LLR calculation for LDPC coded SCBT in 60 GHz WPAN

The single-carrier block transmission (SCBT), a.k.a., single-carrier frequency-domain equalization (SC-FOE), is being considered as an option technique for the wireless personal area network (WPAN) operating at 60 GHz. It is found that for residential environment, in non-line-of-sight (NLOS) multi-path channels, the SCBT is much more effective to combat the inter-symbol interference (lSI) compared with orthogonal frequency division multiplexing (OFOM). Low-density parity-check (LOPC) codes are a class of linear block codes which provide near capacity performance on a large collection of data transmission and storage channels while simultaneously admitting implementable decoders. To facilitate using LOPC codes for SCBT system, a new log-likelihood ratio (LLR) calculation method is proposed based on pilot symbols (PS). Golay Sequences whose sum autocorrelation has a unique peak and zero sidelobe are used for creating the PS. The position and length of the PS are not fixed in the data blocks. The simulation results show that the proposed method can significantly improve the LOPC decoding performance in SCBT system. This is very promising to support ultra high-data-rate wireless transmission.