| 摘要 |
A satellite communications system ( 10 ) includes a hub ( 14 ), a satellite ( 32 ), and any number of remote terminals ( 16 ). Each remote terminal ( 16 ) includes a remote receiver ( 38 ), a monitor ( 40 ), and a network access controller ( 42 ). Each remote receiver ( 38 ) is configured to receive and down convert the system's entire spectrum of interest from which channels are accessed by the remote terminals ( 16 ). The monitors ( 40 ) independently perform FFT processes over this entire spectrum, but at a low frequency resolution which is no higher than needed to distinguish channels. Based on these spectral analyses, uplink/inbound channels are independently selected by the network access controllers ( 42 ) at each remote terminal ( 16 ). Remote terminals ( 16 ) immediately transmit data to the hub ( 14 ) as soon as they select an uplink/inbound channel.
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