System and Method for Multiple Access Control in a Communications System
First Claim
1. :
- In a communications system, a method of accessing channels comprising;
receiving a broadband signal occupying a predetermined portion of the electromagnetic spectrum and including a plurality of downlink channels;
identifying a portion of said spectrum of said broadband signal in which power is below a predetermined threshold;
translating said portion of said spectrum of said broadband signal in which power is below said predetermined threshold into an identity of an uplink channel; and
transmitting a communication using said uplink channel identified in said translating activity.
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Accused Products
Abstract
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.
22 Citations
13 Claims
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1. :
- In a communications system, a method of accessing channels comprising;
receiving a broadband signal occupying a predetermined portion of the electromagnetic spectrum and including a plurality of downlink channels; identifying a portion of said spectrum of said broadband signal in which power is below a predetermined threshold; translating said portion of said spectrum of said broadband signal in which power is below said predetermined threshold into an identity of an uplink channel; and transmitting a communication using said uplink channel identified in said translating activity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- In a communications system, a method of accessing channels comprising;
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11. :
- A communications system comprising;
a hub; and a plurality of remote terminals wherein each of said remote terminals is configured to independently receive a broadband signal occupying a predetermined portion of the electromagnetic spectrum, to identify a portion of said spectrum of said broadband signal in which power is below a predetermined threshold, to translate said portion of said spectrum of said broadband signal in which power is below said predetermined threshold into an identity of an uplink channel, and to transmit toward said hub said uplink channel; wherein each of said remote terminals includes a receiver and a monitor, each receiver is configured to sample said broadband signal to form a block of samples, and each monitor is configured to perform a Fourier transform on said block of samples. - View Dependent Claims (12, 13)
- A communications system comprising;
Specification