A Discrete-Time FFT Processor for Ultrawideband OFDM Wireless Transceivers: Architecture and Behavioral Modeling

作者：Lehne Mark^*; Raman Sanjay

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS, 2010, 57(11): 3011-3022.

DOI：10.1109/TCSI.2010.2050232

• Analog multipliers
• CMOS analog integrated circuits
• discrete Fourier transform
• mixed analog-digital integrated circuits
• orthogonal frequency-division multiplexing (OFDM)
• signal processing
• ultrawide bandwidth (UWB)

A discrete-time (DT) fast Fourier transform (FFT) processor which enables an architectural improvement to ultrawide-bandwidth orthogonal frequency-division multiplexing (OFDM) receivers for use in low-power handheld applications is presented. The new architecture performs FFT demodulation of the OFDM signal in the DT signaling domain before analog-to-digital conversion. The approach significantly reduces the required number of bits in the analog-to-digital converter (ADC) while increasing receiver linearity and providing improved handling of narrow-band blockers. The processor is first implemented in simulation using a top-down methodology based on behavioral models which are developed to describe the circuit functions of the DT FFT processor. System simulation results show that the processor can be implemented with DT CMOS circuits having typical nonidealities while outperforming equivalent all-digital FFT processors. An improvement in dynamic range in the FFT processor and ADC from 35 to 54 dB is demonstrated through simulation.

• 出版日期2010-11