| 摘要 |
Controlling a spot-beam satellite which provides coverage in the form of a cluster of spatial beams each covering a respective area on the earth's surface, and each serving one or more client systems in the respective area: using a first one of the beams to transmit a first signal comprising a sequence of first symbols, by modulating a first carrier; using a second one of the beams to transmit a second signal comprising a sequence of second symbols, by modulating a second carrier; wherein the symbols of the first beam are aligned or at least overlap in time with the symbols of the second beam, and the first and second carrier share a same carrier frequency or at least overlapping frequency band; and wherein the method comprises controlling the first signal to be out-of-phase relative to the second signal. This may be accomplished by offsetting the symbols of the respective signals in time. Signal modulation may be n-fold phase shift keying (PSK), with the phase offset between the signals being half the phase shift used for modulation. |
