WO2008057014A1 - Commande de retard à l'aide d'une diversité de transmission - Google Patents

Commande de retard à l'aide d'une diversité de transmission Download PDF

Info

Publication number
WO2008057014A1
WO2008057014A1 PCT/SE2006/001271 SE2006001271W WO2008057014A1 WO 2008057014 A1 WO2008057014 A1 WO 2008057014A1 SE 2006001271 W SE2006001271 W SE 2006001271W WO 2008057014 A1 WO2008057014 A1 WO 2008057014A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
delay
signals
transmission paths
transmission
Prior art date
Application number
PCT/SE2006/001271
Other languages
English (en)
Inventor
Dan Anders Lindqvist
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to PCT/SE2006/001271 priority Critical patent/WO2008057014A1/fr
Publication of WO2008057014A1 publication Critical patent/WO2008057014A1/fr

Links

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
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/10—Monitoring; Testing of transmitters
    • H04B17/11—Monitoring; Testing of transmitters for calibration
    • H04B17/14—Monitoring; Testing of transmitters for calibration of the whole transmission and reception path, e.g. self-test loop-back

Definitions

  • the present invention is related to wireless communication systems using transmission diversity.
  • Transmission diversity basically entails sending the same signal over two or more antennas (usually two), where the antennas are spaced apart from each other. Diversity may be achieved in the frequency-, angle-, time- and space domains or in two or more domains simultaneously. For example, transmission diversity in the time domain may be achieved by sending a signal from a first antenna and thereafter sending the same signal from a second antenna with a predefined time delay. As another example, transmission diversity in the space domain is achieved by spacing apart the antennas from which the same signal is to be transmitted a certain length which may correspond to a fraction of the wavelength of the signal to be transmitted.
  • wireless communication systems such as third generation wireless communication systems, of which the UMTS (Universal Mobile Telecommunication Service) is one example, both space and time transmission diversity methods are used.
  • UMTS Universal Mobile Telecommunication Service
  • the required minimum delay is determined by calibration or calculation of the delay through the entire transmit chain, i.e. from the Radio Base Station (RBS) all the way to the antenna system.
  • RBS Radio Base Station
  • Time calibration for the signal may be carried out using several methods, such as by means of separate calibration equipment or calibration systems incorporated into the RBS.
  • the delay in each transmit chain may be calibrated for a minimum time difference of 30-60 ns.
  • the time delay for the first transmission chain is t1
  • the above delay values are example values and may differ from one application field to another. However, in each such application field there is an optimum time difference for which there is a signal gain achieved and outside of which the signal is attenuated instead.
  • delay determination for an antenna system may vary over time due to temperature variation in components along the transmission line. Also the ageing of the signal generating component in the transmitter may alter the initial delay in one or both branches may affect the delay balance. The characteristics of the above diplex filter may also be altered due to ageing. Yet another aspect is that replacing one or several components in the antenna system or in the signal generation parts will need recalibration of the system and thus measurements which originally were correct, may be misleading.
  • the object of the invention is to overcome at least some of the issues with known technology described above.
  • a transceiver device for a wireless communication system comprising at least one first transmission path and at least one second transmission path, at least one of the transmission paths further comprising a transmission delay adjusting element, each of the at least one first and second transmission paths further comprising a transmitter for sending a signal to an antenna system, where the transceiver device is characterised in that it is further arranged to receive an error signal indicative of the time delay between the signals sent on the at least one first and second transmission paths and where the delay adjusting element is adapted to adjust the time delay for the signal on the at least one first transmission path based on the error signal received.
  • the transceiver device may further comprise a signal generator for generating a test signal in both of the at least one first and second transmission paths.
  • a test signal may for instance be a sine wave or some other suitable signal.
  • the transceiver device may comprise coupling elements for coupling the test signal into both of the at least one first and second transmission paths.
  • These coupling elements may, for example be switches for directing the test signal into both of the at least one first and second transmission paths
