CN100388654C - Implemnentation of wide-band CDMA base station physical level based on multibeam antenna - Google Patents
Implemnentation of wide-band CDMA base station physical level based on multibeam antenna Download PDFInfo
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Abstract
The present invention relates to a realization method for a wideband code division multiple access base station physical layer on the basis of a multiple beam antenna. The present invention comprises that beams of a multiple beam antenna system are formed; a certain number of beams construct a multiple beam network with a certain combining form; under a multiple beam network structure, the functions of the physical layer of the concept of a wideband code division multiple access cell is completed through the diversity reception of beams of a cell reverse link and the transmission diversity of STTD coding beams of a forward link. Because the method organically combines the technique of multiple beam intelligent antennas with the techniques of angle diversity and STTD transmission diversity together to fully exert the decoding capacity of the STTD of a mobile station, the problem of asymmetrical capacities of up and down links is effectively solved.
Description
The present invention relates to code division multiple access (CDMA) communication technology, be specifically related to multi-beam intelligent antenna in the cdma communication Application for Field, more particularly, relate to physical layer function that the Wideband Code Division Multiple Access (WCDMA) of utilizing the array antenna technology to finish defined in the 3GPP agreement (Wideband CodeDivision Multiple Access, following abbreviation WCDMA) has and be a kind of physical layer implementation method of the WCDMA base station based on multi-beam antenna.
Mobile communication technology is worldwide flourish, Wideband Code Division Multiple Access (WCDMA) (WCDMA) with its compatible second generation mobile communication system, global roaming, have distinguishing features such as multimedia function, low in energy consumption, lamprophonia and be listed in one of 3G (Third Generation) Moblie technical standard.Three standards of 3G (Third Generation) Moblie technology all adopt CDMA (code division multiple access) technology at present.CDMA technology is got up according to the spread spectrum communication theoretical developments, has that the signal power spectrum density is low, security performance good, be easy to realize characteristics such as voice activation, so CDMA technology is widely used in military field in early days.After CDMA technology was applied to near-far interference that moving communicating field faces, signal technological difficulties such as decline are overcome fast, CDMA had been subjected to favor in the wireless mobile communications field.
The residing wireless propagation environment of mobile communication usually is more abominable.In wireless environments such as city, suburb, rural area, radio wave propagation will be subjected to the influence of reflection, refraction, diffraction of random distribution barrier etc.The signal of transmitting station emission will could arrive receiving terminal through a plurality of paths through repeatedly reflecting, reflecting.And these radio propagation conditions also constantly change, wherein with urban environment for very.Using under the CDMA technology condition, travelling carriage or the signal that the base station received are the composite signals from a plurality of different paths arriving signal, if the arrival delay-time difference of these multipath signals is in the time of a chip, then they can not be differentiated in the Multipath searching of receiver, so this composite signal will show among the jumbo lasting variation of rising and falling, i.e. fade-out; On the other hand, if multipath is distributed in a plurality of chips, receiving terminal can be observed a plurality of decline processes in different chips, and the correlation between these decline processes is very low; The 3rd, from the angle of multipath signal arrival receiver, the distribution of the space angle of arrival of multipath signal is clocklike, and the amplitude fading characteristic of the multipath signal of the different angles of arrival is also uncorrelated.This has brought opportunity for overcoming fade-out.
For overcoming fade-out, several different methods has been arranged, wherein, diversity reception and emission are to one of anti fading effective technology.Diversity reception is the incoherent character of multipath reception signal fadeout characteristic of utilizing amplitude fading in the propagation environment of radio wave, promptly to occur amplitude deep fading's probability simultaneously very little for the multipath signal of Jie Shouing, realize received signal " learning from other's strong points to offset one's weaknesses ", thereby improve the signal to noise ratio of received signal.Diversity receiving technology can be divided into polarization diversity, angle diversity, space diversity, transmit diversity etc. according to the source difference of diversity signal.For example, Chinese patent application number is the patent that 96194111.1 patent " method of angle diversity is provided, and base station equipment " discloses a kind of use angle diversity technique.
