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Based on Parallel Combinatory Spread Spectrum (PCSS) communication system, an improved PCSS system is proposed with PN sequences serial-parallel combinatory connecting. Using the character of internal memory between information data, optimization treatment is done in the receiver. The system model is built and simulated in AWGN channel, and the properties and error bit probability are discussed. The...
A patch antenna with printed superstrate layer for dual-frequency operation is presented. A metallic parasitic split-loop in meander shape is printed on the superstrate in order to produce a second resonance in terms of electromagnetic coupling resonance effect. In the design, the tunable frequency response is achieved by changing the length of the strips incorporated in the loop. Simulation results...
A circularly polarized, electrically small antenna (ka=0.64) was presented. To improve its impedance bandwidth, two non-Foster circuits designed with the same configuration were, respectively, inserted into two Near-Field Resonant Parasitic (NFRP) elements of the antenna. Simulation results show that the antenna's impedance and axial ratio (AR) bandwidth are both expanded due to the introduction of...
In this paper, we propose a hybrid cooperative beamforming and jamming scheme to enhance the physical-layer security in the two-way relay network with an eavesdropper and a primary receiver. Cooperative beamforming and jamming are designed to maximize the secrecy rate with a total transmit power constraint of the relays and interference power constraint at the primary receiver. The beamformer weights...
In a dc microgrid, the bidirectional dc-ac converters are usually operated as a utility interface to control the dc bus voltage and ensure the power balance within the system. In the case of grid failure, power limiting or malfunction condition for dc-ac converters, the dc microgrid will lose its power balance unit. At that time, the distributed generations in dc system will change their operation...
In this paper, we propose a filter-and-forward (FF)beamforming strategy in the secondary relays for the one-way cognitive relay network with frequency selective fading channels. Our aim is to optimize the beamforming coefficients and the secondary transmitted power to maximize the SINR at the secondary destination, while satisfying the interference constraint on the primary network and the total relays'...
Distributed beamforming (DBF) is a cooperative technology that several nodes transmit a common message to a receiver efficiently. The key to DBF is to ensure every node's signal adds coherently at the receiver by synchronizing node's carrier phase. In this paper, we present a closed-loop deterministic phase synchronization algorithm in order to pursue less synchronization time, less feedback information,...
The complex pairing access of multiple users based on network coding is discussed in this paper. In the system, through Network Coding and registration matrices, the same spreading code is allocated to each pair of users. New decision regions are considered. Then we proposed new interference reducing approach for the scenario, comfortable for relay and mobile station. Simulation results demonstrate...
The model of the mobile communication location management with self-similar stream is proposed. This paper investigates the model and proposes a probability formula of the count of the location areas for a mobile crossing by the density evolution method of vector Markov processes and overcoming analytic difficulty. These results provide a theoretical basis for quantitative evaluation of mobility management
A wireless bridge health information concentration acquisition system based on ZigBee is proposed in this paper. It can be used for bridge health information collected, to provide an efficient data for bridge protection. The monitor system includes acquisition node and receiving equipment. In actual use, the acquisition node was designated deployment, through specific deployment device. The data that...
To solve the problems in modulation recognition of time-frequency overlapped two-signal in the single-channel, an algorithm based on cyclic cumulants used modulation recognition is presented. Through computing the fourth-order cyclic cumulants of pretreated band signals, the feature vector for classification was extracted, and then use the minimum-error criterion to classify time-frequency overlapped...
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