论文部分内容阅读
水下传感器网络(UWSN)中节点采用声波通信,水声信道的高误码率、长延迟、低带宽、多径效应、多普勒频散等技术,据此提出一种动态的、分布式的基于码分多址(CDMA)的水下传感器网络介质访问控制层(MAC)协议.该协议不但节能,还能够提高CDMA扩频码的重用率,并且能够适应网络拓扑的动态变化.同时,协议使用了功率控制机制,有效解决CDMA系统中普遍存在的“远-近”效应问题.仿真实验表明,与经典的静态编码分配协议和ALOHA相比,该协议在冲突率、交付率、端到端的延迟、能耗等方面具有更好的性能.
In the underwater sensor network (UWSN), the nodes adopt the technologies of acoustic communication, high bit error rate of underwater acoustic channel, long delay, low bandwidth, multipath effect and Doppler frequency dispersion. Based on this, a dynamic and distributed (MAC) protocol based on Code Division Multiple Access (CDMA), which can not only save energy, but also improve the reusability of CDMA spreading codes and adapt to the dynamic changes of network topology.At the same time, The protocol uses the power control mechanism to effectively solve the “far-near” effect problem that is common in CDMA systems. Simulation results show that compared with the classical static coding and ALOHA protocol, this protocol has better performance in collision rate, delivery rate, End-to-end delay, energy consumption, etc. have better performance.