naa a22 4500 510795196 CHVBK 20180411083334.0 cr unu---uuuuu 180411e20130401xx s 000 0 eng 10.1007/s11277-012-0627-1 doi (NATIONALLICENCE)springer-10.1007/s11277-012-0627-1 A Soft Demodulation Algorithm with Low Complexity for One-dimensional DPC System [Elektronische Daten] [Wei Yang, Zhenhua Yang, Changlong Xu] Based on the one-dimensional dirty paper coding (DPC) system, a low complexity algorithm is proposed to calculate log likelihood ratios (LLRs) for multi-level quadrature amplitude modulation (M − QAM). The M − QAM constellation is split into the in-phase and quadrature $${\sqrt{M}-PAM}$$ signal of mutual independence, and the LLR value of each bit is calculated on the expanded $${\sqrt{M}-PAM}$$ constellation. For both the complete interference pre-subtraction and partial interference pre-subtraction schemes, accurate LLR values can be obtained using the proposed simplified algorithm. The proposed algorithm is applied to the one-dimensional DPC system using convolutional code and low density parity check code respectively. Simulation results indicate that the bit error rate performance is almost not lost with the simplified algorithm while the computational complexity is reduced significantly. Springer Science+Business Media, LLC., 2012 Dirty paper coding (DPC) nationallicence Quadrature amplitude modulation (QAM) nationallicence Soft demodulation nationallicence Log likelihood ratio (LLR) nationallicence Low density parity check (LDPC) nationallicence Bit error rate (BER) nationallicence Yang Wei School of Electronic and Information Engineering, Beijing Jiaotong University, 100044, Beijing, China aut Yang Zhenhua State Key Laboratory of Integrated Service Networks, Xidian University, 710071, Xi'an, China aut Xu Changlong National Mobile Communications Research Laboratory, Southeast University, 210096, Nanjing, China aut Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1183-1195 0929-6212 69:4<1183 2013 69 11277 https://doi.org/10.1007/s11277-012-0627-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0627-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yang Wei School of Electronic and Information Engineering, Beijing Jiaotong University, 100044, Beijing, China aut NATIONALLICENCE 700 1- Yang Zhenhua State Key Laboratory of Integrated Service Networks, Xidian University, 710071, Xi'an, China aut NATIONALLICENCE 700 1- Xu Changlong National Mobile Communications Research Laboratory, Southeast University, 210096, Nanjing, China aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 69/4(2013-04-01), 1183-1195 0929-6212 69:4<1183 2013 69 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer