WO2005069496A1 - 受信装置及び受信方法 - Google Patents
受信装置及び受信方法 Download PDFInfo
- Publication number
- WO2005069496A1 WO2005069496A1 PCT/JP2005/000486 JP2005000486W WO2005069496A1 WO 2005069496 A1 WO2005069496 A1 WO 2005069496A1 JP 2005000486 W JP2005000486 W JP 2005000486W WO 2005069496 A1 WO2005069496 A1 WO 2005069496A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reception
- signal
- reception quality
- unit
- level
- Prior art date
Links
Classifications
-
- 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
Definitions
- the present invention relates to a receiving apparatus and a receiving method, and in particular, a mobile communication terminal apparatus including a mobile phone, a receiving apparatus such as a base station apparatus that performs wireless communication with the mobile communication terminal apparatus, and a receiving method.
- a mobile communication terminal apparatus including a mobile phone
- a receiving apparatus such as a base station apparatus that performs wireless communication with the mobile communication terminal apparatus
- a receiving method such as a base station apparatus that performs wireless communication with the mobile communication terminal apparatus
- a modulation scheme and a coding rate are set for line quality (hereinafter, simply referred to as SNR (Signal to Noise Ratio)) which constantly changes according to an environment, and adaptive transmission to obtain an optimal transmission rate.
- a modulation method is known (for example, refer to Patent Document 1.) o
- a receiving apparatus 1 employing this adaptive modulation method receives antenna elements (hereinafter, simply referred to as antennas) 11, and receives signals. It includes a processing unit 12, a reception baseband signal processing unit 13, and an SNR measurement unit 14.
- the transmitting apparatus 2 that transmits a signal to the receiving apparatus 1 includes an antenna 21, a transmission processing unit 22, a transmission baseband signal processing unit 23, and a modulation scheme control unit 24.
- the modulation scheme control unit 24 controls the optimal transmission rate and modulation scheme based on the SNR notification signal.
- the SNR notification signal is generated based on the SNR measured by the SNR measuring section 14 of the receiving device 1 for the demodulated signal power.
- the SNR notification signal is transmitted from the receiving device 1 to the transmitting device 2 by a wireless device (not shown).
- the transmission baseband signal processing unit 23 modulates information to be transmitted according to the transmission rate and modulation method determined by the modulation method control unit 24, and generates a transmission baseband signal.
- the transmission processing unit 22 modulates the transmission baseband signal into a radio signal, and performs a filtering process and an amplification process on the radio signal.
- the antenna 21 transmits a radio signal that has been finally subjected to an amplifier process.
- the radio signal received by the antenna 11 Entered in 2.
- the reception processing unit 12 converts a radio signal into a reception baseband signal.
- the reception processing unit 12 includes a multiplication processing unit 12a, a filter processing unit 12b, and a carrier signal generation unit 12c.
- the carrier signal generator 12c can oscillate a carrier having a desired frequency.
- the multiplication processing unit 12a generates a reception baseband signal by multiplying the radio signal by the carrier signal.
- Filtering section 12b filters the received baseband signal.
- the reception baseband signal converted by the reception processing unit 12 is input to the reception baseband signal processing unit 13, as shown in FIG.
- the reception baseband signal processing unit 13 performs demodulation processing according to a modulation method appropriate for the reception baseband signal, and the demodulated signal generated by this demodulation processing is input to the SNR measurement unit 14.
- the SNR measuring unit 14 the received SNR of the demodulated signal power is measured.
- the SNR is an index of the reception quality in the receiving apparatus 1.
- the main factors that degrade the SNR are the noise of the propagation path and the noise of the receiver 1. Therefore, even if the SNR degradation is small in the propagation path, if the SNR degradation is large inside the receiver 1, the latter SNR power of the deteriorated level will result in the highest SNR that can be received by the receiver 1. I will. If the receivable SNR is low, the transmission rate by the adaptive modulation scheme will necessarily decrease.
- Patent Document 1 Japanese Patent Application Laid-Open No. H10-247900
- the degradation of the SNR caused by the noise of the carrier signal increases the drive current flowing through the carrier signal generator 12c, increases the output level of the carrier signal, and relatively reduces the noise with respect to the carrier signal. It is thought that this can be suppressed.
- the drive current flowing through the carrier signal generation unit 12c is specifically a channel for generating a carrier signal. This is the drive current that flows through circuits such as dipumps and voltage controlled oscillators (VCOs).
