Patent ID: 7881398

Claim:
An apparatus for transmitting data in an orthogonal frequency division multiplex (OFDM) system operating in accordance with an FFT numerology and having one or more channels each having a corresponding transmission bandwidth, the apparatus comprising: an inverse fast Fourier transform (IFFT) processor configured to apply, at an FFT sampling rate, an inverse of an N-point FFT algorithm to one or more data tones in combination with one or more reference pilot tones to generate a time-domain sample sequence; and a digital-to-analog converter (DAC) configured to convert, at the FFT sampling rate, the time-domain sample sequence to an analog time-domain signal for modulation, wherein the FFT numerology defines: i) N as an integer representing a size of the N-point FFT algorithm determined by the FFT sampling rate, wherein a value for N is defined for each transmission bandwidth, and ii) the FFT sampling rate based upon a rational multiple of a base clock signal of the OFDM system so as to be less than 1.2 times the corresponding transmission bandwidth.