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This paper presents an improved call admission control scheme to optimize the network operators' revenue while guarantying the quality of service (QoS) to the mobile terminals. The problem of call admission control (CAC) is modeled as a Semi-Markov decision process (SMDP), and the SMDP is solved by a reinforcement learning (RL) algorithm known as Q-learning. In the Q-learning algorithm, the reward...
A downlink radio resource allocation scheme based on ICI coordination for multi-cell OFDMA system is proposed. By dynamically determining frequency reuse factor, data rate of the users who have bad channel quality is increased. In order to reduce the packet delay of the users with high average packet arrival rate, the average packet arrival rate is used as a factor of the utility function in scheduling...
We investigate the topic for the direction of departure (DOD) and direction of arrival (DOA) estimation in bistatic multiple-input-multiple-output (MIMO) radar systems with the exploitation of array invariance. Several MUSIC-derived algorithms for angle estimation in MIMO radar have been presented and compared for their complexity costs against that of ESPRIT. The proposed scheme of multi-invariance...
A customer win-back model is developed to test the relationship among customer relationship management, commitment, and customer loyalty in this paper. This model involves customer relationship management, trust, emotion, price, commitment, loyalty and other factors. A number of data analyses are carried out, and the results show that customer relationship management has a positive impact on the formation...
Natural language processing is one of the most important applications in artificial intelligence (AI), while semantic disambiguation is one of branches and difficulties in natural language processing. This paper introduces three semantic disambiguation models, Bayesian model, hidden Markov model, and maximum entropy model. These three models are used to test and compare with. The results show that...
Recently, the service of cellular phone which is dependent on the location is spreading widely. Various techniques are suggested for the location estimation in indoor, however, indoor location estimation techniques have many subjects with a cost and an aspect of the accuracy. To deal with these subjects, we propose a quite new hybrid indoor location estimation method for paying attention to a smart...
The resultant escalation of cyber attacks and the emerging needs of operators to increase their coverage with a blended service offering, that enhances user mobility, have raised a need for an architecture that can find global digital identities and link them back to users' activities in the mobility universe. In this paper, our focus is to provide an architecture that associates mobile users' credentials...
Wireless local area network (WLAN) has progressed quickly and found its wide applications recently because of mobility, flexibility, extensible and low cost. WLAN has become very important part of future communication. Quality of service is a hot-point of research about wireless network. Two wireless network loss models, namely random uniformed model and Gilbert-Elliott model, are analyzed. The theoretic...
A new state-space model for flexible satellite is set up. This paper focuses on the satellite system subjected to modal frequency uncertainty. The uncertainty is nonlinear, and a function of disturbance parameters. This kind of disturbance's upper bound and robust control for this class of uncertain systems are studied. Finally, by simulation experiment, it is shown that the method in this paper has...
Considering the characteristic of heterogeneous wireless sensor networks, the clustering algorithm based on data content for heterogeneous sensor network is proposed. In cluster construction stage, according to the various sensor node types in CADC algorithm, the same types of nodes is divided into the same cluster and different types of nodes can not be divided into the same cluster. In the cluster...
This paper presents the investigations for triple-polarization sensitive uniform square array (USA) on the basic modeling of blind trilinear/quadri-linear receivers. We derive the multilinear-based approaches which utilize no knowledge for direction of arrival (DOA) or polarization information. The quadri-linear-based approach has better bit-error-rate (BER) performance than the trilinear-based one...
In this paper, a data fusion algorithm based on weighted least square is proposed to determine the attitude of low-rotary agile projectile. Three micro electro-mechanical system (MEMS) accelerometers are used as strapdown inertial measurement units (IMUs), and the unscented Kalman filter is used to directly estimate attitude of projectile by gravity components of measurement values of three accelerometers...
According to the deficiency of traditional Fourier transform in faults diagnosis during the early period, the paper puts forward a new method to detect the abrupt change signal in the stator current based on wavelet module maximum theory. Simulation results show that the designed method can detect and locate the early faults even with trivial characteristic quickly and accurately.
With the development of computer network technology and mobile communication technology, a new kind of distance education mode, mobile learning (M-Learning), was created. Mobile learning can provide learners with the maximizing learning autonomy, and also can provide the instructors and education administrators with more flexible teaching and managing methods. Mobile learning is a complicated engineering...
In order to satisfy the demand of rapid growth of multimedia applications in mobile ad hoc network (MANET), this paper proposed an improved QoS routing algorithm based on AODV. It adopted the mechanism of intermediate request returning, selected flooding, and local route recovery. Results from extensive performance simulation of the proposed protocol demonstrate that it reduces the control overhead...
Temporal parameters are absolutely necessary in models for video quality evaluation. By detecting the temporal information (TI), it is able to design the proper parameters which can be used in the application of video quality evaluation. Nowadays, the conventional method is to calculate the RMS (root mean square) energy of the temporal gradient. Its workload would enhance greatly when the number of...
In multiple input and multiple output (MIMO) system, the channel code is very important and complex compare single antenna system. Space-time codes (STC) were proposed to solve the problem. In space-time codes family the space-time block code and space-time trellis code are applied in many cases. In this paper we proposed the maximum likelihood detector used in space-time trellis codes system, and...
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