Xu Chunxiu

Design and Realization of a Novel Multi-path Load-Balancing Routing Protocol in Ad Hoc Network

A load-balancing scheme has a significant effect on the performance of the multi-path routing protocol, especially in an ad hoc network environment. In order to analyze the effect on the distribution of input traffic among multiple paths in AODV-MP (Ad Hoc On-Demand Distance Vector Routing with Multi-Path), first of all, we give the essence of the AODV-MP, and then we design and realize a load-balancing algorithm based on AODV-MP made up of independent nodes, which source node distributes packets reasonably in the several paths according to the load state of the network. Finally we will employ OPNET to simulate the Multi-path routing protocol with load-balancing algorithm. Results of the simulation show that the load-balancing protocol can alleviate the congestion, decrease the end-to-end delay and increase the packet delivery ratio and throughput, thus the performance of multi-path routing protocol can be improved consequently.

Measurement-based tapped-delay-line (TDL) models for wireless channels under high speed railway scenarios at 2.6 GHz

The dramatic development of high speed railway (HSR) has spurred great interest in extensive studies on the fading characteristics of the radio channel in all the relevant scenarios. Approved by the Ministry of Railways of China, single input single output (SISO) measurements were performed at 2.6 GHz with 40 MHz bandwidth along the Harbin-Dalian passenger dedicated railway line. In this paper, we provide some fading parameters including the mean excess delay, root-mean-square (RMS) delay spread, the number of paths and the delay Doppler spectrum under diverse HSR scenarios. Plain, viaduct and hilly terrain scenarios are all involved. Based on the extensive body of measured data, tapped-delay-line (TDL) models are established to characterize the time-varying wireless channel, which can be directly employed in the evaluation and comparison of various HSR transmission projects. All these results and models are expected to provide an insight into the behaviors and performance of wireless cellular communication in HSR scenarios.