IEEE 802.11a中QPSK解调的FPGA设计与实现
Design and Realization of Demodulation of QPSK with FPGA in IEEE 802.11 a
丁大尉 胡国英 晋刚 金涛斌
分析了IEEE802.11a中QPSK信号的调制解调原理,给出了一种针对2个支路的FPGA解调的实现方案,并对解调方案进行了软件仿真,得到了正确结果.在此基础上,以EPF10K30AQC208-3芯片作为主芯片,完成了验证调制解调过程的硬件电路设计,并制作电路板硬件实现了该解调过程,经滤波器滤波后从其实部和虚部两路输出得到了正确结果、文中以FPGA为处理器,提出并验证了一种实现物理层中QPSK信号的2个支路解调的新方案.
基于IEEE 802.11a的OFDM同步系统设计与实现
Design and Realization of the Synchronization System for OFDM Based on IEEE 802. 11a
刘晓明 李永波 吴浩威
OFDM技术以他在多径和窄带干扰方面的良好性能以及高频谱利用率得到广泛应用,并成为第四代移动通信的核心技术,但是OFDM对同步非常敏感。研究了各种同步因素对系统的影响,通过仿真设计了一种基于IEEE 802.11a的OFDM宽带数据通信同步系统的设计方案,并在FPGA上实现了系统设计。
QoS Guarantee for IEEE 802.11a Based Mobile Ad Hoc Networks
YAOZhongbang CAOZhigang
In this paper, we propose a Distributed scheduling and optimization scheme (DSOQoS) for QoS guarantee in IEEE 802.11a based MANETs. In DSOQoS, for each station, the network layer takes different scheduling actions according to its local channel conditions estimated by the MAC layer, and the MAC layer takes different packet transmission actions based on the network load conditions estimated by the network layer. The optimizations are based on the following information sharing and interaction: traffic types, QoS parameters, network packet timeout periods, and predicted packet transmission periods. We evaluate the scheme under different network loads and different station moving speeds. The simulation results show that DSOQoS can guarantee the QoS requirements in terms of packet delivery ratio, packet delay and delay jitter.
路,渐行渐宽——15款无线路由器评测专题
Wireless Router
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电子电气工程师协会(IEEE,Institute of Electrical and Electronlcs Engineers)发布IEEE 802.11标准开始,一路走来现在刚好是第十个年头。IEEE 802.11a、IEEE 802.11b和IEEE 802.11g三个标准的成功推行,……
802.11a WLAN系统的帧同步检测方法
An Efficient Frame Detection Synchronization Technology for IEEE 802.11a Wireless LAN System
高音 焦李成 马凤国
提出了一种适用于IEEE 802.11a WLAN(Wireless LAN,无线局域网)系统的帧检测时域同步技术,在使用门限机制的延时相关帧检测的基础上,利用短训练符号的互相关信息共同来完成802.11a帧的同步检测。