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Description: ns2 source code for dmac protocol
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Size: 11053056 |
Author: Rahul |
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Description: Learning about mac layer protocol for wireless sensor network
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Size: 314368 |
Author: mehdi |
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Description: 本文着重研究网络中使用的MAC协议对语音传输过程的影响，以及无线传
感器网络中适用的语音编码算法。本文首先综述了现有无线传感器网络中常用
的MAC协议，对这些协议进行了分析比较。提出了一种新的基于TDMA的MAC
协议VR-TDMA，为了测试提出的协议性能，在NS2仿真平台上对该协议进行
了仿真，结果证明该协议具有良好的实时性能。然后研究了几种常用语音编码
算法的性能，通过比较研究，认为ADPCM语音编码算法的性能符合无线传感
器网络应用的要求，并对该算法进行了简化，减少了算法运行的计算量。实际
测试表明，算法具有良好的性能。
-In this paper,we concentrate on the mac protocols of wireless sensor networks，
especially the impact imposed on speech transmition．We also want to find a speech
coder which is fit for wireless sensor networks．Firstly,we intorduce the existing mac
protocol，such aS IEEE802．1 1，SMAC protocol，TRAMA protocol，DMAC protoc01．
Moreover we analyse and make comparison of them．Secondly，we propose a new
mac protocol named VR-TDMA．Simulation in NS2 proves that this protocol Canhave pleasing performance in real．time application．Thirdly,we
make a comparison
of some famous speech encoders．The result indicates that ADPCM(Adaptive
Di脏rential Pulse Code Modulation)is simpler than advanced low bit。rate VOICe
coding techniques and doesn’t require as heavy caculations．In this work，We simplify
the algorithm in order tO make it fit for the networks beaer．Actual tests prove that
this simplified algorithm work well in wireless sensor networks．
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Size: 3294208 |
Author: 曾晓丽 |
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Description: 本文我们提出了DMAC，一种能量高效和低时延的MAC协议，设计的目标是适应这种数据采集树。我们首先指出以往的MAC协议有数据前传的中断问题，不是所有在多跳路径上的节点知道数据传递的进程，造成了很大的睡眠延时。DMAC解决了中断问题，并允许了连续的包传递，这依靠了节点交错的睡眠调度机制。-Yī zhǒng néngliàng gāoxiào hé dī shí yán de MAC xiéyì, shèjì de mùbiāo shì energy efficient and low latency MAC protocol design goal is to adapt to this data collection tree
Platform: |
Size: 123904 |
Author: 曾晓丽 |
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Description: 该代码实现了一个基于Wishbone总线协议的DMA控制器，由于SOC可集成的模块越来越多，本文设计的DMAC包含了31个可编程的DMA通道，能够处理多个DMA传输请求。由于数据在Wishbone总线上传输，在总线接口方面，本文设计的DMAC提供了两个既可以作为主机接口又可以作为从机接口的Wishbone接口。当有多个外设同时发出DMA请求时，本文设计的DMAC采用循环优先级和动态优先级相结合的方式，实现了通道仲裁器二级仲裁的功能。为了提高传输效率，本文设计的DMAC不仅支持数据块的传输，还支持高效的分散/集中DMA传输方式。(In this thesis, after in-depth understanding of Wishbone bus protocol and DMA technology, present a design concept of a DMAC integrated into a Wishbone bus based SOC. The DMAC designed in this thesis contains thirty-one programmable DMA channels, which can handle multiple DMA transfer request. As the data is transmitted over the Wishbone bus, the DMAC provides two Wishbone interfaces that can act as a host interface or as a slave interface. When several peripherals issue DMA transfer request at the same time, the DMAC adopts the combination of cyclic priority and dynamic priority to realize the secondary arbitration function of channel arbiter. In order to improve the transmission efficiency, the DMAC not only supports the transmission of data blocks, but also supports efficient scatter/gather DMA transfer mode.)
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Size: 74752 |
Author: Tensor_org |
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