CN101465662B - Method and device for implementing WLAN fall-down frequency usage - Google Patents
Method and device for implementing WLAN fall-down frequency usage Download PDFInfo
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- CN101465662B CN101465662B CN200710303739XA CN200710303739A CN101465662B CN 101465662 B CN101465662 B CN 101465662B CN 200710303739X A CN200710303739X A CN 200710303739XA CN 200710303739 A CN200710303739 A CN 200710303739A CN 101465662 B CN101465662 B CN 101465662B
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Abstract
The invention provides a method and a device for realizing WLAN frequency reduction application, which comprise a receiver pathway and a transmitter pathway. The work frequency range of 802.11g WLAN is 2.4Ghz, and the receiving and transmitting are time-division duplex (TDD). The media access control (MAC) and a base band processor (BBP) are integrated in a chip to finish protocol processing and digital modulation and demodulation; the RF part adopts an integrated 2.4Ghz RF transceiver to finish simulation modulation and demodulation and frequency transformation. The base band processor (BBP) finishes automatic gain control (AGC) function. The frequency reduction device comprises a MAC/BBP chip, 2.4GHz RF transceiver chip and a frequency conversion part. When the frequency reduction device is in use, the inherent AGC algorithm in BBP chip is not changed, and the 2.4Ghz RF transceiver chip and frequency-conversion gain distribution are designed to adapt to AGC algorithm. The receiver pathway and transmitter pathway comprise a MAC/BBP chip, a 2.4Ghz RF transceiver chip, a frequency mixer, a switching matrix, an adjustable gain module, a transmit-receive switch and an antenna; wherein, the adjustable gain module is composed of a low-noise amplifier, an adjustable attenuator and a power amplification drive; the adjustable gain module is shared by receiver pathway and the transmitter pathway through the switchover of the switching matrix.
Description
Technical field
The present invention relates to a kind of method and apparatus that improves receiving sensitivity in wireless communication field, relate to and reduce the WLAN centre frequency, the design radio-frequency (RF) front-end circuit is to adapt to existing automatic gain control (AGC) in baseband processor (BBP) integrated circuit, improve receiver sensitivity, realize WLAN frequency reducing communication function.
Background technology
WLAN is operated in the 2.4Ghz frequency range, because the diffracting power of high-frequency signal is not strong, has fettered the application of WLAN.For supporting some special applications, need to reduce the WLAN centre frequency.Because the automatic gain of receiver control (AGC) circuit is realized in the Base-Band Processing integrated circuit, when frequency reducing is used, can not change intrinsic algorithm in the integrated circuit, need the redesign radio circuit to adapt to intrinsic AGC algorithm.
In existing 2.4Ghz radio-frequency front-end receiving circuit, signal from antenna by transmit-receive switch and receiving filter to integrated rf chip (Transceiver).This radio frequency chip is integrated low noise amplifier, demodulator and variable gain amplifier (VGA).The output analog baseband signal is to baseband processing chip (BBP).Radiofrequency signal for varying strength, automatic gain control (AGC) in the baseband processing chip is by measuring the analog baseband signal energy of radio frequency chip output, adjust the multiplication factor of low noise amplifier in the rf chip (Transceiver) and the multiplication factor of variable gain amplifier (VGA), realize certain receiver sensitivity and dynamic range.
In existing 2.4Ghz radio-frequency front-end radiating circuit, baseband processor (BBP) output baseband signal is in integrated radio frequency chip (Transceiver), and this radio frequency chip is integrated, and variable gain amplifier (VGA) and frequency mixer and power amplifier drive.The output radiofrequency signal arrives antenna then to transmit-receive switch.
Because requirement and hardware cost that frequency reducing is used, the restriction of implementation complexity aspect needs to use a kind of technology frequency reducing to realize the WLAN transmission-receiving function, improves receiver sensitivity simultaneously.
Summary of the invention
The invention provides the method and apparatus that a kind of WLAN of realization frequency reducing is used, in the hope of reaching with less hardware cost and complexity, frequency reducing realizes the WLAN transmission-receiving function, improves receiver sensitivity.For this reason, the invention discloses the existing media interviews control of a kind of utilization (MAC), baseband processor (BBP) chip and 2.4Ghz frequency range rf chip (Transceiver), and frequency mixer, filter, low noise amplifier, adjustable attenuator, power amplifier drive, switch matrix is realized this goal.Wherein: low noise amplifier, adjustable attenuator and power amplifier drive the adjustable gain module of forming and are reception path and emission path sharing.Concrete structure is seen Fig. 1.This device uses 2.4Ghz rf chip (Transceiver), receives path and launch path sharing low noise amplifier, adjustable attenuator and power amplifier to drive the adjustable gain module of forming.
In the emission path, computer send MAC and BBP processor upper layer data, and the output analog baseband signal arrives frequency mixer by 2.4Ghz rf chip (Transceiver) up-conversion output 2.4GHz radiofrequency signal by transmit-receive switch, filter; Frequency mixer is exported the signal of the target frequency of selecting by filter, this signal enters a mouth of switch matrix, output to the adjustable gain module that low noise amplifier, adjustable attenuator and power amplifier drive composition from the b mouth of switch matrix, the adjustable gain module output signal is sent into the c mouth of switch matrix, output to power amplifier (PA) from the d mouth, send to antenna by switch, finish the emission path.
