Abstract
In recent years, the constant-envelope orthogonal frequency-division multiplexing (CE-OFDM) has been considered as a candidate waveform in broadband satellite systems as it has a 0-dB peak-to-average power ratio (PAPR). However, the carrier frequency offset (CFO) estimation scheme for CE-OFDM broadband satellite systems directly affects system performance. In this paper, we analyze the network architecture and the propagation environment of CE-OFDM broadband satellite systems, and we propose a data-aided CFO estimation strategy based on the frequency domain pilot symbols. The Cramer–Rao bound (CRB) of our CFO estimator is given by mathematical analysis, and the effect of the number of pilot symbols on the estimation performance is analyzed. The pilot symbol-based CFO estimator is composed of a phase demodulator and a discrete Fourier transform (DFT) module, and it can obtain a large estimation range under a small pilot overhead. The simulation results show that the CE-OFDM broadband satellite systems can achieve a good bit error rate (BER) performance by using the proposed strategy to estimate and compensate the CFO.
Highlights
With the development of information technology, the space-air-ground integrated network (SAGIN) has received extensive attention
mean squared error (MSE) is defined as ∆ fM = F1 (∆ f − ∆ f), where F is the simulation frames per carrier-to-noise ratio (CNR)
We introduced the network architecture and the propagation environment of satellite broadband analyzed the of carrier frequency offset (CFO)
Summary
With the development of information technology, the space-air-ground integrated network (SAGIN) has received extensive attention. The most touted advantage of the SAGIN is its ability to enable communication anytime, anywhere. The space network of SAGIN is composed of various satellites and constellations (e.g., Geostationary (GEO), Medium Earth Orbit (MEO), and Low Earth. Orbit (LEO) satellites), as well as the corresponding terrestrial infrastructures (e.g., gateways and ground stations) [? ]. To support emerging applications via satellites, such as high-speed internet access and multimedia services, the high throughput broadband satellite systems have become a research hotspot [? ]. Some organizations have already carried out some MEO/LEO constellation plans, such as OneWeb and SpaceX. High operating frequency and wide bandwidth, as well as a high data rate, have become the main features of the next-generation broadband satellite systems [?
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