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The high speed railway wireless communication system is quite different from public wireless communication system, because the service is train control message, which are closely related to the safety of train transportation. Thus it has much higher requirements for the safety and reliability. In this paper, secrecy capacity and outage probability at the high speed railway scenario with traditional...
This paper presents a high-linearity and low-noise down-conversion active mixer at 2.1–2.5 GHz for a receiver with low conversion gain. This proposed circuit has been designed and fabricated with a 0.35 µm SiGe BiCMOS process. The layout size is 0.34 × 0.3 mm2. Through simulation, the designed mixer achieves an input 1dB compress point of +10.8 dBm, an IIP3 of +19.4 dBm, a DSB noise figure of 8 dB...
In this paper we present the status of s feasibility study for a wireless readout of the Silicon inner-tracker for the ATLAS silicon strip detector with use of the 60 GHz band, also known as the Millimeter wave band due to its wavelength of 5 mm.
It has long been accepted that Shannon capacity is the channel transmission capability limit, but this is a misunderstanding. This paper considers the actual communication system bandwidth is limited, and the band limited Gauss noise (BLGN) has correlation, which leads to the actual entropy of BLGN is smaller than its maximum entropy, so the actual channel capacity is always greater than the Shannon...
Passive source location attracts a growing interest due to its usefulness in various applications such as wireless communications, microphone arrays, sensor networks and so on. This paper combines the time differences of arrival (TDOA) and gain ratios of arrival (GROA) techniques to present a novel dual-station source location method of a known altitude object in 3D space. The closed form solution...
A novel approach involving selective channel signaling is proposed to achieve significant reductions in power requirements in OFDM. It is shown that by using only a subset of the available channels, savings in power can be achieved without sacrificing channel capacity.
Power Line Communication (PLC) on aircraft is a potential technology to integrate the power and communication system for decreasing the weight and volume of the cables onboard. However, electromagnetic noise in power line made it a rush environment for data transmission. Especially, the narrowband interference in the frequency domain and the impulsive noise in the time domain are the most harmful...
Existing methods of self-interference cancellation have greatly reduced the strong self-interference signal for the practical design of Full-Duplex (FuDu) wireless systems. However, current FuDu wireless is hard to be put into practice due to the reason that residual self-interference after interference cancellation is still much stronger than the thermal noise. In this paper, a wideband FuDu OFDM...
This paper presents an optical wireless identification (OWID) scheme utilizing high-energy harvesting thinfilm embedded onto the corner cube retroreflector (CCR). We apply optical wireless communication (OWC) for transmitting information. The thinfilm is used as a rechargeable battery that absorbs the power when the incident light beam goes through the CCR and reflects On-Off-Keying (OOK) modulated...
Exploiting the idea of cooperative communications is an efficient way to improve the physical-layer security of a wireless transmission in the presence of passive eavesdroppers. In this paper, we propose a hybrid cooperative relaying and jamming scheme to enhance the security of a two-way relay network, where some intermediate nodes help to relay the signal to the legitimate terminals via distributed...
This paper proposes a cluster-based optimal relay and jammer selection (CB-ORJ) scheme to deal with interception and improve the secrecy rate in wireless multi-hop networks in the presence of both intra-cluster and inter-cluster eavesdroppers. We first present a novel mathematical model of cluster-based secure transmission. Furthermore, we propose an on-demand relay and jammer selection approach based...
In this paper, the sum capacity of the Poisson Z-interference channel that models optical communication systems with multiple transceivers is investigated. First, the capacity region of the Poisson Z-interference channel is shown to remain the same if we approximate the Poisson Z-interference channel with a discrete time memoryless binary input binary output Z-interference channel. Second, building...
Distributed wireless base stations are becoming more prevalent as their physical size shrinks and their computing and control functions substantially increase. Distributed wireless base stations operating at the same or different bands will be installed in close proximity. These devices must have the ability to function as intended in the presence of radio noise that is radiated both intentionally...
Reliable co-channel bidirectional transmission in wireless networks is moving towards reality by employing the emerging full-duplex (FD) technology. Enhanced by FD-capable nodes, a future wireless network can be made up merely with pairs of bidirectional communicating nodes where each pair occupies a block of orthogonal resource to avoid interference, referred to as pure-FD system. In this paper,...
USB 3.0 running at 5 Gbps can radiate and interfere with the wireless communication technologies integrated in mobile computer designs. The interference degrades the wireless performance such as data throughput and results in bad user experience. It is important to define compliance test methods to ensure good designs in both system and component levels. In this paper, a new and simple test fixture...
USB3 devices use 5-Gbps signalling and the data spectrum can generate broadband noise in the 2.4-GHz ISM band. The noise can radiate from the USB3 connectors or cables and cause radio frequency interference (RFI) to a wireless receiver whose antenna is placed near a USB3 device. In this paper the root-cause for the radiation from USB3 receptacle connectors is presented. Simulation and measurement...
Wireless capsule endoscopy (WCE) is a new innovative solution for gastrointestinal disease detection. The image quality of WCE is not satisfactory for medical applications since some of them are dark and low-contrast. The WCE image enhancement is a challenge task, mainly because the diversity of the WCE images of different people and the need to preserve the local fine details of WCE images. Hence,...
For a three-node amplify-and-forward (AF) two-way relay network (TWRN), we investigate the power allocation problem during the channel training process for both terminals to estimate the global channel state information (CSI) of the whole network. This includes the power allocations between different training steps and among different nodes. Two power allocation schemes are proposed: a mean-square-error...
This contribution deals with the detection of programme making and special event applications by spectrum sensing. In particular the effect of site specific positioning of spectrum sensors is discussed and is of interest especially to cognitive systems. The procedure of energy detection of the devices is based on a stochastic fading channel performed by ray tracing analysis within an exhibition hall...
The performance of Johnson and Thermal noises in the Line-Of-Sight (LOS) optical wireless channels has been monitored in a previously implemented application-specific genetic algorithm. The latter achieves sensible selection requirements of link parameters in different weather conditions and link characteristics, and the changes in thermal and Johnson noises are recorded correspondingly. The work...
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