Queuing Model And Numerical Analysis At Relay Node Based On Packets In A Batch Arrival On Cooperative Diversity Wireless Networks

High-speed,reliable and instant data transmission are the key requirements for the wireless communication system.Using the error-control technology,link adaptation and anti-fading techniques to solve the multi-path fading,Doppler frequency shift and other problems in the process of communication can guarantee the high rate,reliability and spectrum utilization of the system.The combination of the automatic retransmission request,adaptive modulation and coding and cooperative diversity,and the study of the relay performance of the data packets at the system relay based on the queuing theory are the foundation of further research of the overall performance of cooperation communication system.There are two streams of the input data at the relay.One is from the source while the other is from the relay itself.So,the relay node has multiple input and the packets arrival is a batch arrival.In this paper,a three-node Decode-and-Forward(DF)cooperative diversity network model with GBN-ARQ protocol is proposed to analyze the queueing performance of the packets at relay node with multiple input source.The main work is as follows:Firstly,link adaptation technique is allowed at the physical layer and the wireless channel of single relay cooperative diversity system is modeled.The channel feature is captured by a Finite State Markov Chain(FSMC).Secondly,basing on the queuing theory and the character of GBN-ARQ protocol,the inputs to the queue of the relay contain two streams.The stream from the source to the relay has a batch arrival,the relay itself is assumed as Bernouli processes.Then analyze the major factors affecting residence time of the packets were discussed,considering the problem that packets in a batch arrival at relay.Thirdly,Assume the feedback delay is fixed,then a Markov model of packet transmission from relay node to destination node was established and the system state was deduced as a G/M/l type Markov chain,and the delay statistics at relay node were figured out by using matrix geometric methods.In this paper,the calculated data and the results are quite accurate,it provides a reliable method for the calculation of data traffic in wireless network delay and offers a diversity of choice for the arrival process of packets.Then the statistics of the total delay experienced by the packets at the relay and the system parameters,which control the delay performance and queue length,etc,were discussed qualitatively in chapter 4.The theoretical derivations and queuing model are validated by experimental results.