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- W2801667911 abstract "More and more signals are broadcast by navigation satellite systems nowadays to satisfy users’ diversified needs in positioning, navigation and timing (PNT). We usually adopt multiplexing techniques to combine several signals into an integrated signal to save transmission link resources. Since the high-power amplifier on satellite operates at the nonlinear saturation region, the multiplexed signal is required to have constant-envelope characteristic. At present, single frequency constant-envelope multiplexing (CEM) techniques have been studied thoroughly. However, the research in multi-frequency constant-envelope multiplexing still needs to be strengthened. In this paper, we propose a subcarrier-abstracted multi-frequency constant-envelope multiplexing (SAMCEM) technique. We substitute the continuous sinusoidal subcarrier by step-shape subcarrier, and construct the signal space using the view of orthogonality. Based on these mathematical preliminaries, we set up an optimization problem, which maximizes multiplexing efficiency under the constraint of constant envelope. The output of our method is a phase look-up table (LUT). Our method breaks the limitations in subcarriers, the number of signals, and power and phase relationship among signals, overcoming drawbacks of the existing multi-frequency multiplexing techniques with better flexibility and universality and can achieve optimal multiplexing efficiency. This technique serves as a candidate technique to support the improvement in signal scheme of BDS III. In this paper, we also improve the engineering implementation of multi-frequency CEM. A low-redundancy LUT storage scheme is proposed, which can save half of the storage resource in dual-frequency multiplexing. Besides, pipeline structure is adopted to generate multi-frequency CEM signals, which can help avoid transmitted phase error in multi-frequency CEM." @default.
- W2801667911 created "2018-05-17" @default.
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- W2801667911 date "2018-01-01" @default.
- W2801667911 modified "2023-09-27" @default.
- W2801667911 title "Subcarrier-Abstracted Multi-frequency Constant-Envelope Multiplexing and Its Implementation Optimization" @default.
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- W2801667911 doi "https://doi.org/10.1007/978-981-13-0014-1_14" @default.
- W2801667911 hasPublicationYear "2018" @default.
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