Title :
Switching space-time interference cancellation for OFDM systems with unsynchronized cells
Author :
Kuzminskiy, Alexandr M. ; Abramovich, Yuri I.
Author_Institution :
Bell Labs., Swindon
Abstract :
Adaptive interference cancellation is addressed in an asynchronous orthogonal frequency-division multiplexing (OFDM) system with a frame containing a number of temporally distributed pilot symbols, e.g., as in the IEEE 802.16-2004 standard. A non-stationary symbol-by-symbol switching technique is proposed that is based on banks of the second-order statistics semi-blind solutions with on-line algorithm selection using a higher-order statistics criterion. Three banks of algorithms are formulated. Efficiency of the proposed algorithms is compared to the conventional stationary solution by means of simulations including a WIMAX (Worldwide Interoperability for Microwave Access) environment.
Keywords :
OFDM modulation; WiMax; interference suppression; statistical analysis; OFDM system; Worldwide Interoperability for Microwave Access; adaptive interference cancellation; asynchronous orthogonal frequency-division multiplexing; higher-order statistics; nonstationary symbol-by-symbol switching; second-order statistics; space-time interference cancellation; unsynchronized cells; Higher order statistics; Interference cancellation; Least squares approximation; OFDM; Radiofrequency interference; Receivers; Statistical distributions; Training data; WiMAX; Wireless communication;
Conference_Titel :
Communications, Control and Signal Processing, 2008. ISCCSP 2008. 3rd International Symposium on
Conference_Location :
St Julians
Print_ISBN :
978-1-4244-1687-5
Electronic_ISBN :
978-1-4244-1688-2
DOI :
10.1109/ISCCSP.2008.4537188
