Methods and devices for operating in beam hopping configuration and under a range of signal to noise ratio conditions

• US 10,707,904 B1
• Filed: 11/24/2019
• Issued: 07/07/2020
• Est. Priority Date: 05/02/2019
• Status: Active Grant

• Current Assignee: SatixFy Israel Ltd.
• Original Assignee: SatixFy Israel Ltd.
• Inventors: Rainish, Doron, Freedman, Avraham
• Primary Examiner(s): Decady, Albert
• Assistant Examiner(s): Alshack, Osman M
• Application Number:
  US16/693,311
• Time in Patent Office: 226 Days
• Field of Search: 714756, 714776, 714777
• CPC Class Codes: H03M 13/2924 Cross interleaved Reed-Solomon codes [CIRC]
• CPC Class Codes: H03M 13/453 wherein the candidate code words are obtained by an algebraic decoder, e.g. Chase decoding
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/2125 Synchronisation
• CPC Class Codes: H04L 1/0005 applied to payload information
• CPC Class Codes: H04L 1/001 applied to control information
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/08 by repeating transmission, e.g. Verdan system H04L1/1858 and H04L1/189 take precedence
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 56/003 Arrangements to increase tolerance to errors in transmission or reception timing

Abstract

Methods and transceivers transmit communication frames that comprise a sequence of N symbols, ensuing payload header symbols, and ensuing payload message symbols. The sequence of N symbols encodes information according to signal-to-noise ratio associated with the communication frame.

Claims

1. A method for communicating in one or more links of a communication network, the method comprising:

transmitting a communication frame comprising a sequence of N symbols, ensuing payload header symbols, and ensuing payload message symbols, the sequence of N symbols encoding information in accordance with signal-to-noise ratio (SNR) associated with the communication frame, wherein the sequence of N symbols is selected from a set of four possible sequences of length N, and wherein the symbols for each of the four sequences are selected from a binary symbol alphabet consisting of a first symbol value and a second symbol value, and wherein a first sequence of the four possible sequences consists of N symbols of the first symbol value, and wherein a second sequence of the four possible sequences consists of N/3 symbols of the first symbol value followed by 2N/3 symbols of the second symbol value, and wherein a third sequence of the four possible sequences consists of 2N/3 symbols of the second symbol value followed by N/3 symbols of the first symbol value, and wherein a fourth sequence of the four possible sequences consists of N/3 symbols of the second symbol value followed by N/3 symbols of the first symbol value followed by N/3 symbols of the second symbol value.

2. The method of claim 1, wherein the encoded information is indicative of a number of the payload header symbols necessary to decode a corresponding number of the payload message symbols.

3. The method of claim 1, wherein the one or more links includes at least one transceiver implemented as part of a satellite.

4. The method of claim 1, wherein the communication frame includes a superframe header consisting of extended header field symbols and protection level indication symbols, and wherein the sequence of N symbols is included in the protection level indication symbols.

5. The method of claim 1, wherein the communication frame includes a superframe header consisting of L symbols that consists of a first segment of L−

N symbols and a second segment of N symbols, and wherein the encoded information is included in the second segment of symbols.

6. The method of claim 5, wherein L is 720, and wherein N is 216.

7. The method of claim 1, wherein the encoded information includes a mapping of a plurality of SNR ranges to a corresponding number of payload header symbols.

8. The method of claim 7, wherein the plurality of SNR ranges includes exactly four SNR ranges, and wherein a first SNR range of the plurality of SNR ranges is mapped to a first number of payload header symbols obtained by repeating a block of payload header symbols five times, and wherein a second SNR range of the plurality of SNR ranges is mapped to a second number of payload header symbols obtained by repeating the block of payload header symbols twice, and wherein a third SNR range of the plurality of SNR ranges is mapped to a third number of payload header symbols obtained by repeating the block of payload header symbols once, and wherein a fourth SNR range of the plurality of SNR ranges is mapped to a fourth number of payload header symbols obtained by puncturing the block of payload header symbols.

9. The method of claim 1, wherein the information encoded in the sequence of N symbols consists of two bits of information.

10. The method of claim 1, wherein the set of four possible sequences of length N are selected such that the minimum Hamming distance of the four possible sequences of length N is maximized.

