EP1038359A2 - Übertragungskanalschätzung in telekommunikationssystemen mit drahtloser telekommunikation - Google Patents

Übertragungskanalschätzung in telekommunikationssystemen mit drahtloser telekommunikation

Info

Publication number
EP1038359A2
EP1038359A2 EP98955359A EP98955359A EP1038359A2 EP 1038359 A2 EP1038359 A2 EP 1038359A2 EP 98955359 A EP98955359 A EP 98955359A EP 98955359 A EP98955359 A EP 98955359A EP 1038359 A2 EP1038359 A2 EP 1038359A2
Authority
EP
European Patent Office
Prior art keywords
impulse response
channel impulse
transmitter
receiver
bts2
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
EP98955359A
Other languages
German (de)
English (en)
French (fr)
Inventor
Anja Klein
Markus Nasshan
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP1038359A2 publication Critical patent/EP1038359A2/de
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0845—Weighted combining per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • transmitting and receiving devices are used for message processing and transmission in which
  • the message processing and message transmission can take place in a preferred transmission direction (simplex mode) or in both transmission directions (duplex mode), 2) the message processing is analog or digital,
  • FDMA Frequency Division Multiple Access
  • TDMA Time Division Multiple Access
  • CDMA Code Division Multiple Access
  • the type of transmission according to (1) ... (3) is usually characterized by continuous (analog) signals, while the type of transmission according to (4) usually produces discontinuous signals (eg impulses, digital signals).
  • the invention relates to a method for estimating transmission channels in telecommunication systems with wireless telecommunication according to the preambles of claims 1, 6, 9 and 11 and to transceivers for estimating transmission channels in telecommunication systems with wireless Telecommunications according to the preambles of claims 22, 27, 30 and 32.
  • the radio telecommunications scenario of the second generation is currently in the micro or macro cell range from the GSM-specific radio telecommunications system based on the FDMA / TDMA / FDD transmission principle (Frequency Division Duplex)
  • FIGURE 1 shows that for the transmission of user data on the traffic channel (Traffic CHannel TCH) from the publications “(1): Informatik Spektrum 14 (1991) June, No. 3, Berlin, DE; A. Mann: "The GSM standard - the basis for digital European mobile radio networks", pages 137 to 152; (2): R. Steele: Mobile Radio Communications, Pentech Press, 1992 (Reprint 1994), Chapter 8: The Pan-European Digi tal Cell ular Mobile Radio System - known as GSM, page 677 ff.; (3): teleko praxis 4/1993, P.
  • TCH Traffic CHannel TCH
  • GSM radio interface - elements and functions pages 17 and 24 "well-known TCH multi-frame, TDMA frame and TDMA time slot structure of GSM mobile radio - Concept in which the data embedded in the structure shown in accordance with the FDD principle in the uplink or uplink direction (uplink; transmission “mobile station -” base station ”) in the frequency band between 890 MHz and 915 MHz and in the downlink or downlink direction ( downlink; transmission “base station -» mobile station ”) in the frequency band between 935 MHz and 960 MHz.
  • FIGURE 2 shows that from the publication "Message Technology Electronics 42 (1992) Jan./Feb. No. 1, Berlin, DE; U. Pilger "Structure of the DECT standard", pages 23 to 29 "known
  • Multirah en, TDMA frame and TDMA time slot structure of the DECT mobile radio concept in which the data embedded in the structure shown according to the TDD principle in the downlink or downlink direction (downlink; transmission “base station - ⁇ mobile station”) in time slots 0 ... 11 and in the uplink or uplink (uplink; transmission "mobile station -> base station”) in time slots 12 ... 23.
  • FIGURE 3 shows, starting from the publication sympathomimetic ⁇ nik Elektronik, Berlin 45, 1995, Book 1, Pages 10 to 14 and Book 2, Pages 24 to 27; P. Jung, B. Steiner: “Concept of a CDMA mobile radio system with common detection for the third generation of mobile telephony "a possible FDMA / TDMA / CDMA multiple access for the uplink (uplink; transmission direction" mobile station -> base station ”) and downlink (uplink; transmission direction" mobile station -> base station ”) a telecommunications system with CDMA, FDMA and TDMA multiple access components, for example a joint detection CDMA mobile radio concept, in which - as with the GSM system (see FIG. 1) - the data in accordance with the FDD principle in the uplink or upward direction (uplink; transmission "mobile station -> base station”) and in the downlink or downward direction (downlink; transmission "base station -» mobile station ”) are transmitted in different frequency bands.
  • FIGURE 4 shows, starting from the representation of the multiple access in FIGURE 3, that from the publication septenentechnik Elektronik, Berlin 45, 1995, number 1, pages 10 to 14 and number 2, pages 24 to 27; P. Jung, B. Steiner: "Concept of a CDMA mobile radio system with common detection for the third generation of mobile radio", known time slot structure (burst structure) of the uplink (shown in FIG. 5 of the publication) (up link; transmission direction "handset -> base station”) of the Joint Detection CDMA mobile radio concept.
  • FIGURE 5 shows on the basis of a GSM radio scenario with, for example, two radio cells and base stations (base transceiver station) arranged therein, a first base station BTS1 (Transmitter / receiver) a first radio cell FZ1 and a second base station BTS2 (transmitter / receiver) "illuminates" a second radio cell FZ2 omnidirectionally, a FDMA / TDMA / CDMA radio scenario in which the base stations BTS1, BTS2 use a for the FDMA / TDMA / CDMA radio scenario designed air interface with several mobile stations MS1 ...
