CN1205140A - Base station receiver and method for receiving signal - Google Patents
Base station receiver and method for receiving signal Download PDFInfo
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- CN1205140A CN1205140A CN 97191308 CN97191308A CN1205140A CN 1205140 A CN1205140 A CN 1205140A CN 97191308 CN97191308 CN 97191308 CN 97191308 A CN97191308 A CN 97191308A CN 1205140 A CN1205140 A CN 1205140A
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Abstract
The invention relates to a base station receiver and a method for receiving a signal in a base station receiver the service area of which is divided into sectors, the signal comprising multipath propagated signal components. To provide a preferred base station structure, the signal components received in each sector are converted in the method to an intermediate frequency and to digital form, the digitalized signal components are supplied by means of a sector-specific multiplexed bus to a plural number of correlation and spectrum assembling means, in which each signal component is demodulated and assembled to narrowband form, and the demodulated signal components are supplied by connecting means to a plural number of receiver-specific combining means, in which the signals obtained from the different sectors are combined and detected.
Description
The present invention is general relevant with spread spectrum data transmission, and specifically directly to go up the method for reseptance of transmitting signal relevant with base station receiver and reception and synthesizing multi-path.
The present invention specifically is used in and utilizes code division multiple access, in the cellular wireless system of CDMA.
CDMA is a multipath method based on spread spectrum, and has been used for cellular wireless system recently, and wherein FDMA and TDMA are used in the past.An example of known cdma system is exactly broadband cellular wireless standard EIA/TIA IS-95.
In a typical mobile phone environment, the signal between base station and travelling carriage is multipath propagation between transmitter and receiver normally.This multipath propagation mainly is that the reflection by the outer surface signal realizes.The signal of multipath propagation is because the feasible asynchronism(-nization) that arrives receiver of different propagation delays.In CDMA, multipath propagation is used for signal as diversity mode and receives.The extended code that adopts in the transmission is revised characteristic automatically and can the delay component different with other component be made a distinction.Because cdma receiver adopts the multiple-limb Rake receiver usually, wherein the signal component of propagating on each branch and the different paths is synchronous.A digital receiving element comprises a plurality of rake branch, and each branch is a receiver section of independently finishing synthetic and demodulation received signal component.In cdma receiver, the signal of digital receiver unit different piece is synthetic well, to obtain high-quality signal.
In cdma system, also can adopt so-called soft handover, wherein utilize the grand diversity travelling carriage just can be simultaneously and several base station communications.The quality that travelling carriage connects between transfer period keeps high level, makes the user note less than the interruption in connecting.Make progress (from the base station to the terminal equipment) at downlink side, two or more base stations send identical signal.Because identical frequency is adopted in these base stations, so terminal equipment receives the signaling from a more than transmitter at one time.From different rake branch, distinguish and come as postponing component from the signal of different base station.On uplink direction (from the terminal equipment to the base station), two or more base stations receive the same signal that is sent by terminal equipment.These signals first common point place on signal path is synthetic.This soft handover can be optimized the power adjustment, and it reduces network interference level, and has increased network capacity thus.
The CDMA performance that can measure by spectrum efficiency is further enhanced by sectorization.A microzonation is divided into the sector of desired size, and these sectors are by the directional antenna service.The interference with other interstation that travelling carriage produces can obviously reduce in base station receiver.Its basis is exactly on average, and the interference between different approach axis is evenly to divide, and its quantity can reduce by sectorization as previously discussed.Sectorization can realize on the both direction of transmission naturally.The capacity advantage of being brought by sectorization is directly proportional with the quantity of sector.
In the sub-district of a sectorization, also can adopt the soft handoff of specific so-called More Soft Handoff, wherein travelling carriage is by finishing switching from a sector to another sector with two sector communication at one time.Soft handover has improved quality of connection.
Because the capacity of CDMA is directly relevant with the sensitivity of receiver, so the advantage that any deversity scheme brought will improve the entire capacity of system.Except above-described soft handover, promptly grand diversity, other deversity scheme such as the room and time diversity, also can be used for and being connected of CDMA.
