CN1250561A - Transmission method and radio system - Google Patents
Transmission method and radio system Download PDFInfo
- Publication number
- CN1250561A CN1250561A CN 98803383 CN98803383A CN1250561A CN 1250561 A CN1250561 A CN 1250561A CN 98803383 CN98803383 CN 98803383 CN 98803383 A CN98803383 A CN 98803383A CN 1250561 A CN1250561 A CN 1250561A
- Authority
- CN
- China
- Prior art keywords
- signal
- receiver
- transmitter
- wireless system
- sends
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/10—Polarisation diversity; Directional diversity
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
- Bidirectional Digital Transmission (AREA)
- Radio Relay Systems (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention relates to a transmission method and a radio system comprising at least one transmitter (200) and one receiver (100) which employ TDD duplexing when setting up a connection. The transmitter (200) receives signals propagated on different signal paths by means of antennas (201). The radio system comprises transmission means (220) which receive a signal from several polarization directions, measuring means (210) which measure signals received by the transmitter (200), said signals being combined into one signal on the basis of the measurement. The transmission means (220) polarize the signal and transmit the polarized signal to the receiver (100) in several polarization directions on the basis of the measurement performed by the measuring means (210).
Description
Scope of invention
The present invention relates to wherein be received in the signal of propagating on the different signal paths with antenna comprising at least one transmitter and a receiver and when foundation interconnects, using the sending method of using in the wireless system of TDD duplex.
The description of prior art
In typical mobile phone environment, the signal between base station and the mobile subscriber is being propagated on several paths between the transmitter and receiver.Multipath transmisstion mainly is to be caused by the signal that circumferential surface reflects.Because different transmission delays, receiver receives the signal of propagating on different paths in the different time.Can use the multipath transmisstion signal to receive as diversity.In the receiver scheme, adopt the multi-branch receiver structure usually, wherein each branch road is synchronized on the signal component of propagating on the different paths.In receiver, the signal combination of different receivers is got up, that preferably be concerned with or incoherent.Mode with combination can produce high-quality signal.
Normally used method is Frequency Division Duplexing (FDD) (FDD) in wireless system, wherein sends and received signal at different frequency bands.If in wireless system, use the FDD method, be difficult to estimating down-ward link channel in advance in conjunction with distribution antenna.Because the downlink channel at the transmitter of FDD base station is unknown, the base station can not resemble and send down link signal best the receiving uplink signal.Certainly, problem just becomes particularly difficult when the down link business is heavier than uplink service.Above-mentioned situation for example takes place when browse WWW (World Wide Web) webpage.
The present invention's summary
Therefore the purpose of this invention is to provide a sending method, wherein send signal to receiver according to the signal that receives by transmitter.
Can realize this purpose with said sending method in the foreword, it is characterized in that, receive from the next signal of several polarised directions by transmitter, the signal that measurement is received by transmitter, according to the signal combination that measures receiving is a signal, by the measurement that the signal that receives is finished signal is sent to receiver on several polarised directions.
The invention still further relates to and comprise at least one transmitter and a receiver, use the wireless system of TDD duplex when connecting, described transmitter is received in the signal of propagating on the different signal paths with antenna.
Wireless system of the present invention is characterised in that, it comprises from the transmitting device of several polarised direction received signals, measurement is by the measuring equipment of the signal of transmitter reception, according to measuring signal combination is a signal, and wherein transmitting device sends to receiver according to the measurement polarized signal of being finished by measuring equipment and with the signal that polarizes on several polarised directions.
The present invention obtains several advantages.The present invention is particularly suitable for using the wireless system of TDD duplex.The invention enables and to shift to an earlier date estimating down-ward link and/or uplink channel.Method of the present invention is particularly well adapted for up link and the downlink side transfer of data that makes progress and requires different systems.In the wireless system of the present invention, in transmitter, have multipath parts and antenna concurrently.In addition, in transmitter, disturb between the elimination linear symbol.Intersymbol interference refers to the interference that is caused by cross-talk between the continuous symbol of propagating on the multipath channel.The above-mentioned the present invention of meaning can make the job requirement capacity bigger, and will handle from receiver and forward transmitter to.The present invention can also forward the part work of transmitter to receiver and go.The present invention can also send in different polarised directions to each, and if desired, they are by differently weighting.During transmission, according to the signal that receives from top polarised direction with the polarised direction weighting.Polarized signal in transmitter and receiver.Polarization can produce very different channels.
