Cart (Loading....) | Create Account
Close category search window
 

The effect of filtering on the performance of OFDM systems

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Faulkner, M. ; Mobile Commun. & Signal Process. Group, Victoria Univ. of Technol., Melbourne, Vic., Australia

Filtering is required in the practical implementation of orthogonal frequency division multiplex (OFDM) systems operating at radio frequencies. These filters smear the transmitted waveform, and cause inter-symbol interference (ISI) between the blocks, forcing a further extension to the cyclic prefix. The tighter the filtering, the smaller the frequency bandwidth (guard-band) needed between adjacent channel users and the longer the prefix extension. Equations are developed that relate the prefix extension to the guard-band given the required subchannel signal-to-noise ratio (SNR). Numerical evaluation is then used to show the trade off between time domain and frequency domain capacity loss. There is an optimum guard-band loss, that will minimize the total (time+frequency) capacity loss. The total loss reduces as the inverse fast Fourier transform (IFFT) size N increases and the required SNR reduces. The capacity loss exceeds 40% when N=32 and SNR is 33 dB (needed for 8DPSK with an symbol error rate (SER) of 3% and a margin of 10 dB). Some of the loss can be reduced by using better filters (Chebyshev II), but the general trend of the results imply that schemes with a low number of subchannels (N<16) will not work well with high order modulations

Published in:

Vehicular Technology, IEEE Transactions on  (Volume:49 ,  Issue: 5 )

Date of Publication:

Sep 2000

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.