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WO2000064113A1 - Procede d'estimation de voie dans un systeme de radiotelephonie mobile tdma - Google Patents

Procede d'estimation de voie dans un systeme de radiotelephonie mobile tdma Download PDF

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Publication number
WO2000064113A1
WO2000064113A1 PCT/DE2000/001178 DE0001178W WO0064113A1 WO 2000064113 A1 WO2000064113 A1 WO 2000064113A1 DE 0001178 W DE0001178 W DE 0001178W WO 0064113 A1 WO0064113 A1 WO 0064113A1
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WO
WIPO (PCT)
Prior art keywords
channel estimation
bursts
channel
burst
mobile radio
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.)
Ceased
Application number
PCT/DE2000/001178
Other languages
German (de)
English (en)
Inventor
Stefan Bahrenburg
Paul Walter Baier
Dieter Emmer
Jürgen Mayer
Johannes Schlee
Tobias Weber
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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, Siemens Corp filed Critical Siemens AG
Publication of WO2000064113A1 publication Critical patent/WO2000064113A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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

Definitions

  • TDMA Time Division Multiple Access
  • CDMA Code Division Multiple Access
  • a channel estimate is required to carry out the data estimation.
  • the channel estimation in the TDMA-based systems is based on a training sequence, which is generally referred to as the midamble, the midamble being arranged between two data blocks.
  • the unit consisting of the midamble and the two data blocks is called a burst.
  • He is ⁇ from Bernd Steiner: "A contribution to the mobile channel ⁇ assessment with special reference synchronous CDMA mobile radio systems using joint detection" Progress Reports VDI, Series 10, No. 337, Dusseldorf. VDI-Verlag, 1995, that the length L m the midamble in TD-CDMA mobile radio systems, due to the algorithm used for channel estimation, directly depends on the number of active subscribers K and the maximum expected length W of the channel impulse response
  • the length L m of the midamble is therefore a limiting factor for the number of active subscribers that can be present in the uplink per burst. If techniques such as "voice activity" or adaptive data rates are to be used, it may even be necessary to support more participants than are actually actually active per burst, in other words to include them in the channel estimation.
  • mid-length and the burst portion available for data transmission has previously been found.
  • the mid-bamboo length is dimensioned such that at least as many channels can be estimated as CDMA codes can be detected simultaneously in one cell.
  • the number of CDMA codes that can be detected simultaneously is essentially determined by the spreading factor used and the intercell interference. Therefore, a useful compromise between mid-wavelength and the number of channels that can be estimated is only possible if the spreading factor is not too large, in other words, if relatively few participants have the data transmission capacity of a burst divide. This means that the minimum data rate is too high for many applications and offers little scope for applying the abovementioned capacity-increasing measures such as voice activity, adaptive data rates, antenna diversity and elimination of intercell interference.
  • the invention is therefore based on the object of providing a method and a device with which an estimate of an increased number of channels is possible without increasing the proportion of the burst for the midamble.
  • the maximum time interval between two channel impulse responses within which the channel impulse responses can be regarded as correlated is defined as the coherence time T ⁇ .
  • the coherence time T % is inversely proportional to the speed of a participant.
  • the channel impulse responses of successive bursts almost the same, that is, the period T au f in which the successive data bursts are transmitted, is essential lent smaller than the above-defined coherence time TR, as a single channel impulse response to estimate the usable for channel estimation received values multiple bursts used.