Above-mentioned fade-out also is present in base station and travelling carriage simultaneously.Use that technology such as diversity, coding overcome that the equipment that fade-out brings is complicated, cost increases, volume increases the base station influence not quite, but is exactly the factor of can not ignore to travelling carriage.3G (Third Generation) Moblie WCDMA standardization body the 3rd generation partner program (3 for this reason
RdGenerationPartnership Project, following abbreviation 3GPP) adopt Space Time Coding transmission diversity (Space-Time Transmission Diversity, following abbreviation STTD), utilize transmit diversity techniques to overcome the fade-out of mobile you.Respectively in different antenna emissions, but this uses intelligent antenna technology to bring challenge to the base station to standard with the STTD coding.The document that Marcos Katz and JuhaYlitalo write " Extension of Space-Time coding to beamformingWCDMA base stations " has brought facility for support STTD coding transmit diversity techniques in multi-beam antenna.
In cellular communication environment, for satisfying the needs of multiple business and global roaming, wireless network is made of big and small honeycomb, and macrocellular is used at a high speed, the zone that traffic density is low, and cellulor then covers low speed, zone that traffic density is high.Microcellulor then is applicable to office building, business district etc.The statistical property of radio transmission is widely different in these several zoness of different.Antenna for base station grand usually, cellulor sets up than higher, and the angle of arrival of mobile subscriber's signal that this antenna arrangement receives appears in the smaller angle spreading range of direct projection path direction with bigger probability; The antenna for base station of microcellulor sets up lower, and antenna " floods that " in numerous surrounding buildings things, the signal that it received is equiprobably from different directions.Mobile portable antennas is all lower in these cellular zones, so the travelling carriage received signal is also equiprobably from different directions.
CDMA mobile communication system is a self-interference system.Multiple-beam array antenna can spatially be divided the self-interference signal that receives and come, and reduces the degree of self-interference.For reducing self-interference, the implementation of multiple-beam array antenna has the wave beam mode of dynamic wave beam mode, static state usually.Chinese patent " method of angle diversity is provided, and base station equipment " is exactly a kind of dynamic beam mode as previously mentioned, and utilizes the dynamic beam mode that the angle diversity method of reseptance is provided.It is not remarkable that this mode is applied in following the usefulness that can bring of macrocellular situation, says as this patent publication, and at this moment subscriber signal arrives the angle of arrival of base station usually near the through ray between travelling carriage and base station.Because the restriction of base station cost, installation aspect, the width of wave beam usually will be much larger than the angle spread of the angle of arrival.Thereby, use this patented method, determine the angle of arrival sensing of definite dynamic beam more earlier, its cost effectiveness height, the precision of this angle of arrival method of estimation is not high yet simultaneously.On the other hand, the 3GPP of international organization that is responsible for 3G (Third Generation) Moblie is at wireless access network UTRAN (universal land radio access web, the abbreviation of " Universal TerrestrialRadio Access Network ") in, Space Time Coding transmit diversity STTD technology is incorporated in the down link of physical link.Though the STTD technology is a possibility in the base station, but travelling carriage is compulsory to the support of this technology, and in above-mentioned publication, fails to utilize the STTD technology, and for down link, this point will make power system capacity affect adversely.Even more serious is that RTT (Radio Transmission Technology, the abbreviation of Radio TransmissionTechnology) the candidate scheme WCDMA draft of submitting in 1998 shows that down link is the bottleneck of cdma system capacity.
The objective of the invention is in the wireless access network UTRAN of 3GPP, to propose a kind of method of the WCDMA of realization physical layer, specifically comprise the method for Space Time Coding transmit diversity STTD technology of the angle diversity reception technique that utilizes the multiple-beam array antenna technology to realize uplink signal simultaneously and down link and the overall plan of these two kinds of technology of integration.This method can overcome the above-mentioned shortcoming that prior art exists, and under the prerequisite that does not reduce uplink performance, improves to amplitude peak the performance of down link.
