无线城域网中的关键技术Key Technologies for Wireless Metropolitan Area Network马楠,刘培植,张平 摘要：文章对无线城域网中的服务质量(QoS)实现、正交频分多址(OFDMA)物理层技术与链路自适应技术相结合算法进行了研究。在无线城域网中，IEEE 802.16 媒体接入控制(MAC)层通过将MAC传输的包映射到业务流，并映射到由连接标识(CID)标识的连接上，通过根据业务流(SF)提供的QoS参数进行调度，保障MAC的QoS特性；链路自适应技术根据无线信道变化，通过不断监测无线链路自适应地调整物理层参数。 关键词：无线城域网；媒体接入控制层；服务质量；正交频分多址；链路自适应 Abstract:The implementation of QoS in Wireless-MAN and the algorithm of combining physical layer and link adaptation technologies are studied in this paper. In Wireless-MAN, there are two ways to guarantee media access control (MAC) layer QoS: IEEE 802.16 MAC layer maps incoming packets into service flow (SF) and connections indicated by connection ID (CID); scheduling are performed according to the QoS parameters provided by SF. In addition, link adaptation can adaptively adjust physical layer parameters based on the monitoring of radio channel changes. Key words:wireless MAN; MAC layer; QoS; OFDMA; link adaptation     尽管无线局域网(WLAN)技术已经得到了广泛的应用，但是人们对于无线宽带通信的探...