(19)

(11)

EP 1 461 865 A1

(12)

(43) Date of publication: 29.09.2004 Bulletin 2004/40 (21) Application number: 03700333.2 (22) Date of filing: 03.01.2003

(51) International Patent Classification (IPC)7: H03L 7/197, H04B 1/707 (86) International application number: PCT/GB2003/000008 (87) International publication number: WO 2003/061132 (24.07.2003 Gazette 2003/30)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR Designated Extension States: AL LT LV MK RO (30) Priority: 04.01.2002 GB 0200093 (71) Applicant: ROKE MANOR RESEARCH LIMITED Romsey,Hants SO51 0ZN (GB)	(72) Inventor: Hulbert, Anthony Peter Southampton,Hampshire SO16 3DF (GB) (74) Representative: Payne, Janice Julia  Siemens AG,Postfach 22 16 34 80506 München 80506 München (DE)