The object of the present invention is achieved like this, constructs a kind of wide-band CDMA base station physical layer implementation method based on multi-beam antenna, may further comprise the steps:
The formation of multibeam antenna system wave beam;
Multiple beam forming network by a certain number of beam configurations particular combinations form;
Under the multiple beam forming network tissue, beam transmission diversity that the beam diversity by the sub-district reverse link receives and the STTD of forward link encodes is finished the physical layer function of WCDMA sub-district notion.
In according to the wide-band CDMA base station physical layer implementation method based on multi-beam antenna provided by the invention, the formation wave beam of described multibeam antenna system wave beam forms and is included in the rf wave signal that uplink direction receives space different directions arrival, radio-frequency front-end is converted into baseband signal and delivers to digital multi-beam figuration network, and form beamformer output signal and deliver to the back level and carry out Multipath searching, follow the tracks of, RAKE merges, the processing angulation diversity-wave of downlink information number process weighting figuration network and rf modulations unit and the public wave beam of the full sector of covering.
In according to the wide-band CDMA base station physical layer implementation method based on multi-beam antenna provided by the invention, described multiple beam forming network by a certain number of beam configurations particular combinations form may further comprise the steps: the base station is divided into several sub-districts with communication service area, each sub-district has the wave beam unit of described a certain number of (as 6) to constitute multiple beam forming network, wherein, half (as 3) are used for up direction, second half (3) are used for down direction, in a plurality of (3) wave beam unit of uplink and downlink direction, cover full sub-district as public wave beam with a wave beam unit respectively, all the other wave beams of up link and down link, the part of each each coverage sector of wave beam, but it is combined can cover full sub-district, and the public wave beam of neighbor cell is provided with the district of overlapping.
In according to the wide-band CDMA base station physical layer implementation method based on multi-beam antenna provided by the invention, described under the multiple beam forming network tissue, the physical layer function that beam transmission diversity that the beam diversity by the sub-district reverse link receives and the STTD (Space Time Coding transmission diversity) of forward link encodes is finished WCDMA sub-district notion may further comprise the steps:
Up common beam realizes the reception of common channel, up diversity-wave is realized the diversity reception of special use or partial common channel, descending public wave beam is realized the emission of common channel, and descending diversity-wave is realized the STTD coded diversity emission of special use or partial common channel.
In the above-mentioned Common transport channel that must in full sub-district, broadcast or receive by public beams carry, the BCH of WCDMA system (refers to broadcast channel, the abbreviation of Broadcast Channel), PCH (refers to paging channel, the abbreviation of Paging Channel) P-CPICH in transmission channel and the physical channel (refers to Primary Common Pilot Channel, the abbreviation of Primary Common PilotChannel), PICH (refers to Page Indication Channel, the abbreviation of Page Indicator Channel), AICH (refers to AICH Acquisition Indication Channel, the abbreviation of Acquisition Indicator Channel), SCH (refers to synchronizing channel, the abbreviation of Synchronization Channel) etc. in the intrafascicular downlink wave beam of public wave, launch, receive in RACH (referring to Random Access Channel, the abbreviation of the RandomAccessChannel) uplink beam of channel in common beam.
In the above-mentioned Common transport channel and dedicated channel that can in the segment space of sub-district, receive and launch by the diversity-wave carrying, the FACH that comprises forward direction (refers to forward access channel, the abbreviation of Forward Access Channel), DCH (refers to dedicated channel, the abbreviation of DedicatedChannel), S_CPICH (referring to auxiliary Common Pilot Channel, the abbreviation of SecondaryCommon Pilot Channel) and reverse DCH channel.
