CN101447817A - Device and method for diversity reception and transmission of TD-SCDMA mobile communication systems - Google Patents
Device and method for diversity reception and transmission of TD-SCDMA mobile communication systems Download PDFInfo
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Abstract
The invention discloses a device and a method for diversity reception and transmission of TD-SCDMA mobile communication systems in a wireless base station which uses two antennas and an RF transceiver connected. The installation space of the antennas is at least dozens of working wavelengths. The invention solves the problems of poor relativity formed by the antennas and the RF transceiver connected, difference of time delay and phase of signals received by 2 completely irrelevant links of a transceiving link and a user terminal. The invention solves the problem of low user density of rural and suburban districts which need big area coverage radius. The cost of each base station may be reduced by more than 20%.
Description
Technical field
The present invention is that the TD-SCDMA mobile communication system of 3G (Third Generation) Moblie is used in outdoor macro cell when covering, and the technology of diversity reception and emission especially relates to the apparatus and method that a kind of TD-SCDMA mobile communication system is used diversity reception and emission.
Background technology
Be used in outdoor macro cell when covering in third generation TD-SCDMA mobile communication system, the wireless base station device of each designed manufacturing of device fabrication producer all uses the smart antenna of forming to unit 8 by 6 at present.In using at the scene, it is bigger that the user proposes antenna size, problems such as project installation difficulty.As everyone knows, the TD-SCDMA system just is being to use intelligent antenna technology, and having reached all code channels can both provide the professional result who uses, and this is the advantage of smart antenna.Using smart antenna, can improve power system capacity, reduce transmitting power and improve receiving sensitivity, is a significant development direction of antenna technology.But, the use scene of mobile communication system is Protean, for example in the outer suburbs and vast rural area, user density is low, but the coverage of each base station is subjected to the restriction of hand-held set transmitting power again, at this moment, the capacity of every base station has not been the main problem of considering, factor such as equipment cost and engineering difficulty when prior.In these environments for use, can consider in second generation mobile communication system (as GSM, cdma etc.), to have used diversity technique for many years.In second generation mobile communication system, in GSM and IS-95CDMA system,, extensively adopted reception diversity technology in order to improve the receiving feature of wireless base station; In the frequency division systems such as WCDMA and cdma2000 of 3G (Third Generation) Moblie, equally extensively adopted reception diversity technology.This technology and base station constitute as shown in Figure 1: it constitutes antenna system by pointing to area of coverage reception antenna 101 and antenna 102, transmitting antenna 103.Wherein, enough spatial separation (usually more than the dozens of wavelength) to be arranged between the antenna 101 and 102.Antenna 101 is connected to radio-frequency transmitter 111, and antenna 102 is connected to radio-frequency transmitter 112, and this two received signal that receives only machine is closed the road in mixer 120, enter baseband processor 130 then.Then being fed to transmitting antenna 103 by radio frequency sending set 113 simply from transmitting of baseband processor 130 launches.The diversity reception algorithm of this device is finished in mixer, and it can be that the road is closed in simulation, also can be that numeral is closed the road; Can also can select or other adaptive algorithm with being combined to switch.Use receive diversity, can improve the receptivity of upward signal greatly, this has been that industry is well-known.In the past between decades, people have also analyzed advantage and the possibility of using transmit diversity: obviously, if with the identical thinking of receive diversity, use two transmitting antennas and transmitter, allow the same signal while homophase of two antenna emissions arrive user terminal, then can realize transmit diversity, improve the performance of down link greatly.But problem is: to frequency division duplex system, different carrier frequencies is adopted in up-downgoing, reception and transmitting antenna are at regular intervals again, can predict downlink electrical wave propagation characteristic (comprising decline and time delay etc.) without any method, so up to now, the transmit diversity systems that uses without any reality occurs.More do not see the report of usage space diversity technique in the TD-SCDMA mobile communication system.
Summary of the invention
The objective of the invention is to propose in a kind of 3G (Third Generation) Moblie TD-SCDMA system, the TD-SCDMA mobile communication system diversity reception of usage space diversity and the apparatus and method of emission in the wireless base station, two problems that correlation is very poor of radio-frequency (RF) transceiver formation that solve two antennas and be connected; Solve complete incoherent receiving-transmitting chain and from the signal that is received by these two links of user terminal key issues such as all different on time delay and phase place; Solve the low problem that needs big covering radius again of user density such as rural area, exurb district.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of TD-SCDMA mobile communication system is used the device of diversity reception and emission, this device uses two antennas and finishes receive diversity with the radio-frequency transmitter that antenna is connected respectively, and described device also uses above-mentioned two antennas and realizes transmit diversity with the radio frequency sending set that antenna is connected respectively.
