Coarse Grained ADRES Based MIMO-OFDM Transceiver with New Radix- $${2}^{5}$$ 2 5 Pipeline FFT/IFFT Processor

Janakiraman, N.; Nirmalkumar, P.; Akram, Syed Mohsin

doi:10.1007/s00034-014-9880-8

Cited by 6 publications

(1 citation statement)

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“…In the other two, the fully-parallel architecture does not provide any flexibility at all and the pipeline architecture supports only a low degree of reconfigurability on the FFT size. Although some designs are developed for reconfigurable pipeline FFT processors [44,51,48,10,24], their flexibilities are limited only to very few FFT sizes and as a result, the hardware overhead incurred by the reconfigurability is not tolerable for low-power schemes.…”

Section: Overall Structurementioning

confidence: 99%

Improving Energy Efficiency of OFDM Using Adaptive Precision Reconfigurable FFT

Abdoli

Nikmehr

Movahedinia

et al. 2016

Circuits Syst Signal Process

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Being an essential issue in digital systems, especially battery-powered devices, energy efficiency has been the subject of intensive research. In this research, a multi-precision FFT module with dynamic runtime reconfigurability is proposed to trade off accuracy with the energy efficiency of OFDM in an SDR-based architecture. To support variable size FFT, a reconfigurable memory-based architecture is investigated. It is revealed that the radix-4 FFT has the minimum computational complexity in this architecture. Regarding implementation constraints such as fixed-width memory, a noise model is exploited to statistically analyze the proposed architecture. The required FFT word-lengths for different criteria-namely BER, modulation scheme, FFT size, and SNR-are computed analytically and confirmed by simulations in AWGN and Rayleigh fading channels. At run-time, the most energyefficient word-length is chosen and the FFT is reconfigured while the required application-specific BER is met. Evaluations show that the implementation area and the number of memory accesses are reduced. The results obtained

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Section: Overall Structurementioning

confidence: 99%