EP1869798A1 - Einrichtung und verfahren zur vergrösserung der robustheit oder der kapazität drahtloser kommunikationssysteme - Google Patents

Einrichtung und verfahren zur vergrösserung der robustheit oder der kapazität drahtloser kommunikationssysteme

Info

Publication number
EP1869798A1
EP1869798A1 EP06725501A EP06725501A EP1869798A1 EP 1869798 A1 EP1869798 A1 EP 1869798A1 EP 06725501 A EP06725501 A EP 06725501A EP 06725501 A EP06725501 A EP 06725501A EP 1869798 A1 EP1869798 A1 EP 1869798A1
Authority
EP
European Patent Office
Prior art keywords
users
user
frequency
increasing
capacity
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Withdrawn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
EP06725501A
Other languages
English (en)
French (fr)
Inventor
Marc Chenu-Tournier
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.)
Thales SA
Original Assignee
Thales SA
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 Thales SA filed Critical Thales SA
Publication of EP1869798A1 publication Critical patent/EP1869798A1/de
Withdrawn legal-status Critical Current

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
    • H04B7/0613—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
    • H04B7/0667—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 delayed versions of same signal
    • 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
    • H04B7/12—Frequency diversity
    • 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
    • H04B7/068—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 space frequency diversity

Definitions

  • the invention particularly relates to a method and a device for increasing the capacity of wireless telecommunications systems, in particular by providing diversity to a reception system.
  • diversity is understood as the ability to use multiple copies of the same transmitted signal. Each copy has been degraded or distorted (channel or interference) independent.
  • the reception diversity notably makes it possible to greatly increase the performance of the receiver and therefore the robustness or the capacity of the telecommunications link.
  • reception and / or emission sensor networks is an effective means when the processing adapted to the transmission and / or reception is implemented.
  • the invention is based in particular on a new approach by transmitting simultaneously through several propagation channels, the superposition of the messages to be transmitted.
  • the invention relates to a method for increasing the capacity of a wireless communications system comprising at least two users Ui and U 2 communicating by means of at least one frequency band Fi, F 2, characterized in that the flow of information Si (t) of the first user Ui and the information flow s 2 (t) of the second user U 2 are traveling in at least one and the same frequency band.
  • the method according to the invention makes it possible in particular to increase the performance of the demodulation in a system compared to the conventional system, a band, a flow.
  • One of the advantages of the present invention is that it allows the receiver to benefit from additional diversity compared to the conventional case where each transmitter exclusively uses the frequency band which has been dedicated to it.
  • FIG. 1 is a schematic diagram of the method according to the invention
  • FIG. 2 schematizes a device architecture for implementing the invention
  • Figure 1 shows schematically the steps implemented in the case of a system using two frequencies. This can be extended to any system including a number of frequencies and users greater than 2.
  • the system represented in FIG. 2 comprises several users Ui emitting information flows across several frequency bands, a receiver R comprising in particular a processor P adapted to implement the steps of the method according to the invention.
  • the user Ui transmits in a frequency band Fi and the user U 2 in a frequency band F 2 .
  • the method includes transmitting the flows Si (t) and s 2 (t) of each of the users on each of the frequency bands.
  • the sum of the two information flows or flows of interest coming from the two users propagates.
  • a user transmits with a power 2 times lower, which helps to reduce the transmission power to avoid increasing the power transmitted in a cell.
  • the signals received by the receiver express themselves:
  • each transmitter emits with a lower power than it uses in the case a band, a frequency.
  • One of the interests of the process is to bring what the skilled person calls diversity to the receiver. In the case of multi-path degraded transmission channels, this diversity can improve the performance of reception systems without consuming more bandwidth or increasing power.
  • the method according to the invention also applies for downlinks. For example, when it is desired to transmit to several users from an access point, it is possible to bring diversity to the receiver.
  • the system comprises three users referenced by their signals Si, S 2 , S 3 to which it is desired to transmit information and three frequencies, on each frequency F 1 , F 2 and F 3 , a pair of signals ⁇ si, s 2 ) or ⁇ si, s 3 ) or ⁇ s 2 , s 3 ) is transmitted.
  • the demodulation can be simplified when the number of users simultaneously using the same frequency band is not too high.
  • a receiver type RAKE filter adapted to the channel and the code
  • the method also applies to another type of access, by modulation.
  • a downlink rather than using a frequency or time slot to transmit streams to a user, it is possible to share a multilevel modulation between different users.
  • the dedicated stream is transmitted on the real part for, for example, the even bits and the imaginary part are dedicated to another user.
  • one of the axes serves to transmit the odd bits of the first user and the other axis serves the second user.
  • fewer channels are used than users.
  • the choice of channels to use is based on their statistical independence.
  • FIG. 2 represents performance curves obtained by implementing the method according to the invention.
  • the simulation parameters used are:
  • the system uses Orthogonal frequency-division multiplexing (OFDM) modulation with a multiple access system that is either frequency or time.
  • OFDM Orthogonal frequency-division multiplexing
  • different transmitters can share this resource by simultaneously communicating with the constraint that the receiving system embeds the method of separation of multiple streams.
  • the method has been implemented for an OFDM modulation using 64 subcarrier, of which only 52 are used to transmit data.
  • the system uses an OFDM modulation with a multiple access system either frequency or time.
  • different transmitters can share this resource by simultaneously communicating with the constraint that the receiving system embeds the method of separation of multiple streams.
  • the performances of the process are simulated and compared to a process which does not use the principle of the invention where the process is not implemented.
  • This study focuses on the upstream link and the technique to separate the different flows of different users is a maximum likelihood algorithm with flexible output.
  • the modulation used is a BSPK
  • the propagation channels are assumed to be known and independent between the users and the resources (time or frequency).
  • the parameters of the waveform are those of the 802.11a standard whose aspects of corrective coding.
  • the transmitted total powers remain constant whatever the transmission method used in order to obtain relevant comparisons.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)
EP06725501A 2005-04-01 2006-03-31 Einrichtung und verfahren zur vergrösserung der robustheit oder der kapazität drahtloser kommunikationssysteme Withdrawn EP1869798A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0503179A FR2884085B1 (fr) 2005-04-01 2005-04-01 Dispositif et procede pour accroitre la robustesse ou la capacite des systemes de communication sans fil
PCT/EP2006/061255 WO2006103295A1 (fr) 2005-04-01 2006-03-31 Dispositif et procede pour accroitre la robustesse ou la capacite des systemes de communication sans fil

