Doherty Feed-Forward Amplifier Performance Using a Novel Crest Factor Reduction Technique

Kim, Wan-Jong; Cho, Kyoung-Joon; Stapleton, S.P.; Kim, Jong‐Heon

doi:10.1109/lmwc.2006.887287

Cited by 10 publications

(5 citation statements)

References 8 publications

(6 reference statements)

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“…The CFR technique used to reduce the PAPR is based on peak cancellation [27], [28], the principle of which is based on the clipping and filtering CFR technique and carried out through two stages: hard clip and clip-and-filter.…”

Section: ) Free Parameter Of Cfrmentioning

confidence: 99%

A System Approach for Efficiency Enhancement and Linearization Technique of Dual-Input Doherty Power Amplifier

Kantana

Benosman

et al. 2023

IEEE J. Microw.

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In this paper, we propose an efficient system approach to improve the power efficiency of dual-input Doherty power amplifier (DIDPA) with maintaining its linearity level. An auto-tuning process based on a hybrid heuristic search control (HHSC) is applied to optimally define DIDPA configuration by optimizing its free parameters. Digital predistortion (DPD) is then integrated to linearize DIDPA using an optimal reduced-complexity model based on the segmentation approach. An optimal pruning process of the free parameters, based on hill-climbing (HC) heuristics, is proposed to reduce the HHSC complexity in order to refine the optimal DIDPA configuration. The system approach has been approved by experimental results, in different scenarios, using an LTE 20 MHz signal with a PAPR of 8 dB. DPD linearization under optimal DIDPA configuration improved linearity using a low-complex model with only 30 coefficients, which exhibited an error vector magnitude (EVM) of 2.5% and an adjacent channel power ratio (ACPR) of −50 dB at an averaged output power of 34 dBm. By updating the cost function coefficients and pruning the free parameters, DIDPA exhibited an EVM of 3%, an ACPR of −50 dB, and a drain efficiency of 47% at an average output power of 39 dBm.

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Section: ) Free Parameter Of Cfrmentioning

confidence: 99%

A System Approach for Efficiency Enhancement and Linearization Technique of Dual-Input Doherty Power Amplifier

Kantana

Benosman

et al. 2023

IEEE J. Microw.

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“…The complexity also depends on the number of stages, and in the proposed scheme is the same as for CPC. Figure 4 shows the FIR filter impulse response for two CA signals designed by (5).…”

Section: Fir Filter Windows Overlappingmentioning

confidence: 99%

“…To date, many CFR techniques have been developed in communication systems. In general, these techniques can be categorized as either distortion-based such as clipping and filtering [3], peak windowing (PW) [4], noise shaping (NS) [5] and conventional peak cancellation (CPC) [6] or distortion-less such as partial transmit sequence (PTS) [7] and selected mapping (SLM) [8]. The other way to categorize the CFR techniques is based on their location in the system.…”

Section: Introductionmentioning

confidence: 99%

A Crest Factor Reduction Scheme with Optimum Spacing Peak Cancellation for Intra-band Non-contiguous Carrier Aggregated OFDM Signals

Varahram

Mohammady

Farrell

et al. 2020

Wireless Pers Commun

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This paper proposes a new crest factor reduction scheme to reduce instantaneous-to-average power ratio (IAR) resulting decent peak reduction, and adjacent channel leakage ratio (ACLR) reduction, though the error vector magnitude (EVM) is significantly enhanced. In the conventional peak cancellation (CPC) technique, peak regrowth occurs as a result of finite impulse response (FIR) filter windows overlapping. The peak regrowth problem in CPC technique can be compensated, though this will lead to increased computational complexity and degradation in EVM. The proposed algorithm allocates spacing to contiguous peaks to avoid FIR filter windows overlapping. Two types of overlapping are discussed, incremental and decremental. The optimum spacing can be determined from the FIR filter impulse response characteristic. Simulations are carried out with different intra-band noncontiguous carrier aggregated OFDM signals. The results of simulations show between 3 and 10% improvement in EVM performance while maintaining equivalent IAR and ACLR performance. Applying the proposed optimum spacing peak cancellation scheme compared to the conventional peak cancellation technique.

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“…Some of the PAPR-reduction techniques for Wideband Code Division Multiple Access (WCDMA) system can be found in, for example, [7,8]. On the other hand, those for multi-carrier and OFDM signals are much more abundant and appear in many forms including selected mapping (SLM) [9] and partial transmit sequence (PTS) [10,11], just to mention a few.…”

Section: Introductionmentioning

confidence: 99%

A low-complexity peak cancellation scheme and its FPGA implementation for peak-to-average power ratio reduction

Song

Ochiai

2015

J Wireless Com Network

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The power amplifier (PA) is the most power-hungry component in a wireless base station transmitter, and reducing the peak-to-average power ratio (PAPR) of wireless signals is an important issue for its effective use. In this paper, we focus on a field-programmable gate array (FPGA) implementation of the peak cancellation (PC) technique, which is known as the simplest method for PAPR reduction. The design issue of effective peak-cancelling pulses under the constraint on the out-of-band emission is addressed. In order to reduce its hardware complexity, a novel approach for generating peak-cancelling pulses is also presented. The experimental results based on long-term evolution (LTE)/LTE-Advanced and multi-band Wideband Code Division Multiple Access (WCDMA) signals demonstrate the validity of the proposed scheme. It has been shown that the proposed PC scheme can achieve lower in-band distortion than the conventional PC with an acceptable loss in out-of-band performance. Our study also includes mapping the signal processing methods onto a Xilinx virtex-7 FPGA device running at 245.76 MHz and addresses the resource utilization and the hardware design in detail.

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Doherty Feed-Forward Amplifier Performance Using a Novel Crest Factor Reduction Technique

Cited by 10 publications

References 8 publications

A System Approach for Efficiency Enhancement and Linearization Technique of Dual-Input Doherty Power Amplifier

A System Approach for Efficiency Enhancement and Linearization Technique of Dual-Input Doherty Power Amplifier

A Crest Factor Reduction Scheme with Optimum Spacing Peak Cancellation for Intra-band Non-contiguous Carrier Aggregated OFDM Signals

A low-complexity peak cancellation scheme and its FPGA implementation for peak-to-average power ratio reduction

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