WO2013167623A1 - Mécanisme amélioré de pilote précodé pour mimo 4tx - Google Patents

Mécanisme amélioré de pilote précodé pour mimo 4tx Download PDF

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Publication number
WO2013167623A1
WO2013167623A1 PCT/EP2013/059537 EP2013059537W WO2013167623A1 WO 2013167623 A1 WO2013167623 A1 WO 2013167623A1 EP 2013059537 W EP2013059537 W EP 2013059537W WO 2013167623 A1 WO2013167623 A1 WO 2013167623A1
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WO
WIPO (PCT)
Prior art keywords
pilot signals
data streams
dedicated
common
dedicated pilot
Prior art date
Application number
PCT/EP2013/059537
Other languages
English (en)
Inventor
Matthias HESSE
Michal PANEK
Krystian Pawlak
Original Assignee
Nokia Siemens Networks Oy
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 Nokia Siemens Networks Oy filed Critical Nokia Siemens Networks Oy
Publication of WO2013167623A1 publication Critical patent/WO2013167623A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0204—Channel estimation of multiple channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • 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
    • H04B7/0615—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 weighted versions of same signal
    • H04B7/0619—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 weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/063—Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
    • 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
    • H04B7/0615—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 weighted versions of same signal
    • H04B7/0619—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 weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • 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
    • H04B7/0684—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 using different training sequences per antenna
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space

Definitions

  • the present invention relates to apparatuses, methods and a computer program product for realizing an enhanced precoded pilot scheme, in particular for 4TX MIMO.
  • Embodiments of the present invention relate to channel estimation.
  • Channel estimation is performed in order to demodulate a received modulated signal.
  • non-MIMO and 2x2 MIMO Multiple Input Multiple Output
  • the channel estimation is based on known common pilot signals broadcasted from the base station.
  • different pilot schemes are under discussion in 3GPP for the standardization of 4Tx (4 branch) MIMO in HSDPA.
  • One option is so-called dedicated pilots or precoded pilots (precoded together with data streams). It seems that 3GPP slightly tends towards this solution. However, many aspects of dedicated pilots are still unclear.
  • the channel estimation is based on known dedicated pilot signals, one pilot signal per data stream.
  • the demodulation is thus on the dedicated level.
  • the number of data streams can go from 1 to 4.
  • the rank does not change the number of transmit antennas. For example, with MIMO rank 1 (single data stream), there would still be 4 transmit antennas.
  • For channel estimation on the physical level one always needs 4 pilots.
  • For channel estimation on the dedicated level one needs as many dedicated pilots as there are data streams. For example, with rank 3 there would be 3 different dedicated pilot signals needed.
  • dedicated pilots are transmitted together with each data stream.
  • the transmission of 4 parallel streams (rank 4 transmission) requires 4 dedicated pilots.
  • Each of those pilots requires a certain amount of power by which the data power has to be reduced.
  • Embodiments of the present invention address this situation and aim to reduce overhead and power for transmitting pilot signals.
  • an apparatus which comprises an interface unit configured to provide connection to a network, and a processor configured to transmit a plurality of data streams via the interface unit, to transmit at least one common pilot signal and at least one dedicated pilot signal with the plurality of data streams, and to set the number of dedicated pilot signals depending on the number of data streams.
  • the first aspect may be modified as follows:
  • the processor may be configured to determine the number of dedicated pilot signals such that, when the number of data streams is higher than one, the sum of the number of common pilot signals and the number of dedicated pilot signals is equal to the number of common transmission channels.
  • the processor may be configured to determine the number of dedicated pilot signals such that, when the number of data streams is two to four, the number of common pilot signals is two and the number of the dedicated pilot signals is two, and/or, when the number of data streams is one, the number of the common pilot signals is two and the number of the dedicated pilot signals is one.
  • the processor may be configured is configured to transmit two dedicated pilot signals on two different common transmission channels.
  • the processor may be configured to vary a transmission power of at least one of the dedicated pilot signals, and, optionally, to vary the transmission power of the at least one dedicated pilot signal based on the number of data streams.
  • an apparatus which comprises an interface unit configured to provide connection to a network, and a processor configured to receive a plurality of data streams via the interface unit, wherein the data streams comprise at least one common pilot signal and at least one dedicated pilot signal, and to perform channel estimation based on the at least one common pilot signal and the at least one dedicated pilot signal.
