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5G NR Channel Coding | Coding techniques for 5G NR Channels

This page describes 5G NR Channel Coding. It mentions coding techniques applied for different types of 5G NR Channels.Polar coding is used for PBCH, PDCCH and PUCCH where as LDPC (Low Density Parity Check) is used for PDSCH and PUSCH.

Channel coding techniques used in 5G NR (New Radio) are different than used in LTE. LDPC is replacing Turbo coding which is used in PDSCH channel where as Polar coding is replacing TBCC (Tail Biting Convolutional Codes) used in PDCCH channel. Repetition/block coding is used for very small block lengths of data. It is defined in 3GPP TS 38.212 document.

Following table mentions 5G NR channel coding techniques used for different traffic channels/Control informations. Physical channels include PUSCH, PDSCH, PUCCH, PDCCH, PBCH etc.

Traffic Channel/Control Information Coding Techniques
UL-SCH (carried by PUSCH) LDPC
DL-SCH (carried by PDSCH) LDPC
PCH (carried by PDSCH) LDPC
BCH (carried by PBCH) Polar Code
DCI (carried by PDCCH) Polar Code
UCI (carried by PUCCH or PUSCH) Block code, Polar code

No channel coding technique is used for RACH (carried by PRACH physical channel). Zadoff chu sequences are used to generate 5G NR random access preamble for RACH channel. Refer 5G NR PRACH for more information. The links to other 5G NR channels are mentioned below for further study.

Polar coding

Polar Coding Block Diagram

For polar coding basics and advantages/disadvantages of polar codes, Refer Polar coding advantages and disadvantages >>.

References 5G NR Channel Coding:

• Polar coding - Section 5.3.1 of 3GPP TS 38.212 Release-15
• LDPC coding - Section 5.3.2 of 3GPP TS 38.212 Release-15

5G NR Numerology | 5G NR Terminology

5G NR Control channels | 5G NR Traffic Channels | 5G NR Reference Signals and sequences


This 5G tutorial also covers following sub topics on the 5G technology:
5G basic tutorial
5G Frequency Bands
5G millimeter wave tutorial
5G mm wave frame
5G millimeter wave channel sounding
Difference between 4G and 5G
5G testing and test equipments
5G network architecture
5G NR Physical layer
5G NR MAC layer
5G NR RLC layer
5G NR PDCP layer

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