Adaptive channel equalizer with frequency sampling filter
Tetsurou Fujii, Hiroshi Harashima, Hiroshi Miyakawa · Electronics and Communications in Japan (Part I Communications) · 1982
Abstract This paper proposes a new method of circuit construction for the adaptive channel equalizer using frequency sampling filter, together with the result of analysis of its characteristics. In the proposed method, the discrete Fourier transform is applied successively to the received signal and, by adjusting the tap coefficients according to the energy in each DFT coefficient, high‐speed convergence is realized. A discrete Fourier transform using a frequency sampling filter is adopted in the proposed system, whereby an adaptive equalizer with arbitrary number of taps can easily be constructed. From the result obtained by using a simulated sequence, it is seen that the proposed system has the same order of convergence speed with approximately half the number of multiplications and divisions required with the lattice‐type adaptive equalizer. A parallel construction is possible for the adaptive channel equalizer with frequency sampling filter and the method is applicable to existing equipment.