پروتکل های درخواست تکرار خودکار ترکیبی
Abstract
1-Introduction
2-System model and outage probability analysis
3-Establishment and Analysis of System Model
4-System performance analysis
5-System performance simulation and evaluation
6-Conclusions
Acknowledgement
References
Abstract
Hybrid Automatic Retransmission reQuest (HARQ) protocol can effectively compensate the signal transmission error caused by complex time-varying channels and multi-path effects of wireless communication networks. This paper analyzes and compares the principle and system performance of three HARQ protocols from the perspective of system outage probability, and the expressions of system throughput and energy efficiency are derived by establishing a one-dimensional Discrete Time Markov Chain (DTMC) and calculating the steady-state distribution. MATLAB numerical simulations are applied to evaluate and compare the performance superiority among three HARQ Protocols.
Introduction
Various factors such as noise interference, multi-path effects, shadow effects and complex time-varying channels cause the instability of wireless communication, inducing the phenomenon of communication interrupt when the channel is in a deep fading state, which seriously affects the system performance and Quality of Service of the network. Therefore, effective and reliable error control technology is one of the important means to improve system performance. In the wireless communication network, two of the most popular error control technologies are Automatic Retransmission reQuest (ARQ) protocol and Forward Error Correction (FEC), the former aims at recovering error data frames through performing the feedback responses and data retransmissions between the sender and receiver, and the latter is mainly focused on comparing the redundancy code between the two ends to detect the accuracy of received data. Much works demonstrated their superiority in error control 1.