Abstract
The nature of the multipath channel and the peak-to-average power ratio (PAPR) are regarded as the main challenges restricting the design of a multicarrier reliable underwater acoustic (UWA) communication. This paper proposes a new scheme, precoded index modulation orthogonal frequency division modulation spread spectrum (IM-OFDM-SS), for UWA communication. The precoded IM-OFDM-SS is proposed to increase the transmission efficiency and exploit the spreading and multipath diversities and, at the same time, reduce the PAPR to achieve a reliable communication system. Two different precoders, discrete Hartley transform (DHT) and discrete cosine transform (DCT), are utilized in the proposed scheme and compared with the conventional IM-OFDM-SS scheme. Simulation and real experimental results demonstrate the outperformance of the proposed precoded IM-OFDM-SS in comparison to the conventional benchmarks in terms of PAPR and bit error rate (BER) performance.
Highlights
An underwater acoustic (UWA) channel is regarded as one of the most complicated media in use due to its challenging effects
Inserting additional overhead packets might lead to deteriorating the structure of the Xtransform matrix. Motivated by those advantages offered by IM-Orthogonal frequency division multiplexing (OFDM)-SS and X-transform index modulation OFDM (IM-OFDM)-SS, the contribution of this paper is to propose a new scheme called precoded IMOFDM-SS to maximize the efficiency of the limited bandwidth of the UWA channel, decrease the higher peak-to-average power ratio (PAPR), and suppress the residual intercarrier interference (ICI)
This paper proposed a new scheme called precoded IMOFDM-SS for UWA communication
Summary
An underwater acoustic (UWA) channel is regarded as one of the most complicated media in use due to its challenging effects. The maximal ratio combining (MRC) detector can straightforwardly be employed at the receiving end for performing low-complex detection as well as avoiding the issues of the ML detector related to the channel estimation susceptibility [18] Despite those advantages, IM-OFDM-SS and OFDMIM inherit the high PAPR from conventional OFDM systems. Inserting additional overhead packets might lead to deteriorating the structure of the Xtransform matrix Motivated by those advantages offered by IM-OFDM-SS and X-transform IM-OFDM-SS, the contribution of this paper is to propose a new scheme called precoded IMOFDM-SS to maximize the efficiency of the limited bandwidth of the UWA channel, decrease the higher PAPR, and suppress the residual ICI.
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