Institute of China Electronic Equipment System Engineering Company

Beijing, China

Institute of China Electronic Equipment System Engineering Company

Beijing, China
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Liu Y.,Tsinghua National Laboratory for Information Sciences and Technology | Wan X.,Tsinghua National Laboratory for Information Sciences and Technology | Zheng X.,Tsinghua National Laboratory for Information Sciences and Technology | Liu Z.,Institute of China Electronic Equipment System Engineering Company | Hua N.,Tsinghua National Laboratory for Information Sciences and Technology
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

The routing and spectrum assignment (RSA) is one of the key problems in flexible optical networks. When in a gridless fashion, the shortest-path RSA algorithms have exponential computational complexity, and are thus not suitable to be employed in real networks. On the other hand, today most optical components cannot support fully gridless tunability, which also limits the application of gridless RSA schemes. In this paper, we propose a novel grid-based spectrum-scan routing (SSR) scheme in flexible optical networks. The SSR scheme achieves optimal routing with a polynomial computational complexity. Compared with other RSA schemes, SSR has shorter computation time, lower blocking probability, and higher resource utilization. © 2011 SPIE-OSA-IEEE.


Dong Y.,PLA Air Force Aviation University | Zhao S.,PLA Air Force Aviation University | Hou R.,Institute of China Electronic Equipment System Engineering Company | Deng B.,PLA Air Force Aviation University
Optical and Quantum Electronics | Year: 2015

Aiming at the characteristics of dynamic routing and limitation on power in satellite optical network, a wavelength-shift-free regenerative scheme based on two-stage offset filter is put forward. Making use of the property that the signs of chirp induced by self-phase modulation are opposite in semiconductor optical amplifier (SOA) and high nonlinear fiber (HNLF), the scheme imposes a red-shifted filter and a blue-shifted filter respectively on the signals after SOA and HNLF, which not only realizes a two-stage regeneration for signals, but also compensates the frequency offset and keeps the wavelength unchanging before and after the regenerator. The results show that the Q factor of signals can be improved 6 dB, and the timing jitter caused by one-stage offset filter can be suppressed effectively. © 2015 Springer Science+Business Media New York


Liu H.,Tsinghua University | Hua N.,Tsinghua University | Wang L.,Tsinghua University | Zheng X.,Tsinghua University | Liu Z.,Institute of China Electronic Equipment System Engineering Company
Photonic Network Communications | Year: 2013

Bandwidth-variable (BV) optical networks have been proposed as a novel technology to provide spectrum-efficient transportation. In order to study the performance of the BV optical networks, we propose a BV extension to RSVP-TE signaling protocol and implement it with different routing schemes on our large-scale ASON test-bed. Results show that the adaptive routing (AR) combined with forward reservation RSVP-TE signaling (AR+RSVP-fBV) scheme has lower routing blocking probability; however, since its signaling blocking probability is higher than the fixed routing (FR) combined with backward reservation RSVP-TE signaling (FR+RSVP-bBV) scheme, it has no significant advantage in the overall blocking performance, especially in a highly dynamic network scenario. The introduction of spectrum conversion cannot improve the overall blocking performance significantly due to its higher signaling blocking probability, and worse yet, it increases setup delay. © 2013 Springer Science+Business Media New York.


Zhou B.,Beijing Institute of Technology | Wang J.,Institute of China Electronic Equipment System Engineering Company
Journal of Semiconductor Technology and Science | Year: 2015

A CMOS relaxation oscillator, with high robustness over process, voltage and temperature (PVT) variations, is designed in 0.18 μm CMOS. The proposed oscillator, consisting of full-differential charge-discharge timing circuit and switched-capacitor based voltage-to-current conversion, could be expanded to a simple open-loop frequency synthesizer (FS) with output frequency digitally tuned. Experimental results show that the proposed oscillator conducts subcarrier generation for frequency-modulated ultra-wideband (FM-UWB) transmitters with triangular amplitude distortion less than 1%, and achieves frequency deviation less than 8% under PVT and phase noise of –112 dBc/Hz at 1 MHz offset frequency. Under oscillation frequency of 10.5 MHz, the presented design has the relative FS error less than 2% for subcarrier generation and the power dissipation of 0.6 mW from a 1.8 V supply. © 2015, Institute of Electronics Engineers of Korea. All rights reserved.


Zhou B.,Beijing Institute of Technology | Wang J.,Institute of China Electronic Equipment System Engineering Company
Journal of Semiconductor Technology and Science | Year: 2015

A frequency modulated ultra-wideband (FM-UWB) transmitter with a high-robust relaxation oscillator for subcarrier generation and a dual-path Ring VCO for RF FM is proposed, featuring low power and low complexity. A prototype 3.65-4.25 GHz FM-UWB transceiver employing the presented transmitter is fabricated in 0.18 μm CMOS for short-range wireless data transmission. Experimental results show a bit error rate (BER) of 10−6 at a data rate of 12.5 kb/s with a communication distance of 60 cm is achieved and the power dissipation of 4.3 mW for the proposed transmitter is observed from a 1.8 V supply. © 2015, Institute of Electronics Engineers of Korea. All rights reserved.