The present invention is specifically relevant with the base station receiver structure of optimizing the More Soft Handoff realization.The prior art relevant with this base station receiver structure described in the IEEE personal communication to some extent, and 1994, the third phase, P.28-34, and ' based on the reverse link performance of cellular system IS-95 ', the R.Padovani works, at this as a reference.
Fig. 1 shows a diversity receiver according to prior art, for example these three sectors of receiver service.In each sector, adopt antenna diversity, i.e. two reception antennas.Antenna 122,124 services first sector, and antenna 126,128 and 130,132 is served second and the 3rd sector respectively.Receiver comprises a plurality of radio frequency unit 100-110.Each antenna is connected with their radio frequency unit of intermediate frequency and digital form that signal transition is become.Digital sample is passed to digital receiver unit 114-118 by RX bus 120.This receiver also comprises the processor controls 112 of control other parts action.A user's signal passes to each receiver unit, this signal by different antennae or even optionally receive from different sectors, what at this moment be concerned about is soft handover.Bus 120 must be a multichannel like this, so that can be used for the corrected received unit from the sampling of different radio frequency unit.
Fig. 2 shows the structure according to the digital received unit 114 of a diversity receiver of prior art.Each unit comprises the desired sampling of reception and they is passed to the demultiplexer 200 of demodulator 202-206, the at the heel and desired signal component of demodulation of these demodulators.In demodulator, frequency spectrum is by being associated to synthesize frequency spectrum with received signal with extended code, thus the signals sampling speed rate of spread that will descend.The signal of Xing Chenging is subsequently by demodulation like this.For example in IS-95, the up link demodulation means a Walsh-Hadamard conversion, in this way the quadrature signaling that adopts is decoded, and, selects related the tightest signal with input signal that is.This unit also comprises searcher 208, and it is at the heel and search for preferential signal component.The output of demodulator is added on the synthesizer 210, and it combines the unlike signal component with good form.Synthetic signal also offers decoder 212.This unit also comprises the processor controls 214 of control other parts action.
In the method for prior art, a central issue is exactly how to realize bus 120.For example in the base station according to EIA/TIA IS-95, the sample frequency that adopts among the unit 100-110 can be chip-rate (1.2288M chip/S), promptly 4,9152 of four times or octuple extended code
*10
6Or 9.8304
*10
6Sampling/S.According to situation, the signal dynamics requirement, 4 or 8 sampling resolutions for example, total bit rate of each radio frequency unit is the poorest to 78.6432Mbps (sampling rates of 8 times 8 bit resolutions), preferably arrives 19.6608Mbps (sampling rates of 4 times 4 bit resolutions).These numerals must be multiplied by the quantity of the radio frequency unit 100-110 that is connected with bus 120.As a result, the realization of bus 120 is very expensive, and is that technology is desired.
One object of the present invention just provides the base station that can avoid problem in the prior art.This purpose just provides a base station that need not costliness, high power capacity bus like this.
Another object of the present invention just provides the method for employing diversity relevant with More Soft Handoff.
Advantage of the present invention is brought by a base station receiver of the present invention that is used for spread spectrum system, in whole system, the base station services field is divided into one or more sectors, this receiver comprises a plurality of radio frequency units of each sector, a plurality ofly be in harmonious proportion the frequency spectrum splitter by separating of being connected with radio frequency unit of bus, and a plurality ofly being all sectors public detection and decoder, described part is separated by connector and different sectors and is in harmonious proportion the frequency spectrum splitter and connects.
In addition, superiority of the present invention also can be brought by the method for spread spectrum system base station receiver received signal.Wherein, the base station services field is divided into one or more sectors, signal comprises the multi-path signal component, and in this method, the signal component that receives by one or more antennas is transformed into intermediate frequency and digital form in each sector, these digitized signal components are added to a plurality of separating by the specific multiple bus in sector and are in harmonious proportion on the frequency spectrum splitter, and wherein each signal component is by demodulation, and the form of synthetic arrowband.The signal component of demodulation is added on the specific synthesizer of a plurality of receivers by connector, and wherein signal component is synthetic and detected.
