The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 22, 2005
Filed:
Dec. 30, 1998
Jürgen Kockmann, Gronau, DE;
Uwe Sydon, Düsseldorf, DE;
Hermann-josef Terglane, Heek, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
The present invention relates to a radio inter-face for a cordless small system using the 2.4 GHz ISM band. According to the present invention, a transmission system having a fixed station () and at least one mobile station () is provided for this purpose, the fixed station () and the mobile station () each having devices (RF modules) in order to transmit the data in time slots using a frequency-division multiplex method (FDMA) and a time-division multiplex method (TDMA), and with time division duplexing (TDD). As is known from DECT Standard, the data are modulated onto a carrier frequency (f) using a GMSK modulation method. The RF modules () in the fixed station () and, respectively, the mobile station () are in this case designed such that the carrier frequency (f) is changed after a predetermined time period, which may correspond, for example, to the time duration of a time slot or of a transmission frame. A transmission frame in this case contains 16 time slots.