Authors : G.Nagarajan , Didde Vijayakumar and T.G.Palanivelu
Abstract: In wireless asynchronous transfer mode (WATM) networks, an efficient error control scheme is needed to mitigate the errors caused by the radio channel because the radio channel is characterized with more variable error rate. In this paper Early-Stop automatic repeat request (ARQ) scheme is used along with the hybrid multilevel error control (HMEC) for WATM networks. In this scheme, the source traffic is segmented into a number of blocks each with m cells, and then encoded into k cells. Here k is greater than m. At the receiver, the original information can be reconstructed from m out of k correctly received cells. The ARQ protocol will work only when, less than m out of k cells received correctly at the receiver. Using the early-stop ARQ, the transmission of one block may be finished as long as m out of the k cells is received correctly by using "stop sending" signal. So the redundant cells will not be transmitted always in the low error rate channels. The performance analysis of this protocol involves, finding the probability of decoding failure at receiver and finding the effect of m and k values on throughput efficiency. The analysis is carried out for AWGN (Additive White Gaussian Noise) channel with and without delay constraints.
G.Nagarajan , Didde Vijayakumar and T.G.Palanivelu , 2004. Analysis of Early-Stop Arq Protocol for Watm Networks in Awgn Channel . Asian Journal of Information Technology, 3: 971-974.