载波叠加技术的频谱效率分析

Spectrum Efficiency Analysis of Carrier in Carrier Technology

卫星通信中,载波叠加技术可以通过载波间交叠的方式在同一频段实现带宽共享,理论上能大幅降低载波带宽占用和带宽租赁费用。然而转发器资源是由功率和带宽组成的,两者的占用比应遵从功带平衡原则,但载波叠加技术降低了带宽占用却没有降低功率占用,这导致了其在实际应用中受转发器功率因素限制而无法发挥其技术优势,对于载波的频谱效率提升效果在不同应用场景中也有所不同,因此有必要进行计算分析得出其实际性能水平。通过对载波叠加技术和常规卫星通信方式进行带宽、功率和信道容量三者间的关系分析、量化计算和结果对比,得出该技术的频谱效率提升性能及在不同应用场景中的实用性。

In satellite communication,carrier in carrier(CnC)technology can share the same bandwidth by overlapping multiple carriers on the same frequency band and theoretically reduce the carrier bandwidth occupation and leasing fee significantly.However,transponder resource consists of power and bandwidth,the occupation proportion of which shall follow the power&bandwidth balance principle.CnC technology saves the bandwidth occupation without reducing the power occupation,due to the transponder power limitation,the advantage of CnC technology can not be fully used in the practical application,the spectrum efficiency improvement differs in each application scenario as well.Therefore,it is necessary to calculate and analyze its actual performance.By analyzing the relationship between bandwidth,power and channel capacity,and comparing the quantitative calculation and result between CnC technology and conventional method,the spectrum efficiency improvement of CnC technology and its practicability in each application scenarios are deduced.