Method provided by the invention has several advantages.For mode of the present invention, in the base station, need not the high power capacity bus.When adopting several rake branch, the diversity gain that switches between the sector also can improve.
The structure optimization of receiver is relevant with the relation of performance with device complexity and price.Method of the present invention implements simpler than art methods, and performance is equally good, and better than in the past in some aspects.
In basic scheme provided by the invention, Rake partly is an independently unit, and it separates with the channel unit that is connected by connector.This connector can be realized better by cross-connect matrix or multiple bus.Because bus is positioned at after the rake branch here, so need not the bus of high power capacity.Sample rate on the bus can reduce a rate of spread in the solution of the present invention, promptly the data rate on the bus is lower than the speed of prior art scheme substantially.In scheme provided by the invention, the operation of high power capacity bus between a pair of radio frequency unit and rake branch of leading to channel unit from radio frequency part can be restricted, and in this, its capacity requirement is lower than former substantially.
Next the example shown in reference to the accompanying drawings is described in more detail the present invention, wherein
Fig. 1 shows 3 sector diversity receivers according to prior art,
Fig. 2 shows a detailed view according to the receiver unit structure of prior art,
Fig. 3 shows the sub-district of a sectorization,
Fig. 4 shows an example according to receiver structure of the present invention,
Fig. 5 shows the example of a Rake part-structure, and
Fig. 6 shows a synthetic and decoder example of structure.
We at first discuss the example of a sectorized cells shown in Figure 3.The figure shows and have the base station 300 that is divided into three sector 302-306 coverages, each sector is by their radio frequency unit service.We suppose that a subscriber equipment 308 is positioned at the zone of base station 300.Subscriber equipment in 302 zones, sector, but when it moves, can be near the edge of sector 302, and move to gradually in 306 zones, sector.When subscriber equipment when move another sector, it must switch between different sectors, such switching generally is called More Soft Handoff.
Fig. 4 is a calcspar that shows according to base station receiver structure of the present invention.The sub-district of 3 sectors shown in Figure 3 of the base station services shown in the figure.In each sector, adopt antenna diversity, i.e. two reception antennas.The receiver of Fig. 4 demonstration comprises six antennas like this.Antenna 122,124 services first sector, antenna 126,128 and 130,132 is served the second and the 3rd sector respectively.This receiver also comprises a plurality of radio frequency unit 100-110.Each antenna with one independently radio frequency unit be connected, it becomes intermediate frequency and digital form to signal transition.
In receiver provided by the invention, the radio frequency unit of each sector is connected with the frequency spectrum composite part with a plurality of sectors particular association by the RX bus.In first sector, radio frequency unit 100,102 is connected with frequency spectrum composite part 406-410 by bus 400, and in second sector, radio frequency unit 104,106 is connected with part 412-416 by bus 402.In addition, in the 3rd sector, radio frequency unit 108,110 is connected with part 418-422 by bus 404.Receiver comprises independently sector particular rake part like this, and in art methods, they are arranged to be connected with channel unit.Part 406-422 synthesizes in a sector.The structure of these parts can be discussed below.According to this method, each sector specific RX bus 400-404 goes up required maximum data rate and determines according to radio frequency unit number in each sector, generally be a pair of, so the data rate of bus can not change when the sector increases.
This receiver also comprises independently being the public synthetic and decoder 428-432 in these sectors, and the output 436-452 of part 406-422 is added to synthetic and decoder imports connector 424 on the 454-458.Should syntheticly be responsible for grand branch and assemble (wherein the signal that will synthesize is from a more than part, such as the switching in the sector), the detection of signal and decoding with decoder 428-432.Structure synthetic and decoder 428-432 can be discussed below in more detail.
