Traditional Wi-Fi indoor localization system based on big data technique suffers from great degradation due to the instability and low space distinguish ability of received signal strength (rSS). replacing rSS with ch...
详细信息
ISBN:
(纸本)9781509028610
Traditional Wi-Fi indoor localization system based on big data technique suffers from great degradation due to the instability and low space distinguish ability of received signal strength (rSS). replacing rSS with channel state information (CSI) is proven to be an efficient method. However, not all CSI raw data contribute equally to the localization performance. The computational cost of fingerprint database is unacceptable as well. In this paper, we propose a novel method of Wi-Fi indoor localization based on CSI. A fast orthogonal search (FOS) algorithm is utilized to calculate the weights of CSI raw data collected from the wireless network interface card (NIC), reducing the database at the same time. different weights of the features are then used as the input of a back-propagation (BP) neural network, conducting weighted training. We implement the system and experimentally evaluate its performance in the typical laboratory scenario. The performance of the proposedsystem is compared with several existing systems. result shows that the proposedsystem has a 13% improvement in accuracy and a 14% improvement in execute time. The average distance error is 1.5702m.
With the integration of cores increasing, on chip network (NoC) latency and throughput get worse in traditional structures. This paper proposed a novel low latency hierarchical mesh-based network-on-chip (PHNoC) struc...
详细信息
With the integration of cores increasing, on chip network (NoC) latency and throughput get worse in traditional structures. This paper proposed a novel low latency hierarchical mesh-based network-on-chip (PHNoC) structure which uses three parameters to describe hierarchical topology for the size changing design, and three types of base clusters to construct multilevel structure. Experimental results demonstrated that the proposed structure had lower latency and higher throughput than traditional 2d mesh and conventional hierarchical NoC in different size systems, and the larger size the better performance it improved.
This paper focuses on the problem of secure transmission in a cellularsystem. A full-duplex base station using artificial noise is adopted to improve both the uplink anddownlink secrecy rate via pairing terminals wh...
详细信息
This paper focuses on the problem of secure transmission in a cellularsystem. A full-duplex base station using artificial noise is adopted to improve both the uplink anddownlink secrecy rate via pairing terminals which reverses the downlink and uplink of each other. We give the designs of artificial noise and the user's desired signal, andderive the pairing prin-ciple between terminals. Moreover, the influence of self-interference cancellation on secrecy rate is ex-plored. Simulation results show that the secrecy rate can get much better performance by adopting full-duplex artificial noise scheme and proposed pair-ing method. The downlink secrecy rate decreases with the distance between terminals. Besides the uplink secrecy rate is sensitive to the ability of self-interference cancellation.
In view of the problem that existing fake comments detection methods did not take full advantage of dynamic information contained in the history of user behavior, in the paper, we firstly mine the dynamic features fro...
详细信息
For the low accuracy of detection and high false-positive rate (FPr) problems in the traditional ddoS attack detection methods, the method based on conditional random fields (CrF) is introduced. The CrF-based model co...
详细信息
How to promote information diffusion models accuracy poses challenges to social networks. We propose information diffusion model based on k-core for social networks (IMK). On the basis of the compactness and centricit...
详细信息
In image recognition field, the fact is that the trained image classifier can not recognize the images, whose class type is not the same as the training data. To resolve this problem, a new image classifier is propose...
详细信息
In this paper, we investigate both the reliable and secure transmission fordevice-to-device (d2d) communications underlaying cellular networks where eavesdroppers are according to the Poisson point process (PPP) dist...
详细信息
ISBN:
(纸本)9781509053773
In this paper, we investigate both the reliable and secure transmission fordevice-to-device (d2d) communications underlaying cellular networks where eavesdroppers are according to the Poisson point process (PPP) distribution. The transmission secrecy outage probability (TSOP) is proposed to comprehensively characterize the joint performance of the reliability and the security. Firstly their connection outage probabilities (COPs) and secrecy outage probabilities (SOPs) are derived in the non-colluding eavesdroppers case. Then, their corresponding TSOPs are presented. We furtherdiscuss the impact of various factors on theirreliable and secure transmission performances, such as the node intensity, the target threshold and the large-scale path loss.
Most communication systems for localization use the measurements based on joint estimation of time-difference of arrival (TdOA) and frequency-difference of arrival (FdOA). In this study, an efficient androbust method...
详细信息
暂无评论