Wireless LAN White Papers
Doppler Spread Estimation for Wireless OFDM Systems
Overview This paper presents a method for estimating the Doppler spread in mobile Orthogonal Frequency Division Multiplexing (OFDM) systems. The estimation is based on finding the autocorrelation function of time domain channel estimates over several OFDM symbols. In OFDM systems channel estimation is popularly performed in frequency domain. Channel frequency response estimates are affected by noise and Inter-Carrier Interference (ICI). As a result, Doppler estimates based on frequency domain channel estimates will be affected significantly. The paper also shows that use of channel estimates in time domain can greatly improve the performance of Doppler estimates. The Channel Impulse Response (CIR) can be obtained by taking IDFT of the Channel Frequency Response (CFR).
| Publisher | University of South Florida | File Format | |
|---|---|---|---|
| Date Published | April 2007 | Downloads | 7 |
| Format | White Papers | ||
| Topics | |||
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