  • the base stations BTS1, BTS2 are connected in a known manner (cf. GSM telecommunication system) to a base station controller BSC (BaseStation Controller), which is used to control the base stations
  • BSC BaseStation Controller
  • the base station controller BSC is on its part via a mobile switching center MSC (M obile switching center) with the higher-level telecommunications network, for example the PSTN (Public Switched Telecommunication Network).
  • the mobile switching center MSC is the administration center for the telecommunications system shown. It takes over the complete call management and, with attached registers (not shown), the authentication of the telecommunication participants and the location monitoring in the network.
  • FIGURE 6 shows the basic structure of the base station BTS1, BTS2 designed as a transmitter / receiver
  • FIGURE 7 shows the basic structure of the mobile station MT1 ... MT5 also designed as a transmitter / receiver.
  • the base station BTS1, BTS2 takes over the sending and receiving of radio messages from and to the mobile station MTS1..MTS5, while the mobile station MT1 ... MT5 takes over the sending and receiving of radio messages from and to the base station BTS1, BTS2.
  • the base station has a transmission antenna SAN and a reception antenna EAN
  • the mobile station MT1... MT5 has an antenna ANT that can be controlled for transmission and reception by an antenna switchover AU.
  • BTS2 receives at least one radio message FN with an FDMA / TDMA / CDMA component from at least one of the mobile stations MT1 ... MT5, while the mobile station MT1 ... MT5 in the downward direction (reception path) (Receive path) receives, for example, at least one radio message FN with an FDMA / TDMA / CDMA component from at least one base station BTS1, BTS2 via the common antenna ANT.
  • the radio message FN consists of a broadband spread carrier signal with information modulated onto data symbols.
  • the received carrier signal is filtered in a radio receiving device FEE and mixed down to an intermediate frequency, which in turn is subsequently sampled and quantized.
  • the signal After an analog / digital conversion, the signal, which has been distorted on the radio path by multipath propagation, is fed to an equalizer EQL, which largely compensates for the distortions (Stw.: Synchronization).
  • a channel estimator KS tries to estimate the transmission properties of the transmission channel TRC on which the radio message FN has been transmitted.
  • the transmission properties of the channel are specified in the time range by the channel impulse response.
  • the radio message FN is assigned (or in the present case by the mobile station MT1 ... MT5 or the base station BTS1, BTS2) a special additional information designed as a training information sequence in the form of a so-called Mitambel assigned.
  • Equalized and separated signal components in a known manner. After equalization and separation, a symbol-to- Data converter SDW converted the existing data symbols into binary data. The original bit stream is then obtained from the intermediate frequency in a demodulator DMOD before the individual time slots are assigned to the correct logical channels and thus also to the different mobile stations in a demultiplexer DMUX.
  • the bit sequence obtained is decoded channel by channel in a channel codec KC. Depending on the channel, the bit information becomes the control and signaling time slot or one
  • Voice time slot assigned and - in the case of the base station (FIGURE 6) - the control and signaling data and the voice data for transmission to the base station controller BSC jointly transferred to an interface SS responsible for signaling and voice coding / decoding (voice codec), while - in Case of the mobile station (FIGURE 7) - the control and signaling data of a control and signaling unit STSE responsible for complete signaling and control of the mobile station and the voice data are transferred to a voice codec SPC designed for voice input and output.
  • the speech data are stored in a predetermined data stream (e.g. 64kbit / s stream in the network direction or 13kbit / s stream from the network direction).
  • a predetermined data stream e.g. 64kbit / s stream in the network direction or 13kbit / s stream from the network direction.
  • the complete control of the base station BTS1, BTS2 is carried out in a control unit STE.
  • the base station BTS1, BTS2 sends, for example, at least one radio message FN with an FDMA / TDMA / CDMA component to at least one of the mobile stations MT1 ... MT5, while the mobile station MT1 ... MT5 in the upward direction
  • Transmission path via the common antenna ANT, for example at least one radio message FN with an FDMA / TDMA / CDMA Component sends at least one base station BTS1, BTS2.
  • the transmission path begins at the base station BTS1, BTS2 in FIGURE 6 by the fact that in the channel codec KC control and signaling data and voice data received from the base station controller BSC via the interface SS are assigned to a control and signaling time slot or a voice time slot and channel by channel a bit sequence can be encoded.
  • the transmission path begins at the mobile station MT1 ... MT5 in FIGURE 7 with the fact that in the channel codec KC speech data received from the speech codec SPC and control and signaling data received from the control and signaling unit STSE a control and Signaling time slot or a speech time slot are assigned and these are encoded channel by channel into a bit sequence.
  • the bit sequence obtained in the base station BTS1, BTS2 and in the mobile station MT1 ... MT5 is in each case converted into data symbols in a data-to-symbol converter DSW. Subsequently, the data symbols are spread in a spreading device SPE with a subscriber-specific code.
  • a burst generator BG consisting of a burst composer BZS and a multiplexer MUX
