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- Title
低轨LTE 卫星随机接入前导设计及检测算法研究.
- Authors
丁睿; 刘召; 甄立; 秦浩
- Abstract
To deal with the wide beam coverage and large Doppler frequency shift in the Low Earth Orbit (LEO) satellite environment, this paper addresses the issue of random access preamble design and detection method for the Long Term Evolution(LTE) -based LEO satellite mobile communication systems. A Multiple Root Long Sequence(MRLS) is first presented by cascading multiple different short Zadoff-Chu (ZC) root sequences, which can support one-step timing advance estimation. Subsequently, a novel preamble detection method is proposed based on MRLS. The approach generates the multiple detection sequences by conjugated multiplication of the adjacent short ZC root sequences, and then uses the detection sequences and the pending sequences to carry out the joint differential correlation detection, so that the impact of Doppler frequency shift corresponding to the fractional and integral sub-carrier interval is effectively eliminated. Simulation results demonstrate that, by utilizing MRLS, the proposed method achieves perfect robustness to carrier frequency offset, and consequently can be adopted in LTE-based LEO satellite mobile communication systems.
- Publication
Telecommunication Engineering, 2018, Vol 58, Issue 10, p1133
- ISSN
1001-893X
- Publication type
Article
- DOI
10.3969/j.issn.1001-893x.2018.10.004