信息安全与通信保密
信息安全與通信保密
신식안전여통신보밀
CHINA INFORMATION SECURITY
2014年
9期
167-169,174
,共4页
LDPC%MFSK%快跳频%部分频带干扰%瑞利衰落
LDPC%MFSK%快跳頻%部分頻帶榦擾%瑞利衰落
LDPC%MFSK%쾌도빈%부분빈대간우%서리쇠락
low density parity check(LDPC)%m-ary frequency shift keying (MFSK)%fast frequency-hopping%partial-band jam-ming%Rayleigh fading
信道编码与跳频技术结合是提高系统抗干扰能力的一种有效方法。将LDPC码应用于多进制调制快跳频系统，研究其在瑞利衰落信道中对抗部分频带干扰的能力。仿真结果表明，当分集级数固定时，调制阶数越高性能越好，但增加调制阶数带来的增益差会逐渐降低并且增大系统复杂度。另外，由于分集增益和非相干合并损失的同时存在，增大分集级数在干扰因子较小时能够提高系统性能，较大时则降低系统性能。
信道編碼與跳頻技術結閤是提高繫統抗榦擾能力的一種有效方法。將LDPC碼應用于多進製調製快跳頻繫統，研究其在瑞利衰落信道中對抗部分頻帶榦擾的能力。倣真結果錶明，噹分集級數固定時，調製階數越高性能越好，但增加調製階數帶來的增益差會逐漸降低併且增大繫統複雜度。另外，由于分集增益和非相榦閤併損失的同時存在，增大分集級數在榦擾因子較小時能夠提高繫統性能，較大時則降低繫統性能。
신도편마여도빈기술결합시제고계통항간우능력적일충유효방법。장LDPC마응용우다진제조제쾌도빈계통，연구기재서리쇠락신도중대항부분빈대간우적능력。방진결과표명，당분집급수고정시，조제계수월고성능월호，단증가조제계수대래적증익차회축점강저병차증대계통복잡도。령외，유우분집증익화비상간합병손실적동시존재，증대분집급수재간우인자교소시능구제고계통성능，교대시칙강저계통성능。
The combination of channel coding and frequency-hopping technology is an efficient way to improve the anti-jamming ca-pacity of the system. LDPC code is employed in M-ary modulated fast frequency-hopping system,and the system performance in the Rayleigh fading channel with partial-band jamming is studied. The simulation results show that the system performance is improved a-long with the rising of modulation order when the diversity levels are fixed,but the differences of performance gain would decrease and the system become more complex. In addition,the rising of diversity level would improves the system performance when jamming factor is fairly small,but decrease the system performance when jamming factor is fairly large,due to the co-existence of diversity gain and non-coherent combined loss.
