Interference-Aided Detection of Subthreshold Signal Using Beam Control in Polarization Diversity Reception

• Published in: IEEE communications letters Vol. 22; no. 9; pp. 1926 - 1929
• Main Authors: Hiraoka, Shintaro, Nakashima, Yasuo, Yamazato, Takaya, Arai, Shintaro, Tadokoro, Yukihiro, Tanaka, Hiroya
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2018; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Antenna arrays; Binary data; Channel capacity; Cochannel interference; Data transmission; Diversity reception; Dual polarization (waves); Interference; Mathematical models; Polarization; Polarization diversity; Probability density function; Radio receivers; Receivers; Sensitivity; Source code; stochastic resonance; subthreshold; weak signal detection
• ISSN: 1089-7798; 1558-2558
• DOI: 10.1109/LCOMM.2018.2851583

The present letter discusses a detectability enhancement induced by co-channel interference signals in the polarization diversity reception. The challenge is the detection of weak (subthreshold) signals, the level of which is less than the detection limit of radio receivers. To understand the theory underlying the mechanism in the presented diversity scheme, we introduce an analytic model of a dual polarized antenna array in the fading channel. In addition, the channel capacity in a binary data transmission is derived. As a result, we reveal that the interference-aided diversity reception enables us to detect signals even below the detection limit of the receiver. Moreover, the appropriate source code is needed to achieve the channel capacity because the transmission channel is asymmetric in the present reception scheme.