Abstract
In this paper, we investigate downlink transmission schemes robust to the Doppler frequency offset (DFO) induced by high mobility for low earth orbit multiple-input and multiple-output satellite communication systems. Considering the impact of DFO, we derive the closed-form expressions for the downlink achievable rates with maximum ratio transmission (MRT) and maximum average signal-to-leakage-plus-noise ratio (MASLNR) precoding. Numerical results show that the derived closed-form expressions are accurate and the DFO severely affects system performance. In order to relieve the impact of DFO, we propose an adaptive DFO compensation algorithm based on the precompensation design and beam alignment. Numerical results verify the effectiveness of the proposed DFO compensation algorithm.
Highlights
In the 6G space-air-earth integrated network, a low earth orbit (LEO) satellite communication network will be combined with a ground communication network to provide wide coverage and high dynamic
The SE of LEO-MIMO satellite communication systems is analyzed (ii) We propose an adaptive Doppler frequency offset (DFO) compensation algorithm
In order to improve the estimation accuracy, we adopt the beam alignment (BA) algorithm for fine compensation in the receiver (iii) Simulation results verified the correctness of approximation expressions, and the average system SE can be improved after using the proposed compensation algorithm in LEO-MIMO satellite systems
Summary
The application of satellite communication has been increasing. In the 6G space-air-earth integrated network, a low earth orbit (LEO) satellite communication network will be combined with a ground communication network to provide wide coverage and high dynamic. Paper [7] discussed a maximum frequency shift estimation algorithm based on the level pass rate, which needs loss information of transmission process to calculate the average power of the signal. To achieve better performance in LEO-MIMO satellite systems, a lightweight and effective adaptive DFO compensation algorithm is needed. The SE of LEO-MIMO satellite communication systems is analyzed (ii) We propose an adaptive DFO compensation algorithm. In order to improve the estimation accuracy, we adopt the beam alignment (BA) algorithm for fine compensation in the receiver (iii) Simulation results verified the correctness of approximation expressions, and the average system SE can be improved after using the proposed compensation algorithm in LEO-MIMO satellite systems.
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call