  • participants with low speed meet the condition
  • Short midambles can preferably be transmitted within the burst, the channel estimate then determining a current channel impulse response from the received values e (x) of several successive bursts x originating from the midambles.
  • the midamble can be the shorter, ⁇ e the lower the speed of a mobile station, since this makes the coherence time T the greater, and the higher the data rate can be achieved.
  • preambles can advantageously be chosen to be shorter than midambles, which, for example, increases the data rate. If the preamble and the midamble are of the same length, the use of preambles enables a higher number of participants.
  • Fig. 1 shows the division of a midamble m several shorter midambles
  • Fig. 2 shows the use of periodic midamble codes.
  • 1 shows the division of a midamble m into a plurality of midamble m (x), where x runs from 1 to X.
  • the total received signal originating from the middle tones of the participants results from the superimposition of the signals of the K participants
  • reception sequence ⁇ is shorter by W elements than the midamble, since reception values with interference from the data blocks cannot be used for channel estimation.
  • the signal e ⁇ must also arise through the transmission of the midamble in sections.
  • the received values of e ⁇ l) result from the transmission sequence of the midamble part m (l) and, since the channel impulse response is of length W, from the W-1 previous samples from block m (0).
  • the received values of en (2) result from the transmission sequence m (2) and, since the channel impulse response has the length W, from the W-1 previous sample values from block m (l). The same applies to the reception values em) and £ 2. ().
  • the identical signal £ 1 -, [ ⁇ j ⁇ (1) ... 3 , (4)] can be composed of the four reception sequences if the Channel impulse response is constant.
  • the channel estimation can be done inexpensively according to a method described in the article mentioned above.
  • the estimation of the channel impulse response can be carried out in the steady state after the reception of each burst and thus of each section e ⁇ (x), for example if a temporally older £, “(1) is replaced by a section of the same name that has just been received. Therefore, the result of the channel estimation is adapted to the slowly changing channel.
  • the midamble distribution at the channel estimator manifests itself as a cyclical interchanging of the midambles used by the subscribers.
  • Exactly the same channel estimator can be used for each burst, which uses the midamble reception signals of the last X bursts.
  • the estimated value h of the channel impulse responses is given by the constant, right-circulating matrix G ⁇ ⁇ , which depends only on the midamble codes used
  • the basic periodic ⁇ code PGC m is four components divided, starting in each case with m ⁇ _, 5JW + i / 52 W +1 'and 5 ⁇ 3 + 1
  • ends of the peri ⁇ odic basic code PGC with the character ⁇ f - the basic code PGC is always periodically shifted by one block between the subscribers Tl, T2, T3 and T4, where m the midamble Ml of the subscriber Tl sends the components m_ and mw + 1 , while the subscriber T2 sends the components ⁇ + 1 and 52 W +1 ', the subscriber T3 the components ⁇ 2 +1 and 5.3 W + 1 and the subscriber T4 the components m2 W + l and ⁇ ⁇ TM 1 ⁇ in this order .
  • the 8 components of the periodic basic code PGC which are arranged above it in each case in the middle messages M2 to M4 are sent.
  • the midamble Ml is sent in the first burst B1, while the midambles M2 to M4 m are sent to the corresponding subsequent second to fourth bursts.
  • the components of the first midamble Ml sent in the first burst Bl are shown in the partial image at the bottom right.
  • the invention can be applied to any mobile radio system with a TDMA component, that is to say it is not restricted to the use of m TD-CDMA systems.

