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This paper proposes a soft direct-adaptation based bidirectional turbo equalizer for multiple-input multiple-output underwater acoustic communication systems. Soft, rather than hard, direct-adaptation based equalizer combined with the fast self-optimized least mean square algorithm is employed to achieve a faster convergence rate, and the second-order phase-locked loop is embedded into the equalizer...
A direct-adaption based bidirectional turbo equalizer (DA-BTEQ) is proposed for multiple-input multiple output (MIMO) underwater acoustic (UWA) communications. Abandoning the traditional channel estimation process, the proposed DA-BTEQ works in a direct-adaption mode and is implemented with bidirectional soft-decision feedback equalizer (SDFE) to suppress error propagation. The diversity gain is exploited...
In-band full duplex (IBFD) can theoretically double the throughput of communication systems, and its feasibility has been demonstrated in wireless radio design. It is a promising alternative for the severely bandwidth-limited underwater communication system since it exploits both the temporal and spectral efficiency to the most. Self-interference cancelation is the primary challenge in IBFD's implementation...
A bidirectional blind equalization based on the constant modulus algorithm (CMA) and subspace-based algorithm (SBA) is proposed in this paper. Without any training sequence or channel estimation, blind equalization improves the transmission efficiency significantly in underwater acoustic communications. The combining scheme in which two outputs run in opposite directions exploits the diversity and...
The bidirectional fractionally-spaced decision feedback equalizer (DFE) based on the soft outputs combination is proposed. Without any channel estimation, the fractionally-spaced DFE effectively compensates for any phase distortion and suppresses the error propagation. Compared to conventional methods, the soft outputs combining scheme involving the log likelihood ratios (LLRs) of two DFEs outputs...
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