- VCOs voltage controlled oscillators
- the degradation of the SNR due to the latter filtering process can be suppressed by expanding the pass frequency band and suppressing the gain deviation and the phase deviation in the filter processing unit 12b. If the pass frequency band of the filter processing unit 12b is widened while reducing the interference power, the problem arises when the ability of the filter processing unit 12b to suppress interference waves decreases.
- An object of the present invention is to provide a receiving apparatus and a receiving method capable of improving reception quality and realizing low power consumption.
- a receiving apparatus of the present invention controls reception processing means for performing reception processing on a received signal, and controls the level of reception characteristics of the reception processing means according to the level of reception quality of the received signal.
- a configuration including reception processing control means is adopted.
- the step of measuring the reception quality of the received signal the step of determining the level of the measured reception quality based on a threshold for determining the level of the reception quality; When it is determined that the reception quality is high, control is performed to increase the reception characteristics of the reception signal, and the reception quality is low! Performing a control for lowering the reception characteristic of the received signal when it is determined to be ⁇ .
- reception quality can be improved and low power consumption can be realized. Further, according to the present invention, it is possible to improve the reception quality and improve the ability to suppress an interfering wave.
- FIG. 1 is a block diagram showing a configuration of a conventional receiving apparatus and transmitting apparatus
- FIG. 2 is a block diagram showing a configuration of a reception processing unit of the reception device shown in FIG. 1.
- FIG. 3 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 1 of the present invention.
- FIG. 4 is a block diagram showing a configuration of a reception processing unit of the reception device shown in FIG.
- FIG. 5 is a block diagram showing a configuration of a reception processing control unit of the reception device shown in FIG.
- FIG. 6 is a flowchart illustrating a receiving method of the receiving apparatus shown in FIG. 3
- FIG. 7 is a block diagram showing a configuration of a reception processing unit and a reception processing control unit of the receiving apparatus according to Embodiment 2 of the present invention.
- receiving apparatus 100 has a receiving processing section (reception processing means) 102 for performing a receiving process on a received signal, And a reception processing control unit (reception processing control means) 104 for controlling the level of the reception characteristic of the reception processing unit 102. Further, receiving apparatus 100 receives antenna signal and transmits the received signal (received wireless signal) to reception processing section 102, and reception processing section 102 performs reception processing on the received signal and generates the reception signal. And a reception baseband signal processing unit 103 for inputting the received baseband signal from the reception processing unit 102.
- Reception processing section 102 performs predetermined reception processing including at least frequency conversion, filter processing, analog-to-digital conversion, and automatic gain control on a reception signal transmitted from antenna 101, and performs a predetermined level of reception base. Output band signal. As shown in FIG. 4, reception processing section 102 multiplies a carrier signal generation section 102a that outputs a carrier signal, a reception signal transmitted from antenna 101 and a carrier signal output from carrier signal generation section 102a. A multiplication processing unit 102b for generating a reception baseband signal. Although a detailed circuit configuration is omitted, the carrier signal generation unit 102a is configured to include a charge pump, a voltage controlled oscillator (VCO), and the like. [0021] Reception baseband signal processing section 103 receives the reception baseband signal output from reception processing section 102, performs predetermined baseband signal processing on the reception baseband signal, and generates a demodulated signal. I do.
- Reception processing control section 104 measures the level of the reception quality of the demodulated signal (demodulated reception signal) output from reception baseband signal processing section 103, and responds to the level of the measured reception quality. Then, a reception processing control signal is output to the carrier signal generation section 102a of the reception processing section 102. As shown in FIG. 5, the reception processing control unit 104 includes a high reception quality mode power supply unit 104d that supplies a large amount of drive current to the carrier signal generation unit 102a, and a small!
- a low power consumption mode power supply section 104e for supplying normal driving current
- a power reception switching section 104c for switching between a high reception quality mode power supply section 104d and a low power consumption mode power supply section 104e, and a reception quality of a reception signal.
- a reception quality measurement unit 104a to measure and a reception quality measurement result power and a reception quality judgment based on a threshold for determining the reception quality level, and the judgment result power also controls the switching of the power supply switching unit 104c. 104b.
- the reception processing control signal is a drive current supplied from the high reception quality mode power supply unit 104d or the low power consumption mode power supply unit 104e.
- the driving current is supplied from a battery or a battery.
- the reception processing control signal can adjust the output level of the carrier signal output from the carrier signal generator 102a, and can change the relative noise amount of the carrier signal. Since the carrier signal generates a reception baseband signal in the multiplication processing unit 102b, the reception processing control signal controls the reception characteristics of the reception processing unit 102 as a result.
