal included in the received signal, and calculates the gain coefficient based on the electric field strength of the received signal.
- reception quality is degraded. Disclosure of the invention
- An object of the present invention is to perform AGC with high accuracy and prevent deterioration of reception quality. And a gain control method.
- This object is achieved by obtaining the electric field strength of a signal obtained by removing the interference signal from the received signal based on the desired signal-to-interference signal ratio and the received electric field strength, and calculating a gain coefficient based on the electric field strength.
- Figure 1 is a diagram showing the configuration of a digital wireless communication system.
- FIG. 2 is a diagram showing division among signals received by the mobile station in FIG. 1,
- FIG. 3 is a block diagram showing a configuration of a conventional receiving apparatus.
- FIG. 4 is a diagram showing a relationship between an input electric field strength and a gain coefficient in a conventional receiver
- FIG. 5A is a diagram showing signal components before and after AGC and AZD conversion of the conventional receiving device
- FIG. 5B is a diagram showing signal components before and after AGC and AZD conversion of the conventional receiving device
- FIG. FIG. 7 is a block diagram illustrating a configuration of a receiving device according to the first embodiment of the present invention.
- FIG. 7 is a diagram illustrating a relationship between an input electric field strength and a gain coefficient in the receiving device according to the first embodiment of the present invention.
- FIG.8A is a diagram showing AGC and signal components before and after AZD conversion of the receiving apparatus according to Embodiment 1 of the present invention.
- FIG.8B is a diagram showing AGC and signal components before and after AZD conversion of the receiving apparatus according to Embodiment 1 of the present invention.
- FIG. 9 is a block diagram illustrating a configuration of a receiving apparatus according to Embodiment 2 of the present invention
- FIG. 10 is a diagram illustrating a relationship between an input electric field strength and a gain coefficient in the receiving apparatus according to Embodiment 2 of the present invention. Figures shown, and
- FIG. 11A is a diagram showing signal components before and after AGC and AZD conversion of the receiving apparatus according to Embodiment 2 of the present invention.
- FIG. 11B shows AGC and AZD conversion of the receiving apparatus according to Embodiment 2 of the present invention. It is a figure which shows the signal component before and behind.
- FIG. 6 is a block diagram showing the configuration of the receiving apparatus according to Embodiment 1 of the present invention.
- the receiving RF section 102 amplifies a radio frequency signal received by the antenna 101 and converts the signal to baseband.
- the AGC unit 103 controls the gain of the baseband signal output from the reception RF unit 102 according to the gain coefficient input from the D / A conversion unit 114 described later.
- the AZD converter 104 converts the output signal of the AGC 103 into a digital signal.
- Despreading section 105 multiplies the output signal of AZD conversion section 104 by the same spreading code as that on the transmitting side.
- the interference canceller 106 removes the stray signal I from the output signal of the despreading unit 105. Note that Chiwara Canceller 106 cannot remove noise N from the output signal of despreading unit 105.
- the demodulation unit 107 demodulates the output signal of the interference canceller 106 and extracts received data.
- the SINR measuring section 108 measures the SINR from the output signal of the AZD converting section 104 and the output signal of the interference canceller 106 by the following equation (1).
- the electric field strength measuring section 109 measures the electric field strength of the baseband signal output from the receiving RF section 102. It should be noted that the electric field strength is known for its effective length during electrolysis.
- the AZD conversion unit 110 converts the measurement result of the electric field strength measured by the electric field strength measurement unit 109 into a digital signal, and outputs the absolute electric field strength (S + I + N) abs of the received signal. Is output.
- the reason why the noise N remains in the absolute electric field strength (S + N) abs of the desired signal S is that the noise N cannot be removed by the Chihatsu canceller 106.
- the determination unit 112 determines the magnitude relationship between the absolute electric field intensity (S + N) abs of the desired signal S output from the absolute electric field intensity calculation unit 111 and the target value t.
- the gain coefficient calculation unit 113 calculates a new gain coefficient based on the judgment result of the judgment unit 112 based on the value obtained by increasing or decreasing the gain correction value AG to the previous gain coefficient. Output.
- the gain correction value AG is added to the previous gain coefficient ⁇ so that the desired signal S is not clipped.
- the gain correction value AG is subtracted from the previous gain coefficient ⁇ in order to increase the bit accuracy of the desired signal S.
- the DZA conversion section 114 converts the gain coefficient output from the gain coefficient calculation section 113 into an analog value, and outputs the analog value to the AGC section 103.
