×

RF MODEM UTILIZING SAW DEVICE WITH PULSE SHAPING AND PROGRAMMABLE FREQUENCY SYNTHESIZER

  • US 20070291823A1
  • Filed: 06/14/2006
  • Published: 12/20/2007
  • Est. Priority Date: 06/14/2006
  • Status: Active Grant
First Claim
Patent Images

1. A direct sequence spread spectrum radio frequency (RF) modem, comprising:

  • a programmable frequency synthesizer adapted to generate an interrogating pulse and a local oscillator (LO) signal, the frequency of said interrogating pulse and LO signals determined in accordance with a frequency control signal;

    a pulse generator adapted to generate a shaped pulse from said interrogating pulse, said pulse generator comprising a first pulse shaping circuit adapted to shape the contour of said shaped pulse;

    a pulse spreader adapted to spread said shaped pulse with a spreading code sequence waveform so as to generate a spread shaped pulse;

    a transmitter circuit including an upconverter for mixing said spread shaped pulse with said local oscillator (LO) signal having an LO frequency to generate a spread spectrum transmission signal at an RF frequency;

    a receiver circuit including a downconverter for mixing a received signal with said LO signal so as to generate a received spread pulse at said IF frequency;

    a correlator adapted to de-spread said received spread pulse in accordance with said code sequence so as to generate a correlator signal; and

    a detector adapted to generate an output signal in response to said correlator signal.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×