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WO2009048362A1 - Procédé et appareil d'émission de pilote par antenne supportant une transmission mimo multi-utilisateur - Google Patents

Procédé et appareil d'émission de pilote par antenne supportant une transmission mimo multi-utilisateur Download PDF

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Publication number
WO2009048362A1
WO2009048362A1 PCT/SE2007/050739 SE2007050739W WO2009048362A1 WO 2009048362 A1 WO2009048362 A1 WO 2009048362A1 SE 2007050739 W SE2007050739 W SE 2007050739W WO 2009048362 A1 WO2009048362 A1 WO 2009048362A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
antennas
wireless communication
communication terminal
per
Prior art date
Application number
PCT/SE2007/050739
Other languages
English (en)
Inventor
Magnus Olsson
Afif Osseiran
Original Assignee
Telefonaktiebolaget Lm 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 Lm Ericsson (Publ) filed Critical Telefonaktiebolaget Lm Ericsson (Publ)
Priority to PCT/SE2007/050739 priority Critical patent/WO2009048362A1/fr
Publication of WO2009048362A1 publication Critical patent/WO2009048362A1/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
    • H04B7/0697—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 spatial multiplexing
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • 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
    • 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
    • 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
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals

Definitions

  • the present invention generally relates to wireless communications, and particularly relates to a method and apparatus for per-antenna pilot transmission by a user terminal to facilitate Multi-User Multiple-lnput-Multiple-Output (MU-MIMO) transmissions by a supporting base station Background
  • MU-MIMO Multi-User Multiple-lnput-Multiple-Output
  • Multi-user (MU) Multiple-lnput-Multiple-Output (MIMO) precoding techniques yield extremely high spectral efficiency, at least under some circumstances These techniques represent an area of increasing interest in developing wireless communication standards targeting the IMT-Advanced requirements to be set by the International Telecommunication Union (ITU)
  • MU-MIMO precoding techniques include Successive Minimum Mean Square Error (SMMSE), such as taught in V Stankovic and M Haardt, "Multi-user MIMO Downlink Precoding for Users with Multiple Antennas," Proc of the 12th Meeting of the Wireless World Research Forum (WWRF), Toronto, ON, Canada, Nov 2004
  • Regularized Block Diagonalization represents another example of MU-MIMO precoding, such as taught in V Stankovic and M Haardt, "Novel Linear And Non-Linear Multi-User MIMO Downlink Precoding With Improved Diversity And Capacity," WWRF#16, April 2006
  • MU-MIMO precoding techniques involve the use of a precoding matrix to produce weighted information streams for transmission from different transmit antennas
  • the precoding weights must accurately reflect the channel conditions between respective pairings of transmit and receive antennas in order to eliminate or minimize multi-user interference
  • MU-MIMO precoding techniques depend on having accurate, timely channel state information (CSI) for use by the transmitter in precoding weight generation [0004] Consequently, there is particular interest in MU-MIMO precoding in low mobility scenarios, where channel conditions generally are not rapidly changing and it is therefore more feasible to track channel conditions accurately for precoding weight generation
  • Such scenarios include (but are not limited to) short range communications (e g in homes, hotspot areas, and office buildings), and low-mobility modes in microcellular deployments in city centers Rather large channel coherence times can be expected in those scenarios, meaning that the CSI will not vary too rapidly
  • a downlink transmitter e g , a base station
  • UE user equipment
  • each multi-antenna UE must transmit per-antenna pilots on the uplink
  • the transmission of pilot symbols on the uplink from each UE antenna is necessary because MU-MIMO precoding at the base station is done over individual receive antennas, not users
  • One approach to providing per-antenna pilot symbols from a UE is to implement a radio transmitter chain per antenna, thereby allowing the transmission of different pilot signals from each UE antenna
  • having one radio transmitter chain per antenna is beneficial in other regards, too
  • that arrangement allows implementation of MIMO transmission techniques in the uplink
  • the UE could implement uplink transmit diversity, e g in the form of Alamouti coding
  • uplink transmit diversity e g in the form of Alamouti coding
  • a wireless communication terminal includes one radio transmitter chain, but time-wise switches that transmitter between two or more of its antennas This switching between antennas may be referred to as “antenna hopping" and the terminal is configured to perform such hopping to thereby provide a supporting base station with antenna-specific pilot information for use in Multi-User Multiple- Input-Multiple-Output (MU-MIMO) precoding of the base station's downlink transmissions
  • MU-MIMO Multi-User Multiple- Input-Multiple-Output
  • such a method comprises switching a transmitter radio circuit of a wireless communication terminal between individual ones of two or more antennas of the wireless communication terminal according to a desired per-antenna pilot transmission timing, and transmitting per-antenna pilot information from each of the two or more antennas according to the desired per-antenna pilot transmission timing
  • the desired per-antenna pilot transmission timing may be determined, for example, according to a Time Division Duplex (TDD) frame timing governing downlink and uplink transmissions between the
  • Fig 1 is a partial diagram of a wireless communication network, including one embodiment of a base station configured for Multi-User Multiple-lnput-Multiple-Output (MU- MIMO) precoding of its downlink transmissions, and at least one associated wireless communication terminal that is configured to using antenna-hopping for providing per- antenna pilot information on the uplink in support of that downlink precoding
  • Fig 2 is a diagram of one embodiment of a wireless communication terminal configured for per-antenna pilot transmission via antenna hopping
  • Fig 3 is a logic flow diagram of one embodiment of antenna-hopping processing at a wireless communication terminal
  • Fig 4 is a block diagram of one embodiment of functional circuit details for implementing antenna hopping at a wireless communication terminal
  • Fig 5 is a diagram of antenna hopping for per-antenna pilot transmission in accordance with a defined TDD frame timing
  • Fig 1 partially illustrates a wireless communication network that includes a base station 10 that uses Multi-User Multiple-lnput-Multiple-Output (MU-MIMO) precoding to serve a number of wireless communication terminals 12
  • Terminals 12-1 , 12-2, and 12-3 are illustrated as an example
  • the terminals 12 which also may be referred to as user equipments (UEs) or mobile stations (MSs) — comprise essentially type of wireless communication device, such as cellular radiotelephones, pagers, radio network cards or modules, etc
  • the base station 10 and terminals 12 may be configured, for example, according to a desired communications standard, such as IEEE 802 16 (WiMAX)
  • a desired communications standard such as IEEE 802 16 (WiMAX)
  • WiMAX WiMAX
  • the base station 10 includes a precoding processor 20 for producing weighted (precoded) streams, combining circuits 22 for combining the weighted streams, and a set of transmit antennas 24 for transmitting the weighed streams
  • the representative terminals 12 are illustrated as each comprising a set of receive antennas 30 for receiving the base station's precoded downlink transmissions and which also may be used for transmission on the uplink, and receiver circuits 32 for obtaining information streams of interest from the received downlink transmissions
  • the base station 10 requires full Channel State Information (CSI) for the propagation channels between each of its transmitting antennas and each of the terminal's receiving antennas, and the terminals 12 therefore provide independent pilot information from each of their antennas (or at least those antennas involved in MU-MIMO downlink reception)
  • CSI Channel State Information
  • At least one of the terminals 12, e g , terminal 12-1 includes a single transmitter radio circuit but nonetheless provides per-antenna pilot information to the base station 10 for supporting the base station's MU-MIMO precoding by time-wise switching that single transmitter radio circuit between the terminal's antennas
  • the terminal 12-1 provides pilot information from each of the terminal's antennas that is fully resolvable by the base station 10 with respect to the pilot information sent from the terminal's other antennas
  • the base station (BS) 10 is equipped with M 1 antennas, and each terminal 12 is equipped with M R k antennas (where "A-" equals 2 in
  • D e C A/R IS a block-diagonal matrix containing the receiver processing filter D, e C'' ⁇ / "
  • the matrix H e C U ⁇ v ⁇ / ⁇ represents the MIMO channel matrix
  • F [F v , F ⁇ ] e C ⁇ ' T ' denotes the overall precoding matrix
  • the vectors x , y and n represent the vectors of sent symbols, received symbols, and additive noise at the receive antennas, respectively
  • the precoding matrices F k e C A// /( should be calculated such that the multi-user interference is minimized while balancing it with noise enhancement
  • SMMSE and RBD are two precoding techniques that can achieve that desired balance
  • Further explanatory details, including performance results, can be found, for example, IST-4- 027756 WINNER II, "D3 4 1 The WINNER Il Air Interface Further Refinement Spatial- Temporal Processing Solutions," November 2006
  • the base station processing relies on the assumption that the BS 10 has accurate CSI available for computation of the precoding matrices
