A practical uncoordinated cooperative jamming (UCJ) scheme is proposed in this paper to enhance the physical layer security of single-input-single-output (SISO) wiretap channel. Differing from existing works, all helpers UCJ are single-antenna uplink users, and each helper transmits a signal independently confound eavesdropper. The intended receiver plays role base station cellular systems as well control center properly allocate power maximize secrecy rate. Two cases addressed solving rate...

This paper studies the design of artificial-noise-aided (AN-aided) secure transmission in slow-fading multiple-input–single-output (MISO) channels. We consider scenario where a multiantenna transmitter sends messages to single-antenna legitimate receiver presence multiple noncolluding eavesdroppers. It is assumed that possesses instantaneous channel state information (CSI) but only statistics eavesdropper's Instead adopting well-known adaptive and nonadaptive schemes, we newly proposed...

This paper studies the artificial noise (AN) aided beamforming design in multiple-input, single-output, and multiple-eavesdropper wiretap channel from perspective of secrecy outage. Unlike many existing works, which directly adopted traditional null-space AN scheme, we start with a general assumption on structure transmit signal, seek to find optimal by solving outage probability (SOP) constrained rate maximization problem. By generalizing several conclusions regarding single-antenna...

In this letter, a novel metric is proposed to evaluate the average sensing energy-efficiency of cognitive radio (CR) networks. A theorem as well related closed-form expression for determining optimum number cooperative terminals provided optimize metric. According theorem, we propose an efficient terminal-assignment strategy coordinated spectrum sensing. Simulation results show that can significantly improve overall energy efficiency CR system.

This paper investigates the physical layer security in a multiple-input-single-output multicast channel, where common message is transmitted to multiple receivers and only statistical channel state information of eavesdropper available. We consider transmitting some artificial noise (AN) along with information-bearing signal improve secrecy. To find optimal AN design, we formulate secrecy outage probability (SOP) constrained rate maximization problem. For solving this problem, adopt novel...

This paper investigates the slow fading single-antenna wiretap channel with imperfect state information (CSI) and studies an on-off transmission scheme fixed communication rate, secrecy transmit power for maximizing throughput under constraints of outage probability (SOP) reliability (ROP). We first solve this problem in a special case without ROP constraint which optimal is obtained SOP constraint. The result gives us upper bound CSI. With help case, general studied. In transformed into...

The traditional centralized baseband processing architecture is faced with the bottlenecks of high computation complexity and excessive fronthaul communication, especially when number antennas at base station (BS) large. To cope these two challenges, decentralized (DBP) has been proposed, where BS are partitioned into multiple clusters each connected to a local unit (BBU). In this paper, we interested in low-complexity distributed channel estimation (CE) method under such DBP architecture,...

This paper studies the secure transmission in a multiuser broadcast channel where only statistical state information of eavesdropper is available. We propose to apply secret dirty-paper coding (S-DPC) this scenario support one user and normal (unclassified) other users. By adopting S-DPC encoding message first place, all information-bearing signals are treated as noise by potential eavesdroppers thus provide secrecy for transmission. In way, proposed approach exploits intrinsic broadcasting...

Roots can effectively consolidate and support the soil are affected by external forces. To identify survival strategies reinforcement capability of roots against damaging forces, we investigated Hippophae rhamnoides taproots with a diameter 1-4 mm in coal mining subsidence area. simulate root damage from erosion, an HG100 digital push&pull tester self-developed experimental installation were used situ. Relative growth rate, activity, tensile force, strength inhibited damage. Significant...

This paper presents a passive UHF RFID tag with dynamic-Vth-cancellation (DVC) rectifier. In the rectifier, threshold voltages of MOSFETs are cancelled by applying gate bias voltages, which dynamically changed according to states MOSFETs. The DVC rectifier enables both low ON-resistance and small reverse leakage MOSFETs, resulting in high power conversion efficiency (PCE). An area-efficient demodulator novel average detector is also designed, takes advantage rectifier's first stage as...

Global technologies of data transmission in real time are developing constantly. Therefore, modelling messages through satellite constellations is an actual problem. In this paper the original model a communication channel ‘Vehicle-to-Satellite-to-Ground Station’ based on principles IEEE 802.11a standard designed using MatLab Sіmulіnk software. The allows simulating with rate from 6 to 54 Mbit/s adaptive modulation. Two types channels were analysed for uplink/downlink modulation – free space...

