| Citation: | XU K D，XU Z B，GUO X X，et al. Analysis of CDMA interference in large-scale satellite constellation[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（9）：2885-2892 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0741
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Code division multiple access (CDMA) communication system is the main part of large-scale satellite constellation network. In the case of multiple access interference in multi-channel communication between satellites, the receiving link is modeled. This study elucidates the correlation between bit energy to noise density ratio (BENR) and device received signal-to-noise ratio (SNR), while also investigating the impacts of additive white noise and multiple access interference on SNR. The BENR and sensitivity are simulated in MATLAB with different receiving and interference power. The simulation demonstrates that the interference signal exerts a diminished impact on the sensitivity when the signal-to-interference ratio (SIR) exceeds 0 dB. The receiver can withstand −6 dB interference while maintaining high sensitivity. An experimental platform for three transmitters and one receiver is established. Data is processed by Chipscope and MATLAB software to obtain the received sensitivity that meets the actual application requirements. Experiments show that when SIR is greater than 0 dB, the received sensitivity can reach −107 dBm. The receiver can resist −9 dB interference at high sensitivity. Error is affected by circuit noise. The congruence between the measured data and the theoretical analysis provides a fundamental basis for the development of the real low-orbit satellite constellation network.
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