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With recent breakthroughs in full-duplex radio, there is a growing trend to combine it with cognitive radio. Thus the topic of spectrum sensing in full-duplex scenario is addressed in this paper. Firstly, the concept of full-duplex spectrum sensing and its advantage over traditional half-duplex spectrum sensing are analyzed. Then a correlation based least square algorithm is formulated to cancel out...
An adaptive modulation scheme designed for optical camera communication (OCC) applications was proposed. Compared with conventional modulation schemes such as on off keying (OOK), pulse amplitude modulation (PAM), pulse position modulation (PPM), the proposed scheme can improve data link quality under combined channel impairments such as the ambient light noise from background illuminations. The resulting...
Detection of wideband communication signals is critical for cognitive radio (CR) as it enables secondary users to dynamically access the unoccupied bands. However, accurate and fast spectrum sensing is still a challenge in low signal to noise ratio (SNR) environment. To encounter this problem, a feature detector based on compressed sensing (CS) and wavelet transform (WT) (CS-WT feature detector) is...
Frequency reuse scheme is extremely important in multi-hop relay networks (MRNs), because some extra frequency resource should be elaborately allocated to Relay Stations (RSs). However the time and spatial reuse characteristics of RS should be taken into account in order to mitigate the co-channel interference. This paper presents two adaptive frequency reuse schemes for MRN by using different reuse...
This paper considers detection of a signal corrupted by 2D intersymbol interference (ISI) and additive white Gaussian noise (AWGN). We compute equivalent convolution masks for 4-ary and binary modulation with Gaussian and Sinc square point spread functions (PSFs). To maintain the same spatial density, the binary mask is wider than the corresponding 4-ary mask. Based on the maximum likelihood (ML)...
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