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

Shintaro Hiraoka, Yasuo Nakashima, Takaya Yamazato, Shintaro Arai, Yukihiro Tadokoro, and Hiroya Tanaka

Polarization diversity, subthreshold, weak signal detection, channel capacity, stochastic resonance
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.

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

IEEE Communications Letters

22

9

1926

1929