Publications (1)

Publication Number Publication Date
EP1869798A1 true EP1869798A1 (de) 2007-12-26

Family

ID=35429207

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06725501A Withdrawn EP1869798A1 (de) 2005-04-01 2006-03-31 Einrichtung und verfahren zur vergrösserung der robustheit oder der kapazität drahtloser kommunikationssysteme

Country Status (5)

Country Link
US (1) US20090219898A1 (de)
EP (1) EP1869798A1 (de)
CN (1) CN101189806A (de)
FR (1) FR2884085B1 (de)
WO (1) WO2006103295A1 (de)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5542115A (en) * 1994-06-24 1996-07-30 Pioneer Tech Development Limited Paging method and apparatus
US6122482A (en) * 1995-02-22 2000-09-19 Global Communications, Inc. Satellite broadcast receiving and distribution system
SE517380C2 (sv) * 2000-10-12 2002-06-04 Ericsson Telefon Ab L M Metod och anordning för tillvaratagande av frekvensutrymme i ett trådlöst kommunikationssystem med osymmetrisk trafikbelastning
KR20030056243A (ko) * 2001-12-27 2003-07-04 삼성전기주식회사 트리플렉서 회로 및 이를 구현한 적층칩형 트리플렉서
TWI280687B (en) * 2002-08-09 2007-05-01 Wistron Neweb Corp Multi-patch antenna which can transmit radio signals with two frequencies
US7508798B2 (en) * 2002-12-16 2009-03-24 Nortel Networks Limited Virtual mimo communication system
JP2005341531A (ja) * 2004-04-27 2005-12-08 Matsushita Electric Ind Co Ltd 無線通信システム及び無線局
KR20050120441A (ko) * 2004-06-18 2005-12-22 삼성전자주식회사 다중 안테나를 사용하는 이동통신 시스템의 송신다이버시티 장치 및 방법
US7751372B2 (en) * 2005-09-23 2010-07-06 Peter Monsen Technique for adaptive data rate communication over fading dispersive channels

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006103295A1 *

Also Published As

Publication number Publication date
FR2884085B1 (fr) 2014-08-15
US20090219898A1 (en) 2009-09-03
CN101189806A (zh) 2008-05-28
FR2884085A1 (fr) 2006-10-06
WO2006103295A1 (fr) 2006-10-05

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