Performance of different DCSK schemes over the UWB in- body channel

混沌调制(differential chaos shift keying,DCSK)技术应用于超宽带(ultra wideband,UWB)短距离传输系统具有潜在的优势。提出了分别基于多元DCSK(M-ary DCSK,M-DCSK)、调频DCSK(frequency modulation-DCSK,FM-DCSK)和QCS-DCSK(quadrature code shifted-DCSK)的超宽带无线体内传输系统,分析了提出的基于最新几种混沌调制的超宽带体内传输系统的BER(bit error ratio)性能,对影响基于混沌调制的超宽带体内传输系统性能的参数积分时间和保护间隔做了理论研究和仿真分析。通过设置不同的扩频因子,在体内信道下QCS-DCSK相比MDCSK及FM-DCSK能够确保更好的传输质量,且功率损耗更低。在给定扩频因子β和信号持续时间Tc时,存在能使QCS-DCSK系统性能达到最优的保护间隔。在设定扩频因子β、信号持续时间Tc和保护间隔Tg时,存在能够使FM-DCSK系统性能达到最优的积分间隔。Because of its characteristics,differential chaos shift keying( DCSK) system is well suited for wireless short-range communication system. Based on M-ary DCSK,FM-DCSK and QCS-DCSK respectively,the ultra wideband wireless in-body communication systems are proposed. By deeply analyzing main characteristics about these systems,studying and simulating factors such as guard interval and integration time which affect performance of ultra wideband wireless in-body communication systems based on M-ary DCSK,FM-DCSK and QCS-DCSK,some optimizations have been made for these factors. The BER performance of those three schemes demonstrates that QCS-DCSK can provide better communication quality and require lower power consumption compared to other two DCSK schemes. For given spreading factor β and duration time Tc,the simulation results of QCS-DCSK over in-body channel with different guard intervals show that the optimal guard interval can ensure the best performance of QCS-DCSK over the UWB in-body channel. With given spreading factor β,duration time Tcand guard interval Tg,the optimal integration interval can improve the performance of FM-DCSK over the UWB in-body channel.The National Natural Science Foundation of China(61271241;61001073)~