Research And Implementation On The Key Technologies Of Enhanced Media Access Control In Ultral-High-Speed Wireless Local Area Network

With the rapid development of mobile Internet technology, the scope of application of mobile multimedia services become more widely, while the demand for high-speed wireless communications escalating. Thus, high-speed wireless communication system develops rapidly. And the wireless communication system is bound towards higher physical layer (PHY) transmission rates, higher spectral efficiency and a more flexible type of business strides in future. As a high speed, low cost and flexible wireless network access, the wireless local area network (LAN) technology has become an important part of radio access network. Therefore, in-depth study of the ultra-high-speed wireless LAN technology has not only theoretical significance, but also has practical significance.This paper relies on the National Science and Technology Major Project," ultra-high-speed wireless LAN radio interface key technology research and Verification",(Project No.:2010ZX03005), the project focuses on the new generation of ultra-high-speed wireless LAN air interface of key technologies, and the verification of hardware platforms.There are two main research point of this thesis.One is ultra-high-speed wireless LAN enhanced media access control (MAC) layer design and implementation. Since the system only has two scenes, the one is1access point (AP) send to2stations (STA) as broadcasting, the other is bidirectional transmission between1AP and1STA. In order to reduce the complexity of the MAC protocol, system simplify random access section and focus on the multi-service Quality of Service (QoS) guarantee, service data bearer and system performance tuning. In order to support up to1Gbps service data rate, MAC layer uses dual embedded processor hardware architecture with high-speed MAC-PHY interface to provide a guarantee for the high-speed service data transmission. Based on this, the software platform uses VxWorks embedded real-time operating system. High reliable software and deep customization protocol stack can be easily developed by the function interface provided by VxWorks. In the software design process, taking into account the characteristics of the PHY frame structure and the hardware feature of MAC-PHY interface, this thesis presents an efficient MAC layer software program, including sending data, receiving data, data scrambling,data descrambling and multi-service QoS.The other is802.11g wireless LAN architecture design and MAC layer implementation based on software-defined radio (SDR). SDR has become the direction of the future development of wireless communication technology, balancing the contradiction between the physical layer performance and cross-layer coupling degree, this thesis creatively presents a DSP-based802.11g wireless (DCF) LAN implementation. The main achievement of program distributed coordination function modules and part of the physical layer functions802.11g MAC layer technology to achieve interoperability between SDR platform and the commercial terminal, the completion of the transmission of multimedia video streams.