  • the coupling elements may be operated synchronously to direct the signal into the at least one first and second transmission path. This may be done at system start-up or some other appropriate time.
  • the signal generator may also be provided as external to the transceiver device described above.
  • the transceiver device may comprise a feedback loop for receiving the delay signal.
  • a device for receiving and transmitting electromagnetic signals in a wireless communication network where the device further comprises at least two transceivers for sending and receiving electromagnetic signals, the device being further arranged to receive signals on at least one first and second transmission path, characterised in that the device for receiving and transmitting electromagnetic signals further comprises a time difference meter for measuring a delay time being the arrival difference between the signals received on the at least one first and second transmission path.
  • the device may further comprise a signal amplifier for amplifying the signals received on the at least one first and second transmission path.
  • the signal amplifier may comprise the time difference meter.
  • the difference meter may equally be located externally in relation to the signal amplifier.
  • the signal amplifier described above may also comprise an interface for sending an error signal indicative of the measured delay between the signals received on the at least one first and second transmission paths to a control device.
  • an interface for sending an error signal indicative of the measured delay between the signals received on the at least one first and second transmission paths to a control device may also comprise an O&M- type (Operation & Maintenance) interface.
  • O&M- type Operaation & Maintenance
  • the error signal may also be sent directly sent to a control device without using the O&M-interface.
  • the signal amplifier may comprise a device for capturing a portion of the signals received on the at least one first and second transmission paths and for directing this portion to the time difference meter.
  • An advantage of the device for capturing a portion of the signals is that the time delay measurement for the two signals received may be performed on actual data signals with no disturbance to data traffic.
  • the signal amplifier may further comprise at least one filter for filtering out signals received on the at least one first and second transmission paths not used in the time difference meter.
  • One example where it would be advantageous to use such a filter is in so called co-located systems, such as for example a combination of a GSM- and a 3G- system. In this fashion, if one is interested in achieving optimum diversity for 3G-signals, the filters filter out disturbances from GSM signals corrupting time delay measurements for the two signals received.
  • the time difference meter may comprise an arrangement for receiving a portion of the signals received on the at least one first and second transmission paths.
  • a time difference meter may be a hybrid combiner for combining a received portion of the transmitted signals and for generating a relative error signal indicative of the delay between the received portions of the signals.
  • Using a hybrid combiner has the advantage of easily being able to determine magnitude of the phase delay between the two signals received when the signals are treated in the analog domain. Thus, in the case when both received signals are in phase, the hybrid combiner may output a "zero" level signal on one of its outputs.
  • phase detector may be digital or analogue.
  • the object of the invention is solved by a method for minimising the delay between signals sent on at least one first and second transmission path in a wireless communication system, where the method comprises the steps of:
  • the signal referred to in step a) of the method according to the present invention may be either a data signal or a test signal.
  • the above method steps may further comprise the steps of a1) generating the test signal a2) synchronously coupling the test signal into the at least one first and second transmission paths c1) determining the difference in arrival time between the test signals received on the at least one first and second transmission paths.
  • test signal would give a wider choice of signals suitable for delaying and for measuring the delay in arrival time, such as for example sine signals and other suitable signals.
  • signals suitable for delaying and for measuring the delay in arrival time such as for example sine signals and other suitable signals.
  • By inputting the signal synchronously into the at least one first and second transmission line would also give a much better control of the instant when the signal is launched.
  • the method may be further characterised in that the step of adjusting the transmission delay in at least one of the at least one first and second transmission paths is performed so as to minimise the error signal indicative of the difference in arrival times for the signals sent on the first and second transmission paths to a predefined value range.
