1. Secure Transmission With Large Numbers of Antennas and Finite Alphabet Inputs.
- Author
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Wu, Yongpeng, Wang, Jun-Bo, Wang, Jue, Schober, Robert, and Xiao, Chengshan
- Subjects
DATA transmission systems ,SINGULAR value decomposition ,SIGNAL-to-noise ratio ,MIMO systems ,GAUSSIAN channels ,ANTENNAS (Electronics) - Abstract
In this paper, we investigate secure transmission over the large-scale multiple-antenna wiretap channel with finite alphabet inputs. First, we investigate the case where instantaneous channel state information (CSI) of the eavesdropper is known at the transmitter. We show analytically that a generalized singular value decomposition (GSVD)-based design, which is optimal for Gaussian inputs, may exhibit a severe performance loss for finite alphabet inputs in the high signal-to-noise ratio regime. In light of this, we propose a novel Per-Group-GSVD (PG-GSVD) design, which can effectively compensate the performance loss caused by the GSVD design. More importantly, the computational complexity of the PG-GSVD design is by orders of magnitude lower than that of the existing design for finite alphabet inputs while the resulting performance loss is minimal. Then, we extend the PG-GSVD design to the case where only statistical CSI of the eavesdropper is available at the transmitter. Numerical results indicate that the proposed PG-GSVD design can be efficiently implemented in large-scale multiple-antenna systems and achieves significant performance gains compared with the GSVD design. [ABSTRACT FROM PUBLISHER]
- Published
- 2017
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