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A Random Access Scheme Robust to Timing Offsets for Uplink OFDMA Systems
Minjoong RIM
Publication
IEICE TRANSACTIONS on Communications
Vol.E92-B
No.10
pp.3274-3276 Publication Date: 2009/10/01 Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.3274 Print ISSN: 0916-8516 Type of Manuscript: LETTER Category: Wireless Communication Technologies Keyword: random access, OFDMA, uplink, timing offset, zero-padding,
Full Text: PDF>>
Summary:
If ranging processes are not frequent in an uplink OFDMA system, timing synchronization between the base and mobile stations may not be maintained and the performance may be degraded. This paper proposes a random access scheme in which a short OFDMA symbol is transmitted to maintain the orthogonality with timing offsets. A short symbol is constructed by inserting zero-padding to an OFDMA symbol.
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