ARQ Protocol Implementation with MATLAB Code

We have successfully implemented the ARQ retransmission technology within the MATLAB programming environment, with test results confirming its operational feasibility. ARQ (Automatic Repeat Request) is a protocol mechanism that automatically detects and corrects transmission errors during data communication. This implementation enhances data transmission reliability by ensuring accurate delivery to destination endpoints. The MATLAB-based implementation involves several key algorithmic components: data packet segmentation using buffer management functions, encapsulation with checksum headers via CRC algorithms, and validation through acknowledgment protocols. The code utilizes timer-based retransmission triggers when acknowledgments are not received within specified timeouts, implementing either Stop-and-Wait or Go-Back-N ARQ variants. Core functions include packet sequencing with sequence number tracking, error detection through cyclic redundancy check (CRC) calculations, and retransmission queue management using FIFO buffers. The implementation handles duplicate packet detection and maintains transmission state machines for connection management. Additionally, the ARQ implementation incorporates sophisticated retransmission mechanisms featuring timeout handlers and negative acknowledgment (NACK) processing to maintain data integrity and consistency. The solution manages transmission windows and implements flow control to optimize network utilization. In summary, ARQ retransmission technology represents a critical data transmission methodology that significantly improves reliability and accuracy, ensuring secure data delivery to intended destinations through robust error control mechanisms implemented in MATLAB.