Receive in the path, antenna receiving target signal reaches the e mouth of switch matrix by receiving filter and switch, output to low noise amplifier from the b mouth of switch matrix, adjustable attenuator and power amplifier drive the adjustable gain module of forming, the adjustable gain module output signal is sent into the c mouth of switch matrix, from a mouth output signal by filter to frequency mixer, upconvert to 2.4Ghz, this signal arrives 2.4Ghz rf chip (Transceiver) by transmit-receive switch, demodulation obtains analog baseband signal, pass through MAC, BBP chip solution reconciliation protocol is handled the back data and is sent computer, finishes the reception path.
In the emission path, the part that transmitting power is adjustable comprises 2.4Ghz rf chip (Transceiver) and the adjustable gain module of being made up of low noise amplifier, adjustable attenuator and power amplifier driving.For simplified design keeps the transmitting power dynamic range simultaneously, when emission, adjustable gain module and power amplifier (PA) provide fixed gain, and the dynamic range of 2.4Ghz rf chip (Transceiver) output is constant.
In receiving path, receive automatic gain controlling (AGC) control and comprise LNA, VGA in the 2.4Ghz rf chip (Transceiver) and the gain of variable gain module.The present invention proposes the fixedly gain of the middle LNA of 2.4G rf chip (Transceiver), the yield value of high two control adjustable gain modules of AGC algorithm output, still control VGA in the 2.4G rf chip (Transceiver) for low 5 of the output of AGC algorithm, as shown in Figure 2, by the gain and the fixed attenuation value of design variable gain module, improve receiving sensitivity.Referring to embodiment.
Feature of the present invention comprises:
(1) the WLAN lowering freqyency device uses existing MAC/BBP chip, 2.4Ghz rf chip (Transceiver), and discrete components and parts are realized transmission-receiving function.
(2) receiving path, by the fixedly middle low noise amplifier gain of 2.4Ghz radio frequency chip (Transceiver), the gain and the fixed attenuation value of design variable gain module improve receiving sensitivity;
(3) at the emission path, 2.4Ghz radio frequency chip (Transceiver) out-put dynamic range is constant, drives adjustable gain module and the power amplifier (PA) formed by low noise amplifier, adjustable attenuator and power amplifier fixed gain is provided.
(4) receive path and emission path by the shared adjustable gain module of forming that drives by low noise amplifier, adjustable attenuator and power amplifier of switch matrix.
Description of drawings
Fig. 1 is a kind of electrical block diagram of realizing that IEEE 802.11g WLAN frequency reducing is used;
Fig. 2 is for receiving the path circuitry structural representation;
Fig. 3 is that the receiving gain of WLAN 11mbps signal distributes the analytical parameters table;
Embodiment
Below in conjunction with accompanying drawing, specify the present invention.
The invention discloses the method and apparatus that a kind of IEEE of realization 802.11g WLAN frequency reducing is used.Comprising emission path and reception path.
Receive path such as Fig. 2, Fig. 2 couples together the circuit of reception path on Fig. 1 basis.2.4Ghz gain, adjustable gain module and the fixed attenuation of LNA and VGA determine the sensitivity that receives jointly in the rf chip (Transceiver).In receiving path, radiofrequency signal for varying strength, automatic gain control (AGC) circuit in the baseband processing chip (BBP) is by measuring the analog baseband signal energy of radio frequency chip output, adjust the gain of adjustable gain module and the multiplication factor of the middle variable gain amplifier (VGA) of 2.4Ghz rf chip (Transceiver), improve receiver sensitivity and dynamic range.The gain of wherein controlling the adjustable gain module is B[6:5] two bits, realize 3 grades of gains; Control variable gain amplifier (VGA) be B[4:0] totally 5 bits; 2.4Ghz LNA connects fixed gain in the rf chip (Transceiver); Concrete parameter is referring to Fig. 3, and this figure is that the receiving gain of WLAN 11mbps signal distributes analysis.
Wherein, system's receptivity P=P
2.4G-G-A.(1)
Expression system receptivity (dBm) in the formula (1), G represents adjustable gain module gain (dB), A represents fixed attenuation (dB), P2.4G: expression 2.4G Transceiver receives dynamic range (dBm).
At LNA[1:0]=during 2 ' b11, the range of receiving of 2.4Ghz Transceiver is [83 ,-30] dBm, and this scope is fixedly LNA gain among the 2.4Ghz Transceiver, and the AGC algorithm is adjusted the range of receiving that VGA realizes among the 2.4Ghz Transceiver.3 grades of gains that realize (20,5 ,-10) dB respectively of adjustable gain module, other partial fixings decay to-10dB in the circuit, can obtain system's receptivity thus and be [93 ,-10] dBm.
