CN1514554A - Diversity device used on TDD mobile communication system - Google Patents
Diversity device used on TDD mobile communication system Download PDFInfo
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- CN1514554A CN1514554A CNA021605459A CN02160545A CN1514554A CN 1514554 A CN1514554 A CN 1514554A CN A021605459 A CNA021605459 A CN A021605459A CN 02160545 A CN02160545 A CN 02160545A CN 1514554 A CN1514554 A CN 1514554A
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Abstract
The diversity unit consists of antenna unit containing two routes of antenna channels, signal selector including antenna selection switch and switch for selecting receiving and transmitting, transceiver unit including a receiver and a transmitter, and signal selection/control interface including RSSI module for testing intensity of received signal. One route of receiver and transmitter, and antenna in multipath reception and transmission are utilized in the device. Using switch in radio frequency for switching selections among multiple channels of antenna provides control interface, and strobing one route of antenna as receiving and transmitting channel. Same channel is adopted for receiving and transmitting signal in order to keep balance of chain. In TDD mode, receiving signal and transmitting signal are positioned at different time slots. Switch in radio frequency makes receiving signal and transmitting signal possible to use same antenna channel, and balance the chain.
Description
Technical field
The present invention relates to the diversity apparatus in the wireless communication field, relate in particular to the diversity apparatus of a kind of TDD of being used for (time division duplex) mobile communication system.
Background technology
In wireless communication field, need between travelling carriage and base station, set up wireless channel, the quality of wireless channel is most important for the whole communication system performance.The propagation path of wireless channel is very complicated, from simple line-of-sight propagation, to running into various obstacles, reflects as building, leaf, people, vehicle or the like, diffraction and scattering.Like this, from transmitted from transmitter to receiver, the path that the electromagnetic wave experience is different superposes on receiver antenna at last, and the intensity of signal is just relevant with phase place, the amplitude of each component, forms multipath effect.These multipath ripples are because the difference of intensity, propagation time and the bandwidth that transmits etc., and make the amplitude and the phase place of the received signal after synthetic, even waveform might alter a great deal, and cause distortion and fade-out.Move if receiver is done a little on ground, also can cause composite signal that big variation is arranged.
Because the influence of multipath effect, travelling carriage are in moving process, moving among a small circle also can cause fluctuating widely of wireless signal.Usually in design, adopt the rake reception technique, to improve quality of wireless channel.
Existing diversity apparatus mainly contains following several:
One, adopts multipath reception, and generate the comprehensive output of multipath reception.This applicant is retrieved many pieces of Chinese patent literatures, for example:
Patent 99123429 adopts multichannel antenna and a plurality of receiver module, and combiner receives the output of each receiver module, generates a comprehensive output.
Patent 99801007 described devices estimate to receive weight coefficient by the signal that a plurality of antennas receive, and form target side tropism figure according to this reception weight coefficient that estimates.
Patent 00134867 adopts a plurality of antennas, is used to make described a plurality of sector that antenna diversity is carried out in each described sector and receives, and receiving-member is used to handle the received signal that described a plurality of antenna receives; A plurality of receiving elements are provided with the described receiving-member of many groups.
Patent 99119010 adopts the diversity branch circuit, the amplitude normalization of the signal that provides from associated antenna is provided each described diversity branch circuit, determine and a deviation angle that reference angle is relative from this normalized signal, produce the vector component of a pair of inphase quadrature and the angle weighting coefficient that is inversely proportional to and changes with described deviation angle, and by this angle weighting coefficient to vector weighting.
Patent 99111588 has adopted multipath receiver to receive the signal of communication that sends from transmitter.
Patent 99117043 described diversity apparatus have adopted master, two identical branch roads of diversity, and every branch road comprises radio frequency part and intermediate-frequency section.
Patent 99800096 described diversity techniques have adopted adaptive array antenna, adopt a plurality of diversity reception circuit, and described a plurality of diversity reception circuit have the parameter value of different definite communication environment tracking characteristics, and can upgrade described parameter value; The signal that receives from a plurality of antenna elements that constitute described array antenna is input to described a plurality of diversity reception circuit; Operate each of described diversity reception circuit, so that adapt to communication environment, the output received signal; And each the quality of reception of determining the output of described a plurality of diversity reception circuit, and select in the output of described a plurality of diversity reception circuit one according to this result who determines as received signal.
