Global Patent Index - EP 1243112 A1

EP 1243112 A1 2002-09-25 - METHOD FOR BLIND MODULATION DETECTION

Title (en)

METHOD FOR BLIND MODULATION DETECTION

Title (de)

VERFAHREN ZUR BLINDEN MODULATIONSERKENNUNG

Title (fr)

PROCEDE DE DETECTION AVEUGLE DE MODULATION

Publication

EP 1243112 A1 (EN)

Application

EP 00974742 A

Priority

  • IB 0001749 W
  • US 47624799 A

Abstract (en)

[origin: WO0152493A1] A burst of data modulated according to one modulation scheme is transmitted from the transmitter as a radio signal. Each burst contains a predefined training sequence, which may differ from burst to burst, but is known by the receiver. The receiver back-rotates the portion of the received signal corresponding to the training sequence by all available modulation schemes. Using mathematical modeling, the magnitude of the errors calculated according to each modulation scheme are compared and the modulation scheme selected is the scheme which yields the smallest error. The data in the burst may then be demodulated and processed according to the selected modulated scheme. This method has particular applicability to a GSM system in which both GMSK and EDGE modulation schemes are used but is also applicable to modulation schemes generally where the signals are modulated by a rotation.

IPC 1-7 (main, further and additional classification)

H04L 27/00; H04L 25/02

IPC 8 full level (invention and additional information)

H04L 25/02 (2006.01); H04L 27/00 (2006.01)

CPC (invention and additional information)

H04L 27/2067 (2013.01); H04L 25/0212 (2013.01); H04L 25/0228 (2013.01); H04L 27/0012 (2013.01); H04L 27/2017 (2013.01)

Citation (search report)

See references of WO 0152493A1

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

EPO simple patent family

WO 0152493 A1 20010719; AU 1295401 A 20010724; EP 1243112 A1 20020925

INPADOC legal status


2004-12-08 [18D] DEEMED TO BE WITHDRAWN

- Effective date: 20040602

2002-09-25 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020627

2002-09-25 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

2002-09-25 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI