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Wireless body area network (WBAN) has drawn more and more interests in recent years. As one alternative communication scheme for WBAN, human body communication (HBC) uses human body as the communication medium and it provides better performance for communication security, spectrum efficiency, power consumption, and electromagnetic compatibility. The aims of this paper are to measure and characterize...
The normalized projection misalignment (NPM), which is a measure of blind system identification (BSI), is studied in the context of multichannel speech dereverberation. The NPM errors are convolved with the multichannel equalization filters, and the angle between vectors obtained from channel-wise NPM errors convolving with equalization filters is computed. The mean squared error (MSE), which is a...
As one important part of Internet of Things (IoT), wireless body area networks (WBANs) get rapid development in recent years. The majority of current WBAN researchers focus on the radio frequency (RF) solutions. However, there are still some intrinsic defects in the RF-based WBANs. Recently, human body communication (HBC) has been proposed in which the body itself is used as the propagation medium...
In this paper, we analyze the ergodic achievable rate of a large uplink multiuser multiple-input–multiple-output (MU-MIMO) system over generalized-$K$ fading channels. In the considered scenario, multiple users transmit their information to a base station equipped with a very large number of antennas. Since the effect of fast fading asymptotically disappears in massive MIMO systems, large-scale fading...
A frequency-selecting approach is proposed for robust multichannel dereverberation in the presence of system identification errors (SIEs), based on subband equalization of acoustic channels. Same as the full-band counterpart, performance of the subband multichannel equalizer (SB-MCEQ) degrades in the presence of SIEs. Firstly performance of the SB-MCEQ in different subbands is investigated. Statistical...
In order to realize the content-based image retrieval (CBIR), some characteristics of the images should be extracted like color, texture and shape. The extremely important thing in CBIR is to search the most similar database images to match the query image, which needs to improve the precision. This paper proposes an Improving Precision Priority (IPP) algorithm integrating vital features and the query...
Due to limited energy of Wireless Sensor Networks (WSNs), routing plays a crucial role in improving energy efficiency. The low-energy adaptive clustering hierarchy (LEACH) protocol is a classical solution to cut down energy cost, but it neglects residual energy of sensor nodes and long-range communication which causes low network coverage and high energy consumption. To avoid these shortcomings, we...
Broadcast nature of wireless channels makes wireless network much vulnerable to jamming attacks that may simply destroy the whole network by blocking all useful services. One of the most distinguishing characteristics of distributed wireless access networks is that it is difficult to have perfect information regarding to jammers. In this paper, we exploit game theory to analyze the jamming attacks...
The advantages of deploying mobile sinks (MSs) in wireless sensor networks (WSNs) have attracted tremendous attention recently, because mobility of a sink provides an efficient method to improve data gathering performance in WSNs. However, in such kind of WSN, the efficiency of data dissemination is obviously affected by the trajectory of the MS. Therefore, optimal moving schemes of the MS have been...
Interphone plays a very important role in safety guard system. However its limited communication range restricts its application. As a real-time embedded operation system developed by Wind River, VxWorks is widely used in communication equipments, spacecrafts, weapon platforms, etc. Based on VxWorks, using Ethernet to interconnect the distributed interphones is a novel and promising solution. In this...
The general purpose interface bus (GPIB) designed initially by Hewlett-Packard is the first standard communication protocol between instruments and computers, and is recognized as an IEEE standard. This paper introduces the general architecture using GPIB to integrate several functionally different instruments as an automated test system (ATS). After that, based on a practical case, a design of the...
The safety of grain storage is a significant thing that concerns people's living quality and national economic development. It is exceedingly important for manager to timely master the grain storage condition. Improving the automation level of monitor system is the key to assure the safety of grain storage. A novel scheme of monitor system designed for grain depots is proposed based on wireless sensor...
As complement of protocol conformance testing, protocol interoperability testing is often used to check whether two or more protocol implementations can interact with each other to perform a certain task. Interoperability test sequence generation is an important issue in this field. During interoperability testing, a minimal number of test sequences are expected to reduce the size of system state...
In watermarking system designing, there are always encounter two conflicting objectives: robustness and invisibility. It is difficult to satisfy them at same time. Traditional watermarking algorithm often solve this problem by choosing parameters via experience, it always be inefficient. We resolve the problem by using genetic algorithm (GA) to obtain the optimized solution. With a proper fitness...
In watermarking system designing, there are always encounter two conflicting objectives: robustness and invisibility. It is difficult to satisfy them at same time. Traditional watermarking algorithm often solve this problem by choosing parameters via experience, it always be inefficient. We resolve the problem by using genetic algorithm (GA) to obtain the optimized solution. With a proper fitness...
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