Patent ID: 7990843

Claim:
An apparatus for generating a vector of digital signal samples (S), the apparatus comprising: a discrete Fourier transform (DFT) hardware module configured to receive a discrete signal of complex data symbols (C), calculate frequency responses (A 1 , . . . A M ) corresponding to tones (f (1) , . . . f (M) ), through an M-point DFT, and output a vector [A 1 , . . . A M ] of length M; a zero insertion circuit configured to expand the vector to a new vector of length N, and insert zero-value symbols corresponding to tones other than tones allocated to a transmitter; and an inverse discrete Fourier transform (IDFT) circuit configured to perform an N-point inverse discrete Fourier transform operation on the new vector after zero insertion to obtain the vector of digital signal samples (S), and to generate a low peak-to-average OFDM-based signal using the vector of digital signal samples (S) for transmission.