GB2383926B - OFDM system with simple terminals - Google Patents

OFDM system with simple terminals

Info

Publication number
GB2383926B
GB2383926B GB0304926A GB0304926A GB2383926B GB 2383926 B GB2383926 B GB 2383926B GB 0304926 A GB0304926 A GB 0304926A GB 0304926 A GB0304926 A GB 0304926A GB 2383926 B GB2383926 B GB 2383926B
Authority
GB
United Kingdom
Prior art keywords
ofdm
base station
terminal
codes
detected
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.)
Expired - Fee Related
Application number
GB0304926A
Other versions
GB2383926A (en
GB0304926D0 (en
Inventor
Grant Mcgibney
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.)
Telecommunications Res Labs
Original Assignee
Telecommunications Res Labs
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
Priority claimed from CA002313672A external-priority patent/CA2313672A1/en
Application filed by Telecommunications Res Labs filed Critical Telecommunications Res Labs
Publication of GB0304926D0 publication Critical patent/GB0304926D0/en
Publication of GB2383926A publication Critical patent/GB2383926A/en
Application granted granted Critical
Publication of GB2383926B publication Critical patent/GB2383926B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals, e.g. multi-user orthogonal frequency division multiple access [OFDMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure

Landscapes

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

Abstract

This invention is a wireless network based on orthogonal frequency division multiplexing (OFDM). In a conventional OFDM system, the signal processing hardware is divided equally between the base station and the terminal. In this invention, most of the complex signal processing hardware is shifted to the base station, making the terminal a simpler and more power-efficient device. To send information to the base station, the terminal transmits a series of QPSK symbols that make up an OFDM-code. The bode is designed to distribute the signal's energy into a number of OFDM sub-carriers which can be detected and combined within the base station's OFDM receiver. Other users transmit the same OFDM-codes within the same bandwidth and at the same time, but with slightly offset carrier frequencies. Because of the nature of OFDM, the codes from different users remain orthogonal, even in a multipath radio environment. OFDM signals transmitted from the base station are detected at the terminal using a decimator-accumulator structure.
GB0304926A 2000-07-07 2001-06-22 OFDM system with simple terminals Expired - Fee Related GB2383926B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002313672A CA2313672A1 (en) 2000-07-07 2000-07-07 Ofdm system with simple terminals
GB0115277A GB2369012B (en) 2000-07-07 2001-06-22 OFDM system with simple terminals

Publications (3)

Publication Number Publication Date
GB0304926D0 GB0304926D0 (en) 2003-04-09
GB2383926A GB2383926A (en) 2003-07-09
GB2383926B true GB2383926B (en) 2003-10-08

Family

ID=25681938

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0304926A Expired - Fee Related GB2383926B (en) 2000-07-07 2001-06-22 OFDM system with simple terminals

Country Status (1)

Country Link
GB (1) GB2383926B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2418802B (en) * 2004-09-30 2009-03-18 Samsung Electronics Co Ltd Multi carrier communications
CN102036134A (en) * 2011-01-18 2011-04-27 北京邮电大学 Converged optical access network system and method based on OFDM

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0702466A2 (en) * 1994-09-14 1996-03-20 AT&T GLOBAL INFORMATION SOLUTIONS INTERNATIONAL INC. Reduction of peak to average power ratio for OFDM

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0702466A2 (en) * 1994-09-14 1996-03-20 AT&T GLOBAL INFORMATION SOLUTIONS INTERNATIONAL INC. Reduction of peak to average power ratio for OFDM

Also Published As

Publication number Publication date
GB2383926A (en) 2003-07-09
GB0304926D0 (en) 2003-04-09

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050622