Described two antennas are respectively main antenna and diversity antenna, they connect the radio-frequency transmitter of primary path and the radio-frequency transmitter and the transmitter of transmitter and diversity path respectively, and the radio-frequency transmitter of above-mentioned primary path is connected digital intermediate frequency down converter and upconverter respectively with transmitter; The radio-frequency transmitter of above-mentioned diversity path is connected digital intermediate frequency down converter and upconverter respectively with transmitter, above-mentioned low-converter and output divide in the mixer reception data of synthetic diversity in numeral, enter baseband processor again, finish the up reception of base station; Emission data from baseband processor enter numeral branch mixer, finish the digital demultiplexing of transmit diversity, deliver to above-mentioned upconverter and upconverter again, by the radio frequency sending set and the antenna emission of primary path and diversity path, finish transmit diversity respectively.
The installing space of described two antennas is the dozens of operation wavelength at least, and it is very poor that these two antennas and the radio-frequency (RF) transceiver that is connected thereof constitute two correlations, even complete incoherent receiving-transmitting chain.Radio-frequency (RF) transceiver is made of radio-frequency transmitter and radio frequency sending set.
Described two antennas are single antenna or the antenna array that is made of many antennas.
Use the device of TD-SCDMA mobile communication system diversity reception and emission, can realize a kind of TD-SCDMA mobile communication system use diversity reception and method for transmitting, this method comprises that two receive link, after these two received signals that receive the link radio-frequency transmitters are carried out digital sampling, with delay inequality and the phase differences of intermediate code acquisition known in the TD-SCDMA subscriber signal from two reception links, with digital method delay inequality and phase difference are compensated then, carry out the homophase addition again, carry out Digital Signal Processing then, finish diversity reception; In next subframe, to launch digital signal when delivering to these two transmitting chains, two delay inequality and phase differences that receive links that use preceding method to obtain carry out pre-weighting to this digital signal, add a fixed response time and phase place, and then, realize transmit diversity by these two transmitting chain emissions.
With the apparatus and method of diversity reception of above-mentioned TD-SCDMA mobile communication system and emission mainly is to be applied in to realize the base station space diversity on the base station, and two antennas and the radio-frequency (RF) transceiver that is connected (radio-frequency (RF) transceiver is made of radio-frequency transmitter and radio frequency sending set) are used in this space diversity base station.The installing space of these two antennas is the dozens of operation wavelength at least.It is very poor that these two antennas and the radio-frequency (RF) transceiver that is connected thereof constitute two correlations, even complete incoherent receiving-transmitting chain.All different on time delay and phase place from the signal that is received by these two links of user terminal.After these two received signals that receive the link radio-frequency transmitters are carried out digital sampling, with delay inequality and the phase differences of intermediate code known in the TD-SCDMA subscriber signal (Midamble) acquisition from two reception links, and this delay inequality and phase difference are compensated with digital method, carry out the homophase addition again, carry out Digital Signal Processing then, finish diversity reception.In next subframe, to launch digital signal when delivering to these two transmitting chains, two delay inequality and phase differences that receive link that use preceding method to obtain carry out pre-weighting to this digital signal: add a fixed response time and phase place, and then, realize transmit diversity by these two transmitting chain emissions.Every antenna can be a single antenna in above-mentioned two antennas, also can be an antenna array of being made up of many single antenna.
The invention has the beneficial effects as follows: solved two antennas and the radio-frequency (RF) transceiver that is connected constitutes two problems that correlation is very poor, solved complete incoherent receiving-transmitting chain and from the signal that is received by these two links of user terminal key issues such as all different on time delay and phase place.The invention solves the low problem that needs big covering radius again of user density such as rural area, exurb district.Every base station cost of using the apparatus and method of TD-SCDMA mobile communication system diversity reception and emission may reduce more than 20%, and it will be more competitive making product like this.
Description of drawings
Fig. 1 is the existing wireless base station block diagram that uses diversity reception;
Fig. 2 is the TD-SCDMA wireless base station block diagram with reception and transmit diversity, the apparatus and method of TD-SCDMA mobile communication system of the present invention diversity reception and emission are mainly used on the wireless base station, and the present invention will have the TD-SCDMA wireless base station of reception and transmit diversity as embodiments of the invention.
Fig. 3 is that the present invention's numeral is divided mixer schematic block diagram figure; In Fig. 3, mixer 320 and number splitter 330 are hardware, and other parts are software.