- the gain coefficient is calculated based on the absolute electric field strength (S + N + I) abs of the received signal in the prior art, but the output signal of the The gain coefficient can be calculated based on the absolute electric field strength (S + N) abs of the desired signal S.
- FIG. 8A and 8B are diagrams showing signal components before and after AGC and AZD conversion of the receiving apparatus according to the present embodiment.
- FIG. 8A shows a case where the absolute electric field strength (S + N) abs of the desired signal S is equal to or larger than the target value t
- FIG. 8B shows an absolute electric field strength (S + N) of the desired signal S. The case where abs is less than the target value t is shown.
- the received signal 201 can be reduced in electric field strength by the signal 80 (: section 103 so that the desired signal S does not clip.
- the output signal 202 of the AGC section 103 is The signal is converted into a digital signal by the A / D converter 104. At that time, a part of the interference signal I and a part of the noise N are clipped (vertical distance a).
- the desired signal S included in the output signal 203 of the AZD conversion unit 104 is not clicked and has sufficient bit accuracy (vertical distance b), so that the reception quality does not deteriorate. .
- the electric field intensity of the received signal 2 11 can be increased by the AGC section 103 in order to increase the bit precision of the desired signal S.
- the output signal 2 122 of the 80 ⁇ section 103 is converted into a digital signal by the AZD conversion section 104.
- a part of the interference signal I and a part of the noise N are clipped (vertical distance c).
- the desired signal S included in the output signal 2 13 of the AZD converter 104 is not clipped and has sufficient bit accuracy (vertical distance d), so that the reception quality does not deteriorate. .
- AGC can be performed with high accuracy, and deterioration of the reception quality can be prevented.
- FIG. 9 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 2 of the present invention. Note that, in the receiving apparatus of FIG. 8, the same reference numerals as those in FIG. 6 denote the same parts, and a description thereof will be omitted.
- the receiving apparatus in FIG. 9 is different from the receiving apparatus in FIG. 6 in that the number of SINR measuring sections 108 is equal to the number of users, and the adding section 301 is added.
- a desired signal of the user k included in the received signal is S k
- an interference signal for the user k is I k
- a noise for the user k is N k .
- Each SINR measuring section 108 outputs the output signal (S k + I k + N k ) of the AZD converting section 104 and the desired signal S for each user in the own cell output from the interference canceller 106. From k , the SINR of the corresponding user k is measured by the following equation (3).
- the electric field strength measuring section 109 measures the electric field strength of the baseband signal output from the receiving RF section 102 for each user.
- the AZD converter 110 converts the measurement result of the electric field strength of each user measured by the electric field strength measuring section 109 into a digit signal, and outputs the absolute electric field strength (S k + I k + N k ) Output abs .
- the adding section 301 divides the absolute electric field strength (S k +) of the desired signal S k of each user in the own cell calculated by the absolute electric field strength calculating section 111 .
- N k ) abs are all added, and the total value ⁇ (S + N) abs is output.
- the determination unit 1 1 2 calculates the total value of the absolute electric field strength of the desired signal S k output from the addition unit 3 0 ⁇ (S + N) abs And the target value t are determined.
- the gain coefficient calculating unit 113 adds a new value ( ⁇ + AG or ⁇ AG) obtained by increasing or decreasing the gain correction value AG to the previous gain coefficient based on the determination result of the determination unit 112. Output as gain coefficient.
- the gain correction value AG is added to the gain coefficient a.
- the total value of the absolute electric field strengths of the desired signal S k ⁇ (S + N) abs is less than the target value t, to improve the bit accuracy of the desired signal of all users in the own cell, Subtract the gain correction value AG from the gain coefficient a.
- the gain coefficient is calculated based on the absolute electric field strength (S + N) abs of the received signal in the conventional technology, but the output signal of the interference canceller is used for each user. Accordingly, the gain coefficient can be calculated based on the total value ⁇ ⁇ (S + N) abs of the absolute electric field strength of the desired signal S k .
- the interference signal I is divided into a thousand ⁇ No. I inte r of the interference signal I intra and other cells of the own cell. Since the interference signal I mtfa of the own cell includes a desired signal other than that of the user, the receiving apparatus of the present embodiment does not clip the interference signal I lntra of the own cell, and outputs the interference signal of another cell. Perform AGC so that only I Inte r is clipped.
