Patent ID: 8351525

Claim:
An orthogonal frequency division multiplexing (OFDM) receiving apparatus, comprising: a receiving unit, for receiving an radio frequency (RF) signal to generate a set of discrete signals; a subcarrier demodulation unit coupled to the receiving unit, for demodulating a set of real discrete signals, which are carried by different subcarrier frequencies spaced by ½T where T is a symbol interval excluding a cyclic prefix (CP), to obtain a complex signal; and a signal output processing unit coupled to the subcarrier demodulation unit, for capturing and outputting real parts of the complex signal, wherein the subcarrier demodulation unit further comprises: a complex number multiplier, receiving the discrete signal and multiplying the discrete signal with a complex coefficient, so that a frequency generates a shift; and a first and a second N-point Fourier transform unit respectively coupled to the receiving unit and the complex number multiplier, for respectively performing a demodulation to obtain a signal having a real part and an imaginary part.