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We study the secrecy outage performance of a dual-hop multiple relay decode-and-forward (DF) cognitive relay network under the interference constraints in this paper, where all relays and the destination are equipped with Κ antennas. All channels we considered in the proposed system experience the Nakagami-m fading, and the selection combining technique is employed at the antennas of all the main...
A multi-pair amplify-and-forward (AF) MIMO system is considered in this paper, in which all source users transmit their information to destination users via a shared relay. With the large N regime, the effect of small-scale fading tends to diminish while the large-scale fading plays a main role in affecting the system performance. The large-scale fading is modeled as generalized-K fading. While the...
In this paper, we investigate the secrecy outage probability in a dual-hop decode-and-forward (DF) secondary cognitive radio network, which is equipped with one source, one destination, multiple eavesdroppers (EAVs) and multirelay. The direct links from the source to the destination and the EAVs are considered because of the moderate shadowing environment. All channels experience the Rayleigh fading...
Level set estimation (LSE) is the process of classifying the region(s) that the values of an unknown function exceed a certain threshold. It has a wide range of applications such as spectrum sensing or environment monitoring. In this paper, we study the the optimal LSE of a linear random field that changes with respect to time. A linear sensor network is used to take discrete samples of the spatially-temporally...
This paper investigates a massive MIMO multi-pair two-way relay system, where K-pair users exchange information within communication pair, with the help of a shared amplify- and-forward (AF) relay station (RS). Large scale antenna array is equipped at the RS and each user has a signal antenna. The RS adopts the zero-forcing reception/zero-forcing transmission (ZFR/ZFT) beamforming. The imperfect channel...
In this paper, we study the physical-layer security of amplify-and-forward relaying networks under a spectrum-sharing mechanism over independent non-identically distributed Rayleigh fading channels. Relay selection is presented to select the best relay, which can guarantee the security performance by minimizing the received signal-to-noise ratio at the eavesdropper. In order to guarantee the quality-of-service...
A multi-pair two-way amplify-and-forward relaying system is considered in this paper, where the $K$-pair users exchange information within pairs, with the help of a shared relay station. Each user is equipped with a single antenna while the relay station is equipped with a very large number of antennas $N$, where $N\gg2K$. The impact of imperfect channel state information (CSI) due to the channel...
In this paper, we propose a novel optical notch filtering scheme, which can be used for optical signal to noise ratio (OSNR) monitoring. OSNR monitoring for 10-Gb/s and 40-Gb/s NRZ-OOK, NRZ-DPSK and Duo-binary signals are demonstrated in VPI transmission maker 7.6. Low bandwidth photo detector adopted in the monitoring scheme would provide immunity to chromatic dispersion (CD) and low cost solution.
In this paper, we propose a simple in-band optical signal to noise ratio (OSNR) monitoring method based on the beat noise RF power measurement. This method splits the incoming optical signal into two branches, and one of the branches is processed by an optical band pass filter. Then, the signals in the two branches are detected by balanced receiver and the beat noise can be calculated. The simulation...
Feature reduction is an effective way to improve the classification performance when machine learning methods are used in gait analysis. In this paper, we proposed a novel hybrid feature reduction method (MSNR&PCA) based on the combination of feature ranking with principle component analysis (PCA). Three feature reduction methods, namely, feature ranking based the value of signal to noise ratio...
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