An Improved Precoding Algorithm for LTE-Advanced CoMP System

2013 ◽  
Vol 427-429 ◽  
pp. 2519-2522
Author(s):  
Qiong Wang ◽  
Zhao Xia Zhang ◽  
Jia Liu
Keyword(s):  
Performance Improvement ◽  
Block Diagonalization ◽  
Communication Quality ◽  
Zero Forcing ◽  
Cell Edge ◽  
Lte Advanced ◽  
Simulation Results ◽  
Noise Ratio ◽  
Inter Cell Interference

In LTE-Advanced (LTE-A) system, coordinated multi-point (CoMP) technology can reduce inter-cell interference effectively, and improve the communication quality of the cell edge users. The main purpose of this paper is to optimize the precoding algorithm and enhance the overall cell throughput in LTE-A CoMP downlink. Based on CoMP-JP, we focus on zero-forcing (ZF), block diagonalization (BD) and signal-to-leakage-plus-noise-ratio (SLNR). We propose an improved precoding algorithm (ZF-SLNR) which combines the advantages of ZF and SLNR . Simulation results suggest that ZF-SLNR algorithm provides appreciable performance improvement.

Exploiting Routing Strategy of DTN for Message Forwarding in Information Hiding Applications

2019 ◽  
Vol 11 (2) ◽  
pp. 34-46
Author(s):  
Shuangkui Xia ◽  
Meihua Liu ◽  
Xinchen Zhang ◽  
Hong Sun ◽  
Mao Tian
Keyword(s):  
Information Hiding ◽  
Delivery Ratio ◽  
Mobile Nodes ◽  
Communication Quality ◽  
Routing Strategy ◽  
Long Time ◽  
Simulation Results ◽  
Delay Tolerant ◽  
Intermittently Connected

Delay tolerant networks (DTNs) represent a class of intermittently connected networks. In such networks, messages are hard to track since they are transmitted by opportunistic encounters between mobile nodes. This feature makes DTN an appropriate masking channel for information hiding systems. However, the DTN often has poor communication quality, given that it suffers from frequent disruptions. In order to improve the communication quality of DTN and meet the needs of information hiding system, an efficient routing strategy is proposed in this article. On the other hand, in information hiding systems, a relatively long Time-To-Live (TTL) of messages will increase the risk of the message being exposed. To achieve a balance between delivery ratio and concealment, the sensitivity of message TTL is analyzed and a suitable value of lifetime is given. Finally, the simulation results show that the proposed algorithm can improve the effectiveness of message transmission, and the DTN can be used as masking channel to realize information hiding system.

Relaxed Parallel Scheduling Algorithms Investigation of Support Resource Reservation from Grid

2012 ◽  
Vol 182-183 ◽  
pp. 1849-1853
Author(s):  
Jun Chen ◽  
Bo Li ◽  
Er Fei Wang
Keyword(s):  
Performance Improvement ◽  
Parallel Machine ◽  
Relaxation Mechanism ◽  
Resource Reservation ◽  
Computing Environment ◽  
Parallel Scheduling ◽  
Simulation Results ◽  
Support Resource ◽  
Scheduling Models

In this paper, the grid computing environment resource reservation problem of using the parallel machine, proposed the relaxed time parallel scheduling models and algorithms support resource reservation. The simulation results of FCFS and EASY backfill algorithms in resource utilization, job bounded slowdown factor and the success rate of Advanced Reservation (AR) jobs were studied. Show that the relaxation mechanism, the average waiting time and the average bounded slowdown factor of non-reserved jobs down. EASY backfill algorithm which guarantees AR jobs quality of service at the same time, the better the performance improvement of non-AR jobs.

scholarly journals Iterative Approach for Performance Improvement of PLC Systems

2018 ◽  
Vol 7 (4.4) ◽  
pp. 7
Author(s):  
Yu Min Hwang ◽  
Young Ghyu Sun ◽  
Issac Sim ◽  
Jin Young Kim
Keyword(s):  
Performance Improvement ◽  
System Performance ◽  
High Speed ◽  
Impulsive Noise ◽  
Multipath Fading ◽  
Power Line Communication ◽  
Zero Forcing ◽  
Improve Performance ◽  
Turbo Equalizer ◽  
Simulation Results

In this paper, we propose Turbo equalizer scheme using zero-forcing (ZF) and simulate in power line communication (PLC) systems with high speed. Due to impulsive noise and multipath fading in PLC systems, inter-symbol interference (ISI) happens. We employ Turbo equalizer scheme to get over ISI and improve performance. From simulation results, it is confirmed that the proposed Turbo equalizer can remarkably improve PLC system performance.  

