Adaptive Digital Predistortion for Power Amplifiers Used in CDMA Applications

Varahman, P.; Atlasbaf, Zahra; Heydarian, N.V.

doi:10.1109/apace.2005.1607810

Cited by 12 publications

(10 citation statements)

References 7 publications

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“…The linearization technique, called complex gain predistortion (CGP), is a combination of two techniques, a gainbased predistorter proposed in [16] and a memory polynomial model in [15]. The linearization technique, called complex gain predistortion (CGP), is a combination of two techniques, a gainbased predistorter proposed in [16] and a memory polynomial model in [15].…”

Section: Dsi-slm With Complex Gain Predistortionmentioning

confidence: 99%

“…It can be observed in Figure 1 that the scattering of the Amplitude to Amplitude Modulation (AM-AM) and Amplitude to Phase Modulation (AM-PM) samples is due to memory effects. A nonlinear PA with memory effects can be approximated by the Volterra series [15].…”

Section: Definitionsmentioning

confidence: 99%

“…There are many linearization techniques, such as feed forward, Cartesian feedback, and digital predistortion (DPD). The thermal memory effect of the PA is also considered in this technique [12][13][14][15]. The DPD method in multicarrier systems is less effective than in single carrier systems.…”

Section: Introductionmentioning

confidence: 99%

“…The CGP method linearizes the PA by introducing an inverse transfer function into the input signal before passing through the PA. The thermal memory effect of the PA is also considered in this technique [12][13][14][15]. This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A low complexity selected mapping scheme for peak to average power ratio reduction with digital predistortion in OFDM systems

Mohammady

Sidek

Varahram

et al. 2011

Int J Communication

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One of the effective methods used for reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems is selected mapping (SLM). In this paper, a new SLM scheme called DSI-SLM, which is a combination of dummy sequence insertion (DSI) and conventional selected mapping (C-SLM) is proposed. Previous techniques have had some drawbacks. In DSI, increasing the number of dummy sequences to have better PAPR degrades transmission efficiency, and in C-SLM, the complexity rises dramatically when the number of sub-blocks increases. The proposed DSI-SLM scheme significantly reduces the complexity because of the reduction in the number of sub-blocks compared with the C-SLM technique while its PAPR performance is even better. To enhance the efficiency of the OFDM system and suppress the out-of-band distortion from the power amplifier nonlinearity, a digital predistortion technique is applied to the DSI-SLM scheme. Simulations are carried out with the actual power amplifier model and the OFDM signal based on the worldwide interoperability for microwave access standard and quadrature phaseshift keying modulation. The simulation results show improvement in PAPR reduction and complexity, whereas the BER performance is slightly worse.

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Section: Dsi-slm With Complex Gain Predistortionmentioning

confidence: 99%

Section: Definitionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A low complexity selected mapping scheme for peak to average power ratio reduction with digital predistortion in OFDM systems

Mohammady

Sidek

Varahram

et al. 2011

Int J Communication

Self Cite

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“…An adaptive digital predistorter was presented for linearizing a PA, but only 20 dB improvement was noticed and again the solution was only applicable to narrowband signals [8]. A wideband adaptive DPD technique using the concept of the combination of a memory polynomial predistorter and a slope-dependent method was proposed in [9], but the proposed method was complex to implement.…”

Section: Introductionmentioning

confidence: 99%

Application of singular value decomposition algorithm for implementing power amplifier linearizer

Kaur¹,

Patterh²

2017

Turk J Elec Eng & Comp Sci

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Abstract:A power amplifier (PA) is an integral component of all base stations in wireless communication systems and is used for converting DC power supply into radio frequency output power, but PAs are highly nonlinear. To achieve high power conversion efficiency, the PA is operated near saturation, which causes intermodulation products and hence results in nonlinear distortion. Digital predistortion (DPD) is a technique used to compensate for the nonlinear distortion without compromising its efficiency. Fourth Generation Long Term Evolution (4G LTE) systems use a carrier aggregation scheme to combine separate available bandwidths to deliver high data speeds. In this paper the DPD technique has been applied to the 4G LTE downlink system using the singular value decomposition (SVD) algorithm. The 4G LTE downlink communication system has been developed for two 10 MHZ carriers aggregated together and the performance of the SVD algorithm has been evaluated in terms of AM-AM characteristics and power spectral density.

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A Low Complexity Peak-to-Average Power Ratio Reduction Scheme Using Gray Codes

Kazemian

Varahram

Hashim

et al. 2015

Wireless Pers Commun

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A low-complexity peak-to-average power ratio (PAPR) reduction scheme in an orthogonal frequency division multiplexing system is proposed. The proposed scheme utilizes a new phase sequence based on a gray code structure and a similarity measurement block. Due to the ordered phase sequences, a noteworthy reduction capacity is obtained in terms of the number of multiplication and addition operations and the side information. Simulations are performed with quadrature phase shift keying modulation and a Saleh model power amplifier. The proposed scheme offers a significant PAPR reduction and bit error rate performance at approximately the same total complexity compared to the conventional partial transmit sequence and the enhanced partial transmit sequence (EPTS) techniques. The results show that at the same PAPR reduction, this scheme provides a complexity reduction of at least 42.3 % over that of the EPTS technique.

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Adaptive Digital Predistortion for Power Amplifiers Used in CDMA Applications

Cited by 12 publications

References 7 publications

A low complexity selected mapping scheme for peak to average power ratio reduction with digital predistortion in OFDM systems

A low complexity selected mapping scheme for peak to average power ratio reduction with digital predistortion in OFDM systems

Application of singular value decomposition algorithm for implementing power amplifier linearizer

A Low Complexity Peak-to-Average Power Ratio Reduction Scheme Using Gray Codes

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