Vlok, JDLinde, LP2007-08-132007-08-132007-09Vlok, JD and Linde, LP. 2007. Performance of sparse graph codes on a four-dimensional CDMA System in AWGN and multipath fading. IEEE Africon 2007. Windhoek, Namibia. 26-28 September 2007, pp 6http://hdl.handle.net/10204/1103This paper presents the uncoded and coded multi-user error performance results of a novel super-orthogonal (SO) 4D CDMA communication platform under AWGN and multi-path fading channel conditions. The communication platform employs a special class of root-of-unity filtered (RUF) constant-envelope (CE) complex spreading sequences (CSS) with zero cross-correlation (ZCC) properties. The uncoded communication platform employs multi-layered-modulation (MLM) to improve spectral efficiency compared with existing multi-level modulation techniques, and the coded system uses the multiple dimensions to transmit redundancy to improve error performance. Three classes of sparse graph coding schemes are evaluated and compared on the multi-dimensional (MD) communication platform. The channel codes include a 3D block-turbo-code (BTC) with extended Reed-Muller (RM) constituent codes, low-density parity-check (LDPC) codes and repeat-accumulate (RA) codes. It is shown that the three channel codes have comparable error performance results and approximately 6 dB performance improvement over BPSK is achieved at P e ( bit ) = 1 × 10-5enBlock turbo codesComplex spreading sequencesChannel modellingLog-likelihood ratioLow-density parity-checkSparse graph channel codingIEEE Africon 2007Conference PresentationVlok, J., & Linde, L. (2007). Performance of sparse graph codes on a four-dimensional CDMA System in AWGN and multipath fading. http://hdl.handle.net/10204/1103Vlok, JD, and LP Linde. "Performance of sparse graph codes on a four-dimensional CDMA System in AWGN and multipath fading." (2007): http://hdl.handle.net/10204/1103Vlok J, Linde L, Performance of sparse graph codes on a four-dimensional CDMA System in AWGN and multipath fading; 2007. http://hdl.handle.net/10204/1103 .TY - Conference Presentation AU - Vlok, JD AU - Linde, LP AB - This paper presents the uncoded and coded multi-user error performance results of a novel super-orthogonal (SO) 4D CDMA communication platform under AWGN and multi-path fading channel conditions. The communication platform employs a special class of root-of-unity filtered (RUF) constant-envelope (CE) complex spreading sequences (CSS) with zero cross-correlation (ZCC) properties. The uncoded communication platform employs multi-layered-modulation (MLM) to improve spectral efficiency compared with existing multi-level modulation techniques, and the coded system uses the multiple dimensions to transmit redundancy to improve error performance. Three classes of sparse graph coding schemes are evaluated and compared on the multi-dimensional (MD) communication platform. The channel codes include a 3D block-turbo-code (BTC) with extended Reed-Muller (RM) constituent codes, low-density parity-check (LDPC) codes and repeat-accumulate (RA) codes. It is shown that the three channel codes have comparable error performance results and approximately 6 dB performance improvement over BPSK is achieved at P e ( bit ) = 1 × 10-5 DA - 2007-09 DB - ResearchSpace DP - CSIR KW - Block turbo codes KW - Complex spreading sequences KW - Channel modelling KW - Log-likelihood ratio KW - Low-density parity-check KW - Sparse graph channel coding KW - IEEE Africon 2007 LK - https://researchspace.csir.co.za PY - 2007 T1 - Performance of sparse graph codes on a four-dimensional CDMA System in AWGN and multipath fading TI - Performance of sparse graph codes on a four-dimensional CDMA System in AWGN and multipath fading UR - http://hdl.handle.net/10204/1103 ER -