Block Iterative FDE for MIMO Underwater Acoustic Communications
In this paper, we propose a low complexity iterative detection scheme for the uncoded zero padding (ZP) single carrier (SC) transmission in Multiple-input Multiple-output (MIMO) underwater acoustic (UWA) channels. Due to the long multipath in UWA channels, ZP SC-FDE has to use large block size to achieve low computational complexity and high data efficiency. But, the higher bandwidth efficiency results in more sever channel estimation error and performance degradation. To enhance the performance of the ZP SC systems with high data efficiency, we design a soft-decision block iterative frequency-domain equalization (BI-FDE) combined with iterative channel estimation. With increasing reliability as the the iteration proceeds, the soft decision symbols obtained at the previous iteration are used to re-estimate the channel, thus improving the overall system performance. Since both the feedfoward and feedback filters are designed in frequency domain without the aid of channel coding, the proposed SD BI-FDE scheme is affordable for real-time implementation. The performance enhancement of the proposed iterative receiver has been verified through a pool test.
W. Duan et al., "Block Iterative FDE for MIMO Underwater Acoustic Communications," Proceedings of the 2016 IEEE/OES China Ocean Acoustics Symposium (2016, Harbin, China), Institute of Electrical and Electronics Engineers (IEEE), Jan 2016.
The definitive version is available at https://doi.org/10.1109/COA.2016.7535772
2016 IEEE/OES China Ocean Acoustics Symposium (2016: Jan. 9-11, Harbin, China)
Electrical and Computer Engineering
Keywords and Phrases
Carrier communication; Channel estimation; Codes (symbols); Efficiency; Equalizers; Feedback control; Frequency domain analysis; Frequency estimation; MIMO systems; Real time control; Telecommunication repeaters; Channel estimation errors; Frequency domain equalization; Iterative channel estimation; Low computational complexity; Performance enhancements; Real-time implementations; Single carrier transmission; Underwater acoustic communications; Underwater acoustics; Multiple-input multiple-output (MIMO)
International Standard Book Number (ISBN)
Article - Conference proceedings
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