  • a training information sequence in the form of a shared message for channel estimation is then added to the spread data symbols in the burst composer BZS, and the burst information obtained in this way is set to the correct time slot in the multiplexer MUX .
  • the burst obtained is modulated at high frequency in a modulator MOD and converted to digital / analog before the signal obtained in this way is emitted as a radio message FN via a radio transmitter FSE on the transmit antenna SAN or the common antenna ANT.
  • a radio transmitter FSE on the transmit antenna SAN or the common antenna ANT.
  • the transmission properties of the mobile radio channel are characterized in the time domain by the channel impulse response. Particularly in TDMA-based mobile radio systems, attempts are therefore made in a known manner to estimate the channel impulse response of the mobile radio channel. You add training sequences or test signals, so-called midambles the message to be sent - in the case of TDMA-based telecommunications systems, the burst.
  • the channel impulse response of the mobile radio channel can then be determined with the aid of the received signal, which originates from the training sequence or the test signals.
  • the object on which the invention is based is to improve, simplify and optimize the estimation of wireless transmission channels in telecommunication systems.
  • the idea on which the invention is based essentially consists in using correlations of different channel impulse responses. This can be achieved in that (i) a telecommunications subscriber [eg, according to FIG. 5, a system-internal subscriber at the mobile station MS1 ... MS5 and / or another system-internal subscriber at the mobile station MS1 ...
  • a telecommunications subscriber eg, according to FIG. 5, a system-internal subscriber at the mobile station MS1 ... MS5 and / or another system-internal subscriber at the mobile station MS1 ...
  • MS5 Internal connection or a non-system participant in the higher-level PST network (external connection)] who receives messages intended for him (in the case of TDMA-based telecommunication systems a participant to whom, for example, the time slot #n of a TDMA frame is assigned) also messages that are for other subscribers are determined and are transmitted in the same transmission direction (in the case of TDMA-based telecommunication systems, another subscriber to whom, for example, the time slot #nl of a TDMA frame is assigned) for channel estimation used.
  • FIGURE 8 starting from FIGURE 6, the basic structure of a base station according to a first embodiment
  • FIGURE 9 starting from FIGURE 7, the basic structure of a mobile station according to a first embodiment
  • FIGURE 10 starting from FIGURE 6, the basic structure of a base station according to a second embodiment
  • FIGURE 11 starting from FIGURE 7, shows the basic structure of a mobile station according to a second exemplary embodiment
  • FIGURE 12 starting from FIGURE 6, the basic structure of a base station according to a third embodiment
  • FIGURE 13 shows the basic structure of a mobile station according to a third exemplary embodiment
  • FIGURE 14 starting from FIGURE 6, the basic structure of a base station according to a fourth embodiment.
  • FIGURES 8 and 9 show the basic structure of the base station BTS1, BTS2 (FIGURE 8) and the mobile station, respectively, based on FIGURES 6 and 7
  • FIGURE 9 The main difference between the respective structure according to FIGURES 6 and 7 and the respective Structure according to FIGURES 8 and 9 consists in that a modified channel estimator KS 'is used in the respective structure according to FIGURES 8 and 9.
  • This channel estimator KS ' is designed such that, for example, starting from FIGURE 5, a system-internal participant at the mobile station MS1 ... MS5 and / or another system-internal participant at the mobile station MS1 ...
  • MS5 internal connection
  • a system-external participant in higher-level PST network external connection
  • receives messages intended for it in the case of TDMA-based telecommunication systems, a subscriber to whom, for example, the time slot "n" of a TDMA frame is assigned
  • also messages that are intended for other subscribers and in the same transmission direction are transmitted (in the case of TDMA-based telecommunications systems, another subscriber to whom, for example, the time slot “n-1” of a TDMA frame is assigned) are used for channel estimation.
  • BER bit energy and noise power density
  • FIGURES 10 and 11 show, according to a second exemplary embodiment, starting from FIGURES 6 and 7, the basic structure of the base station BTS1, BTS2 (FIGURE 10) and the mobile station MT1 ... MT5 (FIGURE 11).
  • the essential difference between the respective structure according to FIGURES 6 and 7 and the respective structure according to FIGURES 10 and 11 is that an evaluation device AWE is provided in the respective structure according to FIGURES 10 and 11.
  • This evaluation device AWE is bidirectionally assigned to or connected to the channel estimator KS and the control unit STE or the control and signaling unit STSE and forms special channel estimation means with these.
  • channel estimation means differ from the respective channel estimator in that, by means of the evaluation device AWE controlled by the control unit STE or the control and signaling unit STSE, two of the respective channel estimators KS co ⁇ > ⁇ _ ⁇ > ⁇ > ⁇ o (- ⁇ o C ⁇ o C ⁇
EP98955359A 1997-10-27 1998-09-30 Übertragungskanalschätzung in telekommunikationssystemen mit drahtloser telekommunikation Ceased EP1038359A2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19747369A DE19747369A1 (de) 1997-10-27 1997-10-27 Übertragungskanalschätzung in Telekommunikationssystemen mit drahtloser Telekommunikation
DE19747369 1997-10-27
PCT/DE1998/002894 WO1999022454A2 (de) 1997-10-27 1998-09-30 Übertragungskanalschätzung in telekommunikationssystemen mit drahtloser telekommunikation

