Concatenated polar code with adaptive error detection
According to certain embodiments, a method by a transmitter is provided for adaptively generating precoder bits for a Polar code. The method includes acquiring at least one configuration parameter upon which a total number of precoder bits depends. The at least one configuration parameter comprising at least one of an information block length K, a code block length N, and/or a code rate R=K/N. The total number of precoder bits is determined, and the precoder bits for a code block are generated according to the determined total number of precoder bits. The precoder bits are placed within the code block.
1. A method by a transmitter for adaptively generating precoder bits for a Polar code, the method comprising:
acquiring an information block length K, and a code block length, N, associated with information bits to be transmitted in an uplink control information message;
determining, by the transmitter, a number of CRC bits for a code block having the code block length, N, the number of CRC bits depending upon the information block length, K, and the code block length, N;
generating the CRC bits for the code block according to the determined number of CRC bits;
placing the CRC bits within the code block; and
encoding the code block containing the information bits and the CRC bits with a Polar code.
2. The method of claim 1 , wherein placing the CRC bits within the code block comprises placing the CRC bits at interleaved positions through the use of an interleaver.
3. The method of claim 1 , wherein the step of generating the CRC bits is based on at least one of:
latency requirements;
reliability requirements;
wireless channel conditions as indicated by a target code rate; and
available radio resources as indicated by the code block length, N.
4. The method of claim 1 , wherein generating the CRC bits comprises generating CRC bits using a single CRC generator polynomial.
5. The method of claim 1 , wherein generating the CRC bits comprises generating CRC bits using two or more CRC generator polynomials.
6. The method of claim 1 , wherein determining the number of CRC bits comprises:
allocating a first number of the available CRC bits (L d ) to error detection; and
allocating a second number of the available CRC bits (L c ) to error correction.
7. The method of claim 6 , wherein:
the first number of the available CRC bits (L d ) is a minimum number of CRC bits (L d,0 ) associated with a minimum level of error detection for a number of info bits; and
the second number of the available CRC bits (L c ) is determined by subtracting the first number of available CRC bits (L d ) from a number of available CRC bits (L total ).
8. The method of claim 6 , wherein:
the first number of the available CRC bits (L d ) allocated to error detection is greater than a minimum number of CRC bits (L d,0 ) associated with a minimum level of error detection to provide increased error detection capability.
9. The method of claim 1 , wherein determining the number of CRC bits comprises:
(a) allocating a first number of the available CRC bits (L d,1 ) to error detection and a second number of the available CRC bits (L c,1 ) to error correction for lower error detection capability and higher error correction capability;
(b) allocating a third number of the available CRC bits (L d,2 ) to error detection and a fourth number of the available CRC bits (L c,2 ) to error correction for medium error detection capability and medium error correction capability;
(c) allocating a fifth number of the available CRC bits (L d,3 ) to error detection and a sixth number of the available CRC bits (L c,3 ) to error correction for higher error detection capability and lower error correction capability, and
wherein for a minimum number of CRC bits (L d,0 ) associated with a minimum level of error detection to provide increased error detection capability, the following is true:
L d,0<= L d,1 <L d,2 <L d,3 , and
L c,1 >L c,2 >L c,3 .
10. The method of claim 1 , wherein the transmitter comprises a wireless device.
11. The method of claim 1 , wherein the transmitter comprises a network node.
12. A transmitter for adaptively generating precoder bits for a Polar code, the transmitter comprising:
at least one processor configured to:
acquire at least one configuration parameter comprising an information block length K, and a code block length, N, associated with information bits to be transmitted in an uplink control information message;
determine a number of CRC bits for a code block having the code block length, N, the number of CRC bits depending upon the information block length, K, and the code block length, N;
generate the CRC bits for the code block according to the determined number of CRC bits;
place the CRC bits within the code block; and
encode the code block containing the information bits and the CRC bits with a Polar code.
13. The transmitter of claim 12 , wherein when placing the CRC bits within the code block the at least one processor is configured to place the CRC bits at interleaved positions through the use of an interleaver.
14. The transmitter of claim 12 , wherein the CRC bits are generated based on at least one of:
latency requirements;
reliability requirements;
wireless channel conditions as indicated by a target code rate; and
available radio resources as indicated by a code length.
15. The transmitter of claim 12 , wherein the at least one processor is configured to generate the CRC bits using a single CRC generator polynomial.
16. The transmitter of claim 12 , wherein the at least one processor is configured to generate the CRC bits using two or more CRC generator polynomials.
17. The transmitter of claim 12 , wherein when determining the number of CRC bits the at least one processor is configured to:
allocate a first number of the available CRC bits (L d ) to error detection; and
allocate a second number of the available CRC bits (L c ) to error correction.
18. The transmitter of claim 17 , wherein:
the first number of the available CRC bits (L d ) is a minimum number of CRC bits (L d,0 ) associated with a minimum level of error detection for a number of info bits; and
the second number of the available CRC bits (L c ) is determined by subtracting the first number of available CRC bits (L d ) from a number of available CRC bits (L total ).
19. The transmitter of claim 17 , wherein:
the first number of the available CRC bits (L d ) allocated to error detection is greater than a minimum number of CRC bits (L d,0 ) associated with a minimum level of error detection to provide increased error detection capability.
20. The transmitter of claim 12 , wherein when determining the number of CRC bits the at least one processor is configured to:
(a) allocate a first number of the available CRC bits (L d,1 ) to error detection and a second number of the available CRC bits (L c,1 ) to error correction for lower error detection capability and higher error correction capability;
(b) allocate a third number of the available CRC bits (L d,2 ) to error detection and a fourth number of the available CRC bits (L c,2 ) to error correction for medium error detection capability and medium error correction capability;
(c) allocate a fifth number of the available CRC bits (L d,3 ) to error detection and a sixth number of the available CRC bits (L c,3 ) to error correction for higher error detection capability and lower error correction capability, and
wherein for a minimum number of CRC bits (L d,0 ) associated with a minimum level of error detection to provide increased error detection capability, the following is true:
L d,0<= L d,1 <L d,2 <L d,3 , and
L c,1 >L c,2 >L c,3 .
21. The transmitter of claim 12 , wherein the transmitter comprises a wireless device.
22. The transmitter of claim 12 , wherein the transmitter comprises a network node.