Title :
Variable Guard Interval Orthogonal Frequency Division Multiplexing in Dynamic Channel Condition
Author :
Das, Suvra S. ; Carvalho, E.D. ; Prasad, Ramjee
Author_Institution :
Center for TeleInFrastruktur, Aalborg Univ.
Abstract :
An algorithm for implementing variable guard interval (VGI) in orthogonal frequency division multiplexing (OFDM) based wireless networks is presented in this article. The required guard interval is derived as a function of the root mean square (rms) delay spread of the channel, time duration of discrete Fourier transform used in OFDM and the required signal to noise ration (SNR). In this work the algorithm has been verified in a highly dynamic channel condition and results show that the algorithm can reduce guard interval significantly and is also found to be robust against time variation of rms delay spread and mean excess delay of the channel
Keywords :
OFDM modulation; delays; discrete Fourier transforms; radio networks; wireless channels; OFDM; SNR; discrete Fourier transform; dynamic channel condition; mean excess delay; orthogonal frequency division multiplexing; root mean square delay spread; signal to noise ration; variable guard interval; wireless networks; Base stations; Delay effects; Discrete Fourier transforms; Frequency estimation; Frequency synchronization; Intersymbol interference; OFDM; Signal to noise ratio; Timing; Vehicle dynamics;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2006 IEEE 17th International Symposium on
Conference_Location :
Helsinki
Print_ISBN :
1-4244-0329-4
Electronic_ISBN :
1-4244-0330-8
DOI :
10.1109/PIMRC.2006.254277