- receiving apparatus 100 when the reception quality of the received signal transmitted from antenna 101 is high, a large amount of drive current is supplied to carrier signal generating section 102a to generate the carrier signal. The output level can be increased, and the noise amount of the carrier signal can be relatively reduced. Therefore, the reception processing unit 102 can perform reception processing on reception signals with high reception quality with high reception characteristics. Further, in receiving apparatus 100, when the reception quality of the received signal is low, for example, when the reception quality is normal, the drive current flowing through carrier signal generation section 102a can be reduced. Therefore, power consumption Since power consumption can be reduced, low power consumption can be realized.
- Embodiment 1 a receiving method of receiving apparatus 100 according to Embodiment 1, and in particular, a controlling method of controlling receiving characteristics of receiving processing section 102 by receiving processing control section 104 in accordance with the received quality of a received signal are described in FIG. This will be briefly described with reference to FIGS. 3 to 5 described above.
- a reception signal finally demodulated through each of the antenna 101, the reception processing unit 102, and the reception baseband signal processing unit 103 is input to the reception quality measurement unit 104a of the reception processing control unit 104.
- the reception quality measuring section 104a measures the reception quality of the received signal as shown in step S1.
- the threshold determination unit 104b determines whether the measured value of the received quality is higher than the threshold or lower than the threshold based on the threshold for determining the level of the reception quality. Is determined. For example, if the SNR of the received signal is low and the SNR of the carrier signal can measure only up to 25 dB in the normal reception quality, the threshold for determining the level of the reception quality is set to 20 dB.
- threshold measurement section 104b determines that the measured value of the reception quality is higher than the threshold, a mode switching signal is output to power supply switching section 104c based on the determination result.
- the power supply switching unit 104c selects the high reception quality mode power supply unit 104d based on the mode switching signal, and the reception processing control signal is output from the high reception quality mode power supply unit 104d to the carrier signal generation unit 102a. That is, the high reception quality mode power supply section 104d supplies a large amount of drive current to the carrier signal generation section 102a.
- step S3 the output level of the carrier signal is increased in the carrier signal generator 102a, and the relative noise amount of the carrier signal can be reduced. It is possible to perform reception signal reception processing with high signal reception quality and high reception characteristics.
- threshold value determination section 104b determines that the measured value of the reception quality is lower than the threshold value, it outputs a mode switching signal to power supply switching section 104c based on the determination result.
- the power supply switching unit 104c selects the low power consumption mode power supply unit 104e based on the mode switching signal, and the reception processing control signal is output from the low power consumption mode power supply unit 104e to the carrier signal generation unit 102a. That is, the low power consumption mode power supply unit 104e supplies a small drive current to the carrier signal generation unit 102a.
- step S4 the carrier signal generator 10 In 2a, power consumption can be reduced, and power consumption can be reduced.
- the reception characteristic when the reception quality of a received signal is high, the reception characteristic can be enhanced by giving priority to the high reception quality, and when the reception quality is low, the power consumption can be reduced.
- the power can be reduced.
- the carrier signal generation unit by controlling the level of the output level of the carrier signal according to the level of the reception quality of the received signal, the carrier signal generation unit is controlled when the reception quality of the received signal is high.
- a large amount of drive current can flow through 102a to increase the output level of the carrier signal, reduce the relative amount of noise in the carrier signal, and drive the carrier signal to 102a when the reception quality is low. The current can be reduced.
- the reception quality of the received signal is high, and if the reception quality is high, the reception quality can be prioritized and the reception characteristics can be improved, and as a result, the internal noise of the reception apparatus 100, which is one of the main factors that degrade the SNR, is reduced.
- the maximum SNR that can be received by the receiving apparatus 100 can be increased. Therefore, in receiving apparatus 100, the transmission rate by the adaptive modulation scheme can be increased.
- receiving apparatus 100 includes reception processing section 102 that performs reception processing on a received signal, and reception processing that controls the level of reception characteristics of reception processing section 102 according to the level of reception quality of the received signal. And a control unit 104 (see FIG. 3).
- reception processing section 102 includes, as shown in FIG. 7, a filter processing section 102c that performs a filtering process on a reception baseband signal output from multiplication processing section 102b.
- the filtering process includes a process of attenuating an interference wave of the received baseband signal.
- Reception processing control section 104 outputs a reception processing control signal to filter processing section 102c according to the level of the reception quality of the received signal, and adjusts a pass frequency band (cutoff frequency) of filter processing section 102c. , And controls the level of the SNR of the received baseband signal after the filter processing output from the filter processing unit 102c. As shown in FIG. 7, the reception processing control unit 104 switches the pass frequency band of the reception baseband signal in the filter processing unit 102c.
