Mobile satellite phone system incorporating symmetrical and non-symmetrical waveform modes
First Claim
Patent Images
1. A satellite communications system, comprising:
- a satellite; and
a plurality of mobile communication devices, wherein the system operates in a first mode, in which each device transmits signals to the satellite at a first carrier bandwidth and receives signals from the satellite at a second carrier bandwidth, and selectively operates in a second mode, in which each device transmits signals to the satellite and receives signals from the satellite at the first carrier bandwidth.
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Abstract
An improved multi-mode telephone for use in an improved satellite communication method and system. The telephone is selectively capable of receiving signals at different carrier bandwidths, such that a satellite communication system having a non-symmetrical air interface can be easily implemented without requiring rate conversion hardware or software at the satellite for direct mobile-to-mobile communications.
32 Citations
13 Claims
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1. A satellite communications system, comprising:
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a satellite; and
a plurality of mobile communication devices, wherein the system operates in a first mode, in which each device transmits signals to the satellite at a first carrier bandwidth and receives signals from the satellite at a second carrier bandwidth, and selectively operates in a second mode, in which each device transmits signals to the satellite and receives signals from the satellite at the first carrier bandwidth. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for exchanging communication signals in a communication system, comprising the steps of:
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establishing, in a first mode of operation, a first communication link between a first communication device, a satellite, a control station associated with the satellite, and a second communication device, the first communication device transmitting signals to the satellite at a first carrier bandwidth and the second communication device receiving signals at a second carrier bandwidth;
establishing, in a second mode of operation, a second communication link between the first communication device, the satellite, and a second communication device, the first communication device transmitting signals to the satellite at the first carrier bandwidth and the second communication device receiving signals from the satellite at the first carrier bandwidth. - View Dependent Claims (9, 10, 11, 12, 13)
filtering, in the second communication device, the received signals over the first communication link in a first filter; and
filtering, in the second communication device, the received signals over the second communication link in a second filter.
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12. The method of claim 8, wherein the first carrier bandwidth is approximately 50 kHz, and the second carrier bandwidth is approximately 200 kHz.
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13. The method of claim 8, further comprising the steps of:
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selecting between the first mode and the second mode; and
providing call setup information to direct the communication devices to receive signals at the first carrier bandwidth or at the second carrier bandwidth.
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Specification