Comparison of compand-filter schemes for reducing PAPR in OFDM

Chaudhary, Nadeem; Cao, Lei

doi:10.1109/wcnc.2006.1696615

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…In the companding transform scheme, a compander is used to decrease the signal amplitude, and hence it decreases the PAPR with a less computational complexity [17][18][19][20]. A compander and an expander are needed at the transmitter and receiver, respectively, leading to a slight increase in the hardware cost.…”

Section: The Companding Methodsmentioning

confidence: 99%

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An Efficient Transceiver Scheme for SC-FDMA Systems Based on Discrete Wavelet Transform and Discrete Cosine Transform

Al-Kamal

Hassan

El-Naby

et al. 2015

Wireless Pers Commun

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In this paper, the discrete cosine transform (DCT) is utilized for single carrier frequency division multiple access (SC-FDMA) transmission. Firstly, an improved DCTbased SC-FDMA (DCT SC-FDMA) system is introduced. Then, the paper presents a new transceiver architecture design for the uplink SC-FDMA system that implements a cosine basis function or a complex exponential Fourier basis function. The proposed architecture uses the discrete wavelet transform and a hybrid companding and clipping method for peak-to-average power ratio (PAPR) reduction. From the simulation results, it is shown that the DCT SC-FDMA system achieves a superior bit error rate (BER) performance than that of the discrete Fourier transform based SC-FDMA (DFT SC-FDMA) system. The results also show that the proposed wavelet based transceiver architectures for the DFT SC-FDMA system and the DCT SC-FDMA system can provide a better BER performance and a lower PAPR than the conventional DFT SC-FDMA system.

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Section: The Companding Methodsmentioning

confidence: 99%

“…In our research, compression is performed according to the well known l-law companding. The compression process can be expressed as follows [17,18]:…”

Section: The Companding Methodsmentioning

confidence: 99%

An Efficient Transceiver Scheme for SC-FDMA Systems Based on Discrete Wavelet Transform and Discrete Cosine Transform

Al-Kamal

Hassan

El-Naby

et al. 2015

Wireless Pers Commun

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“…These techniques may be applicable in SC-FDMA systems [9][10][11][12][13][14]. The clipping technique [9,13] is the simplest one that can be used in OFDM systems, but it causes additional clipping noise, which degrades the system performance.…”

Section: Introductionmentioning

confidence: 99%

“…An improved version of the clipping technique is the clipping and filtering version, which can remove the out-of-band radiation but it may cause some peak regrowth letting the signal samples to exceed the clipping level at some points [9]. The second technique is the companding technique, which was originally designed for speech processing [10][11][12][13][14]. It is the most attractive PAPR reduction technique for multicarrier transmission due to its good performance and low complexity [13].…”

Section: Introductionmentioning

confidence: 99%

“…In [13], the µ-law companding method was used whereas, in [14], the uniform companding method was used. The compression function of the uniform companding method transforms the distribution of the transmitted OFDM signals, which is assumed to be Gaussian, into a uniform distribution [12,14]. However, the compression function of the µ-law enlarges small amplitude signals [10,12].…”

Section: Introductionmentioning

confidence: 99%

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Performance enhancement of SC-FDMA systems using a companding technique

et al. 2010

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In this paper, a companding technique is proposed to effectively reduce the peak-to-average power ratio (PAPR) in single-carrier frequency division multiple access (SC-FDMA) systems. By companding the samples with large amplitudes, while enhancing those with small amplitudes, a significant reduction in the PAPR can be achieved. The performance of the proposed SC-FDMA with companding system is studied and compared with that of the standard SC-FDMA system. Simulation results show that the SC-FDMA with companding system has a lower PAPR when compared with the conventional SC-FDMA system, while the complexity of the system slightly increases. Results also reveal that the companding coefficient must be chosen carefully in order to limit the PAPR without introducing degradations into the bit error rate performance.

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