The Multi-User Access Based on Cross-Layer CSMA of Wireless Sensor Network Spreading Communication System[J]. Optics and precision engineering, 2008, 16(2): 325-332.
The Multi-User Access Based on Cross-Layer CSMA of Wireless Sensor Network Spreading Communication System[J]. Optics and precision engineering, 2008, 16(2): 325-332.DOI:
Wireless sensor network (WSN) is an asynchronous communication network based on limited energy nodes working in a bad communication circumstance. This paper discusses an improved CSMA in a spread communication WSN system
analyses the possibility of connecting MAC layer and physical layer to reduce system collision and realize multi-user access with little increase of system complexity. The main idea is adjusting the phase of sending signal according to the phase of listened signal so that the received signal of different user has different phase which can be used to distinguish them out.