
By Jiadong Sun, Wenhai Jiao, Haitao Wu, Mingquan Lu
China satellite tv for pc Navigation convention (CSNC) 2014 court cases presents chosen study papers from CSNC2014, hung on 21-23 could in Nanjing, China. The topic of CSNC2014 is 'BDS software: Innovation, Integration and Sharing'. those papers talk about the applied sciences and functions of the worldwide Navigation satellite tv for pc method (GNSS) and the newest development made within the China BeiDou method (BDS) specially. they're divided into nine issues to compare the corresponding periods in CSNC2014, which extensively lined key subject matters in GNSS. Readers can know about the BDS and hold abreast of the newest advances in GNSS ideas and applications.
SUN Jiadong is the manager fashion designer of the Compass/ BDS and the Academician of chinese language Academy of Sciences (CAS); JIAO Wenhai is a researcher at China satellite tv for pc Navigation workplace; WU Haitao is a professor at Navigation Headquarters, CAS; LU Mingquan is a professor at division of digital Engineering of Tsinghua University.
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Additional resources for China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume II
Sample text
1a shows the combination efficiency of optimal solution and analytical solution versus power ratio c2. It illustrates that the difference of power between lower sideband and upper sideband is greater; the maximal combination efficiency is higher. In addition, we can find that the difference of combining efficiency between analytical solution and numerical optimal solution is less than 1 %. In this case, the complex subcarrier is the same with AltBOC modulation. Thus the generation complexity is also the same with AltBOC.
Yao Z, Lu M (2013) Constant envelope combination for components on different carrier frequencies with unequal power allocation. In: Proceedings of the 2013 international technical meeting of the institute of navigation, San Diego, pp 629–637 9. Yao Z, Lu M (2013) ACED multiplexing and its application on BeiDou B2 band. In: Proceedings of China satellite navigation conference (CSNC 2013), Lecture notes in electrical engineering, vol 244, pp 25–34 10. Zhang Kai (2013) Generalized constant-envelope dual QPSK and altBOC modulations for modern GNSS signals.
However, it is not flexible enough due to its fixed equal power allocation. For this problem, some related researches have been done. In literature [4], POCET method is proposed to combine GNSS signals at different carrier frequencies. This method is achieved by phase rotation. However, the operation to optimize the phase at each sample time is complex. Moreover, this analytical expression is difficult to obtain. Recently, time multiplex technology is integrated to AltBOC modulation. TD-AltBOC [5] and TMOC-QPSK [6] modulation are both this kind of technologies, which could simplify the generating and receiving process, and achieve similar power spectrum density and function with Galileo AltBOC modulation.