A Novel UC-OFDM Framework Design Based on Polar-Run-Limited Encoding (PRLE) Scheme and FWFT

In Underwater communication, the main issues are channel variation, propagation delay, and multipath transmission path variation, attenuation of transmitted signal over a long-distance transmission. Even though continental communication is used in many places, underwater communication has recently been adopted in important places. The reason behind it is using audio waves instead of EM wave which has a low data rate. Hence, a novel underwater acoustic OFDM communication is introduced in this paper with the Polar Run Limited encoder (PRLE) scheme and compared with various existing methods. PRLE encodes the data on the transmitter side and at the receiver side with the help of the codebook, the original information is retrieved. The main concept of FWFT is it reduces size and complexity in order to achieve a high-performance UW-OFDM system. The proposed PRL decoding depends on the codebook information, hence the channel state information (CSI) is not needed for UW transmission. The simulation result shows that the BER value is reduced to 78% when compared with CRC followed convolution encoding method and complexity reduced by 21% compared with FFT based transform technique. As a result, this proposed system has achieved a less BER, low SNR, and low complexity system which can improve the MIMO system operation.