Brief description of drawings
Below with reference to more detailed explanation the present invention of example with reference to the accompanying drawings, wherein
Fig. 1 represents wireless system of the present invention,
Fig. 2 is illustrated in the block diagram of the transceiver that uses in the wireless system of the present invention.
Detailed description of the present invention
Fig. 1 represents a wireless system, comprises that it in fact for example is the user terminal 100 of mobile phone that a base station 200 reaches.The transceiver effect is played in user terminal 100 and base station 200.User terminal 100 comprises antenna 101, and base station 200 comprises several antennas 201.User terminal 100 also can comprise several antennas 101.In fact, antenna 101,201 plays transceiver antenna.
Fig. 2 is illustrated in the transceiver architecture figure that uses in the wireless system of the present invention.Transceiver comprises antenna 201, and in fact it play transceiver antenna.Transceiver also comprises radio-frequency unit 112,124, modulator 123, demodulator 113, and controll block 102.Other transceiver piece of controll block 102 typical control.Radio-frequency unit 112 is sent to intermediate frequency with the radiofrequency signal that antenna 201 provides.If comprise the CDMA signal, radio-frequency unit 112 is connected to broadband signal is reset on the demodulator 113 of narrowband data signal.But, the invention is not restricted to cdma system, for example, also can be TDMA, or the combination of described system.Transceiver also comprises encoder 122 and decoder 114.On data-signal is provided to decoder 114 with the suitable manner decoding data signal from demodulator 112.Being provided to the signal on the decoder 114, for example is convolution code.The computing of decoder 114 can be for example, based on viterbi algorithm.Decoder 114 typically decoded signal encryption and interweave.
Encoder 122 received signals also are sent to modulator 123 with encoded signals.During coding, encoder 122 for example uses convolutional encoding.Encoder 122 for example, also with signal encryption.Encoder 122 is gone back the bit or the bit group of interleaved signal.Then, the signal with convolutional encoding is provided on the modulator 123 that in fact plays the Symbol modulator effect.When transceiver was the CDMA type, the signal that receives from modulator 123 was the pseudo noise that is encoded to wideband spread-spectrum signal.Then, in radio-frequency unit 124, in known manner spread-spectrum signal is converted to radiofrequency signal.Radio-frequency unit 124 sends signal to wireless path through antenna 201.
Transceiver also comprises measuring equipment 210 and dispensing device 220.Measuring equipment 210 measures the signal that antenna 201 receives.Dispensing device 220 and measuring equipment 210 are operably connected mutually.Dispensing device 220 sends signal on the wireless path according to the metric data that obtains from measuring equipment 210.Measuring equipment 210 for example can be arranged in radio-frequency unit 112.In fact dispensing device 220 for example is arranged in radio-frequency unit 124.
When connecting, user terminal 100 sends signal to base station 200, and the base station for example routes to the PSTN network forward with the signal that receives.Wireless system uses TDD (time division duplex) method.In the TDD method, the identical frequency work of up link and down link direction to open timing separation.In transmitting, down link data can see the advantage of the TDD method of in the wireless system of explanation, using especially.
Wireless system also comprises measuring equipment 210 and dispensing device 220.Measuring equipment 210 and dispensing device 220 operationally combine with the base station in the scheme of figure.When base station 200 sent signal, signal travelled over to the base station in different paths at user terminal 100.The signal that sends is by the possible barrier reflection on the wireless path, so base station 200 receives multipath component.Time-delay and amplitude and phase change appear between multipath component.Changes in amplitude is to be caused by the multipath transmisstion that mainly depends on frequency of utilization.For example, the decline of adjacent channel can be very inequality.
The most handy distribution antenna 201 in base station receives multipath component.From antenna signal is offered measuring equipment 210, if desired, it is to signal weighting.The signal that different antenna 201 receiving features depart from mutually.Then, can be with different modes to signal weighting.Strong signal is added power usually than weak signal.After the weighting, the signal of measuring equipment 210 combined weighteds.Scheme measuring equipment 210 estimating uplink channels among the figure.Measuring equipment 210 for example, is delayed time amplitude and phase place from being measured the signal of user terminal 100 and base station 200 receptions.By making up, just received signal by the multipath component that several antenna branch or antenna receive.
