Title :
Sub-channel equalizer design based on geometric interpolation for FBMC/OQAM systems
Author :
Rocha, Carlos Aurélio Faria da ; Bellanger, Maurice G.
Author_Institution :
GPqCom, Fed. Univ. of Santa Catarina, Florianopolis, Brazil
Abstract :
The interpolation of complex signals is frequently encountered in the signal processing chains of high performance transmission systems. Linear interpolation might be inappropriate for this kind of situation and, here, geometric interpolation is proposed instead. Specifically, it is proposed, in a Filter Bank-based Multi-Carrier/Offset QAM (FBMC/OQAM) transmission system, to use geometric interpolation to determine the frequency domain intermediate points of each sub-channel needed to calculate the T/2-spaced sub-channel equalizer coefficients at the beginning of the burst. The equalizer coefficients are computed using the inverse fast Fourier transform (IFFT). This equalizer must compensate ISI and ICI caused by a selective channel and timing offset. Simulation results demonstrate the effectiveness of the proposed equalizer.
Keywords :
adjacent channel interference; channel bank filters; equalisers; fast Fourier transforms; frequency-domain analysis; interference suppression; interpolation; inverse transforms; quadrature amplitude modulation; FBMC; ICI; ISI compensation; OQAM systems; equalizer coefficients; filter bank based multicarrier; frequency domain analysis; geometric interpolation; inverse fast Fourier transform; linear interpolation; offset QAM; signal processing; signal transmission; sub-channel equalizer design; Delay; Equalizers; Filter banks; Finite impulse response filter; Interpolation; OFDM;
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
DOI :
10.1109/ISCAS.2011.5937804