In the described Common transport channel and dedicated channel that can in the segment space of sub-district, receive and launch by diversity-wave carrying, comprise that direction difference, beam diversity according to link receive different with the mode of emission, definite or the reverse link in the sub-district carries out beam diversity and receives, and perhaps the forward link in the sub-district carries out STTD coding beam transmission diversity.
When the reverse link in the sub-district carries out the beam diversity reception, the signal of cell uplink is done angle diversity by two up diversity-waves and is received, the part multipath signal of two diversity-wave difference receiving mobile up links, two diversity-wave output signals merge improving the base station antijamming capability according to the RAKE method of reseptance, and the upward signal that is in the travelling carriage under the soft changing state carries out diversity reception by the diversity-wave of the sub-district in the soft handover area.
When the forward link in the sub-district carries out STTD coding beam transmission diversity, down link signal is done STTD Space Time Coding beam transmission diversity by the descending diversity-wave in the sub-district, substitute in the 3GPP agreement and do the emission of STTD Space Time Coding diversity by two slave antennas, constitute the Space Time Coding transmit diversity in the wave beam, wherein the required auxiliary Common Pilot Channel of STTD decoding is launched in corresponding diversity-wave, wherein, " corresponding " the special-purpose Space Time Coding of emission will be complementary with the auxiliary public guide frequency that is used for channel estimating of the coding wireless path that passes through in the expression wave beam.
According to method provided by the invention, uplink downlink common channel information in the sub-district receives in public wave beam and launches, as the BCH in the 3GPP agreement, SCH, CCPCH (referring to Common Control Physical Channel, the abbreviation of Common Control Physical Channel) or the like.Dedicated channel information is carried out up angle diversity reception and descending STTD Space Time Coding diversity emission in two diversity-waves, as the DPCH channel in the 3GPP agreement.But do not get rid of the public wave beam of uplink downlink and be used to receive dedicated channel information yet.
Implement a kind of wide-band CDMA base station physical layer implementation method provided by the invention based on multi-beam antenna, compared with prior art, because multi-beam intelligent antenna technology and angle diversity and STTD transmit diversity techniques are organically combined, give full play to the STTD decoding capability of travelling carriage, thereby solved the capacity asymmetry problem of uplink downlink effectively.
Below in conjunction with drawings and Examples, further specify characteristics of the present invention, among the figure:
Fig. 1 illustrates the way of realization of a kind of possible array antenna uplink beam unit that the inventive method is used;
Fig. 2 illustrates the way of realization of a kind of possible array antenna downlink wave beam unit that the inventive method is used;
The sub-district conceptual model that Fig. 3 explanation realizes with multiple beam forming network according to the inventive method;
Fig. 4 explanation realizes a kind of way of realization that angle diversity receives according to the inventive method with the diversity-wave combination;
Fig. 5 explanation realizes a kind of way of realization of the STTD Space Time Coding transmit diversity in the beam space with the diversity-wave combination according to the inventive method;
Fig. 6 explanation realizes auxiliary Common Pilot Channel method for transmitting according to the inventive method with diversity-wave;
The method flow of WCDMA physical-layer techniques is integrated in Fig. 7 explanation with the multi-beam antenna technology according to the inventive method.
Fig. 1 is the way of realization of a kind of possible array antenna uplink beam unit that uses of the present invention.As shown in Figure 1, in the base station that the inventive method is used, radio-frequency front-end 2 and one that is connected radio-frequency front-end 2 digital multi-beam figuration network 3 that its radio receiver comprises antenna array 1 that a plurality of antenna elements form, is made of its number baseband conversion unit identical with the antenna element number.Wherein, antenna array 1 can be a Frequency Division Duplexing (FDD), also can be made of two different stand-alone antenna battle arrays of centre frequency as required, is respectively applied for uplink downlink.Example explanation antenna array 1 among the figure can receive the rf wave signal that the space different directions arrives when being used for uplink direction, radio-frequency front-end 2 is responsible for being converted into baseband signal, and the same source signal of different time arrival shows as signal and produces different phase shift on base band like this.Baseband signal is delivered to digital multi-beam figuration network 3, has only illustrated to form the digital multi-beam figuration network of a wave beam among the figure.The subscriber signal that the different antennae unit receives in the antenna array 1 is interfered mutually because phase place is different, and forms output signal 4.Usually level was carried out Multipath searching, tracking, RAKE merging etc. after beamformer output signal 4 was delivered to.The weight w that wave beam forms
1-w
NDetermine by the network planning.Up link is formed two angle diversity wave beams needs two groups of different weights, and forming a public wave beam that covers full sector needs one group of weights in addition.
