A Random Access Scheme Robust to Timing Offsets for Uplink OFDMA Systems 


Vol. 33,  No. 6, pp. 659-665, Jun.  2008


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  Abstract

If ranging processes are not frequent in an uplink OFDMA system, the timing synchronization between base and mobile stations may not be maintained. Especially in the case of infrequent random accesses in a large cell, timing offsets can be considerable and the destroyed orthogonality of OFDMA signals may result in the degraded performance. This paper proposes a novel random access scheme for uplink OFDMA systems, which support the orthogonality of OFDMA signals with timing offsets by allowing a random access OFDMA symbol shorter than a normal one. In order to make uplink OFDMA systems robust to timing offsets, the proposed scheme inserts a zero-padding region in an OFDMA symbol.

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  Cite this article

[IEEE Style]

H. Song, D. Rim, B. Jeong, T. Noh, M. Rim, "A Random Access Scheme Robust to Timing Offsets for Uplink OFDMA Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 6, pp. 659-665, 2008. DOI: .

[ACM Style]

Hyunjoo Song, Dae-Woon Rim, Byung-Jang Jeong, Taegyun Noh, and Minjoong Rim. 2008. A Random Access Scheme Robust to Timing Offsets for Uplink OFDMA Systems. The Journal of Korean Institute of Communications and Information Sciences, 33, 6, (2008), 659-665. DOI: .

[KICS Style]

Hyunjoo Song, Dae-Woon Rim, Byung-Jang Jeong, Taegyun Noh, Minjoong Rim, "A Random Access Scheme Robust to Timing Offsets for Uplink OFDMA Systems," The Journal of Korean Institute of Communications and Information Sciences, vol. 33, no. 6, pp. 659-665, 6. 2008.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880