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WO1999065166A3 - Wireless telecommunications system employing a coherently modulated time slot having differentially modulated pilot symbols - Google Patents

Wireless telecommunications system employing a coherently modulated time slot having differentially modulated pilot symbols Download PDF

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Publication number
WO1999065166A3
WO1999065166A3 PCT/EP1999/003954 EP9903954W WO9965166A3 WO 1999065166 A3 WO1999065166 A3 WO 1999065166A3 EP 9903954 W EP9903954 W EP 9903954W WO 9965166 A3 WO9965166 A3 WO 9965166A3
Authority
WO
WIPO (PCT)
Prior art keywords
time slot
modulated
differentially
coherently
dqpsk
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/EP1999/003954
Other languages
French (fr)
Other versions
WO1999065166A2 (en
Inventor
Risto Paatelma
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 Oyj
Original Assignee
Nokia Mobile Phones Ltd
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 Nokia Mobile Phones Ltd filed Critical Nokia Mobile Phones Ltd
Priority to AU52797/99A priority Critical patent/AU5279799A/en
Publication of WO1999065166A2 publication Critical patent/WO1999065166A2/en
Publication of WO1999065166A3 publication Critical patent/WO1999065166A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method operates a wireless mobile or user station to receive a time slot sent through a radio channel from a transmitter, the time slot being coherently modulated except for a portion that contains a predetermined symbol sequence that is differentially modulated. A next step differentially detects the portion of the received time slot that contains the predetermined symbol sequence. A further step of the method operates to perform a channel estimation for a coherent detector that is used to detect other portions of the time slot. By example, the predetermined symbol sequence is modulated in accordance with one of Differential Quadrature Phase Shift Keying (DQPSK), Differential 8 Phase Shift Keying (D8PSK), π/4-shifted DQPSK, or 16 level DQPSK. In a preferred embodiment of the invention the portion of the time slot that is differentially modulated is a CDVCC/PILOT field, while the data fields and other fields are modulated using 8PSK.
PCT/EP1999/003954 1998-06-08 1999-06-08 Wireless telecommunications system employing a coherently modulated time slot having differentially modulated pilot symbols Ceased WO1999065166A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU52797/99A AU5279799A (en) 1998-06-08 1999-06-08 Wireless telecommunications system employing a coherently modulated time slot having a differentially modulated field (cdvcc) providing pilot symbols useful forchannel estimation

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US8839698P 1998-06-08 1998-06-08
US60/088,396 1998-06-08
US32613499A 1999-06-04 1999-06-04
US09/326,134 1999-06-04

Publications (2)

Publication Number Publication Date
WO1999065166A2 WO1999065166A2 (en) 1999-12-16
WO1999065166A3 true WO1999065166A3 (en) 2000-01-20

Family

ID=26778607

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/003954 Ceased WO1999065166A2 (en) 1998-06-08 1999-06-08 Wireless telecommunications system employing a coherently modulated time slot having differentially modulated pilot symbols

Country Status (2)

Country Link
AU (1) AU5279799A (en)
WO (1) WO1999065166A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0116017D0 (en) * 2001-06-29 2001-08-22 Simoco Digital Systems Ltd Communications systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526833A2 (en) * 1991-07-30 1993-02-10 Nec Corporation Carrier frequency error detector capable of accurately detecting a carrier frequency error
WO1995030289A2 (en) * 1994-04-29 1995-11-09 Telefonaktiebolaget Lm Ericsson A direct sequence cdma coherent uplink detector
WO1996016492A1 (en) * 1994-11-23 1996-05-30 At & T Wireless Services, Inc. System and method for wireless transmission of digital data using differentially encoded pilot words

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526833A2 (en) * 1991-07-30 1993-02-10 Nec Corporation Carrier frequency error detector capable of accurately detecting a carrier frequency error
WO1995030289A2 (en) * 1994-04-29 1995-11-09 Telefonaktiebolaget Lm Ericsson A direct sequence cdma coherent uplink detector
WO1996016492A1 (en) * 1994-11-23 1996-05-30 At & T Wireless Services, Inc. System and method for wireless transmission of digital data using differentially encoded pilot words

Also Published As

Publication number Publication date
AU5279799A (en) 1999-12-30
WO1999065166A2 (en) 1999-12-16

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