【摘 要】
：
Alternative binary offset carrier (AltBOC) modulated signal can combine two QPSK signals located at two close frequency bands into a constant envelope signal.An
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Alternative binary offset carrier (AltBOC) modulated signal can combine two QPSK signals located at two close frequency bands into a constant envelope signal.And it can achieve better code tracking accuracy and anti‐multipath performance,thus Galileo E5 signal uses AltBOC(15,10) modulation.However,the four signal components of AltBOC modulation have to be allocated the same power.To solve this problem,we propose a constant envelope dual‐sideband enhanced alternative BOC (DEAl‐BOC) modulation technique.In the case of not increasing signal generation complexity,DEAl‐BOC technique can adjust the power ratio of four signal component according to different requirements,and only the phase look‐up table needs to be updated.When the combined efficiency is decreased slightly,the signal generation complexity can be reduced by half.Based on DEAl‐BOC,we present the interlacing dual‐sideband enhanced alternative BOC (IDEAl‐BOC) modulation.The main advantage is that IDEAl‐BOC can improve further the combined efficiency while keeping power ratio constant,this means IDEAl‐BOC can reach higher combined efficiency than AltBOC for the case of equal power ratio.
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