Doctoral Dissertations


Weimin Duan

Keywords and Phrases

Adaptive Equalization; Multiple-Input Multiple-Output; Turbo Equalization; Underwater Wireless Communications


"This dissertation proposes three low-complexity iterative receiver algorithms for multiple-input multiple-output (MIMO) underwater acoustic (UWA) communications. First is a bidirectional soft-decision feedback Turbo equalizer (Bi-SDFE) which harvests the time-reverse diversity in severe multipath MIMO channels. The Bi-SDFE outperforms the original soft-decision feedback Turbo equalizer (SDFE) while keeping its total computational complexity similar to that of the SDFE. Second, this dissertation proposes an efficient direct adaptation Turbo equalizer for MIMO UWA communications. Benefiting from the usage of soft-decision reference symbols for parameter adaptation as well as the iterative processing inside the adaptive equalizer, the proposed algorithm is efficient in four aspects: robust performance in tough channels, high spectral efficiency with short training overhead, time efficient with fast convergence and low complexity in hardware implementation. Third, a frequency-domain soft-decision block iterative equalizer combined with iterative channel estimation is proposed for the uncoded single carrier MIMO systems with high data efficiency. All the three new algorithms are evaluated by data recorded in real world ocean experiment or pool experiment. Finally, this dissertation also compares several Turbo equalizers in single-input single-output (SISO) UWA channels. Experimental results show that the channel estimation based Turbo equalizers are robust in SISO underwater transmission under harsh channel conditions"--Abstract, page iv.


Zheng, Y. Rosa

Committee Member(s)

Moss, Randy Hays, 1953-
Çetinkaya, Egemen K.
Zawodniok, Maciej Jan, 1975-
Cheng, Maggie Xiaoyan


Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering


Missouri University of Science and Technology

Publication Date

Summer 2016

Journal article titles appearing in thesis/dissertation

  • Bidirectional soft-decision feedback turbo equalization for MIMO systems
  • Efficient adaptive turbo equalization for MIMO underwater acoustic communications
  • Block iterative FDE for MIMO underwater acoustic communications
  • Experimental evaluation of turbo receivers in single-input single output (SISO) underwater acoustic channels


xi, 119 pages

Note about bibliography

Includes bibliographic references.


© 2016 Weimin Duan, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Subject Headings

MIMO systems -- Design
Wireless communication systems
Underwater acoustics -- Mathematical models
Feedback control systems

Thesis Number

T 10952

Electronic OCLC #