Synchronization in OFDM-based WLAN with Transmit and Receive Diversities

Conference: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
09/11/2005 - 09/14/2005 at Berlin, Germany

Proceedings: PIMRC 2005

Pages: 5Language: englishTyp: PDF

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Liang, Ting-Jung; Li, Xin; Irmer, Ralf; Fettweis, Gerhard (Vodafone Chair Mobile Communications Systems, Dresden University of Technology, 01062 Dresden, Germany)

This paper deals with the feasibility of improving synchronization (packet detection and frequency synchronization) of OFDM systems by exploiting transmit and receive diversities. Starting from a performance analysis of SISO synchronization, SIMO, MISO and MIMO synchronization algorithms are proposed and analyzed step by step. Simulations for IEEE 802.11a/g/n-like systems in frequency-selective channels show that the performance of packet detection can be improved by 6.5 dB and the residual frequency synchronization error can be reduced by 68.7%, if 4 transmit antennas and 4 receive antennas are used. For that, carefully designed training sequences and respective transmitter and receiver algorithms are necessary.