Global navigation satellite systems (GNSSs) usually adopt constant-envelope multiplexing (CEM) techniques to deal with the nonlinear characteristic of high-power amplifiers (HPAs) on satellites. However, almost all the existing navigation signal CEM techniques assume that the bandwidth of the transmitter is large enough when compared to that of navigation signals, which often contradicts reality, especially for the multiplexing of wideband navigation signals such as the signals in the Galileo E5 and BDS-3 B2 bands. Consequently, the constant-envelope characteristic deteriorates severely when the composite signal passes through the filter, which leads to nonlinear distortion and low amplification efficiency. Even if the nonlinear distortion can be mitigated by using amplifier linearization techniques, the actual transmitted signal power still suffers from a high peak-to-average power ratio (PAPR) of the composite signal. In order to address this problem, we present a new band-limited, dual-frequency multiplexing technique. The main premise of this method is to consider the impact of the filter on the navigation signals at first and then introduce the band-limited auxiliary signals to reduce the peak power of the composite signal as much as possible, thereby increasing the actual transmission power of the navigation signals. Simulation results demonstrate that the proposed method has lower PAPR and higher amplification efficiency than existing methods. In addition, implementation of the proposed multiplexing technique is still based on a look-up table, which has little change compared with previous CEM methods, and the complexity of signal generation is affordable.

全球导航卫星系统（GNSS）通常采用恒定包络复用（CEM）技术来处理卫星上高功率放大器（HPA）的非线性特性。但是，几乎所有现有的导航信号CEM技术都假定发射机的带宽与导航信号的带宽相比足够大，这经常与现实相矛盾，特别是对于诸如Galileo E5和BDS-3 B2频段。因此，当复合信号通过滤波器时，恒定包络特性严重恶化，这导致非线性失真和低放大效率。即使使用放大器线性化技术可以减轻非线性失真，实际的发射信号功率仍然受到复合信号的高峰均功率比（PAPR）的影响。为了解决这个问题，我们提出了一种新的带宽受限的双频多路复用技术。这种方法的主要前提是首先考虑滤波器对导航信号的影响，然后引入带宽受限的辅助信号，以尽可能降低复合信号的峰值功率，从而增加实际的发射功率。导航信号。仿真结果表明，与现有方法相比，该方法具有较低的PAPR和较高的放大效率。此外，所提出的多路复用技术的实现仍基于查找表，与以前的CEM方法相比，该表变化不大，