We consider the threshold optimization problem of cooperative spectrum sensing for cognitive radio (CR) and investigate algorithm both single‐channel multichannel sensing. In order to obtain optimal sensing, we deploy fusion rules AND Logic, OR K‐OUT‐N Logic. Moreover, an iterative is proposed CRs in their thresholds. two methods—namely nonrestrained (NRMTO) restrained (RMTO)—have been decrease total error detection probability all subchannels. The simulation results show that outperforms...

SUMMARY To decrease the interference to primary user (PU) and improve detected performance of cognitive radio (CR), a single‐band sensing scheme wherein CR periodically senses PU by cooperative spectrum is proposed in this paper. In scheme, first then transmits during each period, after presence detected, has vacate search another idle channel. The joint optimization algorithm based on double optimize periodical scheme. maximal throughput minimal time can be respectively obtained through...

The performance of cooperative spectrum sensing in cognitive radio (CR) networks depends on the mode, time and number users. In order to improve reduce interference primary user (PU), a periodic model based weight fusion is proposed this paper. Moreover, period, searching are optimized, respectively. Firstly period optimized utilization interference, then joint optimization algorithm local users, obtain optimal for improving throughput (CRU) during each finally water-filling principle...

Based on the analysis of feature cognitive radio (CR) networks, we build a relevant interference model. Cognitive users should particularly consider problem with licensed and satisfy signal-to-interference-plus-noise ratio (SINR) requirement at same time. We propose new iterative algorithm using game theory in this paper. not only SINR as other algorithms but also influence power threshold. The variable limit is characteristic CR. prove convergence existence Nash equilibrium. According to...

Cognitive radio (CR) has achieved increasing attention to improve the spectrum utilisation by allowing coexistence of primary users (PUs) and cognitive (CUs) in same frequency band. As interest is licenced network, power control must be carried out within CR system so that no excessive interference caused PUs. In this study, problem investigated systems based on game theory subject constraint at PU signal‐to‐interference‐plus‐noise ratio (SINR) each CU. The objective reduce consumption some...

Image based indoor localization is an important problem with many useful application. This paper proposes system for performing fine and less latency more priori information, including tile angel the relative height between camera optical center origin in reference coordinate (RCS). The divided into two stages: offline stage online stage. SURF(Speed-Up Robust Features) technique learning line method are performed by establishing image database stage, which makes preparation next In position...

This paper considers network capacity and user coverage improvement in Internet of Things (IoT)-oriented massive MIMO systems. In the literature, grouping approaches have been used to improve capacity, where users are generally divided into non-overlapping groups, those with less favorable channel conditions dropped for optimization. As a result, may suffer from unpredicted interruptions delays, even long time disconnection network. Moreover, also leads unnecessary resource waste. an effort...

RGB-D sensors capture RGB images and depth simultaneously, which makes it possible to acquire the information at pixel level. This paper focuses on use of construct a visual map is an extended dense 3D containing essential elements for image-based localization, such as poses database camera, features, structures building. Taking advantage matched features corresponding values, novel local optimization algorithm proposed achieve point cloud registration camera pose estimation. Next,...

Visual-based indoor localization have become a favored research area in recent years. It can be used inside building where GPS signals are often not available. And due to its low deployment cost, visual-based has been implemented the complicated environment. However, order increase accuracy of localization, scale image database should as large possible. The process that for is laborious. Thus, we propose fast visual map method which takes fully use convenience video stream. Compared with...

To improve the spectrum efficiency, this paper considers multiuser detection with MU-MIMO technology for MIMO-OFDM system uplink same subcarrier shared by multiple users. A low complexity algorithm recursively successive zero-forcing and interference cancellation (RSZF-SIC) based on nullspace is proposed. The RSZF process block diagonalization (BD) technique eliminates co-channel (CCI) a recursive method orthogonal theorem. SIC detects user signals respectively reasonable sequence results of...