  • the second aspect may be modified as follows:
  • the processor may be configured to select whether to perform the channel estimation on a physical level or on a dedicated level based on the number of the data streams.
  • the processor may be configured to perform the channel estimation on a physical level in case sum of the number of the data streams and the number of the common pilot signals is higher than the number of common transmission channels, and/or to perform the channel estimation on a physical level or on a dedicated level in case sum of the number of the data streams and the number of the common pilot signals is equal to the number of common transmission channels.
  • the number of common transmission channels may be four and the number of common pilot signals may be two, and the processor may be configured to perform channel estimation on a physical level in case the number of data streams is three or four by using the two common pilot signals and two dedicated pilot signals.
  • the processor may be configured to perform the channel estimation on a dedicated level based on one dedicated pilot signal or to perform the channel estimation based on two dedicated pilot signals on two different common transmission channels.
  • the processor may be configured to perform channel estimation on the physical level by using a channel impulse response synthesis for the common pilot signals and the dedicated pilot signals.
  • a method which comprises transmitting a plurality of data streams, and
  • the third aspect may be modified as follows:
  • the method may further comprise determining the number of dedicated pilot signals such that, when the number of data streams is higher than one, the sum of the number of common pilot signals and the number of dedicated pilot signals is equal to the number of common transmission channels.
  • the method may further comprise determining the number of dedicated pilot signals such that, when the number of data streams is two to four, the number of common pilot signals is two and the number of the dedicated pilot signals is two, and/or, when the number of data streams is one, the number of the common pilot signals is two and the number of the dedicated pilot signals is one.
  • the method may further comprise, when the number of data streams is one, transmitting two dedicated pilot signals on two different common transmission channels.
  • the method may further comprise varying a transmission power of at least one of the dedicated pilot signals, wherein, optionally, the transmission power of the at least one dedicated pilot signal may be varied based on the number of data streams.
  • a method is provided which comprises receiving a plurality of data streams, wherein the data streams comprise pilot signals, the pilot signals comprising at least one common pilot signal and at least one dedicated pilot signal, and
  • the fourth aspect may be modified as follows:
  • the method may further comprise selecting whether to perform the channel estimation on a physical level or on a dedicated level based on the number of the data streams.
  • the method may further comprise performing the channel estimation on a physical level in case sum of the number of the data streams and the number of the common pilot signals is higher than the number of common transmission channels, and/or performing the channel estimation on a physical level or on a dedicated level in case sum of the number of the data streams and the number of the common pilot signals is equal to the number of common transmission channels.
  • the number of common transmission channels may be four and the number of common pilot signals may be two, and the channel estimation may be performed on a physical level in case the number of data streams is three or four by using the two common pilot signals and two dedicated pilot signals.
  • the method may further comprise performing the channel estimation on a dedicated level based on one dedicated pilot signal, or performing the channel estimation based on two dedicated pilot signals on two different common transmission channels.
  • the method may further comprise performing channel estimation on the physical level by using a channel impulse response synthesis for the common pilot signals and the dedicated pilot signals.
  • a computer program product which comprises code means for performing a method according to the third or fourth aspect or their modifications when run on a processing means or module.
  • the computer program product may be embodied on a computer-readable medium.
  • the number of dedicated pilot signals, which have to be provided in each data stream can be reduced. Using less pilots reduces the overhead and allows for an increased power allocation to the data channel and consequently increases the performance.
  • Fig. 1 shows a basic structure of a base station according to an embodiment of the present invention
  • Fig. 2 shows a basic operation of a base station according to an embodiment of the present invention
  • Fig. 3 shows a basic structure of a UE according to an embodiment of the present invention
  • Fig. 4 shows a basic operation of a UE according to an embodiment of the present invention
  • Fig. 5 illustrates a prior art solution with respect to an example for rank 4,
  • Fig. 6 illustrates a solution according to an embodiment of the present invention with respect to an example for rank 4.
  • Pilots for channel sounding which have to be continuously transmitted to enable a reliable and permanent feedback of CQI/PCI/RI.
  • Those pilots are: P-CPICH, S-CPICH and relatively low power common pilots on 3rd and 4th antenna. These pilots are examples for a common pilot signal, which is one pilot signal for all users.
  • Pilots for decoding which are just required by the UE receiving data e.g. dedicated pilots. These pilots are examples for a dedicated pilot signal, which is one pilot signal for each user.
