Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-06-14
2009-11-17
Kim, Kevin Y (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S238000, C375S239000, C370S205000, C329S313000
Reexamination Certificate
active
07620095
ABSTRACT:
A bidirectional direct sequence spread spectrum half-duplex RF modem. that can be applied to transmit and receive numerous types of analog and digital pulse modulation. The modem incorporates a SAW based correlator for performing the spreading and de-spreading functions in the transmitter and receiver. A programmable frequency synthesizer provides the frequency source for various signals in the modem including the local oscillator (LO), IF interrogating pulse and clock signals. An upconverter/downconverter provides frequency translation to the desired frequency band. Pulse gating and interrogating pulse shaping are employed to reduce the spectral side bands of the transmitted spread pulse. The RF modem operates as an analog or digital pulse transmitter and receiver. It is adapted to be generic and is versatile enough to be used in many different types of data communication systems, such as OOK, PWM and PPM. The RF modem can be used as the physical (PHY) layer in a layered communication system such as the ISO OSI communication stack. In an alternative embodiment, the transmission bit rate is increased by using a plurality of correlators wherein each is configured with a unique function (i.e., code) that is orthogonal to the other functions.
REFERENCES:
patent: 5892792 (1999-04-01), Walley
patent: 6088347 (2000-07-01), Minn et al.
patent: 6535545 (2003-03-01), Ben-Bassat et al.
patent: 6757334 (2004-06-01), Feher
patent: 6970496 (2005-11-01), Ben-Bassat et al.
patent: 2004/0156465 (2004-08-01), Schmandt
Chipcon SmartRF CC2400 Datasheet; Chipcon Inc., version 1.2, Feb. 5, 2004.
Nordic nRF24Z1 Datasheet, Nordic Semiconductor, version 3.1, Jun. 2006.
Kim Kevin Y
Vishay Intertechnology Inc
Zaretsky Howard
Zaretsky Patent Group PC
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