Title :
On carrier nulling approaches for channel shortening in OFDMA systems
Author :
Miyajima, Teruyuki ; Ding, Zhi
Author_Institution :
Dept. of Electr. & Electron. Eng., Ibaraki Univ., Hitachi, Japan
Abstract :
This paper considers blind and semiblind channel shortening methods based on carrier nulling criteria to mitigate the effect of inter-block interference in uplink OFDMA systems. We derive a sufficient condition that states that if the number of subcarriers unused by a desired user exceeds a given threshold then uplink channels can be shortened perfectly. Simulation results are shown to verify the analytical result.
Keywords :
OFDM modulation; frequency division multiple access; telecommunication channels; OFDMA systems; inter-block interference; semiblind channel shortening methods; uplink channels; Cost function; Discrete Fourier transforms; Eigenvalues and eigenfunctions; Interference; OFDM; Receivers; Signal to noise ratio;
Conference_Titel :
Signal Processing Advances in Wireless Communications (SPAWC), 2010 IEEE Eleventh International Workshop on
Conference_Location :
Marrakech
Print_ISBN :
978-1-4244-6990-1
Electronic_ISBN :
1948-3244
DOI :
10.1109/SPAWC.2010.5670878