  • Fig: 5 illustrates the currently discussed solution which uses dedicated pilots, as one solution for demodulation pilots.
  • Fig. 5 shows an example for rank 4 (i.e., four data streams), wherein for simplicity 3rd & 4th common pilots are not included in the figure.
  • the idea for this solution is to send the pilots together with the data stream. In this way, the number of pilots scales with the data rate. For rank 4 transmission four dedicated pilots are transmitted and the channel estimation for demodulation can be done only by this four pilots.
  • the primary and secondary CPICH have to keep their high power.
  • Fig. 1 shows a base station 1 as an example for an apparatus according to a more general embodiment of the present invention.
  • the apparatus may be a base station or may be only a part thereof, for example.
  • the base station 1 comprises a processor 1 1 and an interface unit 12.
  • the interface unit 12 is configured to provide connection to a network
  • the processor 1 1 is configured to transmit a plurality of data streams via the interface unit, to transmit at least one common pilot signal and at least one dedicated pilot signal with the plurality of data streams, and to set the number of dedicated pilot signals depending on the number of data streams.
  • the base station 1 may also comprise a memory 13 for storing data and programs, by means of which the processor 1 1 may carry out its corresponding functions.
  • the interface unit 12 may provide a connection to transmit antennas (not shown), or may itself include transmit antennas.
  • transmit antennas may be provided in order to realize 4TX MIMO.
  • the transmit antennas are examples for providing common transmission channels, so that in the example of 4TX MIMO, four common transmission channels are provided (i.e., each common transmission channel corresponds to one transmit antenna).
  • Fig. 2 illustrates a basic operation as carried out by the base station 1 of Fig. 1 , for example.
  • a plurality of data streams is transmitted, and at least one common pilot signal and at least one dedicated pilot signal are transmitted with the plurality of data streams.
  • the number of dedicated pilot signals is set depending on the number of data streams.
  • An example for setting the number of dedicated pilot signal is shown in steps S1 1 to S13.
  • step S1 1 it is checked whether the rank (as an example for the number of data streams) is 1 or 2 to 4. If it is 1 , then the number of dedicated pilot signal is set to one in step S12, if the rank is 2 to 4, then the number of dedicated pilot signals is set to two.
  • step S14 the data streams including the common and dedicated pilot signals are sent.
  • Fig. 3 shows a user equipment (UE) 2 as an example for another apparatus according to a more general embodiment of the present invention.
  • the apparatus may be a UE or may be only a part thereof, for example.
  • the UE 2 comprises a processor 21 and an interface unit 22.
  • the interface unit 22 is configured to provide connection to a network
  • the processor 21 is configured to receive a plurality of data streams via the interface unit 22, wherein the data streams comprise at least one common pilot signal and at least one dedicated pilot signal, and to perform channel estimation based on the at least one common pilot signal and the at least one dedicated pilot signal.
  • the UE 2 may also comprise a memory 13 for storing data and programs, by means of which the processor 21 may carry out its corresponding functions.
  • the interface unit 22 may provide a connection to antennas (not shown), or may itself include antennas.
  • Fig. 4 illustrates a basic operation as carried out by the U E 2 of Fig. 3, for example.
  • a plurality of data streams is received in step S21 , wherein the data streams comprise at least one common pilot signal and at least one dedicated pilot signal, and a channel estimation is performed based on the at least one common pilot signal and the at least one dedicated pilot signal.
  • the channel estimation can be performed on a dedicated level or a physical level.
  • Steps S22 to S24 illustrate an example how it can be decided based on the rank whether to perform channel estimation on the dedicated level or the physical level.
  • the rank is checked. In case the rank is 1 to 2, the channel estimation is performed on the dedicated level in step S23. In case the rank is 2 to 4, the channel estimation is performed on the physical level. That is, in case the rank is 2, both kinds of channel estimation are possible, so that it can be decided based on other criteria which kind of channel estimation (on the physical level or on the dedicated level) is to be performed. For example, such a decision could be based on the complexity of the kind of channel estimation, or could simply be pre-configured in the network configuration or configuration of the UE.
  • Figs. 2 and 4 relate to an example in which a transmission via four antennas (i.e., four common transmission channels) is performed.
  • the invention is not limited to these number examples.
  • the data streams may also be referred to as data layers.
