What is an ARQ transmission system?

An ARQ (Automatic Repeat reQuest) transmission system is an error correction method primarily used in digital communication systems. In this system, the receiving station continuously monitors the incoming data for any errors that may occur during transmission. When an error is detected, the receiver sends a request back to the sender asking for the specific data packet to be retransmitted. This process ensures data integrity, as it allows the receiver to obtain a correct version of the data, thereby enhancing the reliability of the communication.

In ARQ systems, several types of protocols can be implemented, such as Stop-and-Wait ARQ, Go-Back-N ARQ, and Selective Repeat ARQ, each with their approach to managing retransmissions. The key aspect of ARQ is its feedback mechanism, which plays a critical role in ensuring accurate data transfer in environments where errors can occur due to noise, interference, or other factors.

The other choices do not accurately represent the fundamental characteristics of an ARQ system. For example, the first option suggests a limitation to video signals, which is not relevant to ARQ as it applies to any data transmission. The third option describes a data compression technique that does not align with the error detection and correction function of ARQ. The fourth option