Patent ID: 6952441

Claim:
A method to determine samples of an estimated channel characteristic of a channel between a transmitter and a receiver, wherein said method comprises: generating a periodic signal of predetermined transmit pulse amplitude modulated symbols; modulating waveforms with said periodic signal of predetermined transmit pulse amplitude modulated symbols in a transmit cosine modulated filter bank in said transmitter; transferring the modulated waveforms from said transmitter to said receiver over said channel; demodulating said modulated waveforms in a cosine modulated filter bank in said receiver to recover said periodic signal of predetermined transmit pulse amplitude modulated symbols as received pulse amplitude modulated symbols; combining pairs of said received pulse amplitude modulated symbols to form received quadrature amplitude modulated symbols; and dividing said received quadrature amplitude modulated symbols by transmit quadrature amplitude modulated symbols formed by combining pairs of predetermined transmit pulse amplitude modulated symbols to thereby generate said samples of said estimated channel characteristic.