  • the transmission delay according to experience may for example be located in the range of 10-90 ns, more preferably in the range of 20-80 ns and even more preferably in the range of 30-60 ns. It has been shown in certain fields of application that transmission delays in these ranges in certain application fields give a signal gain at a diversity receiver, while outside this range the signal gain achieved through transmission diversity decreases and even turns into signal loss.
  • the object of the invention is achieved by a telecommunication infrastructure comprising a transceiver for communication in a communication system comprising at least one first transmission path and at least one second transmission path, one of the transmission paths further comprising a delay adjusting element, each of the at least one first and second transmission paths further comprising a transmitter for sending a signal to an antenna system, the antenna system further comprising at least two antennas for sending and receiving of electromagnetic signals, the antenna system being further arranged to receive signals on the at least one first and second transmission paths, where the antenna system further comprises a time difference meter for measuring the delay in arrival time between the signals received on the at least one first and second transmission path and in that the wireless transceiver device is further arranged to receive an error signal from the device for receiving and transmitting electromagnetic signals, the error signal being indicative of the delay in arrival time between the signals sent on the at least one first and second transmission paths and where the delay adjusting element is adapted to adjust the delay for a signal on one or both of the at least one first and
  • Fig. 1 shows a schematical view of a Radio Base Station system and an antenna system according to known technology.
  • Fig. 2 shows another schematical view of a Radio Base Station and antenna system according to known technology.
  • Fig. 3 gives a schematical view of a Radio Base Station and antenna system according to the present invention.
  • Fig. 4 illustrates a principal diagram of a Dual Tower Mounted Amplifier (DTMA) according to one embodiment of the present invention.
  • DTMA Dual Tower Mounted Amplifier
  • Fig. 5 illustrates an embodiment of a Time Difference Meter according to the present invention.
  • Fig. 6 illustrates another embodiment of a Time Difference Meter according to the present invention.
  • Fig. 7 illustrates a flow chart of a method according to the present invention.
  • Fig. 1 shows schematically a view of a part of a wireless communication network 100 according to known technology consisting of a Radio Base Station (RBS) 110 and an antenna system 210.
  • RBS Radio Base Station
  • the RBS in Fig. 1 comprises baseband processing circuitry 112 for transforming an RF signal down to baseband, two transmitters 116 and 118 transmitting the same signal on two different transmission lines, where the first transmitter 116 receives a signal from the baseband processing circuitry 112 which is time adjusted
  • the transmission line, the delay adjustment circuit 114, the first transmitter 116 and the first feeder 212 will arrive at the first antenna 213 after a time ti depicted as reference number 216 in Fig. 1.
  • the same signal traveling from the base processing circuitry 112 the transmission line, the second transmitter 118 and the second feeder 214 will arrive at the second antenna 215 after a time t 2 depicted as reference number 218 in Fig. 1.
  • Fig. 2 illustrates a co-located antenna system according to known technology.
  • the antenna system 210 in Fig. 2 is equipped with diplex filters 222, 224 and Tower Mounted Amplifiers (TMAs) 242, 244.
  • TMAs Tower Mounted Amplifiers
  • the total delay chain for a signal to be transmitted may be divided into an internal delay 120 caused by delays in the RBS and an external delay 220 caused by the feeder lines 212, 214 and the two diplex filters 222 and 224.
  • Fig. 3 describes a part of a wireless communication system according to one embodiment of the present invention.
  • a test pattern generator 115 In order to be able to control the delay of the signal sent through the delay chain, a test pattern generator 115 generates a signal, which, for example may be a sine-shaped signal, and sends the signal into both transmission lines 122, 124, whereafter the signal is sent through the transmission line 122 with a delay adjustment circuit 114 and towards the first transmitter 116, whereas the same signal pattern is sent on the other transmission line 124 towards the second transmitter 118.
  • the test pattern generator 115 may produce any other test signal which is easy to generate.
  • the function of the delay adjustment circuit 114 is to delay the further transmission of the signal in order to achieve two identical but somewhat time-delayed signals in the two transmission lines.
