Multiplex communications – Duplex – Communication over free space
Reexamination Certificate
2005-11-22
2005-11-22
Ton, Dang (Department: 2666)
Multiplex communications
Duplex
Communication over free space
C370S294000, C370S295000, C370S330000, C370S343000
Reexamination Certificate
active
06967934
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 (1) and at least one mobile station (2, 3) is provided for this purpose, the fixed station (1) and the mobile station (2) each having devices (RF modules4, 5) 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 (fx) using a GMSK modulation method. The RF modules (4, 5) in the fixed station (1) and, respectively, the mobile station (2) are in this case designed such that the carrier frequency (fx) 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.
REFERENCES:
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patent: 6411611 (2002-06-01), van der Tuijn
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DECT/GAP standard (Digital European Cordless Telecommunication; cf. (1): Nachrichtentechnik Elektronik 42 (1992) Jan./Feb. No. 1, Berlin, DE; U. Pilger “Struktur des DECT-Standards,” pp. 23-29.
IEEE Personal Communications, 2ndQuarter, (1994), No. 2, New York, Phillip D. Rasky, et al. “Slow Frequency—Hop TDMA/CDMA for Macrocellular Personal Communications”, pp. 26-35.
Kockmann Jürgen
Sydon Uwe
Terglane Hermann-Josef
Bell Boyd & Lloyd LLC
Hom Shick
Siemens Aktiengesellschaft
Ton Dang
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