激光技术Issue(3)：410-415,6.DOI:10.7510/jgjs.issn.1001-3806.2015.03.028
弱湍流条件下 LDPC码室内 FSO 通信系统调制性能分析
Performance analysis of an indoor LDPC coded FSO communication system under weak turbulent condition
摘要
Abstract
In order to overcome the burst error caused by light intensity scintillation under the weak turbulence atmosphere , free space optical ( FSO ) system model was analyzed based on on-off keying ( OOK ) , pulse position modulation (PPM), differential pulse position modulation (DPPM) and digital pulse interval modulation (DPIM).The bit error rate ( BER) calculating formula of uncoded system was derived under all above the modulation methods .On this basis, low density parity check ( LDPC) codes and belief propagation ( BP) algorithm were applied to the optical wireless communication system , the decoding algorithm was analyzed according to the system model , and simulation was carried out in the atmospheric turbulence channel .The results show that , PPM has the best bit error rate performance , and LDPC coded weak atmospheric turbulent optical system has better BER performance than the uncoded system .LDPC codes can augment the code gain efficiently and to improve the jamming-rejection capability , and it is suited for optical wireless communication .关键词
光通信/大气湍流/调制方式/低密度奇偶校验码/误比特性能Key words
optical communication/atmospheric turbulence/modulation scheme/low density parity check codes/bit error rate performance分类
信息技术与安全科学引用本文复制引用
刘洋,章国安..弱湍流条件下 LDPC码室内 FSO 通信系统调制性能分析[J].激光技术,2015,(3):410-415,6.基金项目
国家自然科学基金资助项目（61371113）；交通运输部应用基础研究资助项目（2013319825110）；江苏省普通高校研究生科研创新计划资助项目（ CXZZ13＿0689）；南通大学研究生科技创新计划资助项目 （）