Fig. 2 has illustrated the way of realization of a kind of array antenna downlink wave beam unit that the inventive method may be used.Downlink wave beam is made of antenna array 8, rf modulations unit 7 and weighting figuration network 6 etc.The weight w of weighting
1-w
MWith up can be identical, also can be different.Two diversity-waves not up simultaneously when two groups of weights are called the angle diversity wave beam, and descending diversity-wave is called the STTD diversity-wave.Example of the present invention adopts identical weights, and unification is called diversity-wave, but hereinafter will replace diversity-wave with angle diversity wave beam and STTD diversity-wave when the differentiating uplink and downlink link.One of feature difference of the present invention and prior art is the symbol of descending STTD diversity-wave emission through the STTD coding, and two STTD diversity-waves are launched two-way STTD coded identification respectively.
According to the present invention, down link also need form a public wave beam that covers full sector except that forming two angle diversity wave beams.The shape-endowing weight value of descending public wave beam can be different from upper shaped weights.
According to the present invention, the design wave beam can adopt principle comparatively flexibly.As an example, the wave beam of Fig. 1 and Fig. 2 designs under the guidance of the network planning.As, the communication load situation skewness of base station selection region, lobe width was smaller when wave beam was designed in the sector that load is heavy, and the light sector lobe width of loading is big, so that evenly bear the sector load.
What Fig. 3 illustrated is the sub-district conceptual model of realizing with multiple beam forming network illustrated in figures 1 and 2.Wave beam 9,10th, according to four diversity-waves (the uplink downlink wave beam adopts same wave beam) of preceding method design, wave beam 11 is used by two public wave beams of up-downgoing.No matter wave beam 9 and wave beam 10 combining forms, coverage cell fully.To the also same requirement of the wave beam of down direction.Here, wave beam (or wave beam unit) constitutes the basic logic unit in the technical solution of the present invention.What wave beam was expressed is a kind of space of particular orientation, and the user can obtain maximum reception or emitted energy in this space.Method of the present invention is exactly after the multiple beam forming network tissue is finished, and uses multi-beam antenna to realize the method for WCDMA cell physical layer.The specific implementation process is to require like this: these wave beams (unit) institute covering space is the service clearance of WCDMA sub-district.The physical layer transmission function that the logic district of WCDMA has realizes in above-mentioned beam space.
See for the angle diversity-wave that from up link in more typical cellular communication system, when the rf wave signal of travelling carriage emission arrived the base station, its angle of arrival was distributed with certain statistical law.The multipath signal angle of arrival that arrives the base station concentrates near the direct path of travelling carriage and base station, and its angle spread is relevant with base station antenna height, and cell-site antenna is than the surrounding buildings object height usually, and angle spread is little like this.The ASSOCIATE STATISTICS that arrives angular distribution and multipath the analysis showed that it is big more that the angle of arrival differs, and the correlation of multipath is weak more, and the use angle diversity is favourable more.So it is moderate that base station antenna height is selected, wave beam lobe width height and angle spread adapt.The design of up public wave beam is a criterion to cover full sector as far as possible, and switch the sub-district of taking into account simultaneously between the sector.
From down link, though the up-downgoing frequency is inequality, the descending electric wave of launching according to the up angle of arrival according to the radio wave propagation rule can reach travelling carriage equally, and difference is that the amplitude fading and the up direction of arrival travelling carriage is uncorrelated, and phase change is also uncorrelated.Similar with up link, amplitude fading and phase change when the electric wave of different angle of departure emissions or multipath arrive travelling carriage also present incoherent characteristic, and this is the theoretical foundation of conventional art use angle diversity emission.But the defective of traditional angle diversity emission is, the multipath of angle diversity emission is no more than a chip if arrive the time difference of travelling carriage, and they will be differentiated, and they will be cancelled out each other when serious.So the angle diversity emission just becomes a double-edged sword, and the effect of diversity advantageously can be arranged, and disadvantageously will cause the indistinguishability of part multipath.Method of the present invention helps to overcome this contradiction, this example carries out the STTD coding with the information source information of the same user in two wave beams, and the STTD symbol after will encoding is launched in two diversity-waves, even two-way STTD coded identification arrives the time delay of travelling carriage and is no more than a chip, the STTD decoding technique also can parse it (referring to " Extension of Space-Time coding tobeamforming WCDMA base stations "), and this is advantage of the present invention place.The design of descending public wave beam is consistent with up link, is criterion to cover full sector as far as possible, and switch the sub-district of taking into account simultaneously between the sector.
Fig. 4 explanation realizes a kind of way of realization that angle diversity receives with the diversity-wave that the inventive method proposes.Fig. 4 is the continuation of Fig. 1 on signal flow, and the digital beam output signal of Fig. 1 has been suppressed partial noise, improves the signal to noise ratio of signal, and output signal flow 4 is given in the diversity-wave receiving system shown in Figure 4.Signal flow 4 contains abundant multipath signal, these multipath signals is collected can resist deep fade.Signal flow 4 is delivered to RAKE multipath merging device 15 and multipath searching device 17 respectively for this reason, another one diversity-wave signal flow 12 is also delivered to the RAKE multipath respectively and is merged device 15 and multipath searching device 17, the distribution situation of search multipath in multipath searching device, the time delay of several multipaths that selection is maximum, amplitude, phase place indication 16 are delivered in the RAKE merging device and are merged.Under cellular communication environment, multipath is distributed with in two diversity-waves that may appear at different sectors, this device example has been enumerated to distribute and has been crossed over the reception condition of two sectors, and the Multipath searching and the RAKE that carry out four diversity-wave signal flows 4,12,13,14 according to same principle merge.
Fig. 5 illustrates the method that realizes STTD Space Time Coding transmit diversity with the STTD diversity-wave of the present invention.The down link data bit stream 18,19,20 of user and interference user is through STTD coding, mapping, spread spectrum module 23,24, be divided into two-way STTD coded identification (STTD coding, mapping and spread spectrum process are the same with conventional method) after 25 respectively, two-way STTD coded identification is carried out the merging between the corresponding encoded symbol then, coded identification between the user is distinguished and is distinguished by spreading code, merges the back and forms two-way output encoder symbols streams 5,22.Encoded symbol streams 5 is delivered to down link STTD beam size enlargement apparatus shown in Figure 2, finishes the multi-beam diversity emission of STTD coding.Module 6 among Fig. 5 is arthmetic statements of module 6 among Fig. 2, promptly multiplies each other the combination of G in the algorithm or F function representation different user encoded symbol streams with STTD shaped-beam weights and symbols streams.In like manner encoded symbol streams 22 is delivered to the multi-beam emission that module 21 is finished another road STTD coding.
