Polar code processing method and system, and wireless communications apparatus
A polar code processing method and system, and a wireless communications apparatus are provided, where the method includes: acquiring at least two periodic puncturing patterns and combining the at least two periodic puncturing patterns in a predetermined manner to obtain at least two hybrid puncturing patterns; selecting, from the at least two hybrid puncturing patterns, one with a lowest frame error rate as an optimal puncturing pattern; and performing rate matching on polar polar-coded bits according to the optimal puncturing pattern, and using the rate-matched bits as to-be-transmitted bits. A frame error rate may be reduced and HARQ performance of a polar code may be enhanced.
1. A method for processing polar code, comprising:
obtaining, by a wireless communication apparatus, a plurality of data bits;
performing, by the wireless communication apparatus, polar encoding on the plurality of data bits, to obtain a plurality of polar-coded bits;
performing, by the wireless communication apparatus, rate matching on the plurality of polar-coded bits according to an optimal puncturing pattern, wherein the optimal puncturing pattern is selected from at least two types of hybrid puncturing patterns, wherein the at least two types of hybrid puncturing patterns comprise:
a puncturing pattern obtained by combining at least two periodic puncturing patterns in a sequential arrangement, or
a puncturing pattern obtained by combining at least two periodic puncturing patterns in an alternate arrangement; and
transmitting, by the wireless communication apparatus, a plurality of rate-matched bits.
2. The method according to claim 1 , wherein:
before performing rate matching on the plurality of polar-coded bits according to the optimal puncturing pattern, the method further comprises:
separating, by the wireless communication apparatus, a system bit and a check bit that are in the polar-coded bits into two groups: a system bit group and a check bit group; and
performing rate matching on the plurality of polar-coded bits according to the optimal puncturing pattern comprises:
puncturing, by the wireless communication apparatus, the system bit group according to the optimal puncturing pattern to obtain a first bit group,
puncturing, by the wireless communication apparatus, the check bit group according to the optimal puncturing pattern to obtain a second bit group, and
combining, by the wireless communication apparatus, the first bit group and the second bit group to obtain a third bit group.
3. The method according to claim 2 , further comprising:
performing sequential interception or repetition on the plurality of rate-matched bits to obtain the bit that needs to be transmitted in each retransmission, and performing retransmission.
4. The method according to claim 1 , wherein:
before the step of performing rate matching on the plurality of polar-coded bits according to the optimal puncturing pattern, the method further comprises:
interleaving the plurality of rate-matched bits.
5. The method according to claim 1 , wherein the periodic puncturing patterns are nested periodic puncturing patterns.
6. A wireless communication apparatus, comprising:
a memory configured to store instructions; and
a processor coupled to the memory and configured to:
obtain a plurality of data bits;
perform polar encoding on the plurality of data bits, to obtain a plurality of polar-coded bits; and
perform rate matching on the plurality of polar-coded bits according to an optimal puncturing pattern, wherein the optimal puncturing pattern is selected from at least two types of hybrid puncturing patterns, wherein the at least two types of hybrid puncturing patterns comprise: a puncturing pattern obtained by combining at least two periodic puncturing patterns in a sequential arrangement or a puncturing pattern obtained by combining at least two periodic puncturing patterns in an alternate arrangement.
7. The wireless communication apparatus according to claim 6 , wherein the processor is further configured to:
separate a system bit and a check bit that are in the polar-coded bits into two groups: a system bit group and a check bit group;
puncture the system bit group according to the optimal puncturing pattern to obtain a first bit group;
puncture the check bit group according to the optimal puncturing pattern to obtain a second bit group; and
combine the first bit group and the second bit group to obtain a third bit group.
8. The wireless communication apparatus according to claim 6 , wherein the processor is further configured to:
interleave the plurality of rate-matched bits.
9. The wireless communication apparatus according to claim 6 , wherein the processor is further configured to:
perform sequential interception or repetition on the plurality of rate-matched bits to obtain the bit that needs to be transmitted in each retransmission, and perform retransmission.
10. The wireless communication apparatus according to claim 6 , wherein the periodic puncturing patterns are nested periodic puncturing patterns.