Internet of Things (IoT) is becoming an emerging paradigm to achieve ubiquitous connectivity, via massive deployment physical objects, such as sensors, controllers, and actuators. However, concerns on the IoT security are raised due wireless broadcasting nature energy constraint objects. In this paper, we study secure downlink transmission from a controller actuator, with help cooperative jammer fight against multiple passive noncolluding eavesdroppers. addition artificial noise aided...

This paper presents a multi‐time channel prediction system based on backpropagation (BP) neural network with multi‐hidden layers, which can predict information effectively and benefit for massive MIMO performance, power control, artificial noise physical layer security scheme design. Meanwhile, an early stopping strategy to avoid the overfitting of BP is introduced. By comparing predicted normalized mean square error (NMSE), simulation results show that performances proposed are extremely...

In this article we focus on the security in cognitive radio, which is one of needs for new technologies requiring spectrum bands. The PHY-layer CR more complex than a conventional wireless communication system because sensing and dynamic access mechanism. Therefore, it becomes vulnerable to be invaded. We present approaches defense against threats networks. analyze validities benefits proposed approaches, can valid not only attacks but also those upper layer.

By utilizing the radio channel information to detect spoofing attacks, based physical layer (PHY‐layer) enhanced authentication can be exploited in light‐weight securing 5G wireless communications. One major obstacle application of PHY‐layer is its detection rate. In this paper, a novel method developed attacks without special test threshold while trained model used determine whether user legal or illegal. Unlike method, proposed AdaBoost algorithm increases rate with one‐dimensional...

Optical networks can support a large amount of IP traffic in the next generation with energy efficiency awareness. However, ever increasing demand also renders tremendous consumption networks. The traditional separate design for wireline and wireless cannot meet systems well. Fortunately, SDN provides effective leverage to transform such into wireline-wireless cross-network design. In this article, through employing software defined cross-networks, wired routing transmission be controlled an...

An asymmetric zero correlation zone (A-ZCZ) sequence set is a type of ZCZ and consists multiple subsets. It the most important property that cross-correlation function between arbitrary sequences belonging to different subsets has quite large zero-cross-correlation (ZCCZ). Our proposed A-ZCZ sets can be constructed based on interleaved technique orthogonality-preserving transformation by any perfect length P=Nq(2k+1) Hadamard matrices order T≥2, where N≥1, q≥1 k≥1. If q=1, novel optimal set,...

In this paper we apply PolInSAR decomposition techniques to compact-pol SAR Interferometry. The complex cross-correlation matrix of single-baseline polarimetric Interferometry is decomposed into three 2 × scattering matrices corresponding surface scattering, double and random volume scattering. A numerical method applied solve the system nonlinear equations involved in procedure. According above procedure, power contribution vertical displacement may be obtained for each mechanisms, from...

When mobiles cannot support multiple antennas due to size or other constraints, cooperative diversity is an efficient way provide uplink transmit diversity. This paper presents a novel coding scheme in use of rate-compatible parallel concatenated LDPC codes. We evaluate its performance terms bit error rate. Simulation results show our provides significant gains for variety channel conditions. By allowing different code rates and partitions, coded cooperation great degree flexibility adapt conditions

In this paper, the CSAR (circular synthetic aperture radar) technique is introduced firstly. The principle of 3D (three dimensional) imaging and spatial wavenumber support are analyzed resolution discussed secondly. Secondly, Ku band fully-polarimetric human body experiments performed, experimental data processed by a fast backprojection algorithm, corresponding amplitude images shown. Finally, future for discussed.

Arc array synthetic aperture radar (SAR) is a novel imaging system for wide-area observation, with wide observation range and high resolution. uses W-band as carrier signal, wavelength short. The small high-frequency vibration of the helicopter-borne platform will cause significant changes in phase echo which seriously deteriorate performance arc radar. Based on order approximate algorithm radar, this paper proposes error compensation based Short-time Fourier transform (STFT) parameter...

We consider differentiated time-critical task scheduling in a N×N input queued optical packet switch to ensure 100% throughput and meet different delay requirements among various modules of data center. Existing schemes either slot-by-slot with queue depth serving as the metric or assume that each input-output connection has same bound batch mode. The former scheme neglects effect reconfiguration overhead, which may result crippled system performance, while latter cannot satisfy users'...

A new cross-layer design combining adaptive modulation and coding (AMC) with Hybrid Automatic Repeat Qequest (HARQ) based on rate-compatible LDPC codes is proposed for IEEE Std. 802.11p in DSRC systems. Instead of considering AMC at the physical layer ARQ data link separately, we propose a that combines these two layers judiciously to maximize either spectral efficiency or throughput. With correcting occasional packet errors layer, stringent error control requirement alleviated layer....

3维波数域成像处理方法对回波信号距离历程不做近似,成像重建精度高。机载下视阵列3D SAR跨航向阵列长度相比跨航向幅宽小很多,需将回波信号尺寸补零到成像场景尺寸以防止FFT时出现卷绕,过高的补零倍数给波数域成像处理带来内存需求和运算量的激增。如果能够仅对ROI (Region Of Interest) 而非整个观测场景进行成像处理就能够极大程度降低补零倍数,提高该算法的时效性。该文提出的波数域快速成像方法首先在波传播-航迹向和波传播-跨航向完成两次2维成像处理,结合两次2维成像处理结果确定ROI,最后使用3维波数域算法对ROI进行3维精确重建。实验数据验证了该文算法的有效性。

Two or more sequences are called a set of odd-periodic complementary (OPCS) if the sum their respective autocorrelation function is delta function. In this paper, definition OPCS given. The construction and synthesis methods discussed. relation sets binary with periodic pointed out. We get some new PCS.

The wireless networks lack a physical boundary due to the broadcasting nature of transmissions. security has become critical concern in layer networks. In this paper, we propose novel MIMOaided scheme. By exploiting an extra dimension provided by MIMO systems for adding artificial noise transmission process, which let attacker's signal be degraded version legitimate receiver's signal, physical-layer is enhanced as result. proposed scheme may rely on upper-layer encryption techniques...

In this paper, a construction method to generate binary extended d-form sequences with the same correlation properties as is proposed. Using QF (a special case of sequences), optimal are constructed. Finally, we give an example families sequences, which constructed from Legendre