- FIGS. 11A and 11B are diagrams showing signal components before and after AGC and AZD conversion of the receiving apparatus according to the present embodiment.
- FIG. 11A shows a case where the total value ⁇ (S + N) abs of the absolute electric field strengths of the desired signal S k is equal to or larger than the target value t
- FIG. 11B shows an absolute value of the desired signal S k . This shows the case where the total electric field strength ⁇ (S + N) abs is less than the target value t.
- the electric field strength of the received signal 401 can be reduced by the AGC section 103 so that the desired signal S is not clipped.
- the output signal 402 of the AGC section 103 is converted into a digital signal by the AZD conversion section 104. At that time, Ten
- Interference signal I Into Le is clipped (vertical axial distance a).
- the desired signal S and the interference signal Imtra of the own cell included in the output signal 403 of the AZD converter 104 are not clipped and have sufficient bit precision (vertical axis distance b). However, the reception quality does not deteriorate.
- the electric field strength of the received signal 4 11 can be increased by the AGC section 103 in order to increase the bit precision of the desired signal S.
- the output signal 412 of the AGC unit 103 is converted to a digital signal by the AZD converter 104.
- the interference signal I inter of another cell is clipped (vertical distance c).
- the desired signal S and the interference signal I intra of the own cell included in the output signal 4 13 of the AZD converter 104 are not clipped and have sufficient bit precision (vertical axis distance d). Therefore, the reception quality does not deteriorate.
- AGC can be performed with high accuracy and deterioration of reception quality is prevented. be able to.
- MUD Multi user Detection
- the target value can be set as appropriate.
- the target value is a signal amplitude that can be expressed by bits, or a case that a value obtained by subtracting a margin from the signal amplitude that can be expressed by bits is used as the target value.
- the receiving device of each of the above embodiments can be mounted on a base station device and a communication terminal device of a digital wireless communication system.
- the interference signal is removed from the reception signal by the desired signal-to-interference signal ratio and the reception electric field strength.
- AGC By calculating the electric field strength of the received signal and calculating the gain coefficient based on the electric field strength, AGC can be performed with high accuracy, and deterioration of the reception quality can be prevented.
- the present specification is based on Japanese Patent Application No. 11-3755 262 filed on Feb. 28, 1999. This content is included here.
- the present invention is suitable for use in a digital wireless communication system such as a mobile phone and a car phone.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Theoretical Computer Science (AREA)
- Circuits Of Receivers In General (AREA)
- Noise Elimination (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Mobile Radio Communication Systems (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20000981833 EP1156590A1 (en) | 1999-12-28 | 2000-12-19 | Receiver and gain control method |
AU18951/01A AU1895101A (en) | 1999-12-28 | 2000-12-19 | Receiver and gain control method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11-375262 | 1999-12-28 | ||
JP37526299A JP2001189692A (ja) | 1999-12-28 | 1999-12-28 | 受信装置及び利得制御方法 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001048933A1 true WO2001048933A1 (fr) | 2001-07-05 |
Family
ID=18505238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/009002 WO2001048933A1 (fr) | 1999-12-28 | 2000-12-19 | Recepteur et procede de commande de gain |
Country Status (6)
Country | Link |
---|---|
US (1) | US20020183028A1 (ja) |
EP (1) | EP1156590A1 (ja) |
JP (1) | JP2001189692A (ja) |
CN (1) | CN1341296A (ja) |
AU (1) | AU1895101A (ja) |
WO (1) | WO2001048933A1 (ja) |
Cited By (1)
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WO2003041296A1 (en) * | 2001-10-29 | 2003-05-15 | Nokia Corporation | Method for gain control and corresponding receiving unit |
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JP2000252952A (ja) * | 1999-03-02 | 2000-09-14 | Nec Corp | Cdma受信機及びその受信方法 |
