Abstract
Under-Water Acoustic (UWA) communication networks are commonly formed by associating various independent UWA vehicles and transceivers connected to the bottom of the sea with battery-operated power modems. Orthogonal Frequency Division Multiplexing (OFDM) is one of the most vital innovations for UWA communications, having improved data rates and the ability to transform fading channels into flat fading. Moreover, OFDM is more robust on Inter-Symbol and Inter-Carrier Interferences (ISI and ICI respectively). However, OFDM technology suffers from a high Peak to Average Power Ratio (PAPR), resulting in nonlinear distortions and higher Bit Error Rates (BERs). Saving power of battery deployed modems is an important necessity for sustainable underwater communications. This paper studies PAPR in UWA OFDM communications, employing Selective Mapping (SLM) as a tool to mitigate PAPR. The proposed SLM with the oversampling factor method proves to be less complex and more efficient. Simulation results indicate that SLM is a promising PAPR reduction method for UWA OFDM communications reducing BER.
Highlights
Under-Water Acoustic (UWA) wireless communications are utilized in military and civil applications
This paper proposes the utilization of Selective Mapping (SLM) with an oversampling factor in Orthogonal Frequency Division Multiplexing (OFDM) UWA communications to reduce Peak to Average Power Ratio (PAPR) and improve Bit Error Rates (BERs) with lesser complexity
OFDM is considered as an important modulation technique in UWA communication systems, as it can convert frequency www.etasr.com fading channels to flat fading channels
Summary
Under-Water Acoustic (UWA) wireless communications are utilized in military and civil applications. Efficient PAPR reduction techniques could solve this problem without complex hardware, keeping in mind the linear range of the power amplifier before design to avoid the saturation of HPA [12,13,14,15]. PAPR can be reduced by many methods having merits and limitations, as there is always a compromising balance between bandwidth, computational complexity, average power, etc. Many researchers introduced such techniques and classified PAPR into several classes. This paper proposes the utilization of Selective Mapping (SLM) with an oversampling factor in OFDM UWA communications to reduce PAPR and improve BER with lesser complexity
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