Xin Xiangjun

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This paper presents a constructive discussion and inclusive review on advancements in the coded modulation free-space optical (FSO) communication system and corresponding techniques. These techniques mainly include channel model, forward error correction (FEC) and modulation schemes. Firstly, a complete view of FSO system is presented which contains the(More)
An optical Amplitude and Pulse Position Modulation (APPM) mapping scheme for strong turbulent atmospheric channel is proposed to optimize Bit Error Rate (BER) performance. In this scheme, a non-equidifferent amplitude series is designed based on quantitative BER analysis of the specific A×M APPM demapping procedures containing time slot selection and(More)
We proposed a new scheme for generation of coherent and frequency locked LED based optical multi-carriers by using dual port Mach-Zehnder modulator and WDM Demux and Mux. After employing the proposed scheme we successfully generated different number of multi-carriers with excellent tone to noise ratios (TNR) and minimum amplitude difference. The frequency(More)
A novel trellis coded-4×8 overlapping amplitude and pulse position modulation (TC-4×8AOPPM) scheme is proposed to enhance bit error rate (BER) performance of free-space optical communication (FSO) system. In addition, an uncoded AOPPM referential scheme is also designed. The schemes manage to decrease BER by designing gamma-gamma (GG) channel(More)
To improve the robustness of the Low Earth Orbit (LEO) satellites networks and realise load balancing, a Cross-layer design and Ant-colony optimization based Load-balancing routing algorithm for LEO Satellite Networks (CAL-LSN) is proposed in this paper. In CAL-LSN, mobile agents are used to gather routing information actively. CAL-LSN can utilise the(More)
Analyzes the switching characteristics of a single mode optical fiber. In the dispersion fiber not only is the switching signal delayed, but also the switching speed is limited. The formula for calculating the switching time (rise time or fall time) is given. The results show that the switching time is proportional to the square root of the absolute value(More)
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