Journal Article10.1109/JCN.2007.6182811
BER performance of OFDM combined with TDM using frequency-domain equalization
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TL;DR: It is shown that the use of frequency-domain equalization based on minimum mean square error criterion (MMSE-FDE) can significantly improve the BER performance, compared to the conventional OFDM, by exploiting the channel frequency-selectivity while reducing the PAPR or improving the robustness against long time delays.
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Abstract: Orthogonal frequency division multiplexing (OFDM) combined with time division multiplexing (TDM), in this paper called OFDM/TDM, can overcome the high peak-to-average-power ratio (PAPR) problem of the conventional OFDM and improve the robustness against long time delays. In this paper, the bit error rate (BER) performance of OFDM/TDM in a frequency-selective Rayleigh fading channel is evaluated by computer simulation. It is shown that the use of frequency-domain equalization based on minimum mean square error criterion (MMSE-FDE) can significantly improve the BER performance, compared to the conventional OFDM, by exploiting the channel frequency-selectivity while reducing the PAPR or improving the robustness against long time delays. It is also shown that the performance of OFDM/TDM de- signed to reduce the PAPR can bridge the conventional OFDM and single-carrier (SC) transmission by changing the design parameter.
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Citations
A Comprehensive Performance Comparison of OFDM/TDM Using MMSE-FDE and Conventional OFDM
Haris Gacanin,Fumiyuki Adachi +1 more
- 11 May 2008
TL;DR: The 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.
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Selective Mapping with Symbol Re-Mapping for OFDM/TDM Using MMSE-FDE
Haris Gacanin,Fumiyuki Adachi +1 more
- 24 Oct 2008
TL;DR: It is shown, by computer simulation that proposed SLM for OFDM/TDM increases the number of candidate sequences in comparison with the conventional SLM, while reducing the PAPR, which achieves a lower PAPr than the conventional OFDM with same or reduced computational complexity.
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PAPR Advantage of Amplitude Clipped OFDM/TDM
Haris Gacanin,Fumiyuki Adachi +1 more
TL;DR: It is shown that amplitude clipped OFDM/TDM has an advantage over clipped OfDM with respect to the PAPR.
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Code-Time Diversity for Direct Sequence Spread Spectrum Systems
TL;DR: A new time diversity scheme is proposed for spread spectrum systems called code-time diversity, which uses N spreading codes to transmit one data symbol over N successive symbols interval and diversity order is N multiplied by the number of the uncorrelated paths of the channel L.
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Code-Time Diversity for Direct Sequence Spread Spectrum Systems
TL;DR: A new time diversity scheme is proposed for spread spectrum systems called code-time diversity, and two demodulators structures will be proposed based on the received signal models from Rayleigh flat and frequency selective fading channels.
References
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Xiaodong Li,Leonard J. Cimini +1 more
TL;DR: This work investigates, through extensive computer simulations, the effects of clipping and filtering on the performance of OFDM, including the power spectral density, the crest factor, and the bit-error rate.
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Wireless multicarrier communications
TL;DR: This article develops a systematic discrete-time framework and designs novel systems for single- and multiuser wireless multicarrier communications-a field rich in signal processing challenges that holds great potential in various applications including audio/video broadcasting, cable television, modem design, multimedia services, mobile local area networks, and future-generation wideband cellular systems.
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Performance analysis of deliberately clipped OFDM signals
Hideki Ochiai,Hideki Imai +1 more
TL;DR: The channel capacity of the oversampled and clipped OFDM signals over the additive white Gaussian noise and ideally interleaved Rayleigh fading channels is discussed and it is shown that the SNR penalty due to the clipping can be considerably alleviated by using optimal coding and reducing the information data rate.
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Multicarrier techniques for 4G mobile communications
Shinsuke Hara,Ramjee Prasad +1 more
- 01 Jan 2003
TL;DR: In this article, the authors provide a comprehensive introduction to multicarrier techniques for 4G mobile communications with a special focus on the analytical aspects, explaining radio channel characteristics and phenomena and discussing the advantages and disadvantages of the OFDM scheme; featuring new multic-rier-related techniques, MC-CDMA, research on several 4G systems, and a look at several problems to be overcome with these systems.
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On the computation and reduction of the peak-to-average power ratio in multicarrier communications
Vahid Tarokh,Hamid Jafarkhani +1 more
TL;DR: The phase shifts offline are optimized by applying the method for computing the PAPR for the coding scenario proposed by the ETSI BRAN Standardization Committee and most of the gain is preserved when the computed optimal phase shifts are rounded to quantenary phase-shift keying (PSK), 8-PSK, and 16- PSK type phase shifts.
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