| 摘要 |
<p>PURPOSE:To improve the slot utilizing efficiency while keeping counter- interference performance by adopting a single spread code so as to reduce a synchronizing signal for communication. CONSTITUTION:A demodulated data string is inputted to a frame synchronization circuit 4, in which frame synchronization is established. A frame pattern is in use to activate a VSAT station slot timing generating circuit 6, which generates a slot timing. The slot timing is inputted to a spread code generator 3, in which the generation of a spread code is initialized to a prescribed value at the start point of the slot at all times in the slot timing. The spread signal reset for each slot is inputted to a spread device 2, which diffuses the modulation signal. Thus, the VSAT station sends the spread signal to a center station in the intermittent mode. A demodulation means in the center station uses same spectrum spread to demodulate the signal from a start point of a time slot of a data signal thereby reproducing in-band data.</p> |
