现有超声波宽带（UsWB）技术应用于人体通信存在速率不高、对多节点干扰抑制能力有限的问题。为此，提出一种有效抑制多节点干扰的超声波通信技术——直扩 超声波宽带（DS-UsWB）技术，利用直接序列扩频和超宽带技术仿真超声人体通信。 即在 k-Wave 中建模人体信道，利用建模信道的冲激响应仿真人体内多节点通信；根据信道冲激响应的时延特性确定发送信号参数，从而克服人体信道的多径效应。系统性能分析和仿真结果均表明，与 UsWB 技术相比，DS-UsWB 可有效抑制多节点干扰和多径干扰，具有更高的速率和更低的误码率。

The existing ultrasonic wideband ( UsWB) technology, when used in intra-body communications (IBCs), shows some shortcomings such as low rate and poor ability to resist multinode interference. Therefore, a direct-sequence ultrasonic wideband (DS-UsWB) technology was put forward. This technology can effectively resist the multinode interference. DS-UsWB adopts DS and ultra wide band (UWB) technology to simulate ultrasonic IBCs. That means to model the intra-body channel in k-Wave and simulate intra-body multinode communications with the impulse response of the channel model. The signal parameters, which are used to overcome the multi-path effect, are determined by analyzing the time delay characteristics of the channel impulse response. Both the analysis of system performance and simulation results verify that, compared with UsWB technology, DS-UsWB can effectively resist the multinode and multi-path interference, and achieve higher data rate and lower bit error rate.