Tunable Wordlength Architecture for a Low Power Wireless OFDM Demodulator

Shingo YOSHIZAWA; Yoshikazu MIYANAGA

doi:10.1093/ietfec/e89-a.10.2866

Tunable Wordlength Architecture for a Low Power Wireless OFDM Demodulator

Shingo YOSHIZAWA, Yoshikazu MIYANAGA

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We present a low power architecture that dynamically controls wordlengths in a wireless OFDM demodulator. Finding the optimum wordlength for digital circuit systems is difficult because the trade-off between the hardware cost and system performance is not conclusive. Actual circuit systems have large wordlengths at the circuit design level to avoid calculation errors caused by a lack of dynamic range. This indicates that power dissipation can still be reduced under better conditions. We propose a tunable wordlength architecture that dynamically changes its own wordlength according to the communication environment. The proposed OFDM demodulator measures error vector magnitudes (EVMs) from de-modulated signals and tunes the wordlength to satisfy the required quality of communication by monitoring the EVM performance. The demodulator can reduce dissipated energy by a maximum of 32 and 24% in AWGN and multipath fading channels.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E89-A No.10 pp.2866-2873

Publication Date: 2006/10/01

Publicized

Online ISSN: 1745-1337

DOI: 10.1093/ietfec/e89-a.10.2866

Type of Manuscript: PAPER

Category: VLSI Design Technology and CAD

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Shingo YOSHIZAWA, Yoshikazu MIYANAGA, "Tunable Wordlength Architecture for a Low Power Wireless OFDM Demodulator" in IEICE TRANSACTIONS on Fundamentals, vol. E89-A, no. 10, pp. 2866-2873, October 2006, doi: 10.1093/ietfec/e89-a.10.2866.
Abstract: We present a low power architecture that dynamically controls wordlengths in a wireless OFDM demodulator. Finding the optimum wordlength for digital circuit systems is difficult because the trade-off between the hardware cost and system performance is not conclusive. Actual circuit systems have large wordlengths at the circuit design level to avoid calculation errors caused by a lack of dynamic range. This indicates that power dissipation can still be reduced under better conditions. We propose a tunable wordlength architecture that dynamically changes its own wordlength according to the communication environment. The proposed OFDM demodulator measures error vector magnitudes (EVMs) from de-modulated signals and tunes the wordlength to satisfy the required quality of communication by monitoring the EVM performance. The demodulator can reduce dissipated energy by a maximum of 32 and 24% in AWGN and multipath fading channels.
URL: https://globals.ieice.org/en_transactions/fundamentals/10.1093/ietfec/e89-a.10.2866/_p

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@ARTICLE{e89-a_10_2866,
author={Shingo YOSHIZAWA, Yoshikazu MIYANAGA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Tunable Wordlength Architecture for a Low Power Wireless OFDM Demodulator},
year={2006},
volume={E89-A},
number={10},
pages={2866-2873},
abstract={We present a low power architecture that dynamically controls wordlengths in a wireless OFDM demodulator. Finding the optimum wordlength for digital circuit systems is difficult because the trade-off between the hardware cost and system performance is not conclusive. Actual circuit systems have large wordlengths at the circuit design level to avoid calculation errors caused by a lack of dynamic range. This indicates that power dissipation can still be reduced under better conditions. We propose a tunable wordlength architecture that dynamically changes its own wordlength according to the communication environment. The proposed OFDM demodulator measures error vector magnitudes (EVMs) from de-modulated signals and tunes the wordlength to satisfy the required quality of communication by monitoring the EVM performance. The demodulator can reduce dissipated energy by a maximum of 32 and 24% in AWGN and multipath fading channels.},
keywords={},
doi={10.1093/ietfec/e89-a.10.2866},
ISSN={1745-1337},
month={October},}

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TY - JOUR
TI - Tunable Wordlength Architecture for a Low Power Wireless OFDM Demodulator
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 2866
EP - 2873
AU - Shingo YOSHIZAWA
AU - Yoshikazu MIYANAGA
PY - 2006
DO - 10.1093/ietfec/e89-a.10.2866
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E89-A
IS - 10
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - October 2006
AB - We present a low power architecture that dynamically controls wordlengths in a wireless OFDM demodulator. Finding the optimum wordlength for digital circuit systems is difficult because the trade-off between the hardware cost and system performance is not conclusive. Actual circuit systems have large wordlengths at the circuit design level to avoid calculation errors caused by a lack of dynamic range. This indicates that power dissipation can still be reduced under better conditions. We propose a tunable wordlength architecture that dynamically changes its own wordlength according to the communication environment. The proposed OFDM demodulator measures error vector magnitudes (EVMs) from de-modulated signals and tunes the wordlength to satisfy the required quality of communication by monitoring the EVM performance. The demodulator can reduce dissipated energy by a maximum of 32 and 24% in AWGN and multipath fading channels.
ER -