  • the number of dedicated pilot signals can be limited, namely by using common pilot signals (such as CPICH) and the dedicated pilot signals in a mixed manner.
  • common pilot signals such as CPICH
  • a maximum of two dedicated pilot signals are necessary, when two common pilot signals are present anyway.
  • the number of used dedicated pilots (DPICH) signals for rank 3 and rank 4 transmissions is reduced. That is, instead of using only dedicated pilots for the channel estimation, the high power common pilots (P/S- CPICH) can be included and the maximum number of pilots can be reduced.
  • the UE can estimate the channel on a precoded level, i.e. including the precoder or on a physical level on which the common pilots are transmitted. The UE needs in any case as many pilots as it estimates channels. That means for the estimation of common transmission channels 4 different pilots are required. For the estimation of the precoded channels as many pilots are needed as streams are transmitted since the channel has to be estimated for each stream.
  • the new method dynamically switches between the two kinds of channel estimations depending on the rank of the transmission:
  • rank 1 the UE has to estimate the channel on the precoded data stream (layer) since there are not enough pilots for estimating all 4 common transmission channels. If rank 2 transmission is used (2 streams) the UE can choose which kind of channel estimation to use since 4 pilots are available, 2 on the physical level and 2 on the dedicated level.
  • the physical level is used for channel estimation since this requires only two dedicated pilots as for rank 2. 1 or 2 dedicated pilots can be saved compared the solution currently discussed in 3GPP where 3 or 4 dedicated pilots are used for rank 3 and 4, respectively. It is noted that the channel estimation on the physical level may be performed with channel impulse response synthesis for antenna 3 and 4 (antenna 1 and 2 CIRs are estimated by P/S-CPICH).
  • the dedicated pilots may be depending on the rank of the transmission and can be defined by the standard or be signalled by higher layers.
  • rank 1 an alternative for rank 1 is described. Namely, for rank 1 transmissions the reception and feedback estimation might be further improved with an alternative solution for rank 1.
  • the limited precoded/dedicated pilot quality could be further improved with channel impulse response synthesis based on primary DPICH, P-CPICH and S-CPICH, if another/second DPICH will be transmitted on one of the spatial streams different than Primary Spatial Stream.
  • the second DPICH in rank 1 transmission should have variable TX power configured by higher layer.
  • the DPICH2 TX power may vary between rank 1 and rank 2, 3, 4 transmissions.
  • the spatial stream precoding for secondary DPICH should be defined by standard or configured by the network.
  • 3rd and 4th common pilots could be switched off. Assuming there are 2 dedicated pilots, 2 common pilots and the knowledge about used precoding weights, all the channels (precoded and non-precoded) can be estimated and used both for demodulation and PCI/CQI/RI estimation.
  • Fig. 6 illustrates the proposed solutions for an example for rank 4. It is noted that for simplicity, 3th and 4th common pilots are not included in the drawing. Thus, if rank 1 transmission is used one dedicated pilot (DPICH1 ) is transmitted together with the data stream. If rank 2-4 is transmitted, 2 dedicated pilots (DPICH 1 and DPICH 2) are transmitted (as shown in Fig. 6).
  • the embodiments and the present invention in general is not limited to the specific examples given above.
  • the number examples for the dedicated and common pilot signals were given for the example of transmission with four antennas, i.e., that up to four data streams are possible.
  • the invention is not limited to these number examples. That is, also other numbers are possible, as long as it can be achieved that the sum of the common pilot signals and the number of the dedicated pilot signal is equal to the number of common transmission channels (antennas). In this way, there is a sufficient number of pilot signals for performing channel estimation on a physical level.
  • an apparatus and a method are provided by which a plurality of data streams are transmitted and at least one common pilot signal and at least one dedicated pilot signal are transmitted with the plurality of data streams, wherein the number of dedicated pilot signals is set depending on the number of data streams.
  • an apparatus and a method are provided by which a plurality of data streams is received, wherein the data streams comprise at least one common pilot signal and at least one dedicated pilot signal, and channel estimation is performed based on the at least one common pilot signal and the at least one dedicated pilot signal.
  • an apparatus which comprises
  • an apparatus which comprises
  • the means for receiving a plurality of data streams wherein the data streams comprise at least one common pilot signal and at least one dedicated pilot signal, and
  • an access technology via which signaling is transferred to and from a network element may be any technology by means of which a network element or sensor node can access another network element or node (e.g. via a base station or generally an access node).
