Non-binary coded CCSK and Frequency-Domain Equalization with simplified LLR generation

Oussama Abassi, Laura Conde-Canencia, Mohammad Mansour, Emmanuel Boutillon
2013 2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)  
In this paper, we investigate the performance of Single-Carrier (SC) transmission with Non-Binary Low-Density Parity-Check (NB-LDPC) coded Cyclic Code-Shift Keying (CCSK) signaling in a multipath environment and we show that the combination of CCSK signaling and non-binary codes results in two key advantages, namely, improved Log-Likelihood Ratio (LLR) generation via correlations and reduced implementation complexity. We demonstrate that Maximum Likelihood (ML) demodulation can be expressed by
more » ... wo circular convolution operations and thus it can be processed in the frequency domain. Then, we propose a joint Frequency-Domain Equalization (FDE) and LLR generation scheme that aims at reducing the complexity of the receiver. Finally, we demonstrate through Monte-Carlo simulations and histogram analysis that this proposed CCSK signaling scheme gives more robustness to SC-FDE systems than commonly employed Hadamard signaling schemes (a gap of ≈ 1.5dB in favor of CCSK signaling is observed at BER = 10 −5 , assuming perfect Channel State Information).
doi:10.1109/pimrc.2013.6666375 dblp:conf/pimrc/AbassiCMB13 fatcat:zpal6y7bsbdgbklenplf3vmi3e