Frequency synchronization algorithms for 802.11n based mimo-ofdm systems: a performance analysis
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Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
IEEE
Abstract
Orthogonal Frequency Division Multiplexing
(OFDM) is a bandwidth efficient signaling scheme for digital
communications that was first proposed by Chang. In OFDM,
the spectrum of individual orthogonal subcarriers mutually
overlaps, giving therefore an optimum spectrum efficiency. A
data communications system based on OFDM is particularly
sensitive to frequency offset in the channel. Frequency offset is
a phenomena, which causes phase shift and hence, reduction in
signal strength at the output of the filters matched to each of the
carriers and introduces ICI from other carriers which are now
no longer orthogonal to the filter. In OFDM the carriers are
inherently closely spaced in frequency compared to the channel
bandwidth, the tolerable frequency offset becomes a very small
fraction of the channel bandwidth. This paper is based on the
study and comparison of algorithms that estimate the carrier
and sampling frequency offsets from the demodulated data
signals in the receiver. An implementation of these techniques
to correct the respective offsets along with the performance of
these algorithms, via simulation, is also presented.
Description
Keywords
Orthogonal Frequency Division Multiplexing, Multiple Input-Multiple Output Systems, Carrier Frequency Offset, Frequency Synchronization
Citation
IEEE/IAPR International Conference on Informatics, Electronics & Vision (ICIEV), 2012