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Optimum Pre-DFT Combining With Cyclic Delay Diversity for OFDM Based WLAN Systems

Overview The cyclic delay diversity is applied in OFDM receiver to increase the frequency-selectivity of the channel seen at the receiver for flat (or less frequency-selective) channels. The diversity combining is performed prior to the Discrete Fourier Transform (DFT) operation. A new method has been studied to optimize the Pre-DFT diversity combining by selecting the cyclic shifts and weight factors based on known channel state information. The optimum signal to noise ratio for maximum cyclic delay and optimum weight factors for multiple antenna receiver diversity is analyzed. Performance results in terms of bit error probability are presented.

Further White Paper Details
Publisher	Aalborg University	File Format	PDF
Date Published	February 2004
Format	White Papers
Topics	Wireless LAN, Mobile - Wireless Communications

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