文档介绍：IMPROVEMENT OF A TIME SYNCHRONIZATION ALGORITHM FOR
IEEE WLAN STANDARD
Mª José , Vicenç Almenar, Santiago Flores, and Javier Valls
Instituto de unicaciones y Aplicaciones Multimedia, Universidad ica de Valencia
Ctra. Nazaret-Oliva s/n, 46730, Gandia, Spain
phone: + (34) 962849346, fax: + (34) 962849313, email: ******@
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ABSTRACT putational cost of every algorithm is given. Finally,
In this paper a time synchronization algorithm for IEEE in Section 6 conclusions are presented.
n1 n
OFDM-WLAN standard is evaluated and some coarse
modifications are proposed to improve its performance. The SS SS SS SS SS SS SS SS SS SS GI LS LS
original synchronization algorithm utilizes coarse and fine AGC fine and coarse channel estimation
signal detection n time synchronization n
estimation. In this paper fine time estimation is done using a i GI
cross-correlation as the original algorithm does, but differ-
Figure 1 – IEEE preamble
ent solutions are evaluated to cope with the problems of the
coarse estimation in the original algorithm. The perform-
2. TIME SYNCHRONIZATION ALGORITHM
ances of these alternatives are tested by simulation in multi-
path channels, at low signal to noise ratio and with carrier In this section the time synchronization algorithm for the
frequency offset. Also, putational cost is