11. The method of claim 1, further comprising:

generating the four possible sequences of length N.

12. The method of claim 11, wherein the generating includes applying a transform to each of the four sequences of length N, wherein the same transform is applied to each of the four sequences of length N, and wherein the transform includes one or more of:

permutation, and exclusive-or with a binary sequence of length N.

13. The method of claim 1, wherein the communication frame is a superframe compliant with Digital Video Broadcasting—

Satellite—

Second Generation Extensions (DVB-S2X) standard.

14. A communication system comprising:

a transceiver configured to transmit a communication frame comprising a sequence of N symbols, ensuing payload header symbols, and ensuing payload message symbols, the sequence of N symbols encoding information in accordance with signal-to-noise ratio (SNR) associated with the communication frame, wherein the sequence of N symbols is selected from a set of four possible sequences of length N, and wherein the symbols for each of the four sequences are selected from a binary symbol alphabet consisting of a first symbol value and a second symbol value, and wherein a first sequence of the four possible sequences consists of N symbols of the first symbol value, and wherein a second sequence of the four possible sequences consists of N/3 symbols of the first symbol value followed by 2N/3 symbols of the second symbol value, and wherein a third sequence of the four possible sequences consists of 2N/3 symbols of the second symbol value followed by N/3 symbols of the first symbol value, and wherein a fourth sequence of the four possible sequences consists of N/3 symbols of the second symbol value followed by N/3 symbols of the first symbol value followed by N/3 symbols of the second symbol value.

15. The communication system of claim 14, wherein the encoded information is indicative of a number of the payload header symbols necessary to decode a corresponding number of the payload message symbols.

16. The communication system of claim 14, wherein the transceiver is implemented in a satellite.

17. A method for communicating in one or more links of a communication network, the method comprising:

transmitting a communication frame that comprises a header including a sequence of N symbols, and one or more ensuing communication sub-frames, each communication sub-frame including a plurality of repeated blocks of payload header symbols followed by blocks of payload message symbols, the sequence of N symbols encoding information in accordance with signal-to-noise ratio (SNR) associated with the communication frame and indicative of a repetition factor to be applied to the blocks of payload header symbols, in each communication sub-frame, necessary to decode a corresponding number of the blocks of the payload message symbols, wherein the sequence of N symbols is selected from a set of four possible sequences of length N, and wherein the symbols for each of the four sequences are selected from a binary symbol alphabet consisting of a first symbol value and a second symbol value, and wherein a first sequence of the four possible sequences consists of N symbols of the first symbol value, and wherein a second sequence of the four possible sequences consists of N/3 symbols of the first symbol value followed by 2N/3 symbols of the second symbol value, and wherein a third sequence of the four possible sequences consists of 2N/3 symbols of the second symbol value followed by N/3 symbols of the first symbol value, and wherein a fourth sequence of the four possible sequences consists of N/3 symbols of the second symbol value followed by N/3 symbols of the first symbol value followed by N/3 symbols of the second symbol value.

18. A method for communicating in one or more links of a communication network, the method comprising:

receiving a communication frame comprising a sequence of N symbols, ensuing payload header symbols, and ensuing payload message symbols, the sequence of N symbols encoding information in accordance with signal-to-noise ratio (SNR) associated with the communication frame, wherein the sequence of N symbols is selected from a set of four possible sequences of length N, and wherein the symbols for each of the four sequences are selected from a binary symbol alphabet consisting of a first symbol value and a second symbol value, and wherein a first sequence of the four possible sequences consists of N symbols of the first symbol value, and wherein a second sequence of the four possible sequences consists of N/3 symbols of the first symbol value followed by 2N/3 symbols of the second symbol value, and wherein a third sequence of the four possible sequences consists of 2N/3 symbols of the second symbol value followed by N/3 symbols of the first symbol value, and wherein a fourth sequence of the four possible sequences consists of N/3 symbols of the second symbol value followed by N/3 symbols of the first symbol value followed by N/3 symbols of the second symbol value.

19. The method of claim 18, wherein the encoded information is indicative of a number of the payload header symbols necessary to decode a corresponding number of the payload message symbols.