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1. WO2020112517 - SYSTEM AND METHOD OF SATELLITE COMMUNICATION

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[ EN ]

CLAIMS

What is claimed is:

1. An apparatus comprising:

one or more optical ground terminals comprising at least a forward channel transmitter (TX) and at least a return channel receiver (RX), wherein

the forward channel TX is configured to:

receive a plurality of data frames at a data-link layer;

encode the plurality of received data frames by a data-link layer encoder, wherein the data-link layer encoder is a packet erasure encoder using a forward error correction (FEC) code;

distribute the plurality of encoded data frames to a plurality of data channels by a distributor, forward channel data is generated by the plurality of data channels with respect to the encoded data frames; and

embed the forward channel data to one or more uplink beams by a plurality of optical modems in the plurality of data channels, respectively, wherein the one or more uplink beams are amplified by a plurality of optical power amplifier (PA), and the one or more uplink beams are transmitted via multiple forward channels through air/vacuum.

2. The apparatus of Claim 1, wherein the one or more uplink beams are received by a counterpart forward channel receiver (RX) in a respective optical space terminal, and the respective optical space terminal is paired with the one of the optical ground terminals for optical communication.

3. The apparatus of Claim 1, wherein the forward channel TX further comprises a plurality of optical low noise amplifier (LNA) configured to amplify the one or more uplink beams, physical layer FEC encoders, channel interleavers, and modulators in the plurality of data channels respectively.

4. The apparatus of Claim 1, wherein the return channel RX is configured to:

receive one or more downlink beams via a return channel through air/vacuum by one of the data channels, wherein the one of the data channels is selected by a selector; extract return channel data from the one or more downlink beams by an optical modem in the one of the data channels, wherein the one or more downlink beams are amplified by an optical power amplifier (PA) in the one of the data channels, and encoded data frames are generated by the one of the data channels with respect to the return channel data;

at a data-link layer, decode the encoded data frames by a data-link layer decoder, wherein the data-link layer decoder is a packet erasure decoder using a forward error correction (FEC) code.

5. The apparatus of Claim 4 and one or more of:- a) wherein the one or more downlink beams are transmitted from a counterpart return channel transmitter (TX) in a respective optical space terminal, and the respective optical space terminal is paired with the one of the optical ground terminals for optical communication; or

b)wherein the return channel RX further comprises a physical layer FEC decoder, a channel deinterleaver, and a demodulator.

6. An apparatus comprising:

one or more optical space terminals comprising at least a return channel transmitter (TX) and a forward channel receiver (RX), wherein

the return channel TX is configured to:

receive a plurality of return data frames at a physical layer;

encode the plurality of received return data frames by a physical layer encoder, wherein the physical layer encoder is a forward error correction (FEC) encoder; and

embed the plurality of encoded return data frames to one or more downlink beams by an optical modem in a data channel, wherein the one or more downlink beams are amplified by an optical power amplifier (PA), and the one or more downlink beams are transmitted via a return channel through air/vacuum.

7. The apparatus of Claim 6, wherein the one or more downlink beams are received by a counterpart return channel receiver (RX) in a respective optical ground terminal, and the respective optical ground terminal is paired with one of the optical space terminals for optical communication.

8. The apparatus of Claim 6, wherein the return channel TX comprises a channel interleaver, a modulator, and an optical low noise amplifier (LNA) configured to amplify the one or more downlink beams.

9. The apparatus of Claim 6, wherein the forward channel RX is configured to:

receive one or more uplink beams via one of multiple forward channels through air/vacuum;

extract forward channel data from the one or more uplink beams by an optical modem in a data channel, wherein the one or more uplink beams are amplified by an optical power amplifier (PA) in the data channel; and

decode the forward channel data into decoded data frames by a physical layer decoder, wherein the physical layer decoder is a forward error correction (FEC) decoder.

10. The apparatus of Claim 9, and one or more of:-a) wherein the one or more uplink beams are transmitted from a counterpart forward channel transmitter (TX) in a respective optical ground terminal, and the respective optical ground terminal is paired with the one of the optical space terminals for data communication; or b) wherein the forward channel RX comprises a plurality of physical layer FEC decoders, channel deinterleavers, and demodulators.

11. A system comprising:

one or more optical ground terminals, and a spacecraft having at least one or more optical space terminals and a space switch unit, wherein the spacecraft is configured to: receive a plurality of encoded data frames by a forward channel RX of one optical space terminal from a counterpart forward channel TX of a respective optical ground terminal at a data rate of 1 terabits-per-second (Tbps) or above via multiple forward channels through air/vacuum, wherein the respective optical ground terminal is paired with the optical space terminal for data communication, and the encoded data frames are encoded by the counterpart forward channel TX of the respective optical ground terminal;

decode the plurality of encoded data frames by the forward channel RX of the optical space terminal;

regenerate a plurality of data packets based on the plurality of decoded data frames by the space switch unit, wherein the data packets are at a layer of data-link or higher; and

route the regenerated data packets to another optical space terminal by the space switch unit, wherein another optical space terminal is paired with another optical ground terminals for data communication.

12. The system of Claim 11, wherein the space switch unit comprises at least a space switch and a RF channel former, wherein the RF channel former has a regenerative multi-channel RF modem.

13. The system of Claim 12, and one or more of:-a) wherein the regenerative multi-channel RF modem has a power amplifier (PA) and/or a low noise amplifier (LNA) in each channel; or

b) wherein the space switch is a terabit switch conducting data packet switch at the layer of data-link or higher; or

c) wherein the space switch is a make-before-break (MBB) switch detecting upcoming communication interruption and redirecting ongoing data communication from one of the optical space terminals to another one of the optical space terminals.

14. The system of Claim 11, wherein the spacecraft is further configured to:

transmit a plurality of encoded data frames by a return channel TX of one of optical space terminals to a counterpart return channel RX of a respective optical ground terminal at a data rate of 1 terabits-per-second (Tbps) or above via a return channel through air/vacuum, wherein the optical space terminal is paired with the respective optical ground terminals for data communication, and the encoded data frames are encoded by the return channel TX of the optical space terminal;

decode the plurality of encoded data frames by the counterpart return channel RX of the respective optical ground terminal; and

regenerate a plurality of data packets based on the plurality of decoded data frames by the counterpart return channel RX of the respective optical ground terminal, wherein the data packets are at a layer of data-link or higher.

15. The system of Claiml4, wherein the spacecraft is further configured to transmit the plurality of data packets to a network layer.