MATLAB Implementation and Analysis of ARQ Protocols

This article presents an in-depth analysis of three Automatic Repeat reQuest (ARQ) methods: Go-Back-N, Selective Repeat, and Stop-and-Wait protocols. These techniques are essential for handling transmission errors and data loss in communication systems. We examine the underlying principles and operational scenarios for each method, supported by practical MATLAB implementations that include frame sequencing algorithms, acknowledgment handling mechanisms, and timeout management functions. The MATLAB code incorporates error detection routines using CRC checks and implements retransmission strategies through state machine controllers. Each protocol's performance is evaluated through simulation metrics including throughput efficiency and latency measurements. The programs have been rigorously validated through comprehensive testing with various error patterns and channel conditions, ensuring reliability and stability. Our implementation demonstrates how to configure protocol parameters such as window size for Go-Back-N, buffer management for Selective Repeat, and timer settings for Stop-and-Wait. Through detailed research and practical implementation, we provide insights into ARQ's significance and applications in modern communication systems, with code examples showing real-time performance monitoring and optimization techniques.