Device and method for performing fast fourier transform...

G - Physics – 06 – F

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G06F 17/14 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2719869

A communications device includes a signal input that receives an orthogonal frequency division multiplexed (OFDM) communications signal. A demodulator (100) is connected to the signal input for receiving the OFDM communications signal and demodulating the OFDM communication signal. It includes at least one memory element (102) for storing the at least one/cosine basis waveform approximation as complex exponential functions. A logic circuit (108) performs logical shifts in additions and multiples of +/-2n and extracts amplitude and phase values from a plurality of N data subcarriers within the OFDM communications signal. The demodulator includes efficient implementation of the FFT for use as an OFDM demodulator where the complex exponentials are approximated by multi-level complex sinusoids and optionally oversampled to increase SNR of the FFT output.

Cette invention concerne un dispositif de communication comprenant une entrée de signaux qui reçoit un signal de communications multiplexé par répartition orthogonale de la fréquence (OFDM). Un démodulateur connecté à l'entrée de signaux reçoit le signal de communications OFDM qu'il démodule. Ce démodulateur comprend au moins un élément de mémoire pour le stockage d'au moins une approximation de forme d'onde de base sinus/cosinus en tant que fonctions exponentielles complexes. Un circuit logique exécute des décalages logiques dans des additions et multiples de +/-2n et extrait des valeurs d'amplitude et de phase d'une pluralité de N sous-porteuses de données dans le signal de communications OFDM. Le démodulateur applique efficacement une transformée rapide de Fourier (FFT) comme démodulateur OFDM là où des exponentiels complexes sont déterminés approximativement par des sinusoïdes multi-niveau complexes et éventuellement suréchantillonnés pour augmenter la sortie SNR (rapport signal/bruit) ou FFT.

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