Publications (1)

Publication Number Publication Date
EP1038359A2 true EP1038359A2 (de) 2000-09-27

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EP98955359A Ceased EP1038359A2 (de) 1997-10-27 1998-09-30 Übertragungskanalschätzung in telekommunikationssystemen mit drahtloser telekommunikation

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Country Link
US (1) US6795427B1 (pt)
EP (1) EP1038359A2 (pt)
JP (1) JP2001522157A (pt)
KR (1) KR20010031509A (pt)
CN (1) CN1153370C (pt)
AU (1) AU1223899A (pt)
BR (1) BR9813306A (pt)
CA (1) CA2308026A1 (pt)
DE (1) DE19747369A1 (pt)
RU (1) RU2235430C2 (pt)
WO (1) WO1999022454A2 (pt)

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AU1223899A (en) 1999-05-17
RU2235430C2 (ru) 2004-08-27
KR20010031509A (ko) 2001-04-16
WO1999022454A3 (de) 1999-10-07
CN1278376A (zh) 2000-12-27
WO1999022454A2 (de) 1999-05-06
BR9813306A (pt) 2000-11-28
CN1153370C (zh) 2004-06-09
JP2001522157A (ja) 2001-11-13
CA2308026A1 (en) 1999-05-06
US6795427B1 (en) 2004-09-21
DE19747369A1 (de) 1999-05-06

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