Dynamic precision for datapath modules

Details Dynamic precision for datapath modules Dynamic precision for datapath modules

2008-07-01

2011-11-01

Sinkantarakorn, Pao (Department: 2464)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Fourier transform

C370S208000, C375S260000

Reexamination Certificate

active

08050173

ABSTRACT:
A system and method for dynamically reducing the precision of datapath modules within an FFT unit without adversely affecting the demodulation of an orthogonal frequency division multiplexing (OFDM) signal. An FFT unit is typically implemented in an OFDM receiver to separate sub-carriers within a received OFDM signal. In general, an FFT unit implemented within an OFDM receiver must be designed to operate with a precision high enough such that quantization noise, introduced within the FFT unit, does not dominate the overall maximum SNR requirement of the system. However, the SNR requirement for many OFDM receivers is dynamic and, as a result, OFDM receivers often have an instantaneous SNR requirement far below the required maximum. In these situations, it would be advantageous to reduce the precision of datapath modules within the FFT to conserve power, which is often limited in wireless devices.

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