Dynamic precision scaling for low power WCDMA receiver
Hai-Nam Nguyen, Daniel Ménard, Olivier Sentieys · 2009
One of the most important applications of digital signal processing (DSP) is wireless communication. This kind of application requires low power implementation of DSP, which generally uses fixed-point arithmetic. The fixed-point architectures should be developed to maintain the energy consumption power at a reasonable level. In this paper, an approach which adapts the fixed-point specification according to the input receiver signal-to-noise ratio (SNR) is proposed. To underline our approach interest, the rake receiver of a WCDMA receiver is examined. Results show about 25% - 40% energy savings with our dynamic precision approach.