Visual localization is employed for indoor navigation and embedded in various applications, such as augmented reality mixed reality. Image retrieval geometrical measurement are the primary steps visual localization, key to improving efficiency reduce time consumption of image retrieval. Therefore, a hierarchical clustering-based image-retrieval method proposed hierarchically organize an off-line database, resulting control within reasonable range. The database organized by two stages:...

Through-wall imaging is one of the applications Ultra Wideband communication that attracts recent interests for its ability to penetrate wall. However, available references fail provide a clear feasible method. This paper proposes novel virtual elliptic curve method based on UWB pulse system, which presents detail process and results. The key factor this correctly obtain propagation delay by correlator, it achieved spread gain pseudo-noise sequences. results show proposed has very high...

ABSTRACT In cognitive radio (CR), the single‐threshold cooperative detection is sensitive to noise power. this paper, a double‐threshold scheme based on weighed combination proposed improve global detected performance of detection. The double thresholds that are decided by restriction probability adopted divide energy statistics observed CRs into three subareas, and locating in confusion area fortified through data fusion coordinator. other two areas can make local binary decisions because...

This paper considers physical layer interference management and network capacity improvement in Internet of Things (IoT)-oriented cognitive MIMO-OFDM systems, where the IoT devices access to licensed spectrum by radio underlay. Aiming fully eliminate primary user as well ensuring optimal QoS for all devices, this paper, we propose a leakage-based precoding scheme with dimensionality reduction SLNR criterion. More specifically, first introduce new channel estimation method using multi-channel...

With the broadband wireless professional communications stepping into its start-up period, a project called trunking (BWT) was launched in China. The purpose of BWT is to support research, development, standardization, and applicable evaluation for communications, with major applications focused on future public protection disaster relief (PPDR). In this article, features, performance requirements, technical challenges PPDR are discussed. To meet these special system architecture uniform...

Cognitive radio is based on the thought of adaptive frequency allocation. It solves problems spectrum lack and inefficiency in current communication networks. In this paper we propose a solution using Artificial Neural Networks (ANNs) to replace complicated allocation system cognitive radio. The will make sure that working well an easier with less waste resource. We present analysis multi-user different weights single user time. Simulation result which fits theoretical given paper.

Through-wall imaging is one of the applications Ultra Wideband communication that attracts recent interests for its ability to penetrate wall. However, available references fail provide a clear feasible method. This paper proposes novel virtual elliptic curve method based on UWB pulse system, which presents detail process and results. The key factor this correctly obtain propagation delay by correlator, it achieved spread gain pseudo-noise sequences. results show proposed has very high...

Cognitive radios (CRs) have a potential to improve spectrum utilization by enabling users access the dynamically without disturbing licensed primary (PUs). In this paper, we consider allocation in wireless networks with multiple selfish secondary (SUs) and pool formed underutilized of users. A novel mechanism is proposed obtain overall utility both users, which graph coloring bidding theory play an important role. Moreover, traditional mechanisms such as distributed random greedy algorithms...

Cognitive radio can significantly improve the spectrum efficiency, and handoff is considered as an important functionality to guarantee quality of service (QoS) primary users (PUs) continuity data transmission secondary (SUs). In this paper, we propose analytical framework based on a preemptive repeat identical (PRI) M/G/1 queuing network model characterize behaviors with general time distribution both connections, multiple interruptions delay resulting from appearance connections. Then,...

For vision-based localization methods, the efficient and accurate image retrieval in a database with large number of images is an important prerequisite guarantee. The traditional content-based method can retrieve that have similar details features query image. However, there may be significant differences semantics between them, which result mismatches. based on convolutional neural network avoid such problems to certain extent. In this paper, we propose end-to-end weakly supervised...

Spectrum aggregation (SA) is known as a technology permitting primary user (PU) or secondary (SU) to occupy several idle bands simultaneously for transmitting numerous data. In LTE-A scenario, users can apply SA media broadcasting network video by utilizing scatted spectrum fragments. However, it's still problem that how the number of handoff and delay be reduced so accomplish similar performance dynamically once dominates in cognitive radio system. This paper proposes strategy based on...