When sending signal to user terminal 100, use the measurement that obtains from measuring equipment 210.Because up link and down link direction are used identical frequency, so can use measurement.Dispensing device 220 so sends signal makes user terminal 100 can preferably receive only a strong signal component with its antenna 101.Owing to the reason of pointing out above can simplified receiver 100 structure.The present invention can make the antenna line that is formed by the antenna that distributes together towards user terminal.
Also the part-structure of base station can be forwarded to user terminal and go, so the structural complexity step-down of base station.The part work of base station 200 can be forwarded to user terminal 100 and go, especially when meticulous interference eliminated is used in base station 200.Distribution antenna 201 measures according to channel and makes its line towards user terminal 100, makes the base station can receive optimum signal.User terminal 100 can comprise several antennas 101.User terminal 100 also can comprise dispensing device 220 and measure the measuring equipment 210 of downlink channel.User terminal 100 sends signal according to Downlink channel estimation to base station 200 under the above-mentioned situation.
Dispensing device 220 is regulated its transmitted power according to the measurement of being finished by measuring equipment 210.Transmitted power is regulated and to be caused reducing to the requirement of power adjustments signaling and cause less signaling mistake.If since the decline the channel between user terminal 100 and the base station 200 a little less than, also not necessarily need to improve transmitted power.Under the above-mentioned situation, the transmission of signal (for example frame) is under an embargo.Transmitted power raising De Taigao can cause the interference in the wireless system.Dispensing device 220 is also according to disturbing between the linear symbol of being eliminated the signal that sends by the signal of transmitter 200 receptions.Because interference eliminated, receiver 100 can receive high-quality signal.
In up link and downlink channel, use identical frequency to make the complexity of structure of receiver low.Transmitter can be the Pre-RAKE type.The Pre-RAKE transmitter can be according to channel estimating combination multipath component and the aerial signal done by receiver.In addition, can promptly finish the structure that the elimination of disturbing between linear symbol comes simplified receiver in this way at transmitter.
Therefore can improve the performance of down link with method of the present invention.Method is particularly suitable for being used in fixed telephone network to the system that user's last connecting line is replaced by wireless network, in other words in so-called WLL (wireless local loop) uses.User terminal 100 is stably or microinching in WLL uses.The WLL technology allows to use SDMA (space division multiple access) technology.Distinguish the user with the position in the SDMA technology.According to mobile subscriber's position the receiver antenna line is adjusted to the direction of wanting in the base station and realizes this point.For this reason, in wireless system, use adaptive antenna array, in other words use phased antenna.In addition, handle the signal of reception by this way, make the mobile subscriber to be monitored.
Though top reference example has with reference to the accompanying drawings illustrated the present invention, be appreciated that to the invention is not restricted to these, but can in the thought range of the invention that the accompanying Claim book illustrates, revise in many ways.
Claims (25)
1, comprising at least one transmitter (200) and a receiver (100), when foundation is connected to each other, using the sending method of using in the wireless system of TDD duplex, wherein be received in the signal that different signal paths is propagated, it is characterized in that by antenna
Receive from the next signal of several polarised directions by transmitter (200),
The signal that measurement is received by transmitter (200),
According to measuring the signal combination that receives is got up forming a signal,
By the measurement that the signal that receives is carried out signal is sent to receiver (100) in several polarised directions.
2, the method for claim 1 is characterized in that, sends signal by distribution antenna (201) capacity of the signal of receiver (100) reception is increased.
3, the method for claim 1 is characterized in that this method use distribution antenna (201), makes its beam direction towards receiver according to measurement.
4, the method for claim 1 is characterized in that, according to measuring the connection of estimating between transmitter (200) and the receiver (100), the estimated result that uses when this estimation provides to send signal to receiver (100).
5, the method for claim 1 is characterized in that, according to the transmitted power of the Signal Regulation transmitter (200) that receives, described adjusting reduces the power adjustments signaling.
6, the method for claim 1 is characterized in that, eliminates linear disturbance so that improve the quality of signals that is received by receiver (100) from the signal that is received by different signal paths.
7, the method for claim 1 is characterized in that, transmitter (100) sends signal according to the signal that its receives, when this signal propagates into receiver on a signal path, at receiver by coherent combination.
8, the method for claim 1 is characterized in that, transmitter (200) so sends signal according to the signal that it receives, and makes the signal that sends arrive receiver (100) combination soon before.
9, the method for claim 1 is characterized in that, is stably or uses this method during receiver (100) microinching when receiver (100) especially.
10, the method for claim 1 is characterized in that, uses this method in the cellular wireless system of realizing with the SDMA technology.
11, the method for claim 1 is characterized in that, uses the method according to described measurement weighted signal before sending to send signal at least two polarised directions.
12, the method for claim 1 is characterized in that, when the signal that receives comprised polarization components, with each polarization components weighting, the polarization components with weighting combined then.
13, one comprises at least one transmitter (200) and a receiver (100), when connecting, use the wireless system of TDD duplex, described transmitter (200) is received in the signal of propagating on the different signal paths with antenna (201), it is characterized in that wireless system comprises
From the dispensing device (220) of several polarised direction received signals,
Measurement is a signal by the measuring equipment (210) of the signal of transmitter (200) reception according to measuring described signal combination, and wherein
Dispensing device (220) sends to receiver (100) according to the measurement polarized signal of being finished by measuring equipment (210) and with the signal that polarizes on several polarised directions.
14, the wireless system of claim 13 is characterized in that, dispensing device (220) sends signal with distribution antenna (201), according to the signal that measures by measuring equipment (210), with the beam direction of antenna towards receiver (100).
15, the wireless system of claim 13 is characterized in that, measuring equipment (210) is estimated to be connected on the direction of receiver (100) and transmitter (200).
16, the wireless system of claim 13 is characterized in that, dispensing device (220) is according to its transmitted power of Signal Regulation that is received by transmitter (200), and this estimation makes can reduce the power adjustments signaling.
17, the wireless system of claim 13 is characterized in that, dispensing device is eliminated between linear symbol from the signal that sends according to the signal that is received by transmitter (200) and disturbed, and makes receiver (100) can receive the signal of optimizing.
18, the wireless system of claim 13 is characterized in that, dispensing device (220) so sends signal according to the signal that is received by transmitter (200), makes the signal that sends be combined soon before arriving receiver.
19, the wireless system of claim 13 is characterized in that, dispensing device (220) so sends signal, makes receiver (100) can coherently receive the signal of transmission.
20, the wireless system of claim 13 is characterized in that, transmitter (200) is the base station, and receiver (100) is a user terminal.
21, the wireless system of claim 13 is characterized in that, transmitter (200) is a user terminal, and receiver (100) is the base station.
22, the wireless system of claim 13 is characterized in that, wireless system is the cellular wireless system of realizing with the SDMA technology.
23, the wireless system of claim 13 is characterized in that, dispensing device (220) polarized signal and with the polarization signal at least two polarised directions, send.
24, the wireless system of claim 13 is characterized in that, dispensing device (220) polarization branch road polarized signal, and according to the signal weighting polarization branch road that measures by measuring equipment (210).
25, the wireless system of claim 13 is characterized in that, when measuring equipment (210) measurement comprises the signal of polarization components, and each polarization components of measuring equipment (210) weighting, so the polarization components of measuring equipment (210) combined weighted.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI971120A FI103445B1 (en) | 1997-03-17 | 1997-03-17 | Transmission method and radio system |
| FI971120 | 1997-03-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1250561A true CN1250561A (en) | 2000-04-12 |
Family
ID=8548411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98803383 Pending CN1250561A (en) | 1997-03-17 | 1998-03-13 | Transmission method and radio system |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0968575A2 (en) |
| JP (1) | JP2001516535A (en) |
| CN (1) | CN1250561A (en) |
| AU (1) | AU731614B2 (en) |
| FI (1) | FI103445B1 (en) |
| NO (1) | NO994495L (en) |