  • Any present or future technology such as WLAN (Wireless Local Access Network), WiMAX (Worldwide Interoperability for Microwave Access), LTE, LTE-A, Bluetooth, Infrared, and the like may be used; although the above technologies are mostly wireless access technologies, e.g. in different radio spectra, access technology in the sense of the present invention implies also wired technologies, e.g. I P based access technologies like cable networks or fixed lines but also circuit switched access technologies; access technologies may be distinguishable in at least two categories or access domains such as packet switched and circuit switched, but the existence of more than two access domains does not impede the invention being applied thereto,
  • stations and transmission nodes may be or comprise any device, apparatus, unit or means by which a station, entity or other user equipment may connect to and/or utilize services offered by the access network; such services include, among others, data and/or (audio-) visual communication, data download etc.;
  • a user equipment or communication network element may be any device, apparatus, unit or means by which a system user or subscriber may experience services from an access network, such as a mobile phone or smart phone, a personal digital assistant PDA, or computer, or a device having a corresponding functionality, such as a modem chipset, a chip, a module etc., which can also be part of a UE or attached as a separate element to a UE, or the like;
  • any method step is suitable to be implemented as software or by hardware without changing the idea of the invention in terms of the functionality implemented;
  • CMOS Complementary MOS
  • BiMOS Bipolar MOS
  • BiCMOS Bipolar CMOS
  • ECL emitter Coupled Logic
  • TTL Transistor-Transistor Logic
  • FPGA Field-programmable Gate Arrays
  • CPLD Complex Programmable Logic Device
  • DSP Digital Signal Processor
  • - devices, units or means can be implemented as individual devices, units or means, but this does not exclude that they are implemented in a distributed fashion throughout the system, as long as the functionality of the device, unit or means is preserved;
  • an apparatus may be represented by a semiconductor chip, a chipset, or a (hardware) module comprising such chip or chipset; this, however, does not exclude the possibility that a functionality of an apparatus or module, instead of being hardware implemented, be implemented as software in a (software) module such as a computer program or a computer program product comprising executable software code portions for execution/being run on a processor;
  • a device may be regarded as an apparatus or as an assembly of more than one apparatus, whether functionally in cooperation with each other or functionally independently of each other but in a same device housing, for example.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un appareil et un procédé grâce auxquels une pluralité de flux de données sont émis et au moins un signal pilote commun et au moins un signal pilote dédié sont émis avec la pluralité de flux de données, le nombre des signaux pilotes dédiés étant fixé en fonction du nombre des flux de données. L'invention concerne en outre un appareil et un procédé grâce auxquels une pluralité de flux de données sont reçus, les flux de données comprenant au moins un signal pilote commun et au moins un signal pilote dédié et l'estimation de canal est effectuée en fonction dudit au moins un signal pilote commun et dudit au moins un signal pilote dédié.
PCT/EP2013/059537 2012-05-11 2013-05-07 Mécanisme amélioré de pilote précodé pour mimo 4tx WO2013167623A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EPPCT/EP2012/058842 2012-05-11
EP2012058842 2012-05-11

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Publication Number Publication Date
WO2013167623A1 true WO2013167623A1 (fr) 2013-11-14

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050047529A1 (en) * 2003-08-29 2005-03-03 Texas Instruments Incorporated Joint ration estimation and weights detection in closed loop transmit diversity
WO2007149722A1 (fr) * 2006-06-19 2007-12-27 Intel Corporation Signaux de référence destinés à la validation de faisceau de liaison descendante dans un canal mimo à multiporteuse sans fil
WO2010017628A1 (fr) * 2008-08-12 2010-02-18 Nortel Networks Limited Appareil et procédé pour permettre un relais transparent de liaison descendante dans un réseau de communication sans fil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050047529A1 (en) * 2003-08-29 2005-03-03 Texas Instruments Incorporated Joint ration estimation and weights detection in closed loop transmit diversity
WO2007149722A1 (fr) * 2006-06-19 2007-12-27 Intel Corporation Signaux de référence destinés à la validation de faisceau de liaison descendante dans un canal mimo à multiporteuse sans fil
WO2010017628A1 (fr) * 2008-08-12 2010-02-18 Nortel Networks Limited Appareil et procédé pour permettre un relais transparent de liaison descendante dans un réseau de communication sans fil

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