Abstract
In this paper, a low-complexity detection scheme is proposed for an underdetermined multiple-input-multiple-output (UD-MIMO) wireless communication system that employs N transmit antennas and M < N receive antennas. The proposed scheme combines a simplified parallel interference cancelation (S-PIC) with the block decision feedback equalization (BDFE) algorithm. To account for the extra (N - M)-dimension in the transmitted signal, the UD-MIMO system is partitioned into two subsystems: one with (N - M) transmit antennas and the other one with M transmit antennas. The interference from the first subsystem to the second one is canceled in parallel, and BDFE is performed over the second subsystem. Unlike conventional PIC methods that exhaustively search all the Q (N - M) sequences in the first subsystem, with Q being the constellation size, the proposed scheme explores only a small number of candidate sequences in the first subsystem; thus, it achieves significant complexity reduction. Two new candidate sequence selection methods are proposed. In the first iteration, the candidate sequences used for PIC are selected by exploring the statistical properties of the received signals. In the second iteration and beyond, the set containing the candidate sequences is constructed by utilizing the soft information generated from the previous iteration. The proposed scheme provides a balanced tradeoff between computational complexity and bit error rate (BER) performance.
Recommended Citation
C. Qian et al., "Simplified Parallel Interference Cancelation for Underdetermined MIMO Systems," IEEE Transactions on Vehicular Technology, vol. 63, no. 7, pp. 3196 - 3208, article no. 6704288, Institute of Electrical and Electronics Engineers, Sep 2014.
The definitive version is available at https://doi.org/10.1109/TVT.2014.2298232
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
Block decision feedback equalization (BDFE); parallel interference cancelation (PIC); turbo detection; underdetermined multiple-input multiple-output (UD-MIMO); wireless communication
International Standard Serial Number (ISSN)
0018-9545
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Sep 2014