Patent 98102660, described diversity system comprises first and second receiving-members of first and second antennas, the signal that is respectively received produces first and second reception electric field intensity signals and first and second phase signals, and produces first and second vector signals with these signals respectively through the first and second vector signal production parts.
Patent 99805653: adopt two-way to receive branch.
Patent 98102864: diversity system has adopted a plurality of demodulators, is provided with corresponding to a plurality of antennas, and the orthogonal frequency division multiplex signal that obtains being received respectively by these a few antennas carries out demodulation respectively; The output level detector according to the level of each restituted signal of exporting from a plurality of demodulator, is controlled to be identical value the gain amplifier in a plurality of demodulators is variable; The addition synthesizer carries out addition to each restituted signal of exporting from a plurality of demodulator and synthesizes.
Patent 98106035 described diversity receiving methods: each all receives this signal that sends through radiolink from Mobile end stations a plurality of base stations, carry out error correction decoding to received signal and handle, and the signal of error correction decoding is sent to base station main frame apparatus through a Wireline.Base station main frame apparatus carries out error correction coding to each signal that receives from the base station to be handled, and synthesizes a signal, and composite signal is carried out error correction decoding handle.Also be different from this device and adopt one road receiver and sender, diversity apparatus more complicated.
The diversity receiver of patent 97117872 comprises a plurality of receivers.
Two, adopt antenna switching diversity to receive: for example patent 99105479,99111796 has adopted antenna-switching device, is used for switching to another road at the multichannel antenna from one the tunnel.
There are the shortcoming that does not relate to the descending link of posting a letter simultaneously in diversity apparatus complexity, cost height in the prior art.
Summary of the invention
The present invention is the diversity apparatus that provide for the shortcoming that overcomes existing mobile communication system diversity apparatus a kind of adopts a kind of TDD of being used for mobile communication system of diversity reception that simple device realizes the base station and diversity transmission.This device adopts one road receiver and sender, and the multipath reception transmitting antenna utilizes radio-frequency (RF) switch to switch selection in the multichannel antenna channels, and control interface is provided, gating wherein No. one antenna as transceiver channel.In order to make the receiving-transmitting chain balance, the passage of posting a letter adopts and the same channel of collecting mail.At tdd mode, received signal with send signal respectively at different time slots, select radio-frequency (RF) switch to switch at receiving branch circuit and transmitting branch that realizing collects mail and post a letter adopts identical antenna channels by adopting transmitting-receiving, make the receiving-transmitting chain balance.
Technical scheme of the present invention is: the diversity apparatus of a kind of TDD of being used for (time division duplex) mobile communication system is characterized in that comprise: antenna element, signal selector, transceiver unit and signal are selected control interface;
Described antenna element comprises the two-way antenna channels;
Described signal selector comprises antenna selection switch and receiving/transmission selection switch; Antenna selection switch is used for the antenna channels gating one tunnel different on several roads, as collecting mail and the passage of posting a letter; Receiving/transmission selection switch is used between receiver and sender switching and being connected of antenna channels;
Described transceiver unit unit comprises one road receiver, riches all the way letter machine; Receiver is used to receive the signal that selection obtains through signal selecting circuit, offers baseband circuit through after the mixing, with further rectification, obtains the data that transmitting terminal (travelling carriage) sends; Sender is used for baseband modulation signal mixing, amplification that baseband circuit is provided, and the passage through the signal selector gating is connected with antenna sends by sky bundle of lines signal;
Described signal selects control interface to comprise a collection of letters signal strength signal intensity RSSI detection module, and this RSSI detection module detects the signal level of receiver after through twice mixing, offers baseband circuit, as one of basis for estimation of selecting antenna.
Above-mentioned a kind of diversity apparatus that is used for the TDD mobile communication system wherein, also comprises a band pass filter between the antenna selection switch of described signal selector and the receiving/transmission selection switch.
Because the present invention has adopted above technical measures, only adopts one road transceiver unit, it is compared with the comprehensive export technique that adopts multipath reception and generate multipath reception, installs fairly simplely.Again, collection of letters link can be selected different antennas, and the link of posting a letter can the same road of corresponding employing antenna, realizes the receiving-transmitting chain balance.
Description of drawings
Performance of the present invention, characteristics are further described by following embodiment and accompanying drawing thereof.
Fig. 1 is the structural representation of anti-multipath decline diversity apparatus of the present invention.
Fig. 2 is that the present invention uses at the embodiment of mode of operation as PCS (personal wireless communications system) system base-station of TDMA/TDD.