Landscapes

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

Abstract

L'invention concerne un procédé d'estimation de voie dans des systèmes de radiotéléphonie mobile TDMA, consistant à utiliser, pour l'estimation d'une seule réponse d'impulsion de voie, les valeurs de réception de plusieurs paquets utilisables pour l'estimation de voie, dans le cas où l'intervalle de temps Tauf, dans lequel des paquets de données successifs sont transmis est sensiblement inférieur au temps cohérent TK.
PCT/DE2000/001178 1999-04-16 2000-04-14 Procede d'estimation de voie dans un systeme de radiotelephonie mobile tdma Ceased WO2000064113A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19917334.6 1999-04-16
DE1999117334 DE19917334A1 (de) 1999-04-16 1999-04-16 Mittambelstruktur für TD-CDMA-Mobilfunksysteme

Publications (1)

Publication Number Publication Date
WO2000064113A1 true WO2000064113A1 (fr) 2000-10-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2000/001178 Ceased WO2000064113A1 (fr) 1999-04-16 2000-04-14 Procede d'estimation de voie dans un systeme de radiotelephonie mobile tdma

Country Status (2)

Country Link
DE (1) DE19917334A1 (fr)
WO (1) WO2000064113A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004059864A1 (fr) * 2002-12-30 2004-07-15 Koninklijke Philips Electronics N.V. Procede et dispositif de maintien d'une localisation de synchronisation dans une communication drt sans fil
US6961365B2 (en) 2000-04-11 2005-11-01 China Academy Of Telecommunications Technology Method for signal processing in user equipment of CDMA mobile communication system
WO2006102792A1 (fr) * 2005-03-29 2006-10-05 Zte Corporation Procede pour estimer la voie dans un systeme tdd-cdma
CN1305324C (zh) * 2003-03-21 2007-03-14 乐金电子(中国)研究开发中心有限公司 基于构造的期望中间码的自适应信道估计方法和装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7068631B2 (en) 2001-08-06 2006-06-27 Telefonaktiebolaget Lm Ericsson (Publ) Training sequence hopping in a radio communication system
EP2226963B1 (fr) 2009-03-04 2013-05-08 Sony Corporation Appareil de réception et procédé sans sur-échantillonnage de conversion analogique-numérique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212300A1 (de) * 1992-04-11 1993-10-14 Paul Walter Prof Dr Ing Baier Verfahren und Einrichtung zum gleichzeitigen Schätzen von Kanälen bei der digitalen Nachrichtenübertragung in Vielfachzugriffssystemen
DE4311656C1 (de) * 1993-04-08 1994-04-21 Ant Nachrichtentech Geradeinterpolationsmethode zur Kanalstoßantwortadaption in Empfängern für TDMA-Mobilfunksysteme
DE19733336A1 (de) * 1997-08-01 1999-02-18 Siemens Ag Verfahren und Funkstation zur Datenübertragung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4233222C2 (de) * 1992-10-02 1995-07-20 Siemens Ag Meßsystem (Channel Sounder) zur Untersuchung von Mobilfunkkanälen
DE19747369A1 (de) * 1997-10-27 1999-05-06 Siemens Ag Übertragungskanalschätzung in Telekommunikationssystemen mit drahtloser Telekommunikation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212300A1 (de) * 1992-04-11 1993-10-14 Paul Walter Prof Dr Ing Baier Verfahren und Einrichtung zum gleichzeitigen Schätzen von Kanälen bei der digitalen Nachrichtenübertragung in Vielfachzugriffssystemen
DE4311656C1 (de) * 1993-04-08 1994-04-21 Ant Nachrichtentech Geradeinterpolationsmethode zur Kanalstoßantwortadaption in Empfängern für TDMA-Mobilfunksysteme
DE19733336A1 (de) * 1997-08-01 1999-02-18 Siemens Ag Verfahren und Funkstation zur Datenübertragung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STEINER B ET AL: "OPTIMUM AND SUBOPTIMUM CHANNEL ESTIMATION FOR THE UPLINK OF CDMA MOBILE RADIO SYSTEMS WITH JOINT DETECTION", EUROPEAN TRANSACTIONS ON TELECOMMUNICATIONS AND RELATED TECHNOLOGIES, vol. 5, no. 1, 1994, IT,AEI, MILANO, pages 39 - 50, XP000445714, ISSN: 1120-3862 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6961365B2 (en) 2000-04-11 2005-11-01 China Academy Of Telecommunications Technology Method for signal processing in user equipment of CDMA mobile communication system
WO2004059864A1 (fr) * 2002-12-30 2004-07-15 Koninklijke Philips Electronics N.V. Procede et dispositif de maintien d'une localisation de synchronisation dans une communication drt sans fil
CN100438640C (zh) * 2002-12-30 2008-11-26 Nxp股份有限公司 用于tdd无线通信下行同步跟踪的采样方法及其装置
US7715510B2 (en) 2002-12-30 2010-05-11 St-Ericsson Sa Method and device to maintain synchronization tracking in TDD wireless communication
CN1305324C (zh) * 2003-03-21 2007-03-14 乐金电子(中国)研究开发中心有限公司 基于构造的期望中间码的自适应信道估计方法和装置
WO2006102792A1 (fr) * 2005-03-29 2006-10-05 Zte Corporation Procede pour estimer la voie dans un systeme tdd-cdma

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DE19917334A1 (de) 2000-10-26

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