Fig. 6 illustrates that the inventive method is to realize an example of auxiliary Common Pilot Channel emission with the STTD diversity-wave.Travelling carriage carries out the impulse response that the STTD decoding need be known radio propagation channel, and traditional STTD method is launched two pilot signals and done channel estimating usefulness to travelling carriage on two diversity antennas.Example of the present invention is modulated to pilot signal on the STTD diversity-wave, as two frequency pilot signs among Fig. 6 shine upon respectively, user symbol behind the spread spectrum behind coding merges.Symbols streams after the merging is delivered to wave beam forming network 26 and is carried out the beam diversity emission.In wireless channel, frequency pilot sign and user symbol be through the same space channel, the response of travelling carriage by drawing wireless channel to two frequency pilot sign analyses, and utilize STTD decoding technique demodulation user symbol according to the result.
Fig. 7 illustrates the implementation method of the inventive method with multi-beam antenna technology integration WCDMA physical layer.The integration flow process of overall plan forms 29 from wave beam, and the direction of arrow shows the direction of signal flow.Arrow entity thickness shows at this has a plurality of wave beams to form, and needs the structure multiple beam forming network.The purpose that wave beam forms makes subscriber signal receive or the emitted energy maximum in the particular orientation space, comprises two aspects of uplink downlink.Fig. 1 and Fig. 2 are the refinements of these two processes.The input and output signal of wave beam is delivered to the tissue that carries out carrying signal in the multiple beam forming network, in the organizational process 30 of multiple beam forming network, according to the different division of labor of the Bearer Channel of wave beam a plurality of wave beams being combined according to form shown in Figure 3 covers whole sub-district, and this being arranged to finished the supporting body that the WCDMA physical-layer techniques provides signal processing in wave beam.In multi-beam structure shown in Figure 3, the various channel Mapping that the sub-district of WCDMA system has are carried transmission 31 in different wave beams, finish this load bearing process and realized by four flow processs: promptly comprise the reception 32 of up public wave beam realization common channel; Up diversity-wave is realized the diversity reception 33 of special use or partial common channel; Descending public wave beam is realized the emission 34 of common channel; Descending diversity-wave is realized the STTD coded diversity emission 35 of special use or partial common channel.
The inventive method is angle diversity and the Space Time Coding technology introduced simultaneously in the smart antenna field, and both are combined dexterously, lays the foundation for introduce intelligent antenna technology in 3G (Third Generation) Moblie.According to the 3GPP agreement, the portable terminal of following third generation communication system must be supported the STTD coding techniques, therefore utilize smart antenna exploitation STTD technology significant, not only help improving downlink capacity, also made full use of the STTD technical capability of travelling carriage, be an engineering with practical value, believe that this technology can wait until extensive use in the future.
Claims (6)
1. the wide-band CDMA base station physical layer implementation method based on multi-beam antenna is characterized in that, may further comprise the steps:
The formation of multibeam antenna system wave beam: receive the rf wave signal that the space different directions arrives at uplink direction, radio-frequency front-end is converted into baseband signal and delivers to digital multi-beam figuration network, and form beamformer output signal and deliver to the back level and carry out Multipath searching, tracking, RAKE and merge, the downlink signal is through the processing angulation diversity-wave of weighting figuration network and rf modulations unit and cover the public wave beam of full sector;
Multiple beam forming network by a certain number of beam configurations particular combinations form: the base station is divided into several sub-districts with communication service area, each sub-district has 2N wave beam unit to constitute multiple beam forming network, wherein, N is used for up direction, N is used for down direction in addition, in N wave beam unit of uplink and downlink direction, cover full sub-district as public wave beam with a wave beam unit respectively, all the other N-1 wave beam of up link and down link, the part of each each coverage sector of wave beam, but it is combined can cover full sub-district, and the public wave beam of neighbor cell is provided with the district of overlapping;
Under the multiple beam forming network tissue, beam diversity by the sub-district reverse link receives and the STTD coding beam transmission diversity of forward link is finished the physical layer function of WCDMA sub-district notion: the reception of up common beam realization common channel, up diversity-wave is realized the diversity reception of special use or partial common channel, descending public wave beam is realized the emission of common channel, and descending diversity-wave is realized the STTD coded diversity emission of special use or partial common channel.
