Patent ID: 7130345
Filing Date: 2006-10-31
Classification: H04L

Abstract:
1. A configurable equalization apparatus for providing equalization topologies for single path, dual path , oversampled and double rate for multicarrier communications comprising: selectable routing circuitry for multiple equalization topologies; selectable delay that is selectable between 0, 1, M/2 and M samples; two down sampling by 2 circuits(d a summing circuit; two time domain equalizers (TEQs) of selectable lengths of M/2 and M; two N point Fast Fourier Transforms (FFTs); and a 2N point FFT; said selectable routing circuitry, said selectable delay and said TEQs being in a first selectable routing position and delay position providing a single path equalization provided by the selectable delay being at M samples, TEQs at length M and the outputs of the TEQs being summed at the summer circuit and applied to one N point FFT, said selectable routing circuitry, said selectable delay and said TEQs being in a second position such that a dual path equalization is provided by the delay being at 0, the TEQs at length M and a first of the TEQs applied to a first of the FFTs and a second of the TEQs applied to the a second of the FFTs, said selectable routing circuitry, said selectable delay and said TEQs being in a third position for oversampled equalization with a one sample delay between the two down sampling by 2 with a first of the down sampling by 2 applied to a first of the TEQs at delay M samples and a second of down sampling by 2 applied to the second of the TEQs at delay M samples and the outputs of the TEQs summed at the summing circuit and the sum applied to one of said N point FFTs, and said selectable routing circuitry, said selectable delay and said TEQs being in a fourth position for double rate equalization by the delay between the input to the TEQs being at length M/2, the TEQs at length M/2 and the outputs of the TEQs being summed at the summer circuit with the summed output alternately applied to the two N point FFTs and even sample outputs from the one of the two N point FFTs being applied to said 2N point FFT and odd sample outputs from the other of said two N point FFTs being applied to said 2N point FFT and the samples combined at the 2N point FFT.