Method and apparatus for spectral efficient data transmission in satellite systems

Patent metadata

Field	Value
Publication number	US-10454569-B2
Application number	US-201815874361-A
Country	US
Kind code	B2
Filing date	Jan 18, 2018
Priority date	Mar 20, 2015
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

A communication satellite system provides for spectral efficient data transmissions by a gateway to multiple user terminals by way of a satellite. The gateway transmits multiple blocks in a single slot, each block intended for one of the user terminals, where each block is encoded and modulated according to a scheme that may be different for each intended user terminal. Upon re-transmission of a block if that block is lost or received in error, the block may be encoded and modulated according to another scheme that is less spectrally efficient than in the first transmission of the block.

First claim

What is claimed is:

1. A method comprising:
transmitting a first slot by a gateway to a satellite, the first slot comprising a block where the block occupies a first fraction of the first slot; and
transmitting a second slot by the gateway to the satellite upon the gateway receiving a negative acknowledgement for the transmission of the block in the first slot, the second slot comprising the block where the block occupies a second fraction of the second slot, the first and second slots having a same transmission time interval, and the second fraction larger than the first fraction.

2. The method of claim 1 , wherein the transmitting of the block in the second slot is less spectrally efficient than the transmitting of the block in the first slot.

3. A method of concatenated encoding by a gateway, the method comprising: providing a block check for a block; appending the block check to the block; segmenting the block with appended block check into at least one sub-block; encoding the at least one sub-block with a systematic encoder to provide parity bits; providing a sub-block check for each of the at least one sub-block; appending to each of the at least one sub-block its corresponding sub-block check; turbo encoding each of the at least one sub-block with appended sub-block check to provide at least one coded sub-block; grouping the parity bits into at least one parity block; providing a parity block check for each of the at least one parity block; appending to each of the at least one parity block its corresponding parity block check; turbo encoding each of the at least one parity block with appended parity block check to provide at least one coded parity block; and transmitting, by the gateway to a user terminal, a concatenation of each of the at least one coded sub-block with the at least one coded parity block.

4. The method of claim 3 , wherein
the block check for the block is a CRC (Cyclic Redundancy Check) for the block;
the sub-block check for each of the at least one sub-block is a CRC for each of the at least one sub-block; and
the parity block check for each of the at least one parity block is a CRC for each of the at least one parity block.

5. The method of claim 3 , wherein the at least one parity block consists of one parity block.

6. A gateway comprising:
a modem; and
at least one processor in communication with the modem, the at least one processor and the modem configured, in combination, to:
provide a block check for a block;
append the block check to the block;
segment the block with appended block check into at least one sub-block;
encode systematically the at least one sub-block to provide parity bits;
provide a sub-block check for each of the at least one sub-block;
append to each of the at least one sub-block its corresponding sub-block check;
turbo encode each of the at least one sub-block with appended sub-block check to provide at least one coded sub-block;
group the parity bits into at least one parity block;
provide a parity block check for each of the at least one parity block;
append to each of the at least one parity block its corresponding parity block check;
turbo encode each of the at least one parity block with appended parity block check to provide at least one coded parity block; and
transmit, by the gateway to a user terminal, a concatenation of each of the at least one coded sub-block with the at least one coded parity block.

7. The gateway of claim 6 , wherein
the block check for the block is a CRC (Cyclic Redundancy Check) for the block;
the sub-block check for each of the at least one sub-block is a CRC for each of the at least one sub-block; and
the parity block check for each of the at least one parity block is a CRC for each of the at least one parity block.

8. The gateway of claim 6 , wherein the at least one parity block consists of one parity block.

9. A gateway comprising:
means for providing a block check for a block;
means for appending the block check to the block;
means for segmenting the block with appended block check into at least one sub-block;
means for encoding the at least one sub-block with a systematic encoder to provide parity bits;
means for providing a sub-block check for each of the at least one sub-block;
means for appending to each of the at least one sub-block its corresponding sub-block check;
means for turbo encoding each of the at least one sub-block with appended sub-block check to provide at least one coded sub-block;
means for grouping the parity bits into at least one parity block;
means for providing a parity block check for each of the at least one parity block;
means for appending to each of the at least one parity block its corresponding parity block check;
means for turbo encoding each of the at least one parity block with appended parity block check to provide at least one coded parity block; and
means for transmitting, by the gateway to a user terminal, a concatenation of each of the at least one coded sub-block with the at least one coded parity block.

10. The gateway of claim 9 , wherein
the block check for the block is a CRC (Cyclic Redundancy Check) for the block;
the sub-block check for each of the at least one sub-block is a CRC for each of the at least one sub-block; and
the parity block check for each of the at least one parity block is a CRC for each of the at least one parity block.

11. The gateway of claim 9 , wherein the at least one parity block consists of one parity block.

12. A non-transitory computer-readable medium having stored instructions that, when executed by at least one processor in a gateway, cause the gateway to perform a method comprising:
providing a block check for a block;
appending the block check to the block;
segmenting the block with appended block check into at least one sub-block;
encoding the at least one sub-block with a systematic encoder to provide parity bits;
providing a sub-block check for each of the at least one sub-block;
appending to each of the at least one sub-block its corresponding sub-block check;
turbo encoding each of the at least one sub-block with appended sub-block check to provide at least one coded sub-block;
grouping the parity bits into at least one parity block;
providing a parity block check for each of the at least one parity block;
appending to each of the at least one parity block its corresponding parity block check;
turbo encoding each of the at least one parity block with appended parity block check to provide at least one coded parity block; and
transmitting, by the gateway to a user terminal, a concatenation of each of the at least one coded sub-block with the at least one coded parity block.

13. The non-transitory computer-readable medium of claim 12 , wherein
the block check for the block is a CRC (Cyclic Redundancy Check) for the block;
the sub-block check for each of the at least one sub-block is a CRC for each of the at least one sub-block; and
the parity block check for each of the at least one parity block is a CRC for each of the at least one parity block.

14. The non-transitory computer-readable medium of claim 12 , wherein the at least one parity block consists of one parity block.

15. A method of concatenated decoding by a user terminal, the method comprising:
demodulating, at the user terminal, one at least one coded sub-block and at least one at least one coded parity block; and
turbo decoding the demodulated at least one coded sub-block to provide a first estimate of at least one sub-block;
concatenating the first estimate of the at least one sub-block to provide a first

Assignees

• Qualcomm Inc

Inventors

• Wu Qiang
• Black Peter John

Classifications

• H04B7/18543

  for adaptation of transmission parameters, e.g. power control (for detecting or preventing errors in the information received H04L1/00) · CPC title

• H04L1/1867

  Arrangements specially adapted for the transmitter end · CPC title

• H04L1/0058

  Block-coded modulation · CPC title

• H04B7/18517 Primary

  Transmission equipment in earth stations · CPC title

• H04L1/0065

  Serial concatenated codes · CPC title