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As in-line interference between geostationary(GEO) and Non-Geostationary(NGEO) systems is becoming more and more serious. We propose an efficient utilisation of the adaptive modulation and coding (AMC) scheme for spectral coexistence of GEO and NGEO satellites to mitigate in-line interference. Results of Simulation show that the proposed scheme can improve the performance of the NGEO system in comparison...
This paper presented a multi-rate Star-QAM encoding and decoding method based on the hierarchical coding which could be adjusted to achieve the channel coding efficiency and modulation. The design is based on the combination of soft / hard decision in layered decoding. We have successfully increased BER performance to 0.5dB which achieved 10−5 when SNR is 11 compared to no stratification codec considering...
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 applicable decoding and demodulation methods. Simulation...
A LDPC coded DAPPM (4×4 & 4×8) modulated scheme for both strong and weak turbulent free-space optical communication is proposed and its BER performance is analyzed by Monte Carlo simulation. Results prove its well reliability especially for weak turbulent channel, and calls for advanced forward error control means to deal with strong turbulent channel.
this paper proposes a new cascaded scheme for the asynchronous MIMO systems. In the scheme, the LDPC code without girth-4 and STBC code with guard intervals were employed. The cascaded code is capable to reduce the error rate and improve the performance of transmission, by taking advantage of both LDPC and STBC techniques. What's more, this paper adopted the linear dispersion structure to achieve...
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