Channel coding and modulation
The present application relates to methods, systems, and devices related to digital wireless communication, and more specifically, to techniques related to channel coding and modulation. In one exemplary aspect, a method for wireless communication is disclosed. The method includes performing multiple operations that include a first operation related to pre-channel coding and/or a second operation comprising attaching redundancy check bits in an order. The method can also include generating a transmission waveform by a first node using one or more bits for transmission to a second node over a wireless channel using information derived from the multiple operations.
1. A method of wireless communication, comprising:
performing, by a first node, multiple operations that include a first operation related to pre-channel coding and a second operation comprising attaching redundancy check bits in an order that includes the first operation being performed prior to the second operation; and
generating a transmission waveform by the first node using one or more bits for transmission to a second node over a wireless channel using information derived from the multiple operations.
2. The method of claim 1 , wherein the second operation includes a transport block cyclic redundancy check (CRC) attachment operation.
3. The method of claim 1 , wherein the second operation includes a code block CRC attachment operation.
4. The method of claim 1 , further comprising:
performing, by the first node, at least one of a scrambling operation or an interleaving operation after a modulation mapping operation.
5. The method of claim 4 , wherein the scrambling operation comprises a modulation symbol scrambling operation to modify a phase of modulation symbols in a modulation symbol sequence, wherein a phase rotation angle for each modulation symbol includes a value from a set of phase rotation angles.
6. The method of claim 5 , wherein the phase of each modulation symbol in the modulation symbol sequence is a value from the set of phase rotation angles.
7. The method of claim 5 , wherein the phase of each modulation symbol in the modulation symbol sequence is determined based on a specified complex-value sequence.
8. The method of claim 5 , wherein the set of phase rotation angles includes a subset of: 0 degrees, 90 degrees, 180 degrees, 270 degrees, and 360 degrees.
9. The method of claim 4 , wherein the interleaving operation is performed using a modulation symbol sequence, wherein a result of the interleaving operation comprises an interleaved modulation sequence.
10. The method of claim 4 , wherein the interleaving operation includes any of: swapping every two consecutive modulation symbols in a modulation symbol sequence based on a specified bit sequence, performing a cyclic left or right shift to the modulation symbol sequence based on a specified integer, performing the cyclic left or right shift based on the specified integer and swapping every two consecutive modulation symbols based on the specified bit sequence to the modulation symbol sequence.
11. The method of claim 1 , further comprising:
performing, by the first node, at least one of a scrambling operation or an interleaving operation before a modulation mapping operation.
12. The method of claim 11 , wherein the scrambling operation comprises a bit scrambling operation that is performed to a first set of bits that excludes a set of output bits of the first operation relating to pre-channel coding.
13. The method of claim 11 , wherein the interleaving operation is performed on a set of output bits of the first operation relating to pre-channel coding.
14. The method of claim 11 , wherein the interleaving operation permutes bit elements of a first set of bits, wherein a bit length of the bit elements includes a length of labeling of a symbol set included in the modulation mapping operation.
15. The method of claim 11 , wherein the interleaving operation permutes Qm-bit elements of a set of output bits of the first operation, wherein a bit length of the Qm-bit elements includes a length of labeling of the modulation mapping operation.
16. The method of claim 11 , wherein labelling of a symbol set included in the modulation mapping operation includes a first label of a smallest symbol in the symbol set including more 1 values than that of a second label of a largest symbol in the symbol set.
17. The method of claim 11 , wherein labelling of a symbol set included in the modulation mapping operation comprises a label for all 1 values being mapping to a constellation point with a smallest power value.
18. An apparatus for wireless communication comprising a processor and a memory storing instructions that, when executed by the processor, cause the apparatus to:
perform multiple operations that include a first operation related to pre-channel coding and a second operation comprising attaching redundancy check bits in an order that includes the first operation being performed prior to the second operation; and
generate a transmission waveform using one or more bits for transmission to a node over a wireless channel using information derived from the multiple operations.
19. A non-transitory computer readable medium having code stored thereon, the code when executed by a processor, causing the processor to:
perform multiple operations that include a first operation related to pre-channel coding and a second operation comprising attaching redundancy check bits in an order that includes the first operation being performed prior to the second operation; and
generate a transmission waveform using one or more bits for transmission to a node over a wireless channel using information derived from the multiple operations.
20. The method of claim 1 , wherein the first operation related to pre-channel coding comprises at least one of a bit-to-symbol encoding or a symbol-to-bit conversion.