EP1393460A1 - Verfahren zur kanalschätzung eines mobilfunkkanals und mobilfunk-empfangsgerät - Google Patents

Verfahren zur kanalschätzung eines mobilfunkkanals und mobilfunk-empfangsgerät

Info

Publication number
EP1393460A1
EP1393460A1 EP02737832A EP02737832A EP1393460A1 EP 1393460 A1 EP1393460 A1 EP 1393460A1 EP 02737832 A EP02737832 A EP 02737832A EP 02737832 A EP02737832 A EP 02737832A EP 1393460 A1 EP1393460 A1 EP 1393460A1
Authority
EP
European Patent Office
Prior art keywords
channel
interpolation
mobile radiotelephone
impulse response
threshold value
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.)
Withdrawn
Application number
EP02737832A
Other languages
German (de)
English (en)
French (fr)
Inventor
Yingjie Gao
Benjamin Schwarze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nokia Solutions and Networks GmbH and Co KG
Original Assignee
Siemens AG
Nokia Siemens Networks GmbH and Co KG
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 Siemens AG, Nokia Siemens Networks GmbH and Co KG filed Critical Siemens AG
Publication of EP1393460A1 publication Critical patent/EP1393460A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7113—Determination of path profile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/7117—Selection, re-selection, allocation or re-allocation of paths to fingers, e.g. timing offset control of allocated fingers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H04B1/7115—Constructive combining of multi-path signals, i.e. RAKE receivers
    • H04B1/712—Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop

Definitions

  • the invention relates to a method for channel estimation of a mobile radio channel according to the preamble of claim 1 and a mobile radio receiver.
  • Each individual received signal has a different transit time, amplitude and Doppler shift in accordance with its transmission path.
  • the various received signals overlap either constructively or destructively on the antenna of a receiver and thereby make it more difficult to detect the useful data transmitted by the signals.
  • such multi-path propagation causes a radio signal time expanded channel pulse responses indicate perform the loan to a delay spread, and thus a shifted time "reference of the individual symbols of the transmission signal to one another.
  • W CDMA Wi-Code Division Multiplex
  • RAKE receivers special receivers
  • Such a RAKE receiver enables a clear gain through the use of multi-way signals which arrive at a receiving antenna of a mobile radio device with different delay times.
  • the signal coming from the antenna is processed in the receiver in several paths, the so-called "fingers" of the RAKE receiver.
  • Each of these fingers is opened with an optimized phase position of the pseudo-noise sequences that were used to encode a signal to be transmitted via the mobile radio channel U ⁇ DO t H "
  • ⁇ rt 0 ⁇ 0 ⁇ - ⁇ ⁇ - cd ⁇ - «P. ⁇ -
  • CD ⁇ CQ 0 0 J 3 et ⁇ Hi CQ ⁇ ⁇ - PJ li 0 H- P CQ CQ N rt LQ 0 J ⁇ PJ 0
  • a transmission time slot transmit so-called pilot bits for channel estimation. These pilot bits are used to calculate the channel coefficients valid during the respective slot.
  • the calculated channel coefficients are interpolated between two adjacent slots. This interpolation can lead to incorrect results if the channel coefficients calculated in neighboring slots that are used in the interpolation do not describe the same path of multipath propagation.
  • the invention is therefore based on the object of providing an improved method for channel estimation which delivers more precise, more reliable results.
  • the invention includes the basic idea before interpolating those calculated from the impulse responses Channel coefficients to carry out a comparative check of the impulse responses in the two slots to determine whether the individual maxima can actually be assigned to the same propagation paths. Only those portions (especially maxima) of the channel impulse response are used for the interpolation mentioned that are to be assigned to the same transmission path in both slots.
  • the embodiment of the invention is preferably carried out by determining the time shift of the individual maxima or fingers of the pulse location that they experienced between the two time slots, and a subsequent threshold value discrimination of the time shift values.
  • the channel coefficients determined on the basis of the finger positions share the same transmission path (which is sometimes also referred to as "channel” by the specialists in this area) ) represent.
  • the predetermined threshold of discrimination is chip.
  • fingers 1 'and 1''and3' and 3 1 ' are to be used for an interpolation, but not fingers 2' and 2 ''.
  • the design of the inventive concept in terms of the device will normally be carried out by software, but it can also - at least in part - be supported by hard-wired logic.
  • the mobile radio receiving device embodying the device aspect can in principle be implemented both in a terminal (mobile phone) and in a base station, since the channel estimation mentioned can in principle be carried out both in the upward direction (in the uplink) and in the downward direction (in the downlink) .

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
EP02737832A 2001-05-10 2002-05-08 Verfahren zur kanalschätzung eines mobilfunkkanals und mobilfunk-empfangsgerät Withdrawn EP1393460A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10122689 2001-05-10
DE10122689A DE10122689C2 (de) 2001-05-10 2001-05-10 Verfahren zur Kanalschätzung eines Mobilfunkkanals und Mobilfunk-Empfangsgerät
PCT/DE2002/001668 WO2002091608A1 (de) 2001-05-10 2002-05-08 Verfahren zur kanalschätzung eines mobilfunkkanals und mobilfunk-empfangsgerät

Publications (1)

Publication Number Publication Date
EP1393460A1 true EP1393460A1 (de) 2004-03-03

Family

ID=7684268

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02737832A Withdrawn EP1393460A1 (de) 2001-05-10 2002-05-08 Verfahren zur kanalschätzung eines mobilfunkkanals und mobilfunk-empfangsgerät

Country Status (6)

Country Link
US (1) US20030186657A1 (ja)
EP (1) EP1393460A1 (ja)
JP (1) JP3638587B2 (ja)
CN (1) CN1215651C (ja)
DE (1) DE10122689C2 (ja)
WO (1) WO2002091608A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050169353A1 (en) * 2004-02-02 2005-08-04 Wei An Post despreading interpolation in CDMA systems
CN100356706C (zh) * 2005-05-26 2007-12-19 北京航空航天大学 基于线性调频序列的扩频通信系统中的分集接收方法
JP5032538B2 (ja) * 2009-08-28 2012-09-26 株式会社東芝 伝送路応答推定器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6208632B1 (en) * 1998-01-29 2001-03-27 Sharp Laboratories Of America System and method for CDMA channel estimation
JP3029031B2 (ja) * 1998-09-03 2000-04-04 日本電気株式会社 内挿同期検波方法と無線通信システム
DE19922184A1 (de) * 1999-05-12 2000-11-23 Siemens Ag Verfahren zur Schätzung von Kanalparametern
JP4284813B2 (ja) * 2000-02-18 2009-06-24 株式会社デンソー Ｏｆｄｍ用受信装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02091608A1 *

Also Published As

Publication number Publication date
CN1462513A (zh) 2003-12-17
WO2002091608A1 (de) 2002-11-14
JP3638587B2 (ja) 2005-04-13
DE10122689A1 (de) 2003-01-09
CN1215651C (zh) 2005-08-17
JP2004519975A (ja) 2004-07-02
US20030186657A1 (en) 2003-10-02
DE10122689C2 (de) 2003-04-30

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