- Reception frequency measurement section 104a that measures the reception quality of a reception signal, similar to reception processing control section 104 of reception apparatus 100 according to Embodiment 1, and determines the level of reception quality. The measurement result power of the reception quality is determined on the basis of the threshold value to be determined, and the determination result power is provided with a threshold value determination unit 104b that controls the switching of the pass frequency band switching unit 104f.
- the reception processing control signal is a signal for controlling a pass frequency band of the filter processing unit 102c. That is, when the reception quality of the received signal is high, the pass frequency band switching unit 104f of the reception process control unit 104 outputs a reception process control signal that widens the pass frequency band of the filter processing unit 102c to reduce the interference wave attenuation characteristic.
- the desired signal is efficiently extracted at the expense of the signal, and control is performed so that the received baseband signal can be output from the filter processing unit 102c while the SNR is high.
- the reception quality of the received signal is high, the level of the interfering signal becomes relatively large when the level of the desired signal of the received signal is large. The effect of deterioration is extremely small.
- the pass frequency band switching unit 104f of the reception processing control unit 104 is connected to the pass frequency band of the filter processing unit 102c. Outputs a reception processing control signal that narrows the band, enhances the interference wave attenuation characteristics, and performs control that satisfies the standard for interference attenuation of the received baseband signal. Further, by performing control for narrowing the pass frequency band, power consumption in the filter processing unit 102c can be reduced, so that power consumption can be reduced.
- the filter processing section 102c is configured to include a single capacitor, and the pass frequency band can be adjusted by controlling the applied voltage. Further, according to the present invention, the filter processing unit 102c is constructed by a plurality of filters each having a different pass frequency band, and any one of the filters is selected by the reception processing control signal output from the pass frequency band switching unit 104f. You may try to adjust the pass frequency band in such a way.
- reception characteristic of reception processing section 102 (here, filter processing section 102c) is controlled in accordance with the basic reception method of reception apparatus 100 according to Embodiment 2, in particular, the reception quality of the received signal.
- the control method controlled by section 104 is the same as that of receiving apparatus 1 according to Embodiment 1 described above. Since the receiving method is basically the same as the receiving method of 00, the description here is omitted.
- Embodiment 2 when the reception quality of the received signal is high, the SNR of the received baseband signal output from filter processing section 102c can be increased, and the When the reception quality is low, the pass frequency band of the filter processing unit 102c can be narrowed, and the function of suppressing interference waves can be enhanced.
- the present invention is not limited to the above embodiment.
- a receiving apparatus 100 that controls the reception characteristic of the reception processing unit 102 to two levels, high and low, with respect to two levels of the reception quality of the received signal.
- the present invention may be applied to a receiving apparatus 100 that controls the reception characteristics of the reception processing unit 102 to three or more levels with respect to three or more levels of reception quality of a received signal.
- a plurality of thresholds for determining the level of the reception quality of the received signal are set in threshold determination section 104b of reception processing control section 104.
- the present invention may be applied to a receiving apparatus 100 that linearly controls the reception characteristic of the reception processing unit 102 with respect to the reception quality that changes linearly of a received signal. Further, the present invention may be applied to a receiving apparatus 100 that controls the receiving characteristics of the receiving processing unit 102 stepwise with respect to the receiving quality of a received signal that changes linearly.
- the present invention provides a method for controlling the mode switching signal output from the threshold determination unit 104b of the reception processing control unit 104, in order to prevent frequent switching of the mode switching signal.
- the thresholds of the types are set on the hysteresis curve, and the operations of the first low power consumption mode, the first high reception quality mode, the second high reception quality mode, and the second low power consumption mode are continuously performed.
- the output of the mode switching signal may be controlled so as to be performed.
- the present invention may be configured as a receiving device in which receiving device 100 according to Embodiment 1 and receiving device 100 according to Embodiment 2 are combined. That is, according to the present invention, as shown in FIG. 7 described above, the reception processing unit 102 of the receiving apparatus 100 is constructed by the multiplication processing unit 102b, the carrier signal generation unit 102a, and the filter processing unit 102c, and the carrier signal generation unit 102a The output level of the carrier signal and the pass frequency band of the filter processing unit 102c may be appropriately controlled by the reception processing control unit 104.
- the receiving apparatus and the receiving method according to the present invention have the effect of improving the reception quality and realizing low power consumption, and are effective for mobile objects such as mobile phones and mobile terminal devices for wireless LAN.
