超宽带(ulTrA WIdE bAnd,uWb)技术具有低功耗、抗多径能力强等特点,已被无线体域网(WIrElESS bOdy ArEAnETWOrk,WbAn)作为一种候选传输技术,而调频差分混沌位移键控超宽带(frEQuEnCy-MOdulATEd dIffErEnTIAl CHAOSSHIfT kEyIng ulTrA WIdEbAnd,fM-dCSk uWb)实现简单,在接收机端不需要信道估计、信道均衡和rAkE接收,也得到了广泛的研究。主要对fM-dCSk uWb技术在WbAn的体内到体表、体表到体表和体表到体外3种信道模式下的性能进行了计算机仿真,并对影响其系统性能的积分时间和保护间隔2个参数进行了分析,仿真结果表明,fM-dC-Sk uWb技术用于WbAn信息传输是可行的。Ultra wideband(UWB) technique is adopted by the wireless body area networks(WBAN) as one of the most promising candidates due to its low power spectral density and high robustness against multipath fading.FM-DCSK UWB has gained much attention for its merits of no requiring channel estimation,channel equalization and rake reception in the receiver side.In this paper,the feasibility of FM-DCSK UWB over different WBAN channels,including implant to body surface,body surface to body surface and body surface to external,is investigated.Two system parameters directly affecting the system performance,i.e.,integration interval and guard interval,are carefully investigated respectively.Simulation results show that FM-DCSK UWB can be used as a feasible transmission technology for WBAN.国家自然科学基金(61001073;60972053)~
