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학술지 Robust OFDM-Based Synchronization Against Very High Fractional CFO and Time-Varying Fading
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저자
장갑석, 이상호
발행일
202009
출처
IEEE Systems Journal, v.14 no.3, pp.4047-4058
ISSN
1932-8184
출판사
IEEE
DOI
https://dx.doi.org/10.1109/JSYST.2020.2964816
협약과제
19HH5200, [전문연구실] 초정밀 서비스 실현을 위한 On-Time·On-Rate 무선액세스 및 광에지 클라우드 네트워킹 핵심기술 개발, 이상호
초록
This article investigates the advantages and disadvantages of cell search for LTE and NR. This investigation enables us to design a couple of synchronization signals specified in frequency domain for a whole of cell search. For time/frequency synchronization and partial cell identification, to achieve both low complexity and robustness against very high carrier frequency offset (CFO) and time-varying fading, we propose a primary synchronization signal generated by the centrally symmetric concatenation of a Zadoff-Chu sequence and its modified sequence. Also, for final cell identification, to minimize intercell interference, we propose a secondary synchronization signal constructed by element-wise exclusive-OR operation of two different cyclic-shifted m-sequences. By complexity, intercell interference analysis, and accuracy-optimized searching description, as well as cell-search evaluation, we elucidate that the proposed scheme provides many advantages, such as lower complexity, immunity toward CFO and mobility, and shorter mean cell search time directly related with latency and battery life.
키워드
Carrier frequency offset, cell search, frequency synchronization, mobility, orthogonal frequency division multiplexing (OFDM) system, time synchronization
KSP 제안 키워드
Carrier Frequency Offset, Cell identification, Cell search, Exclusive-or operation, Interference Analysis, Optimized searching, Orthogonal frequency division multiplexing (OFDM) system, Partial cell, Primary synchronization signal, Pseudo-random sequence(M-sequence), Search time