DocumentCode :
3503172
Title :
A Comprehensive Performance Comparison of OFDM/TDM Using MMSE-FDE and Conventional OFDM
Author :
Gacanin, Haris ; Adachi, Fumiyuki
Author_Institution :
Dept. of Electr. & Commun. Eng., Tohoku Univ., Sendai
fYear :
2008
fDate :
11-14 May 2008
Firstpage :
1404
Lastpage :
1408
Abstract :
Orthogonal frequency division multiplexing (OFDM) is currently under intense research for broadband wireless transmission due to its robustness against multipath fading. However, OFDM signals have a problem with high peak-to-average power ratio (PAPR) and thus, a power amplifier must be carefully manufactured to have a linear input-output characteristic or to have a large input power backoff. Recently, OFDM combined with time division multiplexing (OFDM/TDM) using minimum mean square error frequency domain equalization (MMSE-FDE) was proposed to improve the bit error rate (BER) performance of conventional OFDM while reducing the PAPR. In this paper, by extensive computer simulation, we present a comprehensive performance comparison between OFDM/TDM using MMSE-FDE and conventional OFDM over a frequency-selective fading channel. We discuss about the trade-off among the transmit peak-power efficiency, the spectrum splatter and the BER performance. Our results show that OFDM/TDM using MMSE-FDE achieves almost the same coded BER performance with a several decibels better peak-power efficiency than conventional OFDM, which is significant reduction of amplifier transmit-power backoff, but with a slight decrease in spectrum efficiency.
Keywords :
OFDM modulation; equalisers; error statistics; fading channels; frequency-domain analysis; mean square error methods; time division multiplexing; BER performance; MMSE-FDE; OFDM/TDM; amplifier transmit-power backoff; broadband wireless transmission; frequency-selective fading channel; linear input-output characteristic; peak-to-average power ratio; Bit error rate; Broadband amplifiers; Fading; High power amplifiers; Manufacturing; Mean square error methods; OFDM; Peak to average power ratio; Robustness; Time division multiplexing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Vehicular Technology Conference, 2008. VTC Spring 2008. IEEE
Conference_Location :
Singapore
ISSN :
1550-2252
Print_ISBN :
978-1-4244-1644-8
Electronic_ISBN :
1550-2252
Type :
conf
DOI :
10.1109/VETECS.2008.295
Filename :
4525851
Link To Document :
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