Microwave photonics (MWP) studies the interaction between microwaves and optical waves for the generation, transmission, and processing of microwave signals (i.e., three key domains), taking advantage of the broad bandwidth and low loss offered by modern photonics. Integrated MWP using photonic integrated circuits (PICs) can reach a compact, reliable, and green implementation. Most PICs, however, are recently developed to perform one or more functions restricted inside a single domain. Herein, as highly desired, a multifunctional PIC is proposed to cover the three key domains. The PIC is fabricated on an InP platform by monolithically integrating four laser diodes and two modulators. Using the multifunctional PIC, seven fundamental functions across microwave signal generation, transmission, and processing are demonstrated experimentally. Outdoor field trials for electromagnetic environment surveillance along in-service high-speed railways are also performed. The success of such a PIC marks a key step forward for practical and massive MWP implementations.

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the performance of UAV (Unmanned Aircraft Vehicle) data link is restrained by wireless channel, in this paper, we analyzed theoretically the characteristics of wireless channels of UAV data link, studied the simulation channel models of flat fading and selective fading which are suitable for low-speed command and remote measuring information and high-speed sensor information respectively, which will be used for designing the system of UAV data link and enhance the performance of UAV data link system.

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A solution to improve the flexibility of simulation under the circumstance of SoS (System-of-Systems) combat has been provided in this paper. A CAS (Complex Adaptive System) based modeling method is used in this method after analyzing the military multi-layer architecture and surveying the modeling method, by joining CAS and MRM(Multi-Resolution Modeling), a military system is modeled in several resolution and some key technology are probed into and discussed in this paper. The analysis results show that method has great current significance and reference value for modeling combat system.

OFDM-IDMA system with perfect performance is the key technology of 4th mobile communication. in this paper, we simulated the performance of OFDM-IDMA in AWGN and quasi-static Rayleigh channel respectively, the simulation results indicate that the performance of multi-user is close to the single use as the increase of SNR, and the error-bits curve descends obviously, which means OFDM-IDMA system can be used to the complex electromagnetic environment and high-speed data transmission.

Abstract. In large swimming hall for international events, seat arrangement and partition could affect indoor thermal environment. In this paper, a 4480 seats swimming hall was selected as the typical study object. Then different seat arrangements of swimming hall during competition events were summarized. Simulation experiments of single model were conducted through software of Airpak as research platform. After each experiment, results of temperature, relative humidity, speed and mean age of air, PMV and PPD of the space in Airpak post item were collected and recorded as experiment data. Optimal solution is proposed in aspect of thermal comfort.