FPGA Implementation of Rate Matching in 5G NR PDSCH
Rochak Jain, Naveed Anjum, Samudrala Soujanya, Harsha Rudramuniyappa, Aviral Jain, Ashutosh Bisht, Ekant Sharma, Prem Singh · 2023
5G new radio (NR) distinguishes itself by offering remarkable features such as significantly higher throughput and lower latency compared to 4G. In 5G, low density parity check (LDPC) encoding is employed as the channel coding scheme for the transmission of data bits. Subsequent to the LDPC encoding stage, bit selection and bit interleaving operations are performed. Rate matching plays an important role in selecting specific encoded bits for transmission, utilizing techniques like shortening and repetition to support hybrid automatic repeat request functionality. To address the issue of latency encountered in processing large transport blocks, we propose parallel algorithms for the rate matching. These algorithms are implemented on field programmable gate arrays, and then the performance of the optimized algorithms is compared with the existing algorithms specified in the 3rd generation partnership project standards.