  • Examples of delay adjustment circuits are PLL (Phase-Locked-Loop) and DLLs (Delay Locked Loop) circuits (not shown), but the delay may equally be achieved by more simple circuits, such as two inverters in series (not shown) where the delay is regulated by the variation of the control voltage to the inverters or in some other suitable way.
  • the delay circuit can also be also be implemented directly in the baseband processing parts 112 by adjusting the phase in one of the digital modulators.
  • the switches 113 and 117 shown in Fig. 3 are used to direct the signal produced by the test pattern generator 115 to the first and second transmission lines 122 and 124, respectively. Normally, when the test pattern generator 115 is switched on, both switches 113, 177 will be turned on in order to direct the test signal to the first and second transmission lines 122 and 124. However, the switches may also be turned on at any desired moment in time. Especially when using solid-state switches the turning on or off of the switches is easy to perform in a way known in the art. They may be operated synchronously or asynchronously, as preferred. In case they are turned on asynchronously it would however be advantageous if the time difference between turning on one switch and the other were well defined.
  • the antenna system 210 comprises a Dual Tower Mounted Amplifier (DTMA) 230 for amplifying the received antenna signal to be transmitted where the DTMA 230 also comprises a Time Difference Meter 290 for measuring the time difference between the test signal pattern launched on both feeder lines 212 and 214 as close as possible to the first and second antennas 213 and 215.
  • DTMA Dual Tower Mounted Amplifier
  • the measured delay is then sent via the feedback line 300 back to the RBS 110 and used to control the delay adjustment circuit 114 in the first branch of the RBS.
  • the Time Difference Meter 290 may be located anywhere along the transmission lines 212 and 214, it would be advantageous if it is located as close to the antennas 213, 215 as possible. In this fashion essentially all delays in the signal propagation path from the RBS 110 to the antennas 213 and 215 will be accounted for.
  • the TDM 290 may be located outside the DTMA 230 as preferred.
  • a schematical view of a DTMA 230 is presented. Its main function in known technology is to act as an amplifier and filter for signals received from the antennas 213 and 215 which are to be sent over the air interface (not shown) and signals received at the antennas 213 and 215 received via the air interface.
  • a test signal produced by the test pattern generator 115 in figure 3 will eventually arrive at the DTMA 230 via the first and second transmission lines 212 and 214, where one of the signals (in this case the signal on the first transmission line 212) will arrive time delayed in relation to the signal on the second transmission line 214.
  • Both signals pass through the duplex filters 240 and 241 (the delayed signal) and 243 and 242, where the uplink signals are separated from downlink signals,
  • the two filtered signals pass through the diplex filters 281 and 282 where the 3G signals are separated from 2G signals for the abovementioned reasons.
  • the couplers 271 and 272 a portion of both signals is extracted and directed to the TDM 250 in order to determine the delay in arrival time for the two signals.
  • any means for coupling a portion of the filtered signals may be used, such as 3dB-couplers, circulators or the like.
  • switches where the two signals are directed to the TDM 250 in their entirety. This may be used when a test signal is used to calculate the difference in arrival time for the two signals in the TDM 250.
  • couplers would provide for the use of the determination of arrival time delay for the two signals also in cases where a data signal is used instead of only a test signal.
  • the DTMA 230 is also used to amplify signals received via the air interface at the antennas 213 and 215, these signals are filtered by the duplex filters 240, 241 and 242,
  • a radio base station such as the RBS 110 illustrated in Fig. 1 for baseband processing.
  • the receiving branch of the RBS 110 in Fig. 1 however is not shown.
  • This process may be implemented according to a method illustrated by the flow chart in Fig. 4
  • the error signal is sent to an O&M (Operation & Maintenance) interface 260 which produces a control signal related to the error signal and forwards it via the feedback line 300 to the RBS 110.
  • O&M Operaation & Maintenance
  • the feedback line may be a completely separate feedback line or a control link for exchange of control signals between the antenna system 210 and the RBS 110.
  • the TDM (Time Difference Meter) 250 may be realized in several different ways of which two examples are given in Fig. 5 and Fig. 6 Fig. 5 shows a schematic illustration of a TDM 250 realized as a hybrid combiner.
  • the two signals illustrated as sine-like signals, arrive at the input ports 251 and 252 of the hybrid combiner 255.
  • the hybrid combiner 255 produces a sum signal at its output port 253 with essentially the double amplitude of the original signals at the input ports 251 and 252 if both signals are in phase.