Embodiment
Apparatus of the present invention are used two antennas and are finished receive diversity with the radio-frequency transmitter that antenna is connected respectively, and described device also uses above-mentioned two antennas and realizes transmit diversity with the radio frequency sending set that antenna is connected respectively.Apparatus of the present invention can describe in detail with the wireless base station among Fig. 2.This TD-SCDMA base station 200 with diversity feature will connect two antennas: main antenna 201 and diversity antenna 202, they connect the TD-SCDMA radio-frequency transmitter 211 of primary path and the TD-SCDMA radio-frequency transmitter 213 and the transmitter 214 of transmitter 212 and diversity path respectively.Above-mentioned main antenna 201 and diversity antenna 202 all can be individual antennas, also can be the antenna arrays that is made of many antennas.The TD-SCDMA radio-frequency transmitter 211 of above-mentioned primary path is connected digital intermediate frequency down converter 221 and upconverter 222 respectively with transmitter 212; The TD-SCDMA radio-frequency transmitter 213 of above-mentioned diversity path is connected digital intermediate frequency down converter 223 and upconverter 224 respectively with transmitter 214.Above-mentioned low-converter 221 and 223 output divide the reception data of synthetic diversity in the mixer 230 in numeral, enter baseband processor 240 again, finish the up reception of base station.Emission data from baseband processor 240 enter numeral branch mixer 230, finish the digital demultiplexing of transmit diversity, deliver to above-mentioned upconverter 222 and 224 again, respectively by two paths: the radio frequency sending set of primary path and diversity path and antenna emission, finish transmit diversity.The installing space of described two antennas is the dozens of operation wavelength at least, and it is very poor that these two antennas and the radio-frequency (RF) transceiver that is connected thereof constitute two correlations, even complete incoherent receiving-transmitting chain.Radio-frequency (RF) transceiver is made of radio-frequency transmitter and radio frequency sending set.Above-mentioned radio-frequency transmitter 211, radio-frequency transmitter 213 can adopt the existing existing device of realizing the receive diversity device.Above-mentioned radio frequency sending set 212, digital intermediate frequency low-converter 221, digital intermediate frequency up-converter 222, radio frequency sending set 214, digital intermediate frequency low-converter 223, digital intermediate frequency up-converter 224 can adopt existing device to realize, and hardware and road device 320 and digital demultiplexer in the numeral branch mixer 230, the hardware in the baseband processor 240 also can adopt existing device to realize.
Fig. 3 shows in this TD-SCDMA base station with diversity feature that numeral divides mixer 230 and baseband processor 240 to be finished by 1-2 digital signal processor DSP, and baseband processor 240 can adopt the existing existing device of realizing the receive diversity device.Numeral among Fig. 2 is divided the detailed formation of mixer 230, be to realize that by hardware (mixer 320 and digital demultiplexer 330) and software (seeing the step 301,302,311,312,331,332 among Fig. 3) software among Fig. 3 is carrier with the digital signal processor DSP.
A kind of TD-SCDMA mobile communication system is used diversity reception and method for transmitting, received signal is divided the reception data of synthesizing diversity in the mixer 230 through main antenna 201, radio-frequency transmitter 211, digital intermediate frequency low-converter 221 and diversity antenna 202, radio-frequency transmitter 213,223 outputs of digital intermediate frequency low-converter in numeral respectively, enter baseband processor 240 again, finish the up reception of base station.Emission data from baseband processor 240 enter numeral branch mixer 230, finish the digital demultiplexing of transmit diversity, deliver to upconverter 222 and upconverter 224 again, by radio frequency sending set 212, main antenna 201 and radio frequency sending set 214, diversity antenna 202 emissions of primary path and diversity path, finish transmit diversity respectively.
In said method, comprise that in receiving course two receive link, after these two received signals that receive the link radio-frequency transmitters are carried out digital sampling, with delay inequality and the phase differences of intermediate code acquisition known in the TD-SCDMA subscriber signal from two reception links, with digital method delay inequality and phase difference are compensated then, carry out the homophase addition again, carry out Digital Signal Processing then, finish diversity reception; In next subframe, to launch digital signal when delivering to these two transmitting chains, two delay inequality and phase differences that receive link that use preceding method to obtain carry out pre-weighting to this digital signal, add a fixed response time and phase place, and then, realize transmit diversity (seeing below auspicious stating) by these two transmitting chain emissions.
