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A discrete-time (DT) fast Fourier transform (FFT) processor is presented as an architectural approach to Fourier transform processing multigigahertz of spectral bandwidth. The processor is considered with the specific application of demodulating orthogonal frequency-division multiplexing (OFDM) modulation. The processor enables increased receiver linearity beyond that which is typically limited by...
A prototype FFT processor IC that reduces linearity requirements of analog-to-digital converters in broadband orthogonal-frequency-division-multiplexing (OFDM) receivers is presented. The processor is based on a time-interleaving bank of sample-and-holds and a discrete- time analog multiplication based FFT. The circuit design of the prototype IC is presented and measurement results from the 0.13 mum...
An FFT pre-processing architecture that reduces the constraints on the analog-to-digital converter in broadband orthogonal-frequency-division-multiplexing receivers is presented. System simulations demonstrate that the proposed approach has an improved dynamic range over the conventional approach. The proposed pre-processor replaces the typically 6-bit ADC and digital FFT processor in the broadband...
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