Like this, in method provided by the invention, be signal that comprises the signal component of multipath propagation of base station receiver reception of received signal sectorization.In each sector 302-306, the signal component that one or more antennas receive among the radio frequency unit 100-110 changes into intermediate frequency and digital form.These digitized signal components are added to a plurality of separating by the specific multiplex bus 400-404 in sector and are in harmonious proportion on the frequency spectrum splitter 406-422, wherein each signal component demodulation and synthesize the arrowband form.
Restituted signal component 436-452 is added on the specific synthesizer 428-432 of a plurality of receivers by connector 424, and wherein signal component is synthetic and detected.
Let us studies the structure of frequency spectrum composite part 406 more meticulously with reference to calcspar shown in Figure 5 now.From the channel unit according to prior art, this part is included in the synthetic part of signal.The input of this part is the signal of a RX bus 400, and this signal comprises the output of the radio frequency unit of sector with multiplexed form.This part comprises demultiplexer 200, and it receives desired sampling and they are passed to demodulator 202-206, the signal component that these demodulators are at the heel and demodulation is desired.In demodulator, frequency spectrum is synthetic by received signal being associated with extended code come, thus the signals sampling speed rate of spread that can descend.He Cheng signal demodulation then.For example in the IS-95 system, the up link demodulator means that the quadrature signaling of employing decodes with Walsh-Hadamard conversion WHT, promptly selects the signal with the input signal tight association.WHT narrows down frequency band with 6: 64 ratio.The output of selected WHT, promptly association results also provides the quality information about six detecting positions.The IS-95 frequency spectrum is synthetic by obtaining a chip that is added on the WHT with received signal is related with four chips like this, and in WHT the association of 64 Walsh chips is obtained six detecting positions and synthesize.This unit also comprises searcher branch 208, and it is at the heel and seek preferential signal component in the received signal.This unit also comprises the controller 214 of control other parts action.Controller 214 is generally realized by a common signal processor.Control signal 427a is added on the controller 214 from the control unit of whole receiver.
Signal that given extended code takes advantage of and the intensity of measuring them are sought by a given time window by searcher branch 208 in received signal.When finding the component of being eager to excel than given threshold value, it notifies control unit 214, and in case of necessity, one among the order demodulation 202-206 of branch is removed to receive the component that is found.The output of demodulator 202-206 is added on the synthesizer 210 of preferential synthetic unlike signal component.Because importing 400 is signals from a sector radio frequency unit, synthetic signal 436 can include only the signal component from a sector.
Next we study the demonstration structure of synthetic and decoder 428 more meticulously with reference to the calcspar of Fig. 6.From the channel unit according to prior art, synthetic and decoder 428-432 comprises the synthetic and decoded portion of signal.Input synthetic like this and decoder 428 is a signal that obtains from connector 424, and this signal comprises the signal component that obtains and be derived from same transmitter from part 406-422.Each synthesizes signal of a user who receives from one or more sectors with decoder processes like this.The Rake part that adopts in each instantiation has effect to change according to which sector to moving.Signal at first is added on the synthesizer 600, and wherein the signal that obtains from different sectors is preferentially synthetic by being adopted as synthetic method known in the art.If signal is from same sector, syntheticly do not need naturally, because synthesizing in the Rake part in sector finished.It is synthetic that the information that also can calculate relevant each sector signals is optimized later signal.
Synthetic signal is added on the decoder 602, and wherein signal is decoded and detect by known detection method, and from then on signal 460 also further is added to the other parts of receiver.Synthetic and decoder 600-602 can realize by the known method that adopts signal or ordinary processor or discrete parts.
Although more than the present invention is described with reference to the example shown in the accompanying drawing,, be clear that the present invention is not limited to this concrete example, but adjust in can the inventive concept scope in claims.
Claims (9)
1. the base station receiver in spread spectrum system, wherein, the coverage of base station can be divided into one or more sectors, this receiver comprises a plurality of radio frequency units that are used for each sector, a plurality of relevant and frequency spectrum composite sets that connect by bus and radio frequency unit, and a plurality ofly being all sectors shared detection and decoding device, described device is connected with the frequency spectrum composite set with the relevant of different sectors by jockey.