A kind of TD-SCDMA mobile communication system uses telling about in detail of diversity reception and method for transmitting as follows: signal divides the reception data of synthesizing diversity in the mixer 230 through main antenna 201, radio-frequency transmitter 211, digital intermediate frequency low-converter 221 and diversity antenna 202, radio-frequency transmitter 213,223 outputs of digital intermediate frequency low-converter in numeral respectively, enter baseband processor 240 again, finish the up reception of base station.Emission data from baseband processor 240 enter numeral branch mixer 230, finish the digital demultiplexing of transmit diversity, deliver to upconverter 222 and upconverter 224 again, by radio frequency sending set 212, main antenna 201 and radio frequency sending set 214, diversity antenna 202 emissions of primary path and diversity path, finish transmit diversity respectively.The first step in digital mixer (301,302) is in a TD-SCDMA subframe (5ms), obtains the time of advent of each code channel, and be t the time of advent of establishing i code channel in the primary path of acquisition
I0, be t the time of advent of i code channel of diversity path
I1, and it is poor to calculate these two times of advent
δt＝t
i0-t
i1
The method that more than obtains each code channel time of advent is the time of advent of measuring every code channel intermediate code (Midamble).Because all intermediate codes all are known, can simply ask relevant process with one, determine this time of advent with the position of relevant peaks.
Second step (301,302) in digital mixer is in a TD-SCDMA subframe (5ms), obtains the phase difference of the signal of each code channel, and the phase place of establishing i code channel signal in the primary path of acquisition is
, be the time of advent of i code channel of diversity path
, and it is poor to calculate these two times of advent
The method that more than obtains each code channel time of advent is to measure the phase place of every code channel intermediate code (Midamble).Because all intermediate codes all are known, the component of this known code on I and Q data flow just determined the phase place of this code stream.
The 3rd step (311,312) in digital mixer is that the time delay and the phase place of primary path and diversity path are adjusted and compensated: if the method for delay compensation is the t time of advent of i code channel in the primary path
I0The t time of advent greater than i code channel of diversity path
I1, then the data with the diversity path increase a time delay δ t; Otherwise, if the t time of advent of i code channel in the primary path
I0The t time of advent less than i code channel of diversity path
I1, then the data with primary path increase a time delay δ t.The method of phase compensation is the phase place of phase place increase with diversity path data
After the adjustment of having finished time delay and phase place and compensation, the data of above-mentioned two paths are done and (being realized by mixer 320), just finished diversity reception, these data just can enter baseband processor (among Fig. 2 240) and finish the reception data processing.
In digital demultiplexer 330, then be that the emission data from baseband processor are divided into identical two-way, if the above-mentioned δ t that records greater than 0, then postpones a time delay δ t with one the tunnel and is sent to main emission path (331), and another road is deducted a phase place
And be sent to diversity path (332); If the above-mentioned δ t that records less than 0, then directly is sent to main emission path with one the tunnel, and another road is postponed a time delay δ t, and deduct a phase place
Be sent to diversity path (332) again, so realize transmit diversity.
In addition, the omnidirectional channel of this TD-SCDMA system is launched with single antenna as channels such as guiding, broadcasting and pagings, does not adopt transmit diversity.Primary path and diversity path can be standby each other.
Claims (5)
1, a kind of TD-SCDMA mobile communication system is used the device of diversity reception and emission, this device uses two antennas and finishes receive diversity with the radio-frequency transmitter that antenna is connected respectively, it is characterized in that: described device also uses above-mentioned two antennas and realizes transmit diversity with the radio frequency sending set that antenna is connected respectively.
2, TD-SCDMA mobile communication system according to claim 1 is used the device of diversity reception and emission, it is characterized in that: described two antennas are respectively main antenna (201) and diversity antenna (202), they connect the radio-frequency transmitter (211) of primary path and the radio-frequency transmitter (213) and the transmitter (214) of transmitter (212) and diversity path respectively, and the radio-frequency transmitter of above-mentioned primary path (211) is connected digital intermediate frequency down converter (221) and upconverter (222) respectively with transmitter (212); The radio-frequency transmitter of above-mentioned diversity path (213) is connected digital intermediate frequency down converter (223) and upconverter (224) respectively with transmitter (214), the output of above-mentioned low-converter (221) and low-converter (223) divides the reception data of synthesizing diversity in the mixer (230) in numeral, enter baseband processor (240) again, finish the up reception of base station; Emission data from baseband processor (240) enter numeral branch mixer (230), finish the digital demultiplexing of transmit diversity, deliver to above-mentioned upconverter (222) and upconverter (224) again, by the radio frequency sending set and the antenna emission of primary path and diversity path, finish transmit diversity respectively.
3, TD-SCDMA mobile communication system according to claim 1 and 2 is used the device of diversity reception and emission, it is characterized in that: the installing space of described two antennas is the dozens of operation wavelength at least, it is very poor that these two antennas and the radio-frequency (RF) transceiver that is connected thereof constitute two correlations, even complete incoherent receiving-transmitting chain.
