Pub Date : 2014-10-25DOI: 10.3979/J.ISSN.1673-825X.2014.05.006
Xin Yang, Yujun Kuang, J. J. Kponyo
The performance of the current location-based routing protocol such as GPSR (greedy perimeter stateless routing) is easily influenced by the rapid movement of destination node. To solve this problem, the RSDLS (routing strategy with distributed location service) is proposed. In RSDLS, DLSs (distributed location servers) are deployed at particular intersections to assist routing. Each DLS keeps records of local nodes within domain range in LNT (local node-location table), and shares LNT among neighbor location servers and maintains several NTs (neighbor tables). Based on the location tables mentioned above, the sender node forwards the data packet to the local location server in premier by GPSR, and the local location server makes the following forwarding decision according to the records of destination node in LNT or NT. The results shows that the RSDLS can achieve a better packet delivery ratio and a lower routing overhead, and is more suitable for VANET (vehicle ad hoc network) where network topology is changed rapidly.
当前基于位置的路由协议，如贪婪周边无状态路由(GPSR)，其性能容易受到目的节点快速移动的影响。为了解决这一问题，提出了分布式位置服务路由策略(RSDLS)。在RSDLS中，dls(分布式位置服务器)被部署在特定的十字路口以辅助路由。每个DLS将域范围内的本地节点记录保存在LNT(本地节点位置表)中，并在邻居位置服务器之间共享LNT，维护多个nt(邻居表)。基于上述位置表，发送节点首先通过GPSR将数据包转发给本地位置服务器，本地位置服务器根据目的节点在LNT或NT中的记录做出以下转发决策。结果表明，RSDLS可以实现更好的数据包传送率和更低的路由开销，更适合于网络拓扑变化较快的VANET (vehicle ad hoc network)。
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Pub Date : 2013-08-25DOI: 10.3979/J.ISSN.1673-825X.2013.04.004
Zhenbin Gao, Xiaozhe Liu, Na Zheng
The feasibility of using Duffing chaotic oscillator to detect the weak sinusoidal signal is testified and the performance is analyzed. The method of using the pair of extreme values of the system output variance to detect the weak signal is proposed. The influence of sampling frequency on the results is analyzed based on the theory that the output variance value of the system will reach a maximum when the signal frequency is equal to the reference frequency. Experiments have indicated that the weak signal will be detected in the lower signal to noise ratio SNR =-45 dB by increasing the sampling frequency and the length of the data sequence in the meanwhile. Moreover, the signal which has a random phase difference with the reference signal can also be detected based on the above theory, the experiments results have verified that the variance still has a dramatic change when the signal frequency is approximately equal to the reference frequency, and there appears a maximum value and a minimum value. This new property is successfully applied to measuring the frequency of amplitude modulated signal produced by the signal generator.
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