Abstract
This paper deals with the crucial issue of random access (RA) preamble design and detection for fifth generation new radio (5G NR) enabled satellite communication systems. In consideration of the characteristics of satellite environment and system compatibility, a long preamble sequence is first constructed by cascading multiple different root Zadoff-Chu (ZC) sequences with large sub-carrier interval in time domain. Then, we further present a multiple sequence joint correlation (MSJC) based one-step timing detection scheme to effectively estimate the value of timing advance (TA), which is capable of flexibly adjusting the number of available ZC sequences involved in correlation operation. The superiority of the proposed method is mathematically validated in terms of robustness to carrier frequency offset (CFO), mitigation of noise, as well as computational complexity. Numerical results in a typical low-earth-orbit (LEO) based non-terrestrial network (NTN) scenario demonstrate that the proposed method, without the pre-compensation of timing and frequency offset, can achieve a remarkable timing performance improvement in comparison with the existing methods.
Highlights
With the aim of service delivery in remote areas and improving service flexibility, it is predictable that satellite communication will become an indispensable component of the forthcoming fifth generation (5G) global networks
Though statistical analyzing the proposed method in case of a full-sequence pattern match, we have demonstrated that our method can essentially eliminate the adverse impact of carrier frequency offset (CFO) on the timing detection, and is able to obtain a much better noise-mitigation capability by increasing the available sub-sequences involved in power delay profile (PDP) calculation
It is shown that the proposed method can significantly improve the timing detection performance in terms of mean square error (MSE) and error detection probability (EDP), compared with the previous methods
Summary
With the aim of service delivery in remote areas and improving service flexibility, it is predictable that satellite communication will become an indispensable component of the forthcoming fifth generation (5G) global networks. For achieving a reliable TA estimation performance at the presence of large CFOs and low received SNRs, while considering the construction characteristics of MR-CLS, we first propose a multiple sequence joint correlation (MSJC) based timing metric for power delay profile (PDP) computation. It is worth noting that, compared with the terrestrial scenarios, the satellite communication system usually has a wider coverage range and longer propagation time delay Such that, the existing RA preamble formats cannot satisfy the access performance requirements in satellite scenarios, and TSEQ is necessary to be redesigned. ROBUST TIMING DETECTION BASED ON MR-CLS by employing the proposed long sequence MR-CLS, we focus on the design of the corresponding timing detection method from the aspects of power delay profile (PDP) calculation, correlation peak detection, and TA estimation
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