  • the hybrid combiner 255 produces a difference signal, i.e.
  • an error signal which, in the case that both signals on the input ports 251 and 252 are in phase is essentially zero.
  • the error signal is non-zero, i.e. there is some delay in arrival time for the two signals this error signal is forwarded via the output port 254 to the O&M-interface 260 illustrated in Fig. 4 earlier.
  • the TDM 250 was realized exclusively by analog components.
  • the TDM 250 in Fig. 5 will produce only signals with positive sign, i.e. one may obtain the information on the magnitude of the delay between the signals on the input ports 251 and 252.
  • FIG. 6 Another example of a TDM 250 is given in Fig. 6
  • the hybrid combiner 255 from Fig. 5 is replaced by a pulse shaper 258 followed by a phase detector 259.
  • the error signal produced at the output 254 of the phase detector 259 will be a signed error signal.
  • the sign of the delay may be obtained.
  • the pulse shaper 258 may convert the sine signals received to digital signals and the phase detector 259 may also be either analog or digital, depending on the application desired.
  • the test pattern generator 115 is started and a test signal, such as a sine signal or some other easily produced test signal is generated.
  • a test signal such as a sine signal or some other easily produced test signal is generated.
  • the switches 113 and 117 are turned on synchronously in order to direct the generated test signal to the first and second transmission lines 122 and 124.
  • the further transmission of the test signal on the transmission line 122 is delayed in the delay adjustment circuit 114 before it is sent further to the transmitter 116, while the same test signal on the transmission line 124 is sent to the transmitter 118 without delay.
  • both signals are further transmitted on the transmission lines 212 and 214 to the antenna system 210.
  • a portion of the signals sent on transmission lines 212 and 214 is extracted in the DTMA (Dual Tower Mounted Amplifier) 230 and directed towards the TDM (Time Difference Meter) 250.
  • DTMA Dual Tower Mounted Amplifier
  • TDM Time Difference Meter
  • the delay in arrival time of the two signals is determined in the TDM 250 and an error signal is produced indicative of the delay.
  • the error signal is sent to an O&M-interface 260 which sends the signal via the feedback line 300 to the RBS 110.
  • the error signal received via the feedback line 300 is used to adjust the delay for the test signal in the first transmission line 113 in order to minimize the delay in arrival time detected by the TDM 250.
  • step 480 it is checked whether the delay in arrival time for the test signals received on the first and second transmission lines 212 and 214 and measured in the TDM 250 has been minimized to the required value interval. If the delay has been minimized, it is checked at step 490 whether it was the last branch of the RBS 110 where the delay in arrival time for the two test signals received on the transmission lines 212 and 214 has been minimized. In case it was not the last branch, the delay adjustment process jumps at step 5000 to the next branch of the RBS 110 where the whole procedure is repeated from step 400 again. If it was the last branch of the RBS 110 the delay adjustment process is terminated at 510.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un dispositif émetteur/récepteur (110),un dispositif (210) pour recevoir et émettre des signaux électromagnétiques dans un réseau de communication sans fil, un procédé pour réduire au minimum le retard entre les signaux envoyés sur au moins un premier et un second trajets de transmission dans un système de communication sans fil et une infrastructure de télécommunication sans fil (100), où le dispositif émetteur/récepteur (110) pour un système de communication sans fil (100) comporte au moins un premier trajet de transmission (212) et au moins un second trajet de transmission (214), où au moins l'un des trajets de transmission comporte en outre un élément (114) d'ajustement de retard de transmission, où chacun parmi les premier et second trajets de transmission (212, 214) comporte en outre un émetteur (116, 118) pour envoyer un signal à un système d'antenne, caractérisé par le fait que le dispositif émetteur/récepteur (110) est en outre agencé pour recevoir un signal d'erreur indicatif du retard dans le temps d'arrivée entre les signaux envoyés sur au moins un premier et un second trajets de transmission et où l'élément d'ajustement de retard est apte à ajuster le retard de temps pour un signal sur le premier trajet de transmission sur la base du signal d'erreur reçu.
PCT/SE2006/001271 2006-11-08 2006-11-08 Commande de retard à l'aide d'une diversité de transmission WO2008057014A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2006/001271 WO2008057014A1 (fr) 2006-11-08 2006-11-08 Commande de retard à l'aide d'une diversité de transmission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2006/001271 WO2008057014A1 (fr) 2006-11-08 2006-11-08 Commande de retard à l'aide d'une diversité de transmission

