7.7Gbps encoder design for IEEE 802.11n/ac QC-LDPC codes

This paper proposes a high throughput encoding process and encoder architecture for quasi-cyclic low-density parity-check (QC-LDPC) codes in IEEE 802.11n/ac standards. In order to achieve the high throughput with low complexity, a partially parallel processing based encoding process and encoder architecture are proposed. Forward and backward accumulations are performed in one clock cycle to increase the encoder throughput. A low complexity cyclic shifter is also proposed to minimize the hardware overhead of combinational logic in the encoder architecture. The proposed encoder is implemented with 130-nm CMOS technology. For (1944, 1620) irregular code, 7.7 Gbps throughput is achieved at 100 MHz clock frequency. The gate count of the proposed encoder core is about 96 K.