An OFDM-based Transmission Scheme for Underwater Acoustic Multimedia

In this paper, we propose an orthogonal frequency division multiplexing–based (OFDMbased) underwater acoustic multimedia system. An essential feature of this system is that it offers greater power and schemes with significant error protection for the transmission of sensor data information requiring a higher quality of service (QoS). To realize maximum resource utilization or minimum total transmission power, we also include an adaptive modulation strategy into the system. The proposed underwater acoustic multimedia system employs high power, low speed modulation, and schemes providing significant error protection for the transmission of sensor data messages requiring a stringent bit-error rate (BER). In contrast, low power, high speed modulation, and less capable error protection schemes are provided for messages that can tolerate a high BER. A simulation was carried out to verify the functionality of the proposed system in a practical underwater acoustic multimedia scenario. Key-Words: underwater multimedia, acoustic, OFDM, QoS, power assignment, unequal error protection, adaptive modulation.