Parity retransmission hybrid ARQ using rate 1/2 convolutional codes on a nonstationary channel

• Main Authors: LUGAND, L. R., Costello, Jr., D. J., DENG, Robert H.
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 1989
• Subjects: Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/105; https://ink.library.smu.edu.sg/context/sis_research/article/1104/viewcontent/Parity_Retransmission_Hybrid_ARQ_ssing_Rate.pdf
• Institution: Singapore Management University

A parity retransmission hybrid automatic repeat request (ARQ) scheme is proposed which uses rate 1/2 convolutional codes and Viterbi decoding. A protocol is described which is capable of achieving higher throughputs than previously proposed parity retransmission schemes. The performance analysis is based on a two-state Markov model of a nonstationary channel. This model constitutes a first approximation to a nonstationary channel. The two-state channel model is used to analyze the throughput and undetected error probability of the protocol presented when the receiver has both an infinite and a finite buffer size. It is shown that the throughput improves as the channel becomes more bursty