Patent ID: 6151313
Filing Date: 2000-11-21
Classification: H04B,H04L

Abstract:
Demodulator apparatus for processing in a hub receiver digital signals from identical plural transmitters, each of which uses the same pair of spreading codes, the demodulator apparatus comprising a receiver having an input for receiving spread spectrum data packet signals, each signal having the same first and the same second spreading sequences from the identical plural transmitters, and first and second mixers connected to the input, an oscillator connected to the first mixer, and a phase shifter connected to the oscillator and to the second mixer for mixing an oscillator frequency and a phase shifted oscillator frequency and producing respectively in-phase chip signals and quadrature chip signals, first and second low pass filters respectively connected to the first and second mixers for respectively producing in phase filtered chip signals and quadrature filtered chip signals, and a first despreader connected to the first low pass filter, and a second despreader connected to the second low pass filter, for respectively despreading the in phase and quadrature chip signals of identical multiple transmitters and producing despread in phase and quadrature chip signals.