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


Vol. 31,  No. 6, pp. 575-585, Jun.  2006


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  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 can 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.

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  Cite this article

[IEEE Style]

K. Kim, J. Kim, S. Cho, "The Scheme for Improving the Performance of Ranging Code Detection over OFDMA Systems in Uplink," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 6, pp. 575-585, 2006. DOI: .

[ACM Style]

Ki-nam Kim, Jin-ho Kim, and Sung-joon Cho. 2006. The Scheme for Improving the Performance of Ranging Code Detection over OFDMA Systems in Uplink. The Journal of Korean Institute of Communications and Information Sciences, 31, 6, (2006), 575-585. DOI: .

[KICS Style]

Ki-nam Kim, Jin-ho Kim, Sung-joon Cho, "The Scheme for Improving the Performance of Ranging Code Detection over OFDMA Systems in Uplink," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 6, pp. 575-585, 6. 2006.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880