As FPGAs integrate into high-speed systems, performance and signal integrity become more important in I/O design. This paper describes the development of an FPGA design to support 1.6 Gb/s differential source-synchronous standards 300 MHz external memory interfaces. Speed were achieved using circuits such as level-shifters with voltage temperature compensated current sources, on-chip decoupling capacitors, floating-well output buffers. Programmable drive strength, impedance matching,...

This paper presents an improved latched comparator which is suitable for high speed folding and interpolation ADC. The proposed minimizes the kick back noise. Dummy transistors are introduced in switch circuit to suppress clock feedthrough. Transistors common-gate arrangement inserted reduce Simulated result of a 0.18 um standard CMOS technology shows that, this achieves low offset 4 mV, reduces noise 0.5 exhibits power dissipation 193 uW at 3.3 V supply very operation 250 MHz.

The use of orthogonal frequency division multiplexing (OFDM) technology enables an optical transmission system to break the limitation wavelength grids due legacy multiplexing. This constructs a flexible and elastic paradigm so as achieve high spectrum efficiency flexibility fiber resource usage. paper introduces novel adaptive strategy in coherent OFDM systems, aiming optimize operation terms energy consumptions for demand with required data rate. By jointly considering nonlinear effects...

Wireline transceivers for high-speed data transmission through backplane and ethernet cables are important applications microelectronic nanoelectronic CMOS technologies. Although many circuit simulators provide correct system-level transistor-level simulations, they usually fail to give results highly lossy or/and dispersive channels. This paper discusses the advanced simulator that we developed. It can simulation those also process channel model files allow commercial results. when used...

Infrared communication is the main mode of short distance and has been widely used for point to data transmission. The drawback infrared that signal very weak there are certain requirements firing angle. According these disadvantages, this design transmitter circuit three stage amplifiers in order amplify initialization audio drive emission heads work normally, also two ensure sufficient strength transmitted signal. Optical receiver employs a amplifying some filter circuits receiving can be...

In this paper, a novel MAC-layer spectrum sensing scheme base on continuous-time semi-Markov process is investigated for the purpose of improving efficiency cognitive radio (CR) systems. The focuses identification optimal sequence channel by modeling group licensed channels' usage pattern as process. Experimental results show that proposed algorithm has potential to achieve noticeably improved performance in terms reduction overhead and second user's average throughput when compared...

As FPGAs become more integrated into high-speed systems, high performance I/O with excellent signal integrity becomes important. This paper describes how these challenges were met on an FPGA developed to support 1.6 Gbps differential source-synchronous standards and 300 MHz external memory interfaces. The buffer features programmable drive strength, output impedance matching, hot-socketing compliance, 3.3v tolerance. High-speed was achieved using design techniques of level-shifters voltage...

Described are the possibilities for increasing accuracy in determining location of unmanned aircraft. Compared capabilities different coordinate systems to increased 2.5 cm. The methods transmitting correlation data described. In conclusion, it is assumed that accurate determination coordinates mobile objects most appropriate use transmission Real Time Kinematics corrections by network a operator.

Для дослідження передачі ADS-B повідомлень по радіочастотному супутниковому каналу зв’язку звикористанням програмного комплексу MATLAB Sіmulіnk побудовано оригінальну модель зв'язку«Літак-Супутник-Наземна станція», яка включає передавач повітряного судна, каналів данихнагору/униз, супутникового ретранслятора, приймача наземної станції. Проаналізовано залежності коефіцієнтадвійкових помилок від втрат у вільному просторі, шумових температур і підсилення супутниковоготранспондера для різних...

Conventional neuromorphic accelerators primarily leverage split-merge method to accommodate a neural network that is beyond single core's size, leading possible accuracy loss, extra core usage and significant power energy overhead. This work presents an energy-efficient, reconfigurable neuro-morphic processor address the problem by (i) partial sum router circuitry enables in-network computing remove need of merge cores; (ii) software-defined Networks-on-Chip eliminates power-hungry routing...

An SRAM based embedded array programmable logic architecture with densities ranging from 10000 to 100000 gates is discussed in this paper. incorporated into implement megafunctions like microprocessors, FIFOs and multipliers efficiently. A multidimensional interconnect scheme featured achieve flexible routing between blocks, the I/O pins. The first member of family currently available a gate density 50000 gates.

This paper presents detailed analysis of edge based NRZ equalizer proposed in IEEE 802.3ap Task Force. Paradox on spectrum zero at Nyquist frequency is explained. Design methods are improved. Optimization proposed. Results 10-Gb/s transmission through 2 practical backplanes verify the analysis, design, and optimization methods.