Abstract
This paper presents a study of a coded, single-user, direct sequence spread spectrum (DSSS) based system for low-latency underwater acoustic communications using a receiver equipped with a single-hydrophone. Low-latency is achieved by utilizing a short turbo product code (TPC) type of forward error correction (FEC) with a Chase II soft decoder in conjunction with a Quadrature Phase shift Keying (QPSK) modulation scheme. Furthermore, we introduce a novel adaptive chip-level decision feedback equalizer (DFE) receiver with explicit chip-level Doppler, frequency-offset and symbol-timing correction. Experimental results indicate that the proposed receiver can overcome Doppler spreads up to 6 knots and multipath delay spreads in the excess of 180 chips with a processing gain of as low as 7. The achieved effective bit rates of the proposed receiver were 774, 364 and 132 bps for the 7, 15, and 31-chip codes, respectively, over a 4 kHz bandlimited channel.
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