Dual antenna selection in secure cognitive radio networks

This paper investigates data transmission and physical layer secrecy in cognitive radio network. We propose to apply full duplex transmission and dual antenna selection at secondary destination node. With the full duplex transmission, the secondary destination node can simultaneously apply the receiving and jamming antenna selection to improve the secondary data transmission and primary secrecy performance respectively. This describes an attractive scheme in practice: unlike that in most existing approaches, the secrecy performance improvement in the CR network is no longer at the price of the data transmission loss. The outage probabilities for both the data transmission and physical layer secrecy are analyzed. Numerical simulations are also included to verify the performance of the proposed scheme

Dual Antenna Selection in Self-Backhauling Multiple Small Cell Networks

This letter investigates self-backhauling with dual antenna selection at multiple small cell base stations. Both half-duplex (HD) and full-duplex (FD) transmissions at the small cell base station are considered. Depending on instantaneous channel conditions, the FD transmission can have higher throughput than the HD transmission, but it is not always the case. Closed-form expressions of the average throughput are obtained and validated by the simulation results. In all cases, the dual receive and transmit antenna selection significantly improves backhaul and data transmission, making it an attractive solution in practical systems

Physical Layer Network Security in the Full-Duplex Relay System

This paper investigates the secrecy performance of full-duplex relay (FDR) networks. The resulting analysis shows that FDR networks have better secrecy performance than half duplex relay networks, if the self-interference can be well suppressed. We also propose a full duplex jamming relay network, in which the relay node transmits jamming signals while receiving the data from the source. While the full duplex jamming scheme has the same data rate as the half duplex scheme, the secrecy performance can be significantly improved, making it an attractive scheme when the network secrecy is a primary concern. A mathematic model is developed to analyze secrecy outage probabilities for the half duplex, the full duplex and full duplex jamming schemes, and the simulation results are also presented to verify the analysis

Dual Antenna Selection in Secure Cognitive Radio Networks

This paper investigates data transmission and physical-layer secrecy in cognitive radio (CR) networks. We propose to apply full-duplex transmission and dual antenna selection at a secondary destination node. With the full-duplex transmission, the secondary destination node can simultaneously apply the receiving and jamming antenna selection to improve the secondary data transmission and primary secrecy performance, respectively. This describes an attractive scheme in practice: Unlike that in most existing approaches, the secrecy performance improvement in the CR network is no longer at the price of the data transmission loss. The outage probabilities for both the data transmission and physical-layer secrecy are analyzed. Numerical simulations are also included to verify the performance of the proposed scheme

Iterative Frequency Domain Equalization for MIMO-GFDM Systems

This paper proposes a new iterative frequency domain equalization (FDE) algorithm for multiple-input multiple-output (MIMO)-frequency division multiplexing (GFDM) systems. This new FDE scheme is capable of enhancing the system fidelity by considering the complete frequency-domain second order description of the received signal. In addition, a new nulling filter design is also proposed for MIMO-GFDM systems to remove the residual interference, which further improves the system fidelity compared with the traditional scheme. Simulation results are presented to verify the effiectiveness and efficiency of the proposed FDE algorithm

Full-Duplex Wireless-Powered Relay in Two Way Cooperative Networks

This paper investigates a full duplex wireless-powered two way communication networks, where two hybrid access points (HAPs) and a number of amplify and forward relays both operate in full duplex scenario. We use time switching (TS) and static power splitting (SPS) schemes with two way full duplex wireless-powered networks as a benchmark. Then, the new time division duplexing static power splitting (TDD SPS) and the full duplex static power splitting (FDSPS) schemes as well as a simple relay selection strategy are proposed to improve the system performance. For TS, SPS, and FDSPS, the best relay harvests energy using the received RF signal from HAPs and uses harvested energy to transmit signal to each HAP at the same frequency and time, therefore only partial self-interference (SI) cancellation needs to be considered in the FDSPS case. For the proposed TDD SPS, the best relay harvests the energy from the HAP and its self-interference. Then, we derive closed-form expressions for the throughput and outage probability for delay limited transmissions over Rayleigh fading channels. Simulation results are presented to evaluate the effectiveness of the proposed scheme with different system key parameters, such as time allocation, power splitting ratio, and residual SI

Supplemental Table 1. Lipid levels and the prevalence of specific abnormal lipid profiles by BMI categories

For BMI categories, compared with non-<a></a><a>overweight youth</a>, youth with overweight (including obesity) had a higher TC, TG and LDL, lower HDL levels, and higher prevalence of each specific abnormal lipid (<i>P </i>< 0.01)

Supplemental Table 4. Estimated increments in each lipid levels (z-score) per 1 standard deviation of BMI, FMI, and FMP in boys and girls by age group

The associations of BMI, and FMI with TC and LDL-C were stronger in the older (boys ≥ 11 y, girls ≥ 10 y) than in the younger age group (boys < 11 y, girls < 10 y) (<i>P</i> for interaction<i> </i>< 0.05). The differences between increments per 1 SD of FMI and BMI for lipid profiles (except for HDL-C) in older boys were greater than in younger boys

Supplemental Table 2. Lipid levels and the prevalence of specific abnormal lipid profiles by FMI and FMP categories

<a>For FMI or FMP categories,</a> significant differences of lipid profiles were also observed between youth with and without excess fat (<i>P </i>< 0.01)

Supplemental Figure 1. Association of age with median of body mass index, fat mass index and fat mass percentage by sex in Chinese children and adolescents aged 6 - 18y

<p>Blue lines denote boys, red lines denote girls. Body mass index by sex present in left vertical axis (A, B, dotted lines), fat mass index (A, solid lines) and fat mass percentage (B, solid lines) by sex present in right vertical axis. BMI, body mass index; FMI, fat mass index; FMP, fat mass percentage.</p><p> BMI increased with age for both genders. FMI constantly increased during 6-18 y for girls, while increased until about 11 y and decreased after that for boys. FMP did not change dramatically before 10-11 y for both genders, after that, FMP increased for girls but decreased for boys.</p