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The Scheme for Improving the Performance of Ranging Code Detection over OFDMA Systems in Uplink  

Kim Ki-Nam (한국항공대학교 대학원 정보통신공학과)
Kim Jin-Ho (한국항공대학교 대학원 정보통신공학과)
Cho Sung-Joon (한국항공대학교 항공전자 및 정보통신공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.31, no.6A, 2006 , pp. 575-585 More about this Journal
Abstract
In Orthogonal Frequency Division Multiple Access (OFDMA) systems, timing synchronization in uplink is accomplished by an initial uplink synchronization called an initial ranging process. The Base Station's receiver synchronizes the symbol timing to specific user's symbol and the other user's symbols have some Symbol Timing Offset (STO). Linear phase shift is occurred by each user's STO in an OFDMA symbol. The Multiple Access Interference (MAI) caused by the summation of each user's linear phase shift degrades the performance of ranging code detection. In this paper, we propose an initial ranging symbol structure with common ranging code for phase shift estimation and compensation. We car estimate the average of phase shift that is generated by each user's STO and compensate this phase shift by using common ranging code. This scheme will suppress the MAI and provide better detection performance than conventional process.
Keywords
OFDMA; Uplink; Ranging Code; Detection Probability; STO;
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Times Cited By KSCI : 1  (Citation Analysis)
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