Patent ID: 7916624

Claim:
An apparatus for generating a vector of digital signal samples (S), the apparatus comprising: a processor; and a memory coupled to the processor, the memory including a set of instructions stored therein and executable by the processor 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 discrete Fourier transform (DFT), and output a vector [A 1 , . . . A M ] of length M, 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, perform an N-point inverse discrete Fourier transform (IDFT) operation on the new vector after zero insertion to obtain the vector of digital signal samples (S); pre-pend a cyclic prefix to the vector of digital signal samples (S); and generate a signal representing the pre-pended vector digital signal samples (S) for transmission.