Patent ID: 6970496
Filing Date: 2005-11-29
Classification: H04B,H04L

Abstract:
1. A direct sequence spread Spectrum radio frequency (RF) modem, comprising: a pulse generator adopted to generate a shaped pulse from an Intermediate Frequency (IF) oscillator signal having an IF frequency, 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 pulse; a transmitter circuit including an upconverter for mixing said spread pulse with a local oscillator (LO) signal having an LO frequency so as 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 reactivated 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.