Implementation Method for Shift Orthogonal Filter in Filter-Bank Based Transmission
Bian Xi · Journal of Nanjing University of Posts and Telecommunications · 2014
A DFT-based interpolation shift orthogonal filter implementation method is proposed for the generalized multi-carrier frequency division multiple access systems based on filter bank. As the current shift orthogonal filters,such as root cosine pulse filters are mostly special designed,which are not universal. In this paper,the original low-order shift orthogonal filter is transformed from the time domain to the frequency domain by DFT. Then the interpolation is performed and is transformed back to the time domain by IDFT. Finally,a kind of high-order DFT-based interpolation filters is obtained,which keeps the shift orthogonality. Theoretical analysis and simulation results show that the proposed method is simpler and more universal,thus it is suitable for the transmission systems based on the filter bank.