Peak-to-average power ratio reduction in multicarrier communication systems

Arvind, M.T.

doi:10.1109/icpwc.1999.759616

Cited by 10 publications

(12 citation statements)

References 3 publications

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“…Our result is corroborated later on using simulations and is in agreement with comments made by other researchers [2], [7]. We observe here that the magnitude X E that we are trying on any subcarrier is actually predetermined in our PAPR reduction algorithms.…”

Section: Papr Optimized Location For An Alternative Symbolsupporting

confidence: 95%

“…These schemes trade off complexity, data rate, signal power, and BER to reduce the high PAPR of the transmitted OFDM signal [2]- [5]. Among all PAPR reduction schemes, probabilistic methods such as tone reservation (TR), tone injection (TI), and active constellation extension (ACE) are closest to the PAPR reduction methods developed in this paper.…”

Section: Introductionmentioning

confidence: 95%

“…However, OFDM signals exhibit high PAPR and, when passed through the non-linear -power efficient -amplifiers, they generate high levels of adjacent channel interference and inband signal distortions. The effects of nonlinearities on OFDM transmissions have been investigated in different publications using different metrics such as spectrum regrowth and bit error rate (BER) degradation [2]. There are many schemes developed to reduce the high PAPR of OFDM signals.…”

Section: Introductionmentioning

confidence: 99%

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Alternative Symbol Representations with Radial Symmetry for PAPR Reduction in OFDM Systems

Al‐Shaikhi

How

2007

2007 IEEE International Conference on Communications

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This paper proposes a new method for peak to average power ratio (PAPR) reduction in orthogonal frequency division multiplexing (OFDM) systems using two alternative signalling points to represent one symbol. In this redundant signal representation with no need for side information, the expanded constellation of signalling points used on each OFDM subcarrier is comprised of a conventional modulation scheme such as PSK or QAM and an external circle of alternative signalling points. The design of the expanded constellation maintains the minimum distance between signalling points and its advantage stems from the location of the alternative signalling point being radially symmetric to the original signalling point in the conventional constellation. Significant PAPR reduction is achieved by choosing for transmission signalling points which result in lower PAPRs. Specifically, the complementary cumulative distribution function (CCDF) of the modified OFDM signal shows about a five (5) dB improvement in PAPR at clipping probability of 10 −4 over the original OFDM signal. This performance is comparable to that in similar PAPR reduction schemes; however it is achieved at a significantly lower computational overhead.

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Section: Papr Optimized Location For An Alternative Symbolsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Alternative Symbol Representations with Radial Symmetry for PAPR Reduction in OFDM Systems

Al‐Shaikhi

How

2007

2007 IEEE International Conference on Communications

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“…But this greatly reduces the number of carriers. In [7], PAR reduction is achieved by deliberately introducing a limited number of errors to the forward-error correction (FEC) encoded input bits. This approach suffers receiver performance degradation.…”

Section: Previous Methods To Reduce Parmentioning

confidence: 99%

High peak to average ratio solution in OFDM of 4G mobile systems

Qaddour

2006

Proceedings of the 2006 International Conference on Wireless Communications and Mobile Computing

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The advent of 4G wireless systems has created many research opportunities. The expectations from 4G are high in terms of data rates, spectral efficiency, mobility and integration. Orthogonal Frequency Division Multiplexing (OFDM) is proving to be a possible multiple access technology to be used in 4G. But OFDM comes with its own challenges like high Peak to Average Ratio, linearity concerns and phase noise. This paper proposes a solution to reduce Peak to Average Ratio by clipping method. MATLAB was used to generate the OFDM signal to prove that clipping does reduce Peak to Average Ratio.

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“…Many methods for reducing the PAPR have been proposed, with clipping and filtering perhaps being the simplest approach to suppressing PAPR [2], [3]. Excessive envelope values tend to occur infrequently, allowing for amplitude clipping to constitute a reasonably effective solution.…”

Section: Introductionmentioning

confidence: 99%

Applications of Level Crossing Theory to Clipping Noise Characterization in Filtered OFDM Signals

Ilow

Venkatasubramanian

2007

2007 4th IEEE Consumer Communications and Networking Conference

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This paper applies the level crossing rate (LCR) and average fade duration (AFD) analysis to characterize clipping noise in filtered OFDM signals. Because orthogonal frequency division multiplexing (OFDM) signals exhibit complex Gaussian process behavior, well established results for the Rayleigh envelope of the correlated Gaussian process are used to derive the LCR and AFD statistics of the OFDM signal at the output of a square-root raised cosine shaping filter. The LCR and AFD information is then used to determine the statistics of the OFDM signal that passes through a soft-limiter, approximating at the baseband high power amplifier (HPA) memory-less nonlinearity. Simulation results corroborate theoretical derivations for the LCR and AFD statistics in real OFDM signals. The results obtained are important in predicting the clipping noise impact on the in-band and adjacent channel interference.

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Peak-to-average power ratio reduction in multicarrier communication systems

Cited by 10 publications

References 3 publications

Alternative Symbol Representations with Radial Symmetry for PAPR Reduction in OFDM Systems

Alternative Symbol Representations with Radial Symmetry for PAPR Reduction in OFDM Systems

High peak to average ratio solution in OFDM of 4G mobile systems

Applications of Level Crossing Theory to Clipping Noise Characterization in Filtered OFDM Signals

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