Patent ID: 8660214
Filing Date: 2014-02-25
Classification: G06F,H04L

Abstract:
1. A circuit for receiving an orthogonal frequency division multiplexing (OFDM) signal and generating a plurality of in-phase and quadrature complex Fourier coefficients comprising: an antenna configured to capture and produce an OFDM signal; a low noise amplifier (LNA) configured to receive the OFDM signal and generate an amplified OFDM signal; a filter configured to remove an OFDM image signal from the amplified OFDM signal to generate a filtered OFDM signal; a local oscillator configured to generate a local oscillator clock signal having a local oscillator frequency, the local oscillator clock frequency being equal to a difference between an intermediate frequency and an OFDM frequency of the OFDM signal; a mixer configured to frequency-shift the filtered OFDM signal to the intermediate frequency based on the local oscillator clock signal to generate a frequency-shifted OFDM signal; a sampling clock generator configured to a quadrature bandpass-sampling delta-sigma analog-to-digital demodulator (QBS-ADD) configured to a cyclic prefix removal circuit configured to a clock divider configured to a serial-to-parallel converter configured to a plurality of discrete Fourier transform (DFT) circuits, each configured to receive the M in-phase bits and the M quadrature bits, and generate an in-phase complex Fourier coefficient and a quadrature complex Fourier coefficient based at the divide-by-N frequency.