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.

在水下通信中，主要问题是信道变化、传播延迟和多径传输路径变化、长距离传输中传输信号的衰减。尽管大陆通信在许多地方使用，但水下通信最近在一些重要地方开始采用。其背后的原因是使用音频波而不是具有低数据速率的 EM 波。因此，本文介绍了一种具有 Polar Run Limited 编码器（PRLE）方案的新型水声 OFDM 通信，并与各种现有方法进行了比较。PRLE 在码本的帮助下在发送端和接收端对数据进行编码，检索原始信息。FWFT 的主要概念是减小规模和复杂性以实现高性能 UW-OFDM 系统。建议的 PRL 解码取决于码本信息，因此 UW 传输不需要信道状态信息 (CSI)。仿真结果表明，与CRC后卷积编码方法相比，BER值降低到78%，与基于FFT的变换技术相比，复杂度降低了21%。因此，该提议的系统实现了更低的误码率、低 SNR 和低复杂度的系统，可以改善 MIMO 系统操作。