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In this paper, we study the dynamical behavior and quantum metrology in a rotating Nitrogen-Vacancy (NV) center system which is subject to an external magnetic field. Based on the recently realized rapid rotation of nano-rotor [J. Ahn, Z. Xu, J. Bang, Y.-H. Deng, T. M. Hoang, Q. Han, R.-M. Ma, T. Li, Phys. Rev. Lett. 121, 033603 (2018) and R. Reimann, M. Doderer, E. Hebestreit, R. Diehl, M. Frimmer,...
The pressure regulator is a critically important element in a pneumatic system. It reduces the pressure of a high-pressure air source to the required level for a given pneumatic load and maintains it at a steady level. However, the pressure reduction between the inlet and outlet of a pressure regulator results in a significant power loss, especially when the pneumatic load requires only a low pressure...
The ergodic capacity of dual-hop fixed gain wireless communication systems is investigated under mixed fading environment. In such environment, the wireless links of relaying system undergo mixed multipath/shadowing fading conditions, where one link is subject to the Nakagami-m fading, the other link is subject to the composite Nakagami-lognormal fading which is approximated by using mixture gamma...
In this paper, we investigate the end-to-end performance of a dual-hop relaying system with fixed gain relays over mixed fading environment. In such environment, the wireless links of the considered system undergo mixed multipath/shadowing fading conditions, where one link is subject to only the Nakagami-m fading, the other link is subject to the composite Nakagami-lognormal fading which is approximated...
The ergodic capacity of dual-hop variable gain amplify-and-forward wireless communication system is investigated over independent non-identical composite Nakagami-lognormal fading channels using mixture gamma distribution. A novel exact closed-form expression of ergodic capacity for the considered system is derived. Numerical and simulation results are shown and discussed to verify the accuracy of...
In this paper, we present the end-to-end performance of a dual-hop amplify-and-forward relaying system over Nakagami-lognormal (NL) fading channels by using mixture gamma (MG) distribution and Generalized-K (KG) distribution, respectively. Novel closed-form expressions for the probability density function, the cumulative distribution function and the moment-generation function of the end-to-end signal-to-noise...
In this paper, we present the end-to-end performance of a dual-hop cooperative system over independent non-identical composite Nakagami-lognormal (NL) fading channels using Mixture Gamma (MG) distribution. Novel closed-form expressions for the Probability density function (PDF) and the Moment-generation function (MGF) of the end-to-end Signal-to-noise ratio (SNR) are derived. Moreover, the average...
The suppression of random interference nulling for uniform circular array using an improved binary coding method is investigated in this paper, which is based on Genetic Algorithm (GA) applied to smart antenna beamforming. The code lengths of the algorithm's least amplitude significant bits and least phase significant bits are analyzed, and their impacts on algorithm's performance are discussed. As...
In this paper, we investigate decode-and-forward (DF) cooperative diversity over independent and identically distributed (i.i.d) Weibull fading channel using selection combining (SC) technique, derive a closed form expression for the probability density function (PDF) of the signal-to-noise ratio (SNR) for the Weibull fading distribution, and obtain closed form expressions for the average symbol error...
This paper proposes an amplify-and-forward cooperative system based on Destination-Driven for cooperative wireless networks. The BER (Bit Error Rate) of BPSK (Binary phase-shift Keying) and the outage probability for the proposed system are analyzed over independent and identically distributed (i.i.d) Rayleigh fading channels, and their closed-form expressions are derived. The theoretical analysis...
The suppression of fixed interference for uniform circular array using an improved binary coding method is investigated in this paper, which is based on Genetic Algorithm. The code lengths of the algorithm's least amplitude significant bits and least phase significant bits are analyzed and their impacts on performance are discussed. Finally, a general selection range of parameters is given and the...
In this paper, we investigate cooperative diversity using amplify-and-forward (AF) relaying over independent and identically distributed (i.i.d.) Weibull fading channels with selection combining (SC) and derive a approximate closed form expression for the probability density function (PDF) of the signal-to-noise ratio (SNR) for the Weibull fading distribution, Then closed form expression for the average...
This paper studies a destination-driven cooperative diversity protocol for multihop wireless networks. The regenerative outage performances of the proposed protocol are developed over independent but not identically distributed (i.n.d) Nakagami fading channels. The numerical results show that the proposed protocol not only provides an effective selection scheme for cooperative nodes but achieves a...
In order to study the impact of node mobility upon cooperative communication, an amplify-and-forward (AF) cooperation model was established. Using bit error rate (BER) as a metric, the cooperation parameter was defined. Compared with Alamouti and direct communication separately, cooperative communication achieved its upper and lower bound. The simulation results show that, under the same channel conditions,...
For the concerned TD-SCDMA and its LTE cellular mobile radio system introduced in this paper, there are already some useful algorithms concerning multi-user detection to eliminate inter-symbol interference (ISI) and multiple-access interference (MAI). Since only home cell multiple users are included, those algorithms can only combat ISI and MAI between home cell users. Interferences from users of...
In order to study the impact of node mobility upon distributed cooperative communication, a three-node model was established. It used Alamouti coding. Using bit error rate as a metric, the cooperative communication parameter was defined. Compared with Alamouti2times1 and direct communication separately, cooperative communication achieved its upper and lower bound. The simulation results show that...
Millions of laptops ,PDAs and other mobile devices remain unused most of the time and this huge resource repository can be potentially utilized in the Grid environment. We are working on a system for constructing a auction-bargaining theoretic pricing model to address load balancing and optimization issues in mobile grids. In the model, first a auction protocol is to select the cheapest one among...
This paper proposes a multi-node cooperative threshold selection maximum ratio combining (TS-MRC) system for multi-hop wireless networks. We analyze and derive the regenerative outage probability of TS-MRC system and MRC-based cooperative system over Nakagami fading channels. The numerical and simulation results show that TS-MRC achieves a tradeoff between the system performance and the process capability...
We propose an adaptive generalized selection cooperative diversity system with threshold selection for wireless networks. The decoded-and-forward performances for the proposed system are analyzed over independent but not identically distributed Rayleigh fading channels. The close-form expressions of important performance measures including outage probability are derived using moment generating function...
This paper proposes an improved genetic algorithm (GA) assisted beamforming for a one-dimensional linear antenna array. Its performance of random interference nulling is studied. We design an improved binary code method for GA, which introduces several parameters to conveniently control the solution precision and search space. The simulation results show that the improved algorithm can efficiently...
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