In the emission path, 2.4Ghz Transceiver output energy range is [25,5] dBm, and the gain of adjustable gain module is 25dB, and the power amplifier gain is 15dB, and other decay to 10dB in the path, and finally obtaining system's output power range is [5,35] dBm.
The present invention has the following advantages:
(1) do not need to change existing chip AGC algorithm, improve receiving sensitivity, realize the WLAN transmission-receiving function.
(2) by use 2.4Ghz rf chip (Transceiver), and the transmit-receive sharing partial circuit, installation cost reduced.
More than disclosed be a specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those skilled in the art can think variation all should drop in protection scope of the present invention.
Claims (3)
1. device of realizing that the WLAN frequency reducing is used, it is characterized in that comprising receiving path and emission path, wherein receive path and form by parts, frequency mixer, filter, switch matrix, adjustable gain module, transmit-receive switch and the antenna of MAC/BBP chip, 2.4Ghz rf chip, integrated transmit-receive switch and filter; The emission path is made up of parts, frequency mixer, filter, switch matrix, adjustable gain module, power amplifier, transmit-receive switch and the antenna of MAC/BBP chip, 2.4Ghz rf chip, integrated transmit-receive switch and filter; When frequency reducing is used, in receiving path, do not change existing AGC algorithm in the MAC/BBP chip, by low noise amplifier gain in the fixing 2.4Ghz rf chip, the gain and the fixed attenuation value of design adjustable gain module, raising receiving sensitivity; Do not change existing AGC algorithm in the MAC/BBP chip in the emission path, 2.4Ghz rf chip out-put dynamic range is constant, provides fixed gain by adjustable gain module and power amplifier, and wherein MAC is that MAC controller, BBP are baseband processor; In the emission path, signal enters a mouth of switch matrix, outputs to low noise amplifier, adjustable attenuator and power amplifier from the b mouth of switch matrix and drives the adjustable gain module of forming, and the adjustable gain module output signal is sent into the c mouth of switch matrix, output to power amplifier from the d mouth, send to antenna by switch; Receive in the path, signal reaches the e mouth of switch matrix by receiving filter and switch, output to the adjustable gain module that low noise amplifier, adjustable attenuator and power amplifier drive composition from the b mouth of switch matrix, the adjustable gain module output signal is sent into the c mouth of switch matrix, from a mouth output signal by filter to frequency mixer.
2. a kind of device of realizing that the WLAN frequency reducing is used as claimed in claim 1 is characterized in that described adjustable gain module is driven by low noise amplifier, adjustable attenuator and power amplifier to form.
3. a kind of device of realizing that the WLAN frequency reducing is used as claimed in claim 1 is characterized in that, receives path and emission path by the shared adjustable gain module of switch matrix.
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| CN200710303739XA CN101465662B (en) | 2007-12-21 | 2007-12-21 | Method and device for implementing WLAN fall-down frequency usage |
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| CN200710303739XA CN101465662B (en) | 2007-12-21 | 2007-12-21 | Method and device for implementing WLAN fall-down frequency usage |
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| CN101465662B true CN101465662B (en) | 2013-07-24 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102740504A (en) * | 2011-04-01 | 2012-10-17 | 苏州英诺迅科技有限公司 | WiFi communication system and method |
| CN104469991B (en) * | 2014-11-21 | 2018-01-16 | 北京佰才邦技术有限公司 | The method and device of wireless telecommunications |
| CN106817177A (en) * | 2015-11-30 | 2017-06-09 | 华大半导体有限公司 | A kind of inexpensive sensibility testing arrangement |
| CN108736909A (en) * | 2018-05-09 | 2018-11-02 | 深圳市盛路物联通讯技术有限公司 | The radio circuit and terminal of SAW filter combination anti aliasing purposes filter |
| WO2023070631A1 (en) * | 2021-10-30 | 2023-05-04 | 上海华为技术有限公司 | Communication chip, communication module, communication system and base station |
| CN114745019B (en) * | 2022-03-29 | 2024-04-09 | 福建星海通信科技有限公司 | Communication system based on WiFi frequency conversion |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409507A (en) * | 2001-09-28 | 2003-04-09 | 株式会社日立制作所 | Radio communication receiver |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1409507A (en) * | 2001-09-28 | 2003-04-09 | 株式会社日立制作所 | Radio communication receiver |
Non-Patent Citations (2)
| Title |
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| Chi Baoyong等.A 2.4GHz CMOS Monolithic Transceiver Front-End for IEEE 80211.b Wireless LAN Applications.《半导体学报》.2005,第26卷(第9期), * |
| 全会阁等.2.4G直接下变频接收机射频前端的设计与研究.《微计算机信息》.2006,第22卷(第12-2期), * |
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Address after: 102209 Beijing, Beiqijia, the future of science and technology in the south area of China electronic network security and information technology industry base C building, Patentee after: Beijing CEC Huada Electronic Design Co., Ltd. Address before: 100102 Beijing City, Chaoyang District Lize two Road No. 2, Wangjing science and Technology Park A block five layer Patentee before: Beijing CEC Huada Electronic Design Co., Ltd. |