Zhang, ShunwaiYang, FengfanTang, LeiEjaz, SaqibLuo, LinMaharaj, Bodhaswar Tikanath Jugpershad2017-04-062017-04-062016-03Shunwai Zhang, Fengfan Yang, Lei Tang, Saqib Ejaz, Lin Luo & B.T. Maharaj (2016) Joint design of QC-LDPC codes for coded cooperation system with joint iterative decoding,International Journal of Electronics, 103:3, 384-405, DOI: 10.1080/00207217.2015.1036374.0020-7217 (print)1362-3060 (online)10.1080/00207217.2015.1036374http://hdl.handle.net/2263/59680In this paper, we investigate joint design of quasi-cyclic low-density-parity-check (QC-LDPC) codes for coded cooperation system with joint iterative decoding in the destination. First, QC-LDPC codes based on the base matrix and exponent matrix are introduced, and then we describe two types of girth-4 cycles in QC-LDPC codes employed by the source and relay. In the equivalent parity-check matrix corresponding to the jointly designed QC-LDPC codes employed by the source and relay, all girth-4 cycles including both type I and type II are cancelled. Theoretical analysis and numerical simulations show that the jointly designed QC-LDPC coded cooperation well combines cooperation gain and channel coding gain, and outperforms the coded noncooperation under the same conditions. Furthermore, the bit error rate performance of the coded cooperation employing jointly designed QC-LDPC codes is better than those of random LDPC codes and separately designed QC-LDPC codes over AWGN channels.en© 2015 Taylor and Francis. This is an electronic version of an article published in International Journal of Electronics, vol. 103, no. 3, pp. 384-405, 2016.. doi : . International Journal of Electronics is available online at : http://www.tandfonline.comtoc/tetn20.QC-LDPC codesCoded cooperationEquivalent parity-check matrixGirth-4 cyclesJoint designQuasi-cyclic low-density-parity-check (QC-LDPC)Postprint Article