Publications (1)

Publication Number Publication Date
WO2008057014A1 true WO2008057014A1 (fr) 2008-05-15

Family

ID=39364749

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/001271 WO2008057014A1 (fr) 2006-11-08 2006-11-08 Commande de retard à l'aide d'une diversité de transmission

Country Status (1)

Country Link
WO (1) WO2008057014A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2493237A1 (fr) * 2009-10-22 2012-08-29 Huawei Technologies Co., Ltd. Emetteur et station de base, et procédé d'alignement de signaux d'émetteurs
WO2022066345A1 (fr) * 2020-09-25 2022-03-31 Qualcomm Incorporated Rapport d'ue relatif aux retards et aux phases à partir de multiples points de transmission-réception pour la pré-égalisation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1217779A1 (fr) * 2000-12-22 2002-06-26 Telefonaktiebolaget L M Ericsson (Publ) Contrôle du retard dans un système d'émetteurs radio numériques
EP1580904A1 (fr) * 2004-03-26 2005-09-28 Nec Corporation Méthode et appareil pour l'ajustement d'un retard, et station de base correspondante
WO2006004562A1 (fr) * 2004-06-30 2006-01-12 Ammar Yosef Soupape a levier avec flotteur reglable

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1217779A1 (fr) * 2000-12-22 2002-06-26 Telefonaktiebolaget L M Ericsson (Publ) Contrôle du retard dans un système d'émetteurs radio numériques
EP1580904A1 (fr) * 2004-03-26 2005-09-28 Nec Corporation Méthode et appareil pour l'ajustement d'un retard, et station de base correspondante
WO2006004562A1 (fr) * 2004-06-30 2006-01-12 Ammar Yosef Soupape a levier avec flotteur reglable

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2493237A1 (fr) * 2009-10-22 2012-08-29 Huawei Technologies Co., Ltd. Emetteur et station de base, et procédé d'alignement de signaux d'émetteurs
EP2493237A4 (fr) * 2009-10-22 2012-10-10 Huawei Tech Co Ltd Emetteur et station de base, et procédé d'alignement de signaux d'émetteurs
US8594592B2 (en) 2009-10-22 2013-11-26 Huawei Technologies Co., Ltd. Transmitter, base station device, and method for aligning signal output from transmitter
WO2022066345A1 (fr) * 2020-09-25 2022-03-31 Qualcomm Incorporated Rapport d'ue relatif aux retards et aux phases à partir de multiples points de transmission-réception pour la pré-égalisation
US11432230B2 (en) 2020-09-25 2022-08-30 Qualcomm Incorporated UE report of time delays and phases from multiple transmission-reception points for pre-equalization
US11792719B2 (en) 2020-09-25 2023-10-17 Qualcomm Incorporated UE report of time delays and phases from multiple transmission-reception points for pre-equalization

Similar Documents

Publication Publication Date Title
US8731005B2 (en) Absolute timing and Tx power calibration of the Tx path in a distributed system
EP2415186B1 (fr) Système radio et procédé de retransmission de signaux radio à étalonnage de puissance de signaux radio de transmission
KR101419925B1 (ko) 다중포트 네트워크를 관통하여 광대역 신호를 빔성형하는 방법 및 시스템
US7729727B2 (en) Aligning radio base station node transmission timing on multiple transmit paths
EP2577798B1 (fr) Réseau d'antennes actives et méthode de relais de signaux radio
CN105007091A (zh) 传收器以及补偿方法
JP2017535164A (ja) マルチキャリア送信機で使用するための相互変調ひずみキャンセラ
US8774196B2 (en) Active antenna array and method for relaying radio signals with synchronous digital data interface
US20110267976A1 (en) Wireless relay apparatus and wireless relay system
CN102624472A (zh) 一种实现有源天线多通道链路校准的方法及装置
US20080144543A1 (en) Time division duplex forward-to-reverse transition signal generator
JP5632844B2 (ja) 無線通信装置及び無線通信方法
JP4524147B2 (ja) 通信装置、キャリブレーション方法及びプログラム
US20230246727A1 (en) Transport cable redundancy in a distributed antenna system using digital transport
US20090286495A1 (en) Parallel amplifier architecture with feedback control based on reflected signal strength
US20220407556A1 (en) Systems and methods for multi-transceiver radio frequency signal processing systems
EP3192194B1 (fr) Procédé et appareil pour faciliter un étalonnage d'antenne et émetteur-récepteur
US6674324B1 (en) System and method for producing an amplified signal using plurality of amplitudes across spectrum
JP3673732B2 (ja) アレーアンテナ送信パターン校正方法
KR20160132166A (ko) 다중 경로 rf 송수신기의 교정 방법 및 이를 이용한 장치
WO2008057014A1 (fr) Commande de retard à l'aide d'une diversité de transmission
JP2000286629A (ja) 無線送信装置及び送信指向性調整方法
CN111313919B (zh) 一种多功能的接收机
KR20050100717A (ko) 무선 중계기 시스템
EP0957587B1 (fr) Procedé et circuit pour la réduction de surcharges dans un émetteur-récepteur à balayage

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 06812994

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 06812994

Country of ref document: EP

Kind code of ref document: A1