分析了在超宽带通信系统中的扩频干扰，并用两种通用的调制技术实现了对提出的抗干扰方法的仿真-he　ultra　wideband　(UWB)　interference to　direct

sequence　spread　spectrum　(DSSS)　receiver　is　analyzed.　Two

popular　UWB　modulation　schemes,　the　time　hopping　pulse

position　modulation　(TH-PPM)　and　time　hopping　pulse

amplitude modulation　(TH-PAM),　are　considered. The　pulse

repetition rate (T’RR)　of UWB　signal and the freqnency　hand of

the DSSS play the primary roles in the BER performance of the

DSSS　receiver in the presence of UWB　interference. The UWB

signal parameters raising the interference　to DSSS receiver are

discussed.　The　characteristics of　an　aggregation of　multiple

UWB signals are somehow different　from that of　a single UWB

device,　especially　for　the　TB-PPM　scheme,　where discrete

spectral　lines maybe exist in　the band　of　DSSS　receiver. The

system　parameters　of　TH-PPM　such as the modulaiion　index

and maximum　shift　incurred　hy　the　time　hopping　code

determine　the amplitude of　the discret