Title :
Improved algorithms for cancellation carrier optimization to suppress the OFDM OOB spectrum
Author :
Matsuura, Takayuki ; Iida, Yasutaka ; Han, Chenggao ; Hashimoto, Takeshi
Author_Institution :
Univ. of Electro-Commun., Chofu
fDate :
2/1/2009 12:00:00 AM
Abstract :
Cancellation carriers (CCs) are known to be effective for suppressing the out-of-band (OOB) spectrum of an orthogonal frequency-division multiplexing (OFDM) signal and are useful to realize OFDM-based overlay systems. We show that the known minimum-mean-square-error (MMSE) algorithm is not sufficient to reduced the OOB spectral peaks in the vicinity of transmission band boundaries compared to a direct minmax algorithm and show that a weighted MMSE (WMMSE) algorithm can attain almost the same suppression performance as the direct min-max algorithm with the same computational cost as the MMSE algorithm.
Keywords :
OFDM modulation; computer networks; least mean squares methods; optimisation; MMSE algorithm; OFDM OOB spectrum suppression; cancellation carrier optimization; minimum-mean-square-error; orthogonal frequency-division multiplexing; overlay system; Carbon capture and storage; Computational efficiency; Control systems; Filling; Frequency division multiplexing; Frequency domain analysis; Minimax techniques; OFDM modulation; Radio spectrum management; Wireless LAN; OFDM, overlay system, cancellation carrier, MMSE, min-max, OOB spectrum reduction;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2009.081652