4, TD-SCDMA mobile communication system according to claim 1 and 2 is used the device of diversity reception and emission, it is characterized in that: described two antennas are single antenna or the antenna array that is made of many antennas.
5, a kind of TD-SCDMA mobile communication system is used diversity reception and method for transmitting, comprise that two receive link, it is characterized in that: after the received signal of these two reception link radio-frequency transmitters is carried out digital sampling, with delay inequality and the phase differences of intermediate code acquisition known in the TD-SCDMA subscriber signal from two reception links, with digital method delay inequality and phase difference are compensated then, carry out the homophase addition again, carry out Digital Signal Processing then, finish diversity reception; In next subframe, to launch digital signal when delivering to these two transmitting chains, two delay inequality and phase differences that receive links that use preceding method to obtain carry out pre-weighting to this digital signal, add a fixed response time and phase place, and then, realize transmit diversity by these two transmitting chain emissions.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011026258A1 (en) * | 2009-09-07 | 2011-03-10 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for cell combination |
| CN102934371A (en) * | 2010-05-14 | 2013-02-13 | 阿尔卡特朗讯 | Multiple antenna method for reducing inter-cell interference in multi-user wireless ststems |
| CN103888984A (en) * | 2012-12-19 | 2014-06-25 | 中兴通讯股份有限公司 | Method of base station radio frequency unit redundant hot backup and system thereof |
| CN106330384A (en) * | 2015-07-09 | 2017-01-11 | 福建澳瀚信息技术有限公司 | Frequency domain blocking type wireless signal blocking device and method |
| WO2019228112A1 (en) * | 2018-05-28 | 2019-12-05 | 华为技术有限公司 | Method, apparatus and system for transmitting radio frequency signal |
| CN111180902A (en) * | 2020-02-13 | 2020-05-19 | 惠州Tcl移动通信有限公司 | MIMO system, method for distinguishing signals by MIMO system and mobile terminal thereof |
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| EP1069707A1 (en) * | 1999-07-13 | 2001-01-17 | Motorola, Inc. | Transmit diversity transmitter and receiver for radio communications systems |
| US6839326B1 (en) * | 2000-09-26 | 2005-01-04 | Nokia Corporation | Antenna phase estimation algorithm for WCDMA closed loop transmitter antenna diversity system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011026258A1 (en) * | 2009-09-07 | 2011-03-10 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for cell combination |
| CN102934371A (en) * | 2010-05-14 | 2013-02-13 | 阿尔卡特朗讯 | Multiple antenna method for reducing inter-cell interference in multi-user wireless ststems |
| US8995401B2 (en) | 2010-05-14 | 2015-03-31 | Alcatel Lucent | Multiple antenna method and apparatus for reducing inter-cell interference in multi-user wireless systems |
| CN103888984A (en) * | 2012-12-19 | 2014-06-25 | 中兴通讯股份有限公司 | Method of base station radio frequency unit redundant hot backup and system thereof |
| WO2014094473A1 (en) * | 2012-12-19 | 2014-06-26 | 中兴通讯股份有限公司 | Redundant hot backup method and system for base station radio frequency unit |
| RU2611435C2 (en) * | 2012-12-19 | 2017-02-22 | ЗетТиИ Корпорейшн | Method and system of base station radio frequency unit excess hot backup |
| CN106330384A (en) * | 2015-07-09 | 2017-01-11 | 福建澳瀚信息技术有限公司 | Frequency domain blocking type wireless signal blocking device and method |
| CN106330384B (en) * | 2015-07-09 | 2019-03-08 | 福建澳瀚信息技术有限公司 | A kind of frequency domain blocking type wireless signal blocking-up method |
| WO2019228112A1 (en) * | 2018-05-28 | 2019-12-05 | 华为技术有限公司 | Method, apparatus and system for transmitting radio frequency signal |
| CN110545113A (en) * | 2018-05-28 | 2019-12-06 | 上海华为技术有限公司 | Radio frequency signal transmitting method, device and system |
| CN111180902A (en) * | 2020-02-13 | 2020-05-19 | 惠州Tcl移动通信有限公司 | MIMO system, method for distinguishing signals by MIMO system and mobile terminal thereof |
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Effective date of registration: 20181205 Address after: 610041 High-tech Incubation Park Building 6, North Tianfu Avenue, Chengdu High-tech Zone, Sichuan Province Patentee after: Chengdu core software Co., Ltd. Address before: 610041 High-tech Hatching Garden Building 6, Tianfu Avenue South Extension, Chengdu High-tech Zone, Sichuan Province, 3 floors Patentee before: Chengdu NTS Technology Co., Ltd. |
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