  • the BS 10 can acquire the needed CSI based on making channel estimates from the uplink signals received from the terminals 12 However, as noted, the BS 10 must be able to estimate propagation channels relative to individual ones of the antennas 30 at each terminal 12
  • a basic mechanism for enabling this estimation is the transmission of pilot information, e g , reference symbols, pilot symbols, training sequences, or other predefined information, from each antenna for which downlink channel estimation is to be performed
  • one or more given ones of the terminals 12 may include a radio transmitter circuit for each antenna, such that each radio transmitter circuit can be used to transmit pilot information from its respective antenna
  • at least one of the terminals 12 is advantageously configured to provide per-antenna pilot information, without requiring more than one transmitter radio chain
  • at least one of the terminals 12, e g , terminal 12-1 includes a single transmitter radio circuit — not shown in Fig 1 — but nonetheless provides per-antenna pilot information to the base station 10 for supporting the base station's MU-MIMO precoding by time-wise switching that single transmitter radio circuit between the terminal's antennas 30 In this manner,
  • Fig 2 illustrates the terminal 12-1 in more detail, and in particular illustrates the inclusion of an antenna-hopping transmit processor 40, which may be implemented in hardware, software, or any combination thereof
  • the antenna- hopping transmit processor comprises a microprocessor-based circuit that is provisioned or otherwise configured through the execution of stored program instructions to carry out the desired antenna-hopping transmission processing An example of such processing appears in the logic flow diagram of Fig 3
  • the antenna-hopping transmit processor 40 of the terminal 12-1 is configured to implement a method of transmitting per-antenna pilot information to enable antenna-specific downlink transmission precoding by the BS 10
  • the method includes switching a (single) transmitter radio circuit of the terminal 12-1 between individual ones of two or more antennas 30 of the terminal 12-1 according to a desired per-antenna pilot transmission timing (Block 100)
  • the method further includes transmitting per-antenna pilot information from each of the two or more antennas 30 according to the desired per-antenna pilot transmission timing (Block 102)
  • the terminal 12-1 also may transmit uplink data from different ones of the antennas 30, as part of its antenna hopping For example, it may switch to a first one of the antennas 30 and transmit pilot information, along with uplink data Then, at a later transmission interval, it may transmit pilot information from a second one of the transmit antennas 30, along with further uplink data
  • the terminal 12-1 thus
  • the control circuit 46 thus may control the coupling circuit 42 for TDD-based reception and transmission, and may change which one of the antennas 30 is used in each transmit interval More particularly, this arrangement permits the terminal 12-1 to "hop" from the antenna 30-1 to the antenna 30-2 (and back) as needed or desired, to transmit pilot information from each antenna according to a desired pilot information transmission timing
  • the control circuit 46, or some other functional element of the terminal 12-1 may be configured to determine the desired per-antenna pilot transmission timing according to a TDD frame timing governing downlink and uplink transmissions between the supporting base station 10 and the terminal 12-1
  • the terminal 12-1 switches between the individual ones of the transmit antennas 30 to the TDD frame timing That switching is illustrated, for example, in Fig 5, where a series of TDD frames is illustrated, and the cyclic hopping between antennas 30-1 and 30-2 (with reference to Fig 4) is illustrated Note, too, that the terminal 12-1 may be configured to transmit the same pilot information from each of the antenna
  • the terminal 12-1 may operate in modes, such as one mode where it uses antenna hopping and another mode where it does not Signaling between it and the BS 10 may be used for mode control Or, in some cases, signaling may be used by the terminal 12-1 simply to report its "class,” or otherwise to indicate that it will use antenna-hopping to effect per-antenna pilot transmissions in support of the BS's MU- MIMO precoding That information is useful at the BS 10 for understanding the rates and/or times at which per-antenna pilot information will be supplied by the terminal 12-1
  • the timings and other information can be used to report its "class," or otherwise to indicate that it will use antenna-hopping to effect per-antenna pilot transmissions in support of the BS's MU- MIMO precoding
  • pilot overhead reduction arises from the ability to reuse the same pilot information, e g , the same pilot symbol(s), across the terminal's antennas, because only one antenna at a time transmits pilot information
  • terminals that use multiple transmitter radio chains to send pilots from each antenna in the same transmission interval generally must send different pilot information from each antenna, e g , different pilot symbol/coding values

