Carrier Frequency Offset Estimation for a Simple Space-Time OFDM Based Relay Networks
Date Issued
2012
Date
2012
Author(s)
Chou, Wen-Yang
Abstract
The well known advantages of orthogonal frequency division multiplexing (OFDM)
in combating inter symbol interference (ISI) and frequency selective fading channels
have led wireless relay networks to use OFDM for data transmission. However,it
is well known that OFDM systems are sensitive to carrier frequency o set(CFO).
The performance of these wireless relay networks degrades signi cantly when there is
CFO. In this thesis, we study CFO estimation for a simple Space-Time OFDM scheme
for relay networks. First, We derive an explicit expression of the correlation of the
received signals at destination node. Based on this expression, we propose a simple
preamble design for CFO estimation. The proposed preamble enables us to jointly
estimate the relay CFO and destination CFO at the destination. In other words,
the relay nodes do not need to do the complicated computation of CFO estimation.
Moreover, both ESPRIT and MUSIC algorithms are derived. As all the matrices
involved in the computation are small (3 3), the complexity of the proposed method
is low complexity. Moreover numerical simulation shows that the proposed method
has good performance and it compares favorably with existing methods.
Subjects
OFDM
CFO
relay
STBC
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
index.html
Size
23.27 KB
Format
HTML
Checksum
(MD5):d651006806e6759747302c7e0e0ca27c