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Offloading the LTE data services to unlicensed spectrum has been considered by 3GPP in Release 13, which is defined as LAA (Licensed-Assisted Access). Unlicensed band is attractive because of its large amount of spectrum resource. However, coexisting with wireless devices already existing in unlicensed spectrum (such as Wi-Fi) is a primary issue be solved effectively. This paper proposed two dynamic...
In this paper, a novel receiver design is proposed which combines two different approaches: decision feedback equalization (DFE) and equal gain combining (EGC). To make these two approaches work efficiently, the system is implemented in the frequency domain which can make full use of the advantages of both approaches. Simulation results demonstrate that our proposed design achieves greatly improved...
Pilot subcarriers are very useful in the measurement of channel indicator such as CINR, frequency offset estimation and channel estimation. They are applied widely in many existing standards such as IEEE 802.11, IEEE 802.16 and IEEE 802.22. In this paper, a set of pilot patten is proposed for a network operating in VHF/UHF band based on 802.16 WiMax design pattern. Rationales behind the choice of...
In view of the application problem of the tactic maneuver of stealth target, the electromagnetic model of one typical stealth target is established and all airspace static RCS is gained in firstly. Secondly, the relationship between tactic maneuver and the line of sight of radar is analyzed. And then the dynamic RCS series is exhibited through different yaw, pitch and rolling maneuver. Finally, the...
Performance prediction for the high performance computer system is of great importance for designing, implementing, and optimizing system. As a widely used technique for predicting performance, simulation method attracts more and more attention from the research community. Based on analyzing the problems in the current performance simulation techniques, we present a key idea of the performance simulator...
The fixed-complexity sphere decoder (FSD) has been proposed to attain the near-optimal performance achieving the same diversity order as the maximum-likelihood decoder (MLD) recently. However, it suffers great redundant computations resulting in high power consumption. In this paper, we conduct an improved algorithm for the original FSD by using early termination (ET). This algorithm (abbreviated...
On the basis of the previous establishment of the testbed network structure for the emulated test, this paper focuses on the transmit power analysis of the practical network and the advanced testbed network for 3G/B3G systems. The advanced testbed structure was established previously by China Mobile Communication Corporation (CMCC). Theoretical analysis, system-level simulation, and outfield testing...
A control strategy for mild hybrid electric vehicle was put forward, which was mainly composed of torque distribution and energy management algorithm. The model of control strategy was constructed on the platform of Matlab/Simulink, joined with CRUISE. The co-simulation and analysis was carried on. Consequently, the control strategy and energy management algorithm could be manifested to meet the demands...
In recent years, M2M (machine to machine) communications has increasingly been seen as a new growth area for wide-area wireless technologies which were designed for voice and high-speed packet data applications. In this paper, we use simulations to estimate the capacity of M2M applications over one of the widely used 3G wireless systems, CDMA2000 1x. We present capacity estimates of the CDMA2000 1x...
In this paper, we use stochastic network calculus to analyze the performance bounds for a cognitive radio network with two classes of input traffic. First, stochastic service curves for primary users and secondary users are obtained based on the system model and stochastic network calculus. Then, we derive the general expressions of backlog and delay bounds for both primary and secondary users under...
The surface of insulators in the GIL is prone to generate charges under a DC high-voltage for a long time, which has a great impact on insulation performance of the insulators. The accumulation of the surface charges is mainly related to surface normal field on insulators. Decreasing surface normal field on insulators can reduce the rate and amount of accumulation of the surface charges. By the way...
It is widely accepted that the emergence of cognitive radio (CR) will lead to a wireless communication revolution. Spectrum sensing is one key process of CR, which makes effective use of scarce spectrum. Two novel schemes, clustering and locating schemes, are presented for spectrum sensing based on energy detection on the condition that there are multiple primary users in the cognitive radio network...
Water resources constrain the scale and quality of social and economic development in many water shortage cities and regions. Thus, the management via dynamic water resources prediction is a key for the overall city strategic planning. In this study, an integrated dynamic model of water consumption was developed using system dynamics (SD) and based on water resources carrying capacity (WRCC) theory...
In this paper, based on the relationships among customer satisfaction, repeated purchases, customer loyalty, complaint-voicing rate and complaint-dealing ability, a model is built to analysis customer flow resulting from the complaint management with the system dynamics method. Applying Vensim 5.0, customer flow is simulated with the data from China's mobile market. Through analyzing the simulation...
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