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Use of a Variable Wordlength Technique in an OFDM Receiver to Reduce Energy Dissipation

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2 Author(s)
Yoshizawa, S. ; Grad. Sch. of Inf. Sci. & Technol., Hokkaido Univ., Sapporo ; Miyanaga, Y.

Wordlength determination is an indispensable task in digital hardware implementations of signal processing algorithms because the wordlength affects power consumption and system performance. There is a tradeoff between power consumption and system performance when searching for the optimum wordlength. We have developed a technique of dynamically controlling the wordlength used in the signal processing algorithms of wireless orthogonal frequency-division multiplexing (OFDM) receivers. The receiver dynamically changes the wordlength on the basis of the conditions in the propagation environment while satisfying the user-required communication quality. That is, the system optimizes the wordlength while operating by sensing its own performance and gradually adjusting this wordlength to improve performance. Testing revealed that, for a packet error rate (PER) of 10-2 , the application of this technique to an OFDM receiver reduces energy dissipation by 18.1%-30.2%.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:55 ,  Issue: 9 )