TY - GEN
T1 - MIMO TFT-OFDM for Underwater Acoustic Communication with Bidirectional Soft Decision Feedback Equalization
AU - Ye, Zihao
AU - Yan, Shefeng
AU - Yang, Binbin
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - Conventional underwater acoustic multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system adopts orthogonal pilots, which leads to low spectral efficiency. In this paper, we propose an iterative time-frequency training OFDM (TFT-OFDM) scheme for underwater acoustic MIMO systems to improve spectral efficiency. Each TFT-OFDM symbol contains the time-domain training sequence and frequency-domain orthogonal pilots. The time-domain training sequence is used to estimate the path delays without eliminating the influence of OFDM symbols. By using the estimated path delays and the sparse characteristics of the underwater acoustic channel, the path amplitudes can be obtained with fewer pilots. In addition, the bidirectional soft decision feedback equalizer (BiSDFE) is introduced into the underwater acoustic MIMO system. BiSDFE eliminates intercarrier interference from both directions by combining the results of forward and backward decision feedback equalization to mitigate error propagation. Simulation results demonstrate that the proposed MIMO TFT-OFDM system achieves better bit error rate (BER) performance and higher spectral efficiency than the MIMO ZP-OFDM system.
AB - Conventional underwater acoustic multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system adopts orthogonal pilots, which leads to low spectral efficiency. In this paper, we propose an iterative time-frequency training OFDM (TFT-OFDM) scheme for underwater acoustic MIMO systems to improve spectral efficiency. Each TFT-OFDM symbol contains the time-domain training sequence and frequency-domain orthogonal pilots. The time-domain training sequence is used to estimate the path delays without eliminating the influence of OFDM symbols. By using the estimated path delays and the sparse characteristics of the underwater acoustic channel, the path amplitudes can be obtained with fewer pilots. In addition, the bidirectional soft decision feedback equalizer (BiSDFE) is introduced into the underwater acoustic MIMO system. BiSDFE eliminates intercarrier interference from both directions by combining the results of forward and backward decision feedback equalization to mitigate error propagation. Simulation results demonstrate that the proposed MIMO TFT-OFDM system achieves better bit error rate (BER) performance and higher spectral efficiency than the MIMO ZP-OFDM system.
KW - Decision feedback equalization
KW - Iterative receiver
KW - MIMO- OFDM
KW - Underwater acoustic communication
KW - time-frequency joint channel estimation
UR - http://www.scopus.com/inward/record.url?scp=85146424573&partnerID=8YFLogxK
U2 - 10.1109/ICSPCC55723.2022.9984271
DO - 10.1109/ICSPCC55723.2022.9984271
M3 - Conference contribution
AN - SCOPUS:85146424573
T3 - 2022 IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2022
BT - 2022 IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE International Conference on Signal Processing, Communications and Computing, ICSPCC 2022
Y2 - 25 October 2022 through 27 October 2022
ER -