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In a downlink orthogonal frequency division multiple access (OFDMA) system, allocating sub-channels and power across multi-user can require excessive feedback of channel state information. An efficient proportional fair scheduling algorithm based on cluster feedback scheme is proposed in the paper. Simulation results show that the scheme needs only little feedback information while maintaining guaranteed...
In this paper, to solve the problem of feedback cost and performance loss for precoded spatial multiplexing with limited feedback, an novel nonlinear detection method based on limited feedback for precoded vblast is proposed, the corresponding criteria is used for select optimal codeword from the Grassmannian codebook at the receiving according to the channel state information, and feedback the precoding...
Our work focuses on selecting a trusted service from service consumer's perspective. First, we distinguish the two kinds of trust context to separate the ability of service as both a service provider and a service consumer in a service web; and we classify the reputation into two different categories. Second we generate a reputation metric model by improving Subject Logic. The trust decision model...
The use of an adaptive feedback canceller (AFC) based on signals pre-whitening/filtering in hearing aids seems very attractive, since it limits desired signal degradation when amplification gain is increased. In this paper, we present a comparative assessment of the performances of some existing pre-whitening decorrelation based methods. The used criteria consider the adaptive filter performances,...
This paper introduces a solution to enable self-optimization of coverage and capacity in LTE networks through base stations' downtilt angle adjustment. The proposed method is based on fuzzy reinforcement learning techniques and operates in a fully distributed and autonomous fashion without any need for a priori information or human interventions. The solution is shown to be capable of handling extremely...
The mobile WiMAX standard (802.16e) uses multiple-input multiple-output (MIMO) limited feedback linear precoding to exploit the channel state information at the transmitter. Although the performance of limited feedback linear precoding in relation to traditional open-loop MIMO-OFDM has been extensively studied in the literature, these studies commonly assume perfect channel estimation at the receiver...
In this paper, we propose a precoder using a minimum mean-square error (MMSE) criterion for a non-regenerative relay system. It is assumed that the relay knows the channel covariance information (CCI) of the relay-destination link and the full channel state information (CSI) of the source-relay link. We start by assuming the precoder has a specified structure. We derive an upper-bound of the mean-square...
In wireless dual-hop decode-and-forward (DF) relaying networks, multiple relay stations (RS) and users construct a multiple-in-multiple-out (MIMO) broadcast channel (BC). Due to unpredictable decoding failure, scheduling the transmission for the decode-and-forward broadcast channel (DFBC) should depend on not only channel qualities but also the availability of errorless data at individual RSs. Based...
In this paper we investigate channel state information (CSI) feedback strategy for a basestation (BS) scheduling multiple users for data transmissions in the downlink. For the purpose of fair provisioning of service among users with possibly heterogeneous channel statistics, we adopt scheduling algorithms based on scores: specifically the maximum quantile (MQ) scheduling is used as one of such schedulers...
The IEEE 802.11 standard conformant wireless communication stations have multi-rate transmission capability. To achieve greater communication efficiency, multi-rate capable stations use rate-adaptation to select appropriate transmission rate according to variations in the channel quality. This paper proposes a novel rate-adaptation scheme where the decision of rate selection relies on the mutual feedback...
The introduction of an uplink channel providing fast quality indication feedback on shared channels can improve packet data throughput in existing TDMA systems. It is shown that the uplink interference produced by this feedback channel is more than compensated by multi-user diversity gain.
This work presents a thorough study about the effects of the type of terminal voltage feedback in the dynamics of a power system that can be modeled as a single machine (synchronous generator) connected to an infinite bus. As is presented in this paper, the type of terminal voltage feedback employed directly affects the dynamic performance of power systems when they are subjected to load unbalance,...
This paper presents three models for dynamic analysis of inverter-based distributed generators equipped with voltage positive-feedback anti-islanding protection. The models analyzed are: the switched model, where the switches are represented in details, the average model, where the switches and signal generators are replaced by controlled voltage sources, and the small-signal model, where the average...
Using genetic algorithm and BP neural network method of combining, this paper has established dynamic forward feedback correction model and has completed the automatic adjustment of the various parameters required for rolling steel pipe, and has made rolled steel pipe system work at the best value. After the actual data validation, the model can more accurately pre-adjusted parameters to achieve intelligent...
This paper deals with the tracking control of robot manipulators. Proposed is a class of new SM-NPID-like tracking controllers consisting of a linear combination of the linear sliding mode control, proportional control, derivative control, nonlinear control shaped by a nonlinear function of position errors, linear integral control driven by differential feedback, and nonlinear integral control driven...
The paper analyzes the existing Linux virtual server (LVS) cluster load balancing algorithm and its inadequacies that not real-time dynamic full makes an appraisal to the load on the each server node, designs a new Dynamic Feedback Equalization Algorithm for Minimum Weight. The algorithm considers real-time load and response capacity of each server node, makes pre-load rate of the server combined...
Conventional methods used for solving greenhouse environment multi-objective conflict control problems may be more reasonable by adopting interval or region control objectives instead of point control objectives. In this paper, we propose a novel compatible control algorithm, and employ Multi-Objective Compatible Control (MOCC) strategy and an extant greenhouse model to achieve greenhouse climate...
The purpose of this research is study inverter simulation design for small wind power system. Through the comparative analysis, the main circuit choose high-frequency transformer form and using instantaneous voltage feedback control as control circuit. Using MATLAB software established a wind turbine inverter system circuit model, and gives out the circuit based on SPWM voltage feedback control system...
The emerging computational grid infrastructure consists of heterogeneous resources in widely distributed autonomous domains, which makes job scheduling very challenging. Although there is much work on static scheduling approaches for workflow applications in parallel environments, little work has been done on a real-world Grid environment for industrial systems. Utility Management Systems (UMS) are...
In this paper, the chaotification problem of a class of stable smooth-air-gap permanent magnet synchronous motor (PMSM) system is investigated. First, the smooth-air-gap PMSM plant is exactly represented by a simple T-S fuzzy model with a few fuzzy rules. Then, a nonlinear delayed feedback controller is designed by parallel distributed compensation technique. In addition, it is proved that the chaos...
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