Patent ID: 6735263
Filing Date: 2004-05-11
Classification: G01S,H04L

Abstract:
A system for coherent detection and demodulation of a FDMA signal being a superposition of amplitude modulated carriers, the system comprising a digital coherent detector for receiving said FDMA electromagnetic signal, processing the signal and extracting a signed envelope of at least one amplitude modulated carrier, the detector comprising:(i) a transducer for transforming said FDMA signal into analog electric signal; (ii) a front-end electronics for receiving said analog electric signal and providing pre-amplification and pre-filtering of the input signal; (iii) an analog to digital converter (ADC) for translating the electric signal coming after said front-end electronics into digitized signal data sampled at fixed ADC sampling intervals; and (iv) a digital signal processor (DSP) for processing the digitized signal data and providing a real-time estimate of the signed envelope of at least one amplitude modulated carrier, the system synchronized by a synchronization signal delivering initial phase information to the DSP for estimation of the envelope sign.