5G NR: LDPC/Polar Coding

                                                        
In LTE, Tail Bit Convolution Coding and Turbo Coding are the major technology for channel coding,

But in for 5G NR Low Density Parity Check (LDPC) coding is replacing the Turbo coding that was previously used for PDSCH coding and Polar Codes are replacing the Tail Biting Convolutional Codes (TBCC) used previously for PDCCH coding,

Basically, Polar Coding is to replace TBCC (Tail Bit Convolution Code) and LDPC is to replace Turbo Coding.

Turbo Coding is relatively simple at Encoding phase but complex in decoding phase. This complexity gets higher as the size of code block gets larger.

LDPC is not as simple as turbo coding at Encoding phase, but much simpler in decoding phase. So good for large block size. 

In terms of latency, LDPC codes are parallel in nature while Turbo codes are serial in nature, which allow LDPC to support low latency application in a better way than Turbo codes.