2. according to the described wide-band CDMA base station physical layer implementation method of claim 1 based on multi-beam antenna, it is characterized in that, in the described Common transport channel that must in full sub-district, broadcast or receive by public beams carry, P-CPICH, PICH, AICH, SCH etc. in the BCH of WCDMA system, PCH transmission channel and the physical channel launch in the intrafascicular downlink wave beam of public wave, receive in the uplink beam of RACH channel in common beam.
3. according to the described wide-band CDMA base station physical layer implementation method of claim 1 based on multi-beam antenna, it is characterized in that, in the described Common transport channel and dedicated channel that can in the segment space of sub-district, receive and launch, comprise FACH, DCH, S_CPICH and the reverse DCH channel of forward direction by the diversity-wave carrying.
4. according to the described wide-band CDMA base station physical layer implementation method of claim 1 based on multi-beam antenna, it is characterized in that, in the described Common transport channel and dedicated channel that can in the segment space of sub-district, receive and launch by diversity-wave carrying, comprise that direction difference, beam diversity according to link receive different with the mode of emission, definite or the reverse link in the sub-district carries out beam diversity and receives, and perhaps the forward link in the sub-district carries out STTD coding beam transmission diversity.
5. according to the described wide-band CDMA base station physical layer implementation method of claim 4 based on multi-beam antenna, it is characterized in that, when the reverse link in the sub-district carries out the beam diversity reception, the signal of cell uplink is done angle diversity by up diversity-wave and is received, diversity-wave is the part multipath signal of receiving mobile up link respectively, the diversity-wave output signal merges improving the base station antijamming capability according to the RAKE method of reseptance, and the upward signal that is in the travelling carriage under the soft changing state carries out diversity reception by the diversity-wave of the sub-district in the soft handover area.
6. according to the described wide-band CDMA base station physical layer implementation method of claim 4 based on multi-beam antenna, it is characterized in that, when the forward link in the sub-district carries out STTD coding beam transmission diversity, down link signal is done STTD Space Time Coding beam transmission diversity by the descending diversity-wave in the sub-district, substitute in the 3GPP agreement and do the emission of STTD Space Time Coding diversity by two slave antennas, constitute the Space Time Coding transmit diversity in the wave beam, wherein the required auxiliary Common Pilot Channel of STTD decoding is launched in corresponding diversity-wave, and promptly the special-purpose Space Time Coding of emission will be complementary with the auxiliary public guide frequency that is used for channel estimating of the coding wireless path that passes through in the wave beam.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1235391A (en) * | 1999-04-19 | 1999-11-17 | 董捷 | Self adaptable array antenna for pre-optimized shape beam for code division multi-access system |
| CN1278971A (en) * | 1997-09-15 | 2001-01-03 | 自动电信公司 | Practical space-time radio method for cdma communication capacity enhancement |
| EP1070367A2 (en) * | 1998-04-06 | 2001-01-24 | Ericsson Inc. | Multi-beam transmit array with low intermodulation |
| WO2001017131A1 (en) * | 1999-09-01 | 2001-03-08 | Qualcomm Incorporated | Method and apparatus for beamforming in a wireless communication system |
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2001
- 2001-05-03 CN CNB011128429A patent/CN100388654C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278971A (en) * | 1997-09-15 | 2001-01-03 | 自动电信公司 | Practical space-time radio method for cdma communication capacity enhancement |
| EP1070367A2 (en) * | 1998-04-06 | 2001-01-24 | Ericsson Inc. | Multi-beam transmit array with low intermodulation |
| CN1235391A (en) * | 1999-04-19 | 1999-11-17 | 董捷 | Self adaptable array antenna for pre-optimized shape beam for code division multi-access system |
| WO2001017131A1 (en) * | 1999-09-01 | 2001-03-08 | Qualcomm Incorporated | Method and apparatus for beamforming in a wireless communication system |
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| CN1384625A (en) | 2002-12-11 |
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