Dong Y.,PLA Air Force Aviation University | Zhao S.,PLA Air Force Aviation University | Hou R.,Institute of China Electronic Equipment System Engineering Company | Deng B.,PLA Air Force Aviation University
Optical and Quantum Electronics | Year: 2015

Aiming at the characteristics of dynamic routing and limitation on power in satellite optical network, a wavelength-shift-free regenerative scheme based on two-stage offset filter is put forward. Making use of the property that the signs of chirp induced by self-phase modulation are opposite in semiconductor optical amplifier (SOA) and high nonlinear fiber (HNLF), the scheme imposes a red-shifted filter and a blue-shifted filter respectively on the signals after SOA and HNLF, which not only realizes a two-stage regeneration for signals, but also compensates the frequency offset and keeps the wavelength unchanging before and after the regenerator. The results show that the Q factor of signals can be improved 6 dB, and the timing jitter caused by one-stage offset filter can be suppressed effectively. © 2015, Springer Science+Business Media New York.


An J.-K.,Xidian University | Tian B.,Xidian University | Yi K.-C.,Xidian University | Yu Q.,Institute of China Electronic Equipment System Engineering Corporation
Huanan Ligong Daxue Xuebao/Journal of South China University of Technology (Natural Science) | Year: 2011

Proposed in this paper is a blind identification algorithm of orthogonal frequency division multiplexing (OFDM) signals based on multifractal features, which is applied to the modulation identification in non-cooperative communication. In this algorithm, first, two items, namely the singularity exponent of the maximum multifractal value from communication signals and the span of multifractal from the amplitude of twice Fourier transform of squared analytic communication signals, are extracted as signal feature parameters. Then, a multi-layer decision tree separator is constructed to identify OFDM signals and single-carrier signals. The feature parameters extracted by this algorithm are robust to the number of subcarriers, the length of the cyclic prefix of OFDM signals, the raised-cosine shaping roll-off factor of single-carrier signals and the signal-to-noise ratio (SNR), and the signals are processed in intermediate frequency channel. Thus, the synchronization in time and frequency domains is not required. Simulated results show that the proposed algorithm can identify OFDM signals with a high average identification rate in a wide SNR range.


Liu Y.,PLA Air Force Aviation University | Zhao S.,PLA Air Force Aviation University | Gong Z.,Science and Technology on Reliability and Environmental Engineering Laboratory | Gong Z.,Beijing Institute of Spacecraft Environment Engineering | And 2 more authors.
Optics Communications | Year: 2015

Performance of optical inter-satellite communication system is influenced by the harsh space radiation environment. Gamma radiation effects on main devices of communication system are analyzed and on the basis of existing experimental data, performance degradation of on off keying (OOK), differential phase shift keying (DPSK) and homodyne binary phase shift keying (BPSK) based system under 1 kGy gamma irradiation is simulated. Variation of Q factors and bit error ratio of these systems with different radiation position are achieved and discussed. The result shows that it is more urgent to improve the radiation hardness of transmitter, and the introduction of local laser is a considerable method to reduce gamma radiation impact on system performance. © 2015 Elsevier B.V.


Yin S.-Y.,Tsinghua University | Yin S.-Y.,Institute of China Electronic Equipment System Engineering Company | He Y.-Z.,Institute of China Electronic Equipment System Engineering Company | Yin H.,Institute of China Electronic Equipment System Engineering Company
Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of Science and Technology (Natural Science Edition) | Year: 2012

To solve such problems as the high in-orbit testing cost and the difficult evaluation of Multiple-Beam Antenna with large number of beams, an antenna evaluation strategy based on the feed properties was proposed, through the analysis of the beam forming principle of the composite beams and exploration of the relation between the beam forming network and the feed Source Array. By employing the least squares evaluation method, the typical beam selection, combination and average estimation error for the feed properties were analyzed. The simulation results show the quantitative correlation among the typical beam number, combination and the average estimation error, and the selection of the typical test beam number and the optimal test beams sequence in actual conditions. The proposed method can provide an excellent reference value to process the In-Orbit testing data efficiency and reduce the complexity of finding the optimal test beams sequence for a practical system.


He Y.-Z.,Institute of China Electronic Equipment System Engineering Company | Yin S.-Y.,Institute of China Electronic Equipment System Engineering Company | Wang J.-C.,Institute of China Electronic Equipment System Engineering Company
International Journal of Communication Networks and Distributed Systems | Year: 2014

In order to accurately test the satellite's shaped-reflector antenna pattern and efficiency in orbit, an in-orbit test method of the antenna pattern via satellite's attitude offset and the shaped beam forming principle is proposed. Key points of the method testing the antenna patterns are the edge of roll-off, side-lobe suppression, weighted region and level fluctuation performances, etc. By discussing the relationship between the satellite's offset angle and the test point's longitude and latitude, the proposed method employs the error analysis and testing data correction which combined with the compact test range data. Test results show that the radiation performance of satellite's antenna is stable. Copyright © 2014 Inderscience Enterprises Ltd.

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