| WO (1) | WO1998042085A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835417B (en) * | 2005-03-14 | 2010-09-08 | 株式会社日立国际电气 | Wireless system |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI20012474A0 (en) | 2001-12-14 | 2001-12-14 | Nokia Corp | The transmission reception method in the radio system and the radio system |
| WO2015068284A1 (en) * | 2013-11-08 | 2015-05-14 | 株式会社日立製作所 | Wireless communication system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5021796A (en) * | 1971-01-15 | 1991-06-04 | The United States Of America As Represented By The Secretary Of The Navy | Broad band, polarization diversity monopulse antenna |
| DE4013562C2 (en) * | 1990-04-27 | 1994-11-24 | Ant Nachrichtentech | Diversity reception arrangement |
| US5548583A (en) * | 1992-11-24 | 1996-08-20 | Stanford Telecommuncations, Inc. | Wireless telephone user location capability for enhanced 911 application |
| GB2310109B (en) * | 1996-02-08 | 2000-07-05 | Orange Personal Comm Serv Ltd | Antenna arrangement |
| US6122260A (en) * | 1996-12-16 | 2000-09-19 | Civil Telecommunications, Inc. | Smart antenna CDMA wireless communication system |
-
1997
- 1997-03-17 FI FI971120A patent/FI103445B1/en active
-
1998
- 1998-03-13 JP JP54016898A patent/JP2001516535A/en active Pending
- 1998-03-13 AU AU64029/98A patent/AU731614B2/en not_active Ceased
- 1998-03-13 CN CN 98803383 patent/CN1250561A/en active Pending
- 1998-03-13 WO PCT/FI1998/000226 patent/WO1998042085A2/en not_active Application Discontinuation
- 1998-03-13 EP EP98909525A patent/EP0968575A2/en not_active Withdrawn
-
1999
- 1999-09-16 NO NO994495A patent/NO994495L/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1835417B (en) * | 2005-03-14 | 2010-09-08 | 株式会社日立国际电气 | Wireless system |
Also Published As
| Publication number | Publication date |
|---|---|
| AU6402998A (en) | 1998-10-12 |
| NO994495D0 (en) | 1999-09-16 |
| NO994495L (en) | 1999-09-16 |
| EP0968575A2 (en) | 2000-01-05 |
| FI103445B (en) | 1999-06-30 |
| AU731614B2 (en) | 2001-04-05 |
| JP2001516535A (en) | 2001-09-25 |
| WO1998042085A2 (en) | 1998-09-24 |
| FI971120A0 (en) | 1997-03-17 |
| FI971120A (en) | 1998-09-18 |
| FI103445B1 (en) | 1999-06-30 |
| WO1998042085A3 (en) | 1998-12-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3803218B2 (en) | Mobile communication base station and mobile station | |
| US6173014B1 (en) | Method of and apparatus for interference rejection combining and downlink beamforming in a cellular radio communications system | |
| KR100547748B1 (en) | System and Method for Improving the Performance of Adaptive Antenna Array in Moving Objects | |
| US6728307B1 (en) | Adaptive antenna transmit array with reduced CDMA pilot channel set | |
| JP3527056B2 (en) | Method and apparatus for high-speed data transmission in a narrowband mobile radio channel | |
| CA2202829C (en) | Devices for transmitter path weights and methods therefor | |
| JP3633872B2 (en) | Combination of channel coding and spatial block coding in multi-antenna structures | |
| US8040970B2 (en) | Method and apparatus for adaptive reduced overhead transmit beamforming for wireless communication systems | |
| US6934320B2 (en) | Orthogonalized spatial multiplexing for wireless communication | |
| US6839379B1 (en) | Adaptive DS-CDMA multi-user receiver with diversity combining for interference cancellation | |
| US7782972B2 (en) | Apparatus and method for selecting antennas in MIMO multi-carrier system | |
| WO2003085857A1 (en) | Method for selecting switched orthogonal beams for downlink diversity transmission | |
| CN1262001A (en) | Interpretation of a received signal | |
| KR100943610B1 (en) | Apparatus and method for feedbacking antenna shuffling information in a multiple-input multiple-output system using a multiple space time block coding technique | |
| EP1284051A2 (en) | Time-reversal block transmit diversity system for channels with intersymbol interference and method | |
| EP1266463A1 (en) | Transmit diversity method and system | |
| Winters | Signal acquisition and tracking with adaptive arrays in wireless systems | |
| CA2455111A1 (en) | Reception diversity combiner with selectable inversion and variable gain | |
| CN1135736C (en) | Transmission method and radio system | |
| CN100557988C (en) | Reduce the wireless communication system of frequency repeat utilization ratio | |
| CN1250561A (en) | Transmission method and radio system | |
| JP2005507224A (en) | System and method for reducing signal fading in wireless receiver | |
| JPH03239019A (en) | Diversity circuit in one-frequency alternate communication system | |
| Kaiser | Effects of channel estimation errors on spatial pre-coding schemes with phase flipping | |
| KR20050075650A (en) | Method and system for complex transmit diversity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |