FFT-SPA based non-binary LDPC decoder for IEEE 802.11n standard

Non-binary LDPC (NB-LDPC) codes has inherent parallelism and excellent error correcting performance. By comparing with other traditional algorithm, FFT-SPA based non-binary LDPC code gives reduced computation complexity with better decoding performance. In this paper, FFT-SPA based NB-LDPC decoding performance is analyzed for the specification of IEEE 802.11n standard. Parity check matrix (PCM) defines the strength of the LDPC codes. By retaining the properties of the PCM structures, in this paper we propose two modified parity check matrices to reduce the computation strength. For various order of Galois Field with different PCM structures, non-binary LDPC codes performances are analyzed.