Distortionless reduction of peak power without explicit side information

Breiling, Marco; Miiller-Weinfurtner, S.H.; Huber, Johannes B.

doi:10.1109/glocom.2000.891889

Cited by 16 publications

(20 citation statements)

References 9 publications

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“…Alternatively, the effects which a non-linear device can have on the transmit power spectrum can be influenced by a reduction of the OFDM transmit signal PAR. Different techniques have been developed which reduce the PAR of the OFDM signal by the means of a modified channel coding [5], an additive [6] or multiplicative [7] correction function or a selective mapping of modulation symbols to subcarriers [8]. A majority of these techniques has a high computational complexity due to the fact that they analyze the generated transmit signal and modify it either in the frequency or time domain to reduce its peak amplitudes.…”

Section: Non-linearitiesmentioning

confidence: 99%

A low complexity transmitter structure for OFDM-FDMA uplink systems

Galda

Rohling

2002

Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)

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Abstract-The orthogonal frequency division multiplex (OFDM) transmission technique can efficiently deal with the effects of multi-path propagation in the broadband radio channel. It also has a high system inherent flexibility for designing a multiple access scheme by combining the conventional TDMA, FDMA and CDMA approaches with the OFDM modulation scheme. The FDMA multiple access scheme is especially interesting for an uplink of a communication system since it can completely avoid any multiple access interferences (MAI). Moreover, the peak-to-average ratio (PAR) of the uplink OFDM transmit signal can be greatly reduced if this OFDM-FDMA multiple access scheme is additionally combined with a data spreading technique based on a Discrete Fourier Transform (DFT) spreading matrix using only the user specific subcarriers. Since the DFT spreading operation and the IDFT operation used as a part of the OFDM modulation scheme cancel out each other the complexity of the transmitter structure for an OFDM-FDMA uplink can be greatly reduced.

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Section: Non-linearitiesmentioning

confidence: 99%

A low complexity transmitter structure for OFDM-FDMA uplink systems

Galda

Rohling

2002

Vehicular Technology Conference. IEEE 55th Vehicular Technology Conference. VTC Spring 2002 (Cat. No.02CH37367)

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“…Moreover, these algorithms require large look-up tables and, therefore, are more suitable for OFDM systems with a small number of subcarriers. A multiple signal representation approach has been proposed in [18] [19] where a set of OFDM signals are generated at the OFDM transmitter and the transmit signal with the lowest peak power is selected. This approach is computationally efficient but it requires the transmission of a small amount of side information.…”

Section: Introductionmentioning

confidence: 99%

A New Peak-to-Average Power-Ratio Reduction Algorithm for OFDM Systems via Constellation Extension

Kou

Antoniou

2007

IEEE Trans. Wireless Commun.

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Abstract-Peak-to-average power-ratio (PAPR) reduction for OFDM systems is investigated in a probabilistic framework. A new constellation extension technique is developed whereby the data for each subcarrier are represented either by points in the original constellation or by extended points. An optimal representation of the OFDM signal is achieved by using a de-randomization algorithm where the conditional probability involved is handled by using the Chernoff bound and the evaluation of the many hyperbolic cosine functions involved is replaced by a tight upper bound for these functions. The proposed algorithm can be used by itself or be combined with a selective rotation technique described in the paper and with other known algorithms such as the coordinate descent optimization and selective mapping algorithms to achieve further performance enhancements at the cost of a slight increase in the computational complexity. When compared with other existing PAPR-reduction algorithms, the enhanced algorithm offers improved PAPRreduction performance and improved computational complexity although the transmit power is increased somewhat.

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“…Moreover, these algorithms require large look-up tables and, therefore, are more suitable for OFDM systems with a small number of subcarriers. A multiple signal representation approach has been proposed in [7][8] where a set of OFDM signals are generated at the OFDM transmitter and the transmit signal with the lowest peak power is selected. This approach is computationally efficient but it requires the transmission of a small amount of side information.…”

Section: Introductionmentioning

confidence: 99%

Peak to Average Power Ratio Evaluation of OFDM System with Randomness Limiting Process

2018

IJRTER

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Abstract-Peak-to-average power-ratio reduction for OFDM systems is investigated in a probabilistic framework. A new constellation extension technique is developed whereby the data for each subcarrier are represented either by points in the original constellation or by extended points. In this paper, the analysis ofDiscrete Hartley Transform (DHT)precoded OFDM systemusing M-QAM (where M=16, 32, 64, 256) is performed. An optimal representation of the OFDM signal is achieved by using a de-randomization algorithm where the conditional probability involved is handled by using the Chernoff bound and the evaluation of the many hyperbolic cosine functions involved is replaced by a tight upper bound. The simulation results are based on DHT precoded OFDM system with DFT precoded OFDM system, Walsh Hadamard Transform (WHT) precoded OFDM system, Selected Mapping (SLM) based OFDM system and OFDM conventional. Simulation results show that the PAPR of DHT precoded OFDM system is lower than WHT precoded OFDM system, SLM-OFDM system and OFDM conventional and the work is even compared with De-randomization for number of rotation(R).

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Distortionless reduction of peak power without explicit side information

Cited by 16 publications

References 9 publications

A low complexity transmitter structure for OFDM-FDMA uplink systems

A low complexity transmitter structure for OFDM-FDMA uplink systems

A New Peak-to-Average Power-Ratio Reduction Algorithm for OFDM Systems via Constellation Extension

Peak to Average Power Ratio Evaluation of OFDM System with Randomness Limiting Process

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