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Simultaneous wireless information and power transfer (SWIPT) formed by the mixture of communication technology and power transmission is one of the research focuses in the field of wireless communication. This paper introduces the architecture of the SWIPT system, analyzes the key technologies, presents a 2.45GHz microwave rectifier circuit at low input power for energy harvesting. Finally, with the...
Frequency hopping is one of the classic examples of spread-spectrum communications. This paper is about the study of the strategy of the synchronous recognition process. In other words, the topic is in which condition the hopping frequency in the receiver and transmitter can be identified. From the theoretical point of view, the more uniform frequency between the transmitter and the receiver, the...
The source coding problem with common reconstruction constraint is considered, where the encoder can produce an exact copy of the compressed source reconstructed by the decoder. In this paper, we consider the variation of this problem in which the encoder can observe the side information which may be different from the decoder side information. For the doubly-symmetric binary source, we derive the...
Research on anti-fading is an important problem in wireless communication system. Because of the existence of guard interval, the high-efficiency extended binary phase shift keying (EBPSK) modulation is provided with excellent anti-fading characteristics. The bit error rate (BER) performance of EBPSK system in flat Rayleigh fading channel is analyzed qualitatively. Then a diversity scheme with selection...
In order to solve the problem of cooperative issue in single frequency network (SFN) positioning system, in this paper, a cooperative positioning scheme using the fundamental characteristic of SFN is proposed. Some different signal levels are described for cooperative signal selection. According to the difference between the cooperative signal levels, the proper signal can be selected for cooperative...
Based on the finite element method, central difference software LS-DYNA-970 platform, this paper using the Euler algorithm, simulation of the 3D jet forming. Study on the uniform thickness of curved cone shaped cover is being executed, reveal the metal forming mechanism of various arc radius curved generatrix covers and detailed study the speed distribution in all parts of the formed jet penetrator...
High-speed and high-efficiency communication is a hot problem in the research field of communication. In this paper, one of higher efficiency ultra narrow-band (UNB) modulation schemes, named Extended Binary Phase Shift Keying (EBPSK), was presented. Then, aiming at the tiny waveform difference and detection problems, several novel detectors based on the Artificial Neural Network (ANN) are proposed...
Torque ripple seriously affects the performance of brushless DC machine (BLDCM). Analyzed the principle of current hysteresis controller reducing non-commutation phase current which made BLDCM system become more hysteretic, the precise model of BLDCM is difficult to obtain. The fuzzy-PID control based on current hysteresis controller was proposed to diminish torque ripple and overcome the shortcomings...
Extended Binary Phase Shift Keying (EBPSK) modulation with very high spectra efficiency is a hot research problem in the field of communication. This paper proposes an optimum design method of digital filters in EBPSK demodulation aiming at very tiny waveform difference, which is based on the minimum bit error rate (BER) criteria. Simultaneously, the inter symbol interference is considered as a constraint...
This article deals with a novel architecture for IP routing table construction, on the basis of a single set-associative hash table to support fast longest prefix matching (LPM). The proposed architecture uses two key techniques to lower table storage required drastically: (1) storing transformed prefix representations and (2) accommodating multiple prefixes per table entry via prefix aggregation...
Aiming at the serious problem in boosting demand for frequency resource, this paper proposes a new transmission system based on phase locked loop (PLL). And extended binary phase shift keying (EBPSK) with its optimized power spectrum is brought forward for efficient utilization of bandwidth. System parameters are discussed in detail and some comparisons are made. In the end, simulation results demonstrate...
A hybrid modulation scheme for present amplitude modulation (AM) broadcasting system is proposed. Based on double sideband (DSB) modulation, another method, very minimum additive waveform keying (VMAK) is brought forward in the paper so as to more sufficiently utilize the bandwidth of each broadcasting channel. Digital multimedia data can be transferred while broadcasting analog audio signal. Computer...
A hybrid modulation scheme for present Amplitude Modulation (AM) broadcasting system is proposed. Based on Double Sideband (DSB) Modulation, another method, Very Minimum Additive waveform Keying (VMAK) is brought forward in the paper so as to more sufficiently utilize the bandwidth of each broadcasting channel. Digital multimedia data can be transferred while broadcasting analog audio signal. Computer...
Aiming at the serious problem in boosting demand for frequency resource, this paper proposes a new transmission system based on Phase Locked Loop (PLL). And Extended Binary Phase Shift Keying (EBPSK) with its optimized power spectrum is brought forward for efficient utilization of bandwidth. System parameters are discussed in detail and some comparisons are made. In the end, simulation results demonstrate...
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