Fig. 3 is the structural representation of sender among Fig. 2.
Fig. 4 is the structural representation of receiver among Fig. 2.
Embodiment
See also Fig. 1.The diversity apparatus of a kind of TDD of being used for mobile communication system of the present invention comprises with the lower part: antenna element 11, signal selector 12, transceiver unit 13 and signal are selected control interface 14.
Antenna element 11 comprises the two-way antenna channels.Two antennas spatially separate a little, and when the invalidating signal that an antenna is received, another antenna may be received strong signal.
Signal selector 12 comprises antenna selection switch, receiving/transmission selection switch.Adopt antenna selection switch to be used for the antenna feeder passage gating one tunnel different, as collecting mail and the passage of posting a letter on several roads.Adopt receiving/transmission selection switch to be used between receiver and sender, switching.This signal selector provides a day line options control end, transmitting-receiving to select control end.Can control these two switches (radio-frequency (RF) switch) by baseband circuit independently switches.
Transceiver unit unit 13 comprises a receiver and a sender.Receiver comprises local vibration source, low noise amplifier, filter, frequency mixer etc., is used to receive the signal that selection obtains through signal selecting circuit, through mixing, offers baseband circuit, with further rectification, obtains the data that transmitting terminal (travelling carriage) sends.Sender comprises local vibration source, power amplifier, filter, frequency mixer etc., is used for baseband modulation signal mixing, amplification that baseband circuit is provided, and the passage through the signal selector gating sends signal.
Signal selects control interface 14 to comprise collection of letters signal strength signal intensity RSSI detection module, for baseband circuit provides collection of letters signal strength signal intensity RSSI, as one of basis for estimation of selecting antenna.
The hardware platform that utilizes this device to provide, antenna element comprises the antenna that separates a little on two spaces, when the invalidating signal that an antenna is received, another antenna may be received strong signal, adopts antenna selection switch to receive by implementation space antenna switched diversity.In addition, in tdd mode, receive, send signal at the collection of letters time slot and the time slot of posting a letter respectively.Signal selector provides the radio-frequency (RF) switch of independent control to be used for switching between the two-way antenna, switching between the receiver sender.Select same road antenna channels for base band and be used for collecting mail and posting a letter possibility is provided, use same road antenna, realize the receiving-transmitting chain balance thereby can realize posting a letter and collecting mail.
Because in the tdd mode, the travelling carriage translational speed is relatively slow, in transmitting-receiving time slot handoff procedure, is similar to and thinks that the position does not change.If selection optimum signal, receiver just can weaken the influence of signal fadeout greatly.At collection of letters time slot, baseband circuit is according to certain algorithm gating wherein a tunnel from the two-way antenna.At the time slot of posting a letter, adopt a road same antenna.Wireless signal adopts identical wireless channel in the transmitting-receiving process, realize the receiving-transmitting chain balance, improves the channel quality of down link.
Fig. 2 is the example that the present invention is applied in the PCS that mode of operation is TDMA/TDD (personal wireless communications system) system base-station.
In this example, antenna element 11 comprises antenna 111 and antenna 112, and this two antenna is the two-way antenna that certain distance is arranged on the space, and commonly used is upright whip antenna, and antenna is at a distance of about 10 λ (λ is the radio frequency operation signal wavelength).
Signal selector 12 is made of antenna selection switch 121, band pass filter 122, receiving/transmission selection switch 123, and wherein antenna selection switch 121 is integrated circuit (IC) chip, can provide at a high speed to switch on the 2GHz frequency, and enough isolations are arranged.Transmit-receive switch 123 also is an integrated circuit (IC) chip, and it switches being communicated with of sending and receiving letter machine and antenna according to circuit conditions.
Add shown in Figure 3.Sender 131 comprises Pyatyi signal amplifier AMP1, AMP2, AMP3, AMP4, AMP5; Two frequency mixer MIXER1, MIXER2 and four band pass filter BPF1, BPF2, BPF3, BPF4.Frequency mixer MIXER1 is connected the input of sender, and frequency mixer MIXER2 is connected between amplifier AMP2 and the band pass filter BPF2; Four band pass filter BPF1, BPF2, BPF3, BPF4 are connected to after amplifier AMP1, frequency mixer MIXER2, signal amplifier AMP3 and the signal amplifier AMP5.Baseband modulation signal is finished amplification, filtering, the mixing of signal at sender, generates radiofrequency signal, switches through the two-stage switch, launches from antenna.The required local vibration source no significant difference of required local vibration source of mixing and common radio frequency transceiver can constitute with RF Phase-Lock Loop.