US7130364B2 (en) * | 2002-01-31 | 2006-10-31 | Nokia Corporation | Interference dependent ADC headroom adjustment |
JP3715606B2 (ja) | 2002-09-10 | 2005-11-09 | 株式会社東芝 | 無線通信機及びその制御方法 |
US8428181B2 (en) | 2002-12-02 | 2013-04-23 | Research In Motion Limited | Method and apparatus for optimizing transmitter power efficiency |
US7738848B2 (en) * | 2003-01-14 | 2010-06-15 | Interdigital Technology Corporation | Received signal to noise indicator |
US20040235423A1 (en) * | 2003-01-14 | 2004-11-25 | Interdigital Technology Corporation | Method and apparatus for network management using perceived signal to noise and interference indicator |
US7477710B2 (en) * | 2004-01-23 | 2009-01-13 | Tensorcomm, Inc | Systems and methods for analog to digital conversion with a signal cancellation system of a receiver |
US7333563B2 (en) | 2004-02-20 | 2008-02-19 | Research In Motion Limited | Method and apparatus for improving power amplifier efficiency in wireless communication systems having high peak to average power ratios |
JP4432530B2 (ja) * | 2004-02-23 | 2010-03-17 | パナソニック株式会社 | デジタル信号処理アンプ |
US6956517B1 (en) * | 2004-06-12 | 2005-10-18 | L-3 Integrated Systems Company | Systems and methods for multi-channel analog to digital conversion |
KR101010042B1 (ko) | 2006-06-14 | 2011-01-21 | 리서치 인 모션 리미티드 | 스위처 조정 파워 증폭기 모듈의 개선된 제어 |
WO2007143843A1 (en) * | 2006-06-14 | 2007-12-21 | Research In Motion Limited | Input drive control for switcher regulated power amplifier modules |
US8761305B2 (en) | 2006-06-14 | 2014-06-24 | Blackberry Limited | Input drive control for switcher regulated power amplifier modules |
US7693501B2 (en) * | 2006-12-21 | 2010-04-06 | Intel Corporation | Techniques to deterministically reduce signal interference |
WO2008145799A1 (en) * | 2007-05-25 | 2008-12-04 | Nokia Corporation | Interference in communication devices |
JP4911088B2 (ja) | 2008-03-21 | 2012-04-04 | 富士通株式会社 | 無線通信装置および無線通信方法 |
KR101498286B1 (ko) * | 2008-05-23 | 2015-03-03 | 삼성전자주식회사 | 무선 통신 시스템에서의 자동 이득 제어 장치 및 방법 |
US8078130B2 (en) | 2008-12-23 | 2011-12-13 | L-3 Communications Integrated Systems L.P. | Systems and methods for interference cancellation |
US8081946B2 (en) | 2008-12-23 | 2011-12-20 | L-3 Communications Integrated Systems L.P. | Interference cancellation for reconfigurable direct RF bandpass sampling interference cancellation |
US8620238B2 (en) | 2010-07-23 | 2013-12-31 | Blackberry Limited | Method of power amplifier switching power control using post power amplifier power detection |
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CN102724450B (zh) * | 2012-04-16 | 2018-01-02 | 中兴通讯股份有限公司 | 电视无线广播信号的接收方法及装置 |
CN102638883B (zh) * | 2012-05-04 | 2015-09-09 | 华为技术有限公司 | 一种实现agc增益档位控制的方法及装置 |
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US6115409A (en) * | 1999-06-21 | 2000-09-05 | Envoy Networks, Inc. | Integrated adaptive spatial-temporal system for controlling narrowband and wideband sources of interferences in spread spectrum CDMA receivers |
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1999
- 1999-12-28 JP JP37526299A patent/JP2001189692A/ja active Pending
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2000
- 2000-12-19 CN CN00803990A patent/CN1341296A/zh active Pending
- 2000-12-19 AU AU18951/01A patent/AU1895101A/en not_active Abandoned
- 2000-12-19 US US09/913,848 patent/US20020183028A1/en not_active Abandoned
- 2000-12-19 EP EP20000981833 patent/EP1156590A1/en not_active Withdrawn
- 2000-12-19 WO PCT/JP2000/009002 patent/WO2001048933A1/ja not_active Application Discontinuation
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JPH0779171A (ja) * | 1993-09-08 | 1995-03-20 | Nec Ic Microcomput Syst Ltd | 受信機 |
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JP7052851B2 (ja) * | 2015-10-07 | 2022-04-12 | 住友電気工業株式会社 | 炭化珪素エピタキシャル基板および炭化珪素半導体装置の製造方法 |
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WO2003041296A1 (en) * | 2001-10-29 | 2003-05-15 | Nokia Corporation | Method for gain control and corresponding receiving unit |
Also Published As
Publication number | Publication date |
---|---|
CN1341296A (zh) | 2002-03-20 |
US20020183028A1 (en) | 2002-12-05 |
EP1156590A1 (en) | 2001-11-21 |
AU1895101A (en) | 2001-07-09 |
JP2001189692A (ja) | 2001-07-10 |
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