2. the base station receiver in spread spectrum system, wherein, the coverage of base station can be divided into one or more sectors, and wherein, each sector is by one or more radio frequency unit services, these unit comprise that the signal transition that antenna is received becomes the device of intermediate frequency, sampling and intermediate frequency signal is transformed into the device of digital form, and wherein digitized signal is added on a plurality of sectors certain relevant and the frequency spectrum composite set from each unit by the specific multiplex bus in sector, and each is relevant to be connected with decoding device by the public detection in all sectors with a plurality of by jockey with the frequency spectrum composite set.
3. according to the base station receiver of claim 1 or 2, wherein jockey is realized by cross-connect matrix.
4. according to the base station receiver of claim 1 or 2, wherein jockey is realized by multiplex bus.
5. according to the base station receiver of claim 2, this receiver also comprise be used to the signal component that different sectors radio-frequency part branch received by jockey from same transmitter be directed to detect and decoding device on control device.
6. the method for base station receiver received signal in the spread spectrum system, wherein base station service areas is divided into one or more sectors, and this signal comprises the multi-path signal component, and the method comprising the steps of:
The signal component that in each sector one or more antennas is received converts intermediate frequency and digital form to;
By the specific multiplex bus in sector the digitized signal component is added on a plurality of relevant and frequency spectrum composite sets, wherein each signal component is by demodulation and be combined into the form of arrowband, and
By jockey the restituted signal component is added on the specific synthesizer of a plurality of receivers, wherein the signal component that obtains from different sectors is synthesized and detects.
7. according to the method for claim 6, wherein the restituted signal component is added on the specific synthesizer of a plurality of receivers by cross-connect matrix.
8. according to the method for claim 6, wherein the restituted signal component is added on the specific synthesizer of a plurality of receivers by multiplex bus.
9. according to the method for claim 6, wherein the specific synthesizer of each receiver is handled the signal component that receives from same transmitter.
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| CN 97191308 CN1205140A (en) | 1996-09-23 | 1997-09-22 | Base station receiver and method for receiving signal |
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| US08/717,724 | 1996-09-23 | ||
| CN 97191308 CN1205140A (en) | 1996-09-23 | 1997-09-22 | Base station receiver and method for receiving signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010135867A1 (en) * | 2009-05-27 | 2010-12-02 | 华为技术有限公司 | Spectrum detecting method, system and base station |
| CN101087168B (en) * | 2006-06-06 | 2011-03-16 | 中兴通讯股份有限公司 | Check method of base station section orientation in time division multi-address cellular communication system |
| US8265675B2 (en) | 2005-10-07 | 2012-09-11 | Nec Corporation | MIMO wireless communication system and method by a plurality of base stations and mobile station |
-
1997
- 1997-09-22 CN CN 97191308 patent/CN1205140A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8265675B2 (en) | 2005-10-07 | 2012-09-11 | Nec Corporation | MIMO wireless communication system and method by a plurality of base stations and mobile station |
| CN101283526B (en) * | 2005-10-07 | 2015-09-09 | 日本电气株式会社 | The mimo wireless communication system that travelling carriage and multiple base station use and method |
| CN101087168B (en) * | 2006-06-06 | 2011-03-16 | 中兴通讯股份有限公司 | Check method of base station section orientation in time division multi-address cellular communication system |
| WO2010135867A1 (en) * | 2009-05-27 | 2010-12-02 | 华为技术有限公司 | Spectrum detecting method, system and base station |
| CN102405677A (en) * | 2009-05-27 | 2012-04-04 | 华为技术有限公司 | Spectrum detecting method, system and base station |
| US8410771B2 (en) | 2009-05-27 | 2013-04-02 | Huawei Technologies Co., Ltd. | Method and apparatus for spectrum detection |
| CN102405677B (en) * | 2009-05-27 | 2014-10-08 | 华为技术有限公司 | Spectrum detecting method, system and base station |
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