Experimental Evaluation of Turbo Receivers in Single-Input Single-Output Underwater Acoustic Channels


This paper presents some experimental results on both the channel estimation based minimum mean square error Turbo equalizer (CE MMSE-TEQ) and the direct-adaptation turbo equalizer (DA-TEQ) in single-input single-output (SISO) underwater acoustic (UWA) channels. For CE MMSE-TEQ, we compare the soft-decision feedback Turbo equalizer (SDFE), the bidirectional soft-decision feedback Turbo equalizer (Bi-SDFE) and the classic linear Minimum Mean Square Error (MMSE) Turbo equalizer in terms of bit error rate (BER) performance. For DA-TEQ, the recently proposed soft-decision direct-adaptation TEQ (Soft DA-TEQ) is evaluated with the same set of experimental data. Both QPSK and multilevel modulations (8PSK and 16QAM) have been tested with the symbol rate of 9.77 ksymbols/s. Experimental results show that the CE-TEQs are more robust in SISO underwater acoustic transmission under harsh channel conditions. Especially, with low pilot overheads, the recently proposed Bi-SDFE achieved low BER performance in all cases.

Meeting Name

OCEANS '16 MTS/IEEE Shanghai (2016, Apr. 10-13, Shanghai, China)


Electrical and Computer Engineering


National Science Foundation (U.S.)


This work is supported in part by the National Science Foundation grant ECCS1408316 of the United States.

Keywords and Phrases

Adaptive systems; Bit error rate; Channel estimation; Equalizers; Error statistics; Errors; Fading channels; Mean square error; Signal receivers; Telecommunication repeaters; Bit error rate (BER) performance; Experimental evaluation; Linear minimum mean square errors; Minimum mean square errors; Single input single output; Turbo equalizations; Underwater acoustic channels; Underwater acoustic communications; Underwater acoustics; Single-Input Single-Output; Turbo equalization

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Document Type

Article - Conference proceedings

Document Version


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© 2016 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Apr 2016