Digital modem transmitter

摘要: A data modulator for transmitting a first sequence of symbols at symbol rate 1/T, the being characterized as having carrier frequency f c Hz and denoted x(kT), where x(kT) is real or complex number k time index kth symbol, featuring, in one aspect, modulated signal generating means receiving generating, response thereto rate, second complex-valued signals y(kT), y(kT) representing y(kT)=x(kT)·exp (j2πf kT), j=√-1, filter thereto, third real-valued signals, higher than linear combinations imaginary parts y(kT).