Sampling Rate Selection for Fractional Sampling in OFDM

Haruki NISHIMURA  Mamiko INAMORI  Yukitoshi SANADA  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.9   pp.2876-2882
Publication Date: 2008/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.9.2876
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Fundamental Theories for Communications
software defined radio,  cognitive radio,  fractional sampling,  IEEE802.11a/g,  OFDM,  multipath diversity,  

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Through fractional sampling, it is possible to separate multipath components and achieve diversity gain. However, power consumption grows as the sampling rate increases. This paper proposes a novel scheme for OFDM systems that selects the sampling rate according to the channel's frequency response. Numerical results through computer simulation show that the proposed sampling rate selection scheme reduces power consumption by reducing oversampling ratio when delay spread is small.