Title :
Research of AltBOC modulation
Author :
Changlu, Qin ; Jing, Lv ; Yangzhi, Li
Author_Institution :
Inst. of Commun. Eng., PLA Univ. of Sci. & Technol., Nanjing, China
Abstract :
When the modulation method of AltBOC was just promoted,the Galileo E5 signal´s envelope will not be constant if it brings one pilot component in upper and lower band separately. That may influence the HPA´s power efficiency. Galileo navigation system takes PRN codes to modulate new 4-level subcarriers instead of 2-level subcarriers then obtain a equivalent 8-PSK AltBOC broad band modulation. But it´s arduous to understand the complicated modulation way which multiplexes 4 navigation signal components. And the mathematical formulations are not easy to comprehend. So,in the paper,the author has researched constant envelope modulation´s characteristics and detailed 8-PSK AltBOC principles by describing phase jumping rule of the E5 signal´s Fresnel plot. Then presents how the modulation method forms a envelope constant 4-code multiplexed signal.
Keywords :
modulation; multiplexing; phase shift keying; random codes; random noise; satellite navigation; 4-code multiplexed signal; 4-level subcarrier; AltBOC modulation; Fresnel plot; Galileo E5 signal; Galileo navigation system; HPA power efficiency; PRN code; PSK broad band modulation; phase jumping rule; Amplitude modulation; Generators; Multiplexing; Navigation; Power capacitors; AltBOC; constant envelope; subcarrier;
Conference_Titel :
Communication Technology (ICCT), 2010 12th IEEE International Conference on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-6868-3
DOI :
10.1109/ICCT.2010.5688541