As shown in Figure 4.Receiver 132 comprises casacade multi-amplifier AMP1, AMP2, AMP3, AMP4, AMP5, a plurality of band pass filter BPF1, BPF2, BPF3, BPF4, BPF5 and mixing MIXER1, MIXER2.Antenna receiving signal switches through switch, finishes amplification, filtering, the mixing of signal at receiver, generates the Low Medium Frequency signal, offers follow-up demodulation circuit.The required local vibration source no significant difference of required local vibration source of mixing and common radio frequency transceiver can be made of RF Phase-Lock Loop.
By evidence, adopt apparatus of the present invention, can improve quality of wireless channel, uplink and downlink data link quality is improved, and it is obvious intuitively to improve effect.And compare with other diversity reception schemes, simple in structure, the receiving-transmitting chain balance, the diversity reception effect can satisfy system requirements.
Claims (2)
1, a kind of diversity apparatus that is used for the TDD mobile communication system is characterized in that, comprising: antenna element, signal selector, transceiver unit and signal are selected control interface;
Described antenna element comprises the two-way antenna channels;
Described signal selector comprises antenna selection switch and receiving/transmission selection switch; Antenna selection switch is used for the antenna channels gating one tunnel different on several roads, as collecting mail and the passage of posting a letter; Receiving/transmission selection switch is used between receiver and sender switching and being connected of antenna channels;
Described transceiver unit unit comprises one road receiver, riches all the way letter machine; Receiver is used to receive the signal that selection obtains through signal selecting circuit, offers baseband circuit through after the mixing, with further rectification, obtains the data that transmitting terminal sends; Sender is used for baseband modulation signal mixing, amplification that baseband circuit is provided, and the passage through the signal selector gating is connected with antenna sends by sky bundle of lines signal;
Described signal selects control interface to comprise a collection of letters signal strength detection module, and this collection of letters signal strength detection module detects the signal level of receiver after through twice mixing, offers baseband circuit, as one of basis for estimation of selecting antenna.
2, a kind of diversity apparatus that is used for the TDD mobile communication system according to claim 1 is characterized in that, also comprises a band pass filter between the antenna selection switch of described signal selector and the receiving/transmission selection switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021605459A CN100426703C (en) | 2002-12-31 | 2002-12-31 | Diversity device used on TDD mobile communication system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021605459A CN100426703C (en) | 2002-12-31 | 2002-12-31 | Diversity device used on TDD mobile communication system |
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| CN1514554A true CN1514554A (en) | 2004-07-21 |
| CN100426703C CN100426703C (en) | 2008-10-15 |
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| CNB021605459A Expired - Fee Related CN100426703C (en) | 2002-12-31 | 2002-12-31 | Diversity device used on TDD mobile communication system |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100352174C (en) * | 2005-03-28 | 2007-11-28 | 武汉虹信通信技术有限责任公司 | Method for controlling RF switch inversion according to SCDMA signal strength |
| CN100352175C (en) * | 2005-03-28 | 2007-11-28 | 武汉虹信通信技术有限责任公司 | Method for controlling RF switch inversion according to SCDMA downstream synchronization code word |
| CN101208882A (en) * | 2006-04-28 | 2008-06-25 | 富士通株式会社 | Mobile machine with takeover diversity function based on W-CDMA mode and system thereof |
| CN101018376B (en) * | 2006-02-10 | 2010-09-29 | 英飞凌科技股份公司 | Transceiver arrangement and method for processing a signal |
| CN101053173B (en) * | 2004-11-02 | 2011-09-07 | 株式会社Ntt都科摩 | Base station, radio line control station, and radio communication method |
