Synchronization and AGC proposal for IEEE 802.11 a burst OFDM systems

Author

Fort, Andrew ; Eberle, Wolfgang

Author_Institution

IMEC, Leuven, Belgium

Volume

3

fYear

2003

fDate

1-5 Dec. 2003

Firstpage

1335

Abstract

Synchronization is critical in the design of an OFDM receiver. Large timing offsets result in a loss of orthogonality between subcarriers, ISI, and severe bit error degradation. To minimize this degradation, standards incorporate preambles intended for all OFDM acquisition functions including automatic gain control (AGC) and synchronization. Several synchronization algorithms have been proposed. Unfortunately, these proposals do not take into account AGC effects which degrade results in practice. To address this problem, we have built an FPGA implementation of both an AGC and synchronization system. Based on these results, in this paper we propose a novel standard compliant auto-correlation synchronization algorithm and AGC interface, then measure the total system performance.

Keywords

OFDM modulation; automatic gain control; field programmable gate arrays; radio receivers; synchronisation; wireless LAN; AGC interface; FPGA implementation; IEEE 802.11; burst OFDM systems; standard compliant auto-correlation synchronization algorithm; Autocorrelation; Degradation; Field programmable gate arrays; Gain control; Intersymbol interference; Measurement standards; OFDM; Proposals; System performance; Timing;

fLanguage

English

Publisher

ieee

Conference_Titel

Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE

Print_ISBN

0-7803-7974-8

Type

conf

DOI

10.1109/GLOCOM.2003.1258455

Filename

1258455