Landscapes

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

Abstract

Selon la présente invention, un terminal de communication sans fil comporte une seule chaîne d'émetteur radio, mais commute temporellement cet émetteur entre deux de ses antennes ou plus. Cette commutation entre antennes peut être appelée « diversité d'antenne » et le terminal est configuré pour effectuer cette commutation afin de fournir à une station de base de support des informations de pilote spécifiques à l'antenne pour une utilisation dans un précodage entrée multiple - sortie multiple multi-utilisateur (MU-MIMO) des transmissions descendantes de la station de base.
PCT/SE2007/050739 2007-10-12 2007-10-12 Procédé et appareil d'émission de pilote par antenne supportant une transmission mimo multi-utilisateur WO2009048362A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/050739 WO2009048362A1 (fr) 2007-10-12 2007-10-12 Procédé et appareil d'émission de pilote par antenne supportant une transmission mimo multi-utilisateur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2007/050739 WO2009048362A1 (fr) 2007-10-12 2007-10-12 Procédé et appareil d'émission de pilote par antenne supportant une transmission mimo multi-utilisateur

Publications (1)

Publication Number Publication Date
WO2009048362A1 true WO2009048362A1 (fr) 2009-04-16

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PCT/SE2007/050739 WO2009048362A1 (fr) 2007-10-12 2007-10-12 Procédé et appareil d'émission de pilote par antenne supportant une transmission mimo multi-utilisateur

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103983967A (zh) * 2014-05-22 2014-08-13 重庆大学 多目标微变形分时遥测方法与系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002080380A1 (fr) * 2001-03-30 2002-10-10 Matsushita Electric Industrial Co., Ltd. Procede et systeme d'emission en diversite a commutation temporelle selective (ststd) combinee
EP1284545A1 (fr) * 2001-08-13 2003-02-19 Motorola, Inc. Communication sans fil utilisant l'émission en diversité
US20060072604A1 (en) * 2004-07-19 2006-04-06 Arak Sutivong On-demand reverse-link pilot transmission
EP1739847A2 (fr) * 2005-07-01 2007-01-03 Samsung Electronics Co., Ltd. Commutateur émission-réception dans un système de communications sans fil
US20070280340A1 (en) * 2006-06-05 2007-12-06 Samsung Electronics Co., Ltd. Apparatus and method for uplink channel sounding in a wireless communication system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002080380A1 (fr) * 2001-03-30 2002-10-10 Matsushita Electric Industrial Co., Ltd. Procede et systeme d'emission en diversite a commutation temporelle selective (ststd) combinee
EP1284545A1 (fr) * 2001-08-13 2003-02-19 Motorola, Inc. Communication sans fil utilisant l'émission en diversité
US20060072604A1 (en) * 2004-07-19 2006-04-06 Arak Sutivong On-demand reverse-link pilot transmission
EP1739847A2 (fr) * 2005-07-01 2007-01-03 Samsung Electronics Co., Ltd. Commutateur émission-réception dans un système de communications sans fil
US20070280340A1 (en) * 2006-06-05 2007-12-06 Samsung Electronics Co., Ltd. Apparatus and method for uplink channel sounding in a wireless communication system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103983967A (zh) * 2014-05-22 2014-08-13 重庆大学 多目标微变形分时遥测方法与系统

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