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In this paper, we describe an DSP based implemented QPSK receiver prototype for 25 kHz carrier frequency and 5 kHz symbol rate with excess bandwidth 0.35, and its test results at the very shallow water of the South Sea of Korea. The implemented digital receiver prototype for underwater communication is composed of analog and digital signal processing parts. The analog part, composed of an implemented...
In this paper, a front-end of digital receiver with 25 kHz carrier frequency, 5 kHz symbol rate, and any excess-bandwidth of pulse shaping filter is designed using two basic facts. The one is the analog-to-digital converting characteristics that the sampled sequence makes its replicas on the frequency domain and might not be suffered from the aliasing although its sampling rate is lower than the Nyquist...
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