Time reversal acoustic communication receivers: DSP implementation and fast channel estimation |
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| Institution: | 1. School of Electronics and Communication Engineering, REVA Institute of Technology and Management, REVA University, Bengaluru, India;2. School of Computing and Information Technology, REVA Institute of Technology and Management, REVA University, Bengaluru, India;3. School of Information Technology, University of Cincinnati, Cincinnati, USA;1. Key Lab of Optical Fiber Sensing and Communications, University of Electronic Science and Technology of China, China;2. School of Information Science and Technology, Southwest Jiaotong University, China;3. Guangdong Institute of Electronic and Information Engineering, UESTC, China;4. School of Computing Science and Engineering, Vellore Institute of Technology (VIT), Vellore-632014, Tamil Nadu, India;5. Xi''an Jiaotong-Liverpool University, China |
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| Abstract: | A communication system is implemented on digital signal processors (DSPs) for the underwater acoustic environment. The implemented receiver uses time reversal multi-channel combining followed by a single-channel decision feedback equalizer. Periodic channel estimation is employed to track the channel fluctuations. These techniques are used to mitigate time-varying inter-symbol interference, which is the main challenge in the underwater acoustic channel at operating frequencies greater than 10 kHz. Various optimization tasks are performed to reduce the receiver computational complexity. A fast implementation of the matching pursuit algorithm is tested on the DSP platform. Its performance, in terms of accuracy and run-time, is compared with that of the basic matching pursuit algorithm. Experimental results of the transmission and demodulation of binary phase-shift keying signals at three different symbol rates were obtained in the local Delaware Bay. The low bit error rates demonstrate the effectiveness of our implementation. |
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| Keywords: | Time reversal Decision feedback equalizer Channel estimation Underwater acoustic communication |
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