A Multi-User Signal Processing Method for Low-Earth Orbit Satellite Communication

By constructing a combined symbol set and calculating likelihood probability, and combining Bayesian criteria and soft-input soft-output iterative detection, the demodulation accuracy and complexity issues of multi-user signal processing in low-Earth orbit satellite communication are solved, achieving efficient signal separation and bit error rate optimization.

CN119788159BActive Publication Date: 2025-10-31HUAZHONG UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411902022.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-10-31
Estimated Expiration
2044-12-23

AI Technical Summary

Technical Problem

In low-Earth orbit satellite communications, multi-user signal processing is difficult to effectively handle mixed signals with comparable power. Traditional interference cancellation methods are not applicable, and frequency reuse and precoding techniques cannot completely suppress interference. Demodulation accuracy is low and computational complexity is high.

Method used

By acquiring the pre-compensated time-domain mixed signal, constructing a combined symbol set, calculating the likelihood probability and posterior probability, and employing a soft-input soft-output iterative detection method, the error bits in the demodulation process are corrected using the Bayesian criterion and likelihood probability.

Benefits of technology

It improves the detection accuracy and efficiency of mixed signals, reduces the complexity of multi-user signal detection, and enhances demodulation bit error rate performance.

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Abstract

This invention belongs to the field of wireless communication technology, specifically relating to a multi-user signal processing method for low-Earth orbit satellite communication. The method includes: acquiring a pre-compensated digital domain hybrid signal y; arranging the standard symbol sets of N users corresponding to y into a combined symbol set of N user combined signals s according to a preset user order; iteratively calculating the likelihood probability of all possible combinations of symbols corresponding to each element in y; and calculating, in the current iteration, the transmitted signal x of user n in the hybrid signal y based on all likelihood probabilities and the prior probability of each user updated through iterative feedback. n The posterior probability of all transmitted bits being 0 is calculated; for each user's posterior probability vector obtained in the current iteration, deinterleaving and channel decoding are performed; if the iteration terminates, a decision is made and the channel-decoded probability is output; otherwise, the channel-decoded probability is used as the new prior probability for that user, and the iteration is repeated. This invention ensures demodulation bit error rate performance.
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