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To satisfy the demanding requirements of 5G NR system, new error-correcting codes have been introduced in 5G NR for both data and control channels. Low-density parity-check (LDPC) codes are adopted to support data channels, replacing the turbo codes used in 4G LTE system. Polar codes are adopted to support control channels, replacing the tail-biting convolutional codes in 4G LTE. This chapter describes in detail the design features of the adopted LDPC codes and polar codes and related operations such as CRC attachment, segmentation, interleaving, and rate matching. Finally, simulation curves are provided to demonstrate the superior performance and implementation advantages of the sophisticated code designs. |
