Time-domain interpolated channel estimation with noise suppression for multicarrier transmissions

The accuracy of channel estimation has a great impact on the system throughput of multicarrier transmissions. Two novel time-domain interpolated channel estimation schemes are proposed. Channel estimates in the frequency domain are transformed into the time domain and a threshold on either actual power or accumulative power is applied to minimize the noise jitter over the whole bandwidth. Then, the noise suppressed channel estimates are transformed back into the frequency domain by FFT interpolation for channel equalization. The numerical results show that the proposed algorithms can considerably improve the system throughput over conventional schemes.