Research on Energy Efficiency Optimization in Heterogeneous Network

2014 ◽  
Vol 687-691 ◽  
pp. 2462-2465
Author(s):  
Hui Bao ◽  
Pan Shi
Keyword(s):  
Energy Efficiency ◽  
Heterogeneous Network ◽  
Optimization Problem ◽  
Beam Forming ◽  
Block Diagonalization ◽  
Mathematical Methods ◽  
Zero Forcing ◽  
Convex Optimization Problem ◽  
Single Antenna ◽  
Inter Cell Interference

The biggest challenge for heterogeneous network is co-channel interference problem, and due to the presence of interference, the system energy efficiency reduced greatly. In previous studies that use of space resources to eliminate interference between heterogeneous networks , most are based on the receiving end with a single antenna case to use zero forcing (ZF) beam-forming algorithm , however in practice the receiving end often configure multiple antennas, so this article use Block Diagonalization (BD) beam-forming algorithm to eliminate inter-cell interference after considering the coordinated multi-point transmission processing technology. This paper defines a energy efficiency metrics and convert it into a convex optimization problem by mathematical methods, and the improved energy efficiency programs is obtained ultimately.

Self-Organizing Network Solutions

2017 ◽  
pp. 241-253
Author(s):  
Mohammadreza Behjati ◽  
John Cosmas
Keyword(s):  
Mobile Network ◽  
Network Capacity ◽  
Relay Nodes ◽  
Network Cooperation ◽  
Network Layers ◽  
Lte Advanced ◽  
Network Quality ◽  
Inter Cell Interference ◽  
Self Organizing

Quality of service (QoS) and network capacity are being insisted as the two dominant factors for the utmost network satisfaction within any mobile network contracts. On the other hand, the heterogeneous network (HetNets), which are constructed based on sub-network layers' cooperation between macrocell and shorter-range applications like micro, femto and relay nodes, are also introduced as an open door to the recent researches towards the desired network satisfaction for the recently upgraded networks like LTE-Advanced (LTE-A). Nevertheless, since any network cooperation is expected to include a number of challenges; this cooperation is not excluded of dealing with degrading effects, such as interference, among the sub-network elements. This chapter presents a detailed discussion in self-organizing network (SON) methodology, as a novel solution to deal with network challenges, e.g. inter-cell interference coordination (ICIC), mobility, power control, etc. to improve the network quality and capacity.

scholarly journals EMPLOYEE PERFORMANCE IMPROVEMENT THROUGH RELIGIOUS VALUES AND QUALITY OF COMMUNICATIONS AS WELL AS PERSONAL INTEGRITY (Case Study in PoLSUSKA Daop 5 Purwokerto)

2017 ◽  
Vol 2 (2) ◽  
pp. 301
Author(s):  
Achmad Zahid
Keyword(s):  
Structural Equation Modeling ◽  
Performance Improvement ◽  
Structural Equation ◽  
Employee Performance ◽  
Equation Modeling ◽  
Religious Values ◽  
Personal Integrity ◽  
Communication Quality

The purpose of this study is to examine a model in which religious values and communication quality predict personal integrity and employee� performance.� A� total� of� 129� respondents fromPolsuska Daop 5 Purwokertocompleted questionnaires. Results from structural equation modeling based smartPLS 3.0 confirmed that religious values and communication quality were positively related to personal integrity and employee performance. Furthermore, the result revealed that personal integrity was positively related to employee performance. Keywords: Religious values, Communication quality, Personalintegrity, Employee performance

scholarly journals Wireless-Powered Cooperative MIMO NOMA Networks: Design and Performance Improvement for Cell-Edge Users

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 328 ◽  
Author(s):  
Chi-Bao Le ◽  
Dinh-Thuan Do ◽  
Miroslav Voznak
Keyword(s):  
Performance Improvement ◽  
Antenna Selection ◽  
Multiple Antennas ◽  
Base Station ◽  
Transmit Antenna Selection ◽  
Cell Edge ◽  
Single Antenna ◽  
And Performance ◽  
Quality Of Transmission

