基于超宽带无线传感网络的导频优化脉冲同步算法

超宽带(UWB)技术因具有低功耗、极高时间和空间分辨率等特点成为无线传感网络主要物理层技术之一.本文主要研究基于发送-参考超宽带(TR-UWB)方式的传感网络信号检测与同步技术,文中提出一种新型自适应脉冲同步算法.该算法实现复杂度低,能够快速实现脉冲帧级同步.同步时间仅需要几个符号周期,同时把基于SQP的约束非线性最优化理论应用于设计脉冲导频符号进一步提高同步性能.此外,文中给出了两种脉冲符号级同步方法,它们在不同Eb/No时展现不同性能,可根据实际环境选择最适合的符号级同步方法.脉冲帧级同步具有自适应性,可根据实际的同步性能要求动态调节帧级同步的递归次数.理论分析和计算机仿真验证了该同步算法的性能.

Pulse Synchronization Algorithm with Pilot Optimization for UWB-based Wireless Sensor Netwoks

Ultra-wideband (UWB) technology offers the potential for low-power transmissions, robustness to multi-path fading and excellent range resolution capabilities, which provide a wealth of advantages for wireless sensor networks ,location application and so on.A novel low complexity adaptive pulsed synchronization algorithm for TR-UWB-based sensor networks is proposed in the paper. The algorithm can realize rapid synchronization, and synchronization time of the received signal is only several symbol durations. The pulsed frame-level synchronization has adaptive feature. Besides, constrained non-linearity optimization theory based on sequential quadratic programming (SQP) is applied into the pilot signal design. In the proposed algorithm, two different implementation methods of symbol-level synchronization are presented, which indicate the different performance under the diverse signal-noise-ratio conditions. The frame-level synchronization can dynamically adjust the iterative times according to specific requirement. Analysis and simulation verify the performance of the synchronization algorithm.