共查询到12条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
5.
6.
7.
同步是OFDM系统中至关重要的一个环节,目前已有很多针对OFDM系统的同步算法,大致可以分为3类:基于嵌入符号中的导频、基于前导序列和基于循环前缀。提出了具体针对IEEE802.11a帧结构的同步算法(包括时间定时和频偏估计及纠正)。详细阐述了该算法各个模块FPGA的具体实现,具有复杂度低,便于工程实现的特点。 相似文献
8.
基于IEEE 802.11a的OFDM系统信道估计算法研究及实现 总被引:1,自引:1,他引:0
无线信道的复杂性和随机性使得信道估计在无线通信系统中的作用尤为重要。针对IEEE 802.11a协议以及无线衰落信道的特点,在MATLAB环境下建立系统仿真模型,采用相应的信道估计算法进行仿真。通过对算法性能以及复杂度的比较选择合适算法并在此基础上对算法进行改进。将改进后的算法在FPGA硬件平台上实现。仿真结果表明,该算法是一种较为理想的信道估计实现方案,具有较好的实用价值。 相似文献
9.
无线信道的复杂性和随机性使得信道估计在无线通信系统中的作用尤为重要。本文针对IEEE802.11a协议以及无线衰落信道的特点,在matlab环境下建立系统仿真模型,采用相应的信道估计算法进行仿真。通过对算法性能以及复杂度的比较选择合适算法并在此基础上对算法进行改进。将改进后的算法在基于FPGA硬件平台上实现,硬件仿真结果表明,该算法是一种较为理想的信道估计硬件实现方案,具有较好的实用价值。 相似文献
10.
11.
This paper presents a novel analytical model and an efficient admission control (AC) algorithm for IEEE 802.11 distributed coordinated function access mechanism. In contrast to the previous approaches, both saturated and unsaturated states of network are analyzed and the impacts of error‐frame rate and retransmission limit are also taken into account based on an improved Markov chain model. Thus, the network resources can be efficiently utilized. Taking the throughput difference between saturated and unsaturated states as the residual bandwidth, an efficient AC algorithm is designed to utilize the network resources effectively. Extensive simulation data match our analytical results and demonstrate that the AC algorithm is efficient and can make the effective utilization of network resources. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
12.
Xiao Wan'ang Fang Zhi Shi Yin 《电子科学学刊(英文版)》2007,24(2):232-237
The implementation method of the IEEE 802.11 Medium Access Control (MAC) protocol is mainly based on DSP (Digital Signal Processor)/ARM (Advanced Reduced instruction set computer Machine) processor or DSP/ARM IP (Intellectual Property) core. This paper presents a method based on Nios II soft-core processor embedded in Altera's Cyclone FPGA (Field Programmable Gate Array) and MicroC/OS-II RTOS (Real-Time Operation System). The benefits and drawbacks of above methods are compared, and then the method presented in this paper is described. The hardware and software partitioning are discussed; the hardware architecture is also illustrated and the MAC software programming is described in detail. The presented method has some advantages, such as low cost, easy-implementation and very suitable for the implementation of IEEE 802.11 MAC in research stage. 相似文献