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Application of DFT Spreading to OFDM Based WLAN for Energy Efficiency Improvement

Authors:
Masahiro Umehira
Takuya Nishizawa
Shigeki Takeda

Keywords: DFT spreading; OFDM; Null; DC sub-carrier; PAPR

Abstract:
This paper describes an application of Discrete Fourier Transform (DFT) spreading to Orthogonal Frequency Division Multiplexing (OFDM) based wireless LAN (WLAN) to reduce Peak to Average Power Ratio (PAPR) for energy efficiency improvement and to maintain robustness to DC offset error for cost-effective hardware implementation. We call our proposed scheme null DC sub-carrier DFT spreading OFDM, where the DC sub-carrier is made null by splitting the spectrum in the frequency domain after DFT spreading of the modulated signals. The computer simulation results confirm that BER performance is not degraded due to DC offset error at the transmitter and/or the receiver like OFDM with null DC sub-carrier and its PAPR is lower than OFDM, and is almost the same as the conventional DFT spreading OFDM.

Pages: 20 to 24

Copyright: Copyright (c) IARIA, 2013

Publication date: June 23, 2013

Published in: conference

ISSN: 2308-4030

ISBN: 978-1-61208-279-0

Location: Rome, Italy

Dates: from June 23, 2013 to June 28, 2013