Patent ID: 6108317
Filing Date: 2000-08-22
Classification: H04B,H04J

Abstract:
In a satellite communications system, a synchronous satellite terminal (ST) for receiving outbound communication signals from a hub and for transmitting inbound communication signals to the hub, the ST comprising:a chip rate clock generator that recovers a bit timing clock signal received by the satellite terminal and generates a chip rate clock signal;a pseudo-noise (PN) code generator that receives the chip rate clock signal and a bit rate clock signal, and generates a cyclic shift inphase (I) PN code sequence and a cyclic shift quadrature (Q) PN code sequence;a differential encoder that differentially encodes data;a spreader that utilizes the I and Q PN code sequences to spread the encoded data; anda phase-shift keying modulator that receives the spread data and modulates a carrier with the spread data for transmission to the hub.