Implementation and throughput optimization of various ARQ mechanisms in different channels

Abstract

Automatic Repeat Request (APC) is a suitable solution for reliable data communication over wireless channel. But the main challenge is to achieve optimized throughput in error free data delivery. Several researchers are still working to solve this issue. This work is a humble approach to address the problem and find out a better solution in wireless data communication. Different modified techniques of ARQ are addressing the above said problems and comparative study of different Aggressive Packet Combining (APC) schemes has been done to understand the better approach. During this course of investigation it has been realized that achieving optimized energy and bandwidth is also playing a major role. During the data transmission, noise and different issues raises the problem of fading, it is also required to check the behaviour of different scheme in various fading channels. The combined ARQ and Forward Error Correction (FEC) technique is called Hybrid Automatic Repeat Request (HARQ) which is also a significant technique to solve the wireless data communication short comings. The behaviour of HARQ is studied in Rayleigh Fading Channel and comparative studies have also shown better results. The mathematical representation of few modified APC scheme was needed. newlineThe mathematical modelling was needed for comparative study on throughput. Besides the major drawback of APC scheme was same bit location error detection as the foundation concept is majority bit logic. This issue has been addressed through different basic cyclic bit shift approach. Thus a new protocol is proposed based on cyclic shift to combat the problem associated with same bit location error detection in APC. newline newline