- the present invention is useful for all devices that perform wireless communication, such as a communication terminal device, a base station device that performs wireless communication with the mobile communication terminal device, and an intermediate base station device installed at an access point.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004011590A JP2005210171A (ja) | 2004-01-20 | 2004-01-20 | 受信装置及び受信方法 |
JP2004-011590 | 2004-01-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005069496A1 true WO2005069496A1 (ja) | 2005-07-28 |
Family
ID=34792340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/000486 WO2005069496A1 (ja) | 2004-01-20 | 2005-01-17 | 受信装置及び受信方法 |
Country Status (2)
Country | Link |
---|---|
JP (1) | JP2005210171A (ja) |
WO (1) | WO2005069496A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101314358B1 (ko) * | 2005-03-24 | 2013-10-04 | 톰슨 라이센싱 | 다중 신호 대 잡음비 측정 소스를 이용한 비선형 신호 왜곡검출 |
US9307549B2 (en) * | 2013-09-30 | 2016-04-05 | Qualcomm Incorporated | Dynamic SNR adjustment in a receiver supporting 256QAM |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10173551A (ja) * | 1996-12-13 | 1998-06-26 | Nec Corp | フィルタ切替え装置 |
JP2000022575A (ja) * | 1998-07-01 | 2000-01-21 | Nec Corp | 受信機及びプログラムを記憶した記憶媒体 |
JP2003243921A (ja) * | 2002-02-15 | 2003-08-29 | Ntt Docomo Inc | アンテナの指向角を制御する無線受信装置および方法 |
-
2004
- 2004-01-20 JP JP2004011590A patent/JP2005210171A/ja not_active Ceased
-
2005
- 2005-01-17 WO PCT/JP2005/000486 patent/WO2005069496A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10173551A (ja) * | 1996-12-13 | 1998-06-26 | Nec Corp | フィルタ切替え装置 |
JP2000022575A (ja) * | 1998-07-01 | 2000-01-21 | Nec Corp | 受信機及びプログラムを記憶した記憶媒体 |
JP2003243921A (ja) * | 2002-02-15 | 2003-08-29 | Ntt Docomo Inc | アンテナの指向角を制御する無線受信装置および方法 |
Also Published As
Publication number | Publication date |
---|---|
JP2005210171A (ja) | 2005-08-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4290212B2 (ja) | 移動局の通信状態におけるアンテナ調整システムおよび方法 | |
EP1623515B1 (en) | Multiple antenna receiver | |
US7529528B2 (en) | Power consumption controlling apparatus for high frequency amplifier | |
US6324387B1 (en) | LNA control-circuit for receive closed loop automatic gain control | |
US6801760B2 (en) | Control of receiver immunity to interference by controlling linearity | |
JP3014765B2 (ja) | 通信リンク品質指示を与えるための方法および装置 | |
US6614806B1 (en) | Method and apparatus for interfering receiver signal overload protection | |
JP3415431B2 (ja) | 無線送受信機とその受信高周波ユニット及び制御ユニット | |
US20030190924A1 (en) | Method and apparatus for determining receive diversity in mobile station | |
US8081685B2 (en) | Communication control apparatus, communication terminal apparatus, wireless communication system, and transmitting method | |
WO1999039457A1 (en) | Apparatus and method for selecting between a plurality of antennas utilized by a microcellular communications terminal for reception of a signal | |
RU2422995C2 (ru) | Снижение тока потребления в цепях с rx разнесением | |
JPH0946290A (ja) | 移動無線機 | |
WO1999052229A1 (fr) | Appareil pour station de base radio, et procede de radiocommunications | |
KR20040037205A (ko) | 원격 유닛에서의 공간 프로세싱 제공 방법 및 장치 | |
US20070087770A1 (en) | Methods and apparatuses for transmission power control in a wireless communication system | |
JP2008011329A (ja) | 携帯通信機およびアンテナ制御方法 | |
WO2005069496A1 (ja) | 受信装置及び受信方法 | |
KR100853372B1 (ko) | 이동통신 단말 및 수신 다이버시티 절단방법 | |
JP2005229539A (ja) | 移動通信端末装置 | |
JPH0865233A (ja) | 携帯電話機 | |
JP2008252312A (ja) | 送信電力制御方法および無線通信装置 | |
JP2004064525A (ja) | フィードバック利得制御回路及び無線通信装置 | |
JP2012165164A (ja) | 無線装置およびノイズ処理方法 | |
JP2004128863A (ja) | 無線通信装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): BW GH GM KE LS MW MZ NA SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LT LU MC NL PL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWW | Wipo information: withdrawn in national office |
Country of ref document: DE |
|
122 | Ep: pct application non-entry in european phase |