Reduction of Propagation Delay by Implementing OFDM with BPSK Technique for Shallow Water Acoustic Communication

Orthogonal frequency division multiplexing (OFDM) is a modulation technique that is used to reduce propagation delay. OFDM can be used in combination with coding techniques such as BPSK or QPSK to increase data rates and reduce propagation delay. Propagation delay occurs when a signal is transmitted over long distances by distributing the signal over multiple subcarriers and each subcarrier is modulated with a low-rate digital signal. This signal is then combined with the higher rate modulation signal before being transmitted. By increasing the frequency of the signal, the time taken to transmit the signal is reduced. This can result in a significant reduction in propagation delay. It is important to note that this technique is not limited to radio communication but can also be applied to other mediums of transmission such as cable, optical fiber, and satellite communication. The use of OFDM with BPSK can reduce propagation delay significantly, allowing data-rates of up to 10 Mbps to be achieved.