In this paper, we study two transmission scenarios for the base station (BS) in cellular networks to serve the far user, who is located at the cell-edge area in such a network. In particular, we show that wireless-powered non-orthogonal multiple access (NOMA) and the cell-center user in such a model can harvest energy from the BS. To overcome disadvantages of the cell-edge user due to its weak received signal, we fabricate a far NOMA user with multiple antennas to achieve performance improvement. In addition, the first scenario only considers a relay link deployed to forward signals to a far NOMA user, while both direct links and relay links are generally enabled to serve a far user in the second scenario. These situations, together with their outage performance, are analyzed and compared to provide insights in the design of a real-multiple-antenna NOMA network, in which the BS is also required to equip multiple antennas for robust quality of transmission. Higher complexity in computations is already known in consideration of outage metrics with respect to performance analysis, since the system model employs multiple antennas. To this end, we employ a transmit antenna selection (TAS) policy to formulate closed-form expressions of outage probability that satisfies the quality-of-service (QoS) requirements in the NOMA network. Our simulation results reveal that the performance of the considered system will be improved in cases of higher quantity of transmit antennas in dedicated devices. Finally, the proposed design in such a NOMA system cannot only ensure a downlink with higher quality to serve a far NOMA user, but also provide significant system performance improvement compared to a traditional NOMA networks using a single antenna.

scholarly journals Mode Selection and Spectrum Allocation in Coexisting D2D and Cellular Networks with Cooperative Precoding

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5417 ◽  
Author(s):  
Yu-Wei Chan ◽  
Feng-Tsun Chien ◽  
Chao-Tung Yang
Keyword(s):  
Cellular Networks ◽  
Mode Selection ◽  
Low Complexity ◽  
Block Diagonalization ◽  
Zero Forcing ◽  
Selection Rules ◽  
New Device ◽  
Selection Strategies ◽  
Comparable Performance ◽  
Noise Ratio

In this paper, we investigate the mode selection strategies for a new device-to-device (D2D) pair becoming active in a network with a number of existing D2D sensors or users coexisting with cellular users in a D2D-enabled heterogeneous network. Specifically, we propose two selection rules, the signal-to-interference-plus-noise-ratio (SINR)-based and the capacity-based, combined with two sets of different precoding schemes and discuss their impacts on the system under a variety of scenarios. While the cooperative block diagonalization (BD) among the cellular users combined with the zero-forcing (ZF) precoding among D2D users can eliminate interference observed at the new D2D receiving sensor, the maximum signal-to-leakage-and-noise-ratio (SLNR) precoding is often a preferred option due to low-complexity implementations and comparable performance. We note that the two selection rules, the SINR-based and the capacity-based, considered in this paper impact on the system differently, with interesting tradeoff from different perspectives. Finally, we provide insights by simulations into the best selection among the three modes depending on a variety of use cases in the network.

A User Selection Algorithm Based on the Combination of Block Diagonalization and SLNR Maximization

2013 ◽  
Vol 347-350 ◽  
pp. 2474-2478
Author(s):  
Wei Hong Fu ◽  
Cheng Wang ◽  
Nai An Liu ◽  
Qing Liang Kong ◽  
Wei Xin Tian
Keyword(s):  
User Selection ◽  
Rate Performance ◽  
Block Diagonalization ◽  
Selection Algorithm ◽  
Signal Noise ◽  
Performance Loss ◽  
Single Antenna ◽  
Sum Rate ◽  
Simulation Results ◽  
Noise Ratio

In this paper, a new precoding scheme is proposed based on the combination of Block Diagonalization (BD) and SLNR (Signal Leakage Noise Ratio) maximization. Then a new user selection algorithm is proposed based on the joint precoding scheme. BD precoding will cause performance loss in the single antenna terminals when the number of terminal antenna is inconsistent. The algorithm we proposed can overcome the drawback by using the maximum SLNR for single-antenna users and BD precoding for multi-antenna users respectively. Simulation results show that the proposed algorithm will enhance the system sum-rate performance significantly when SNR (Signal Noise Ratio) over 5dB. The performance improves by 30% when SNR reaches 20dB.

SIMULATION OF DIRECT SPREAD SPECTRUM COMMUNICATION SYSTEM ON THE HARDWARE MODULE EMONA DATEX. EVALUATION OF THE EFFECT OF NOISE ON THE QUALITY OF DEMODULATION

2019 ◽  
Author(s):  
Maksim Zhmakin ◽  
Irina Chadyuk ◽  
Aleksey Nadymov
Keyword(s):  
Spread Spectrum ◽  
Communication System ◽  
Spread Spectrum Communication ◽  
Direct Spread ◽  
Simulation Results

A variant of implementation of a communication system with direct spread spectrum is presented in this article, simulation results are also presented, the main parameters of the system are taken, and conclusions are drawn.

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