【摘要】 用红外线作为室内无线通信传输媒质的红外无线局域网,由于具有成本低、功耗小等特性,现已逐渐被广泛应用;分析了红外无线局域网媒质访问控制层协议及其所存在的问题;推导了红外无线局域网归一化吞吐量的计算公式,研究了竞争窗口的大小与调节方式,在此基础上对网络的媒质接入性能进行了优化设计,提出了红外自适应接入算法,弥补了现有红外局域网的不足之处;利用OPNET 仿真软件,对优化后的红外自适应接入性能进行了仿真验证。更多还原

【Abstract】 Because of the features of low cost and low power consumption, infrared wireless local area networks which use infrared ray as the transmission medium for short range indoor wireless communication have been used widely. In this paper, the infrared medium access control layer protocol and some problems concerned are analyzed. The formulas for calculating the normalized throughput of infrared wireless local area networks are deduced and the content window size and its adjustment method are studied. On the basis of above work, the performance of the medium access control is optimized and a new infrared adaptive medium access algorithm which can overcome the shortcomings of existing IrWLANs is proposed. The optimized infrared adaptive access performance is verified by using the OPNET Modeler package.更多还原