| CN102460983A (en) * | 2009-06-30 | 2012-05-16 | 丰克韦克达本多夫有限公司 | Method for connecting signal paths, and function group designed therefor |
| WO2012159517A1 (en) * | 2011-05-20 | 2012-11-29 | 中兴通讯股份有限公司 | Method and system for optimizing antenna performance |
| CN104283592A (en) * | 2014-09-25 | 2015-01-14 | 联想(北京)有限公司 | Information processing method and electronic device |
| CN107681281A (en) * | 2017-08-30 | 2018-02-09 | 努比亚技术有限公司 | A kind of multi-antenna terminal |
| CN112737605A (en) * | 2020-12-29 | 2021-04-30 | Oppo广东移动通信有限公司 | Antenna switching circuit and method and electronic equipment |
| CN112910535A (en) * | 2021-02-05 | 2021-06-04 | 陕西天基通信科技有限责任公司 | System and method for improving coverage efficiency of 5G repeater |
| CN114270712A (en) * | 2019-06-04 | 2022-04-01 | 株式会社Kmw | Time division duplex antenna device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5430769A (en) * | 1992-11-23 | 1995-07-04 | Motorola, Inc. | Method and apparatus for controlling switched antenna diversity systems |
| EP1069707A1 (en) * | 1999-07-13 | 2001-01-17 | Motorola, Inc. | Transmit diversity transmitter and receiver for radio communications systems |
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- 2002-12-31 CN CNB021605459A patent/CN100426703C/en not_active Expired - Fee Related
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101053173B (en) * | 2004-11-02 | 2011-09-07 | 株式会社Ntt都科摩 | Base station, radio line control station, and radio communication method |
| CN100352175C (en) * | 2005-03-28 | 2007-11-28 | 武汉虹信通信技术有限责任公司 | Method for controlling RF switch inversion according to SCDMA downstream synchronization code word |
| CN100352174C (en) * | 2005-03-28 | 2007-11-28 | 武汉虹信通信技术有限责任公司 | Method for controlling RF switch inversion according to SCDMA signal strength |
| CN101018376B (en) * | 2006-02-10 | 2010-09-29 | 英飞凌科技股份公司 | Transceiver arrangement and method for processing a signal |
| US8254860B2 (en) | 2006-02-10 | 2012-08-28 | Intel Mobile Communications GmbH | Transceiver arrangement and method for processing a signal |
| US8843090B2 (en) | 2006-02-10 | 2014-09-23 | Intel Mobile Communications GmbH | Transceiver arrangement and method for processing a signal |
| CN101208882B (en) * | 2006-04-28 | 2013-06-19 | 富士通株式会社 | Mobile machine with takeover diversity function based on W-CDMA mode and system thereof |
| CN101208882A (en) * | 2006-04-28 | 2008-06-25 | 富士通株式会社 | Mobile machine with takeover diversity function based on W-CDMA mode and system thereof |
| CN102460983B (en) * | 2009-06-30 | 2014-10-01 | 丰克韦克达本多夫有限公司 | Method for connecting signal paths, and function group designed therefor |
| CN102460983A (en) * | 2009-06-30 | 2012-05-16 | 丰克韦克达本多夫有限公司 | Method for connecting signal paths, and function group designed therefor |
| WO2012159517A1 (en) * | 2011-05-20 | 2012-11-29 | 中兴通讯股份有限公司 | Method and system for optimizing antenna performance |
| CN104283592A (en) * | 2014-09-25 | 2015-01-14 | 联想(北京)有限公司 | Information processing method and electronic device |
| CN104283592B (en) * | 2014-09-25 | 2017-11-03 | 联想(北京)有限公司 | Information processing method and electronic equipment |
| CN107681281A (en) * | 2017-08-30 | 2018-02-09 | 努比亚技术有限公司 | A kind of multi-antenna terminal |
| CN114270712A (en) * | 2019-06-04 | 2022-04-01 | 株式会社Kmw | Time division duplex antenna device |
| CN114270712B (en) * | 2019-06-04 | 2023-12-08 | 株式会社Kmw | Time division duplex antenna device |
| US11936417B2 (en) | 2019-06-04 | 2024-03-19 | Kmw Inc. | Time-division duplex antenna apparatus |
| CN112737605A (en) * | 2020-12-29 | 2021-04-30 | Oppo广东移动通信有限公司 | Antenna switching circuit and method and electronic equipment |
| CN112737605B (en) * | 2020-12-29 | 2022-08-16 | Oppo广东移动通信有限公司 | Antenna switching circuit, method and electronic equipment |
| CN112910535A (en) * | 2021-02-05 | 2021-06-04 | 陕西天基通信科技有限责任公司 | System and method for improving coverage efficiency of 5G repeater |
| CN112910535B (en) * | 2021-02-05 | 2023-03-24 | 陕西天基通信科技有限责任公司 | Method for improving coverage efficiency of 5G repeater |
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| CN100426703C (en) | 2008-10-15 |
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