Towards 100 Gbps wireless communication: Investigation of FEC interleavers for PSSS-15 spreading

The main aspect considered in this paper is a comparison of interleaver sizes for convolutional and low-density parity-check codes (LDPC) employed for 100 Gbps wireless communication at 240 GHz with parallel sequence spread spectrum (PSSS). Interleavers required for PSSS-15 and convolutional codes are larger in silicon area than a complete Reed-Solomon decoder. Thus, convolutional codes are not recommended for the targeted application. LDPC codes require 10x smaller interleavers than convolutional codes and seem to be a good choice for the targeted data rate. Alternatively, interleaved Reed-Solomon decoders are proposed. Hard decision RS decoding reduces the size of the targeted forward error correction processor and provides error correction performance not lower than hard decision convolutional codes at the same code rate.