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

Minjoong RIM  

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
random access,  OFDMA,  uplink,  timing offset,  zero-padding,  

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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.