Timing synchronization of symbol boundaries is known to affect critically the performance of all coherent communication systems. Its effects are particularly pronounced in contemporary wireless technologies including ultrawideband (UWB) radios and wireless sensor networks (WSNs), where cooperative or ad hoc access is challenged by arbitrary asynchronism, intersymbol interference (ISI), receiver noise, as well as inter and intrapiconet interference arising from concurrently communicating nodes. To cope with these challenges, this paper introduces piconet-specific synchronization patterns and simple averaging operations at the receiving ends, which enable low-complexity timing acquisition through energy detection and demodulation by matching to a synchronized aggregate template (SAT). Pattern sequences are designed for both training-based and blind operation. Either way, the idea behind these designs is to periodically increase the transmit-power ("voice") of each piconet's synchronizing node with a period ("pace") characteristic of each piconet. Performance of the novel synchronization protocols is tested with simulations conforming to an UWB wireless personal area network (WPAN) setup.
Bibliographical noteFunding Information:
Manuscript received November 29, 2005; revised April 2, 2006. The associate editor coordinating the review of this manuscript and approving it for publication was Dr. Mounir Ghogho. This work was supported in part by the NSF-ITR under Grant EIA-0324864, and through collaborative participation in the Communications and Networks Consortium sponsored by the U.S. Army Research Laboratory under the Collaborative Technology Alliance Program, Cooperative Agreement DAAD19-01-2-0011. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation thereon. Part of the results in this paper were presented at the Asilomar Conference on Signals, Systems, and Computers, Pacific Grove, CA, October 30–November 2, 2005.
- Ultrawideband (UWB)
- Wireless personal area network (WPAN)
- Wireless sensor network (WSN)