Power Amplifiers and Transmitters for Next Generation Mobile Handsets

Choi, Jinsung; Kang, Daehyun; Kim, Dong–Su; Park, Jungmin; Jin, Boshi; Kim, Bumman

doi:10.5573/jsts.2009.9.4.249

Cited by 36 publications

(9 citation statements)

References 38 publications

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“…Despite the benefits offered by the newly introduced standards, the power amplifier of the mobile terminal has to accommodate higher peak-to-average power ratios (PAPR) than prior standards, such as wideband code division multiple access (WCDMA), code division multiple access (CDMA), and enhanced data rates for GSM evolution EDGE [15]. As a result, PAPR plays an important role in the design of wireless communication systems because power amplifiers are usually operated in the linear mode rather than the saturation mode.…”

Section: Physical Layer Designmentioning

confidence: 99%

Bottom-layer solutions for 60 GHz millimeter-wave wireless networks: modulation and multiplexing access techniques

Estevez¹,

Azurdia²

2015

Telecommun Syst

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Wireless technologies are an essential communication means that transform a branched localized fixed meshwork into a ubiquitous disconnected network. A clear trend shows that cells are becoming smaller, homogeneously distributed, operating at higher carrier frequencies, and more energy conscious. This points toward wireless picocell systems that implement millimeter-wave (mm-wave) modulation. In this work various techniques are proposed, which are oriented to specific traits of the 60-GHz mm-wave band. Two techniques oriented to solve physical and data-link layer issues are proposed. Single carrier frequency division multiple access (SC-FDMA) is proposed as the technology to be implemented at the physical layer, and a variable slot time multiplexing access technique, called variable slot time-time division multiple access (VST-TDMA), with a conscious energy-conservation protocol, is proposed for the data-link (MAC) layer. SC-FDMA with pulse shaping is implemented to minimize the peak-to-average power ratio of the system, which reduces energy consumption. The multiplexing access technique takes advantage of the reduced cell size by multiplexing data in the time domain, this allows the reduced number of users to utilize the entire available bandwidth. Incorporated into the access protocol is the option of energy pacing or even self-sustainability if an energy harvesting device is present. Self-sustainability can be achieved at the cost off throughput, some techniques are discussed to relieve this trade-off condition. Also, a thorough discussion is included on battery energy depletion, even with an energy harvesting device present, to further increase the through- put performance. Since using SC-FDMA reduces the energy consumption, it enables VST-TDMA to operate at higher speeds under self-sustainability mode. Overall the proposed set of solutions showed independently significant improvements to the system. It is also discussed how these techniques coalesce conveniently by working in unison, improving the energy efficiency and throughput capabilities of 60-GHz systems.Keywords 60 GHz · Energy self-sustainability · Millimeter-wave · Peak-to-average power ratio (PAPR) · Single carrier frequency division multiple access (SC-FDMA) · Variable slot time-time division multiple access (VST-TDMA)

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Section: Physical Layer Designmentioning

confidence: 99%

Bottom-layer solutions for 60 GHz millimeter-wave wireless networks: modulation and multiplexing access techniques

Estevez¹,

Azurdia²

2015

Telecommun Syst

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“…Despite the benefits offer by the newly introduced standards, the power amplifier of the mobile terminal has to accommodate higher peak-to-average power ratios (PAPR) than prior standards, such as WCDMA, CDMA, and EDGE [1]. As a result, PAPR plays an important role in the design of wireless communication systems because power amplifiers are usually operated in the linear mode rather than the saturation mode.…”

Section: Introductionmentioning

confidence: 99%

“…This criterion guarantees that a sequence of pulses, sampled at the optimum and uniformly spaced sampling instants, will have zero intersymbol interference (ISI). According to [14], a linear combination between two pulses that comply with (1) guarantees that the resulting pulse will also be Nyquist. We considered the linear combination between the RC pulse and the PLP pulse as follows…”

Section: Nyquist Linear Combination Pulsesmentioning

confidence: 99%

“…Several power amplifier modulation technologies have the potential to work with high PAPR signals, such as Doherty amplifiers [1,4], but at the moment, these technologies are at an experimental stage. Therefore, several methods for reducing PAPR in OFDM based systems have been developed; such as probabilistic algorithms [5], non-linear expanding and compressing methods [5], and pre-coding methods [6].…”

Section: Introductionmentioning

confidence: 99%

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PAPR reduction by pulse shaping using Nyquist linear combination pulses

Azurdia-Meza

Lee

2012

IEICE Electron. Express

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Peak-to-average power ratio (PAPR) plays an important role in the design of wireless communication systems because a high PAPR decreases the efficiency of the power amplifier. A new family of Nyquist pulses was derived by applying a linear combination between two Nyquist pulses. The proposed Nyquist pulses are utilized for pulse shaping to reduce PAPR. The investigated pulses are characterized by a new design parameter (p), giving an additional degree of freedom to minimize PAPR for a given roll-off factor α. While keeping the same bandwidth, the frequency responses of the proposed filters are unique with different values of the parameter p. Simulations showed that the optimum proposed pulse shaping filters provide better performance in PAPR reduction compared to those of the RC filter and other existing filters evaluated in various systems. Keywords: Nyquist's first criterion, peak-to-average power ratio (PAPR), power amplifier Classification: Microwave and millimeter wave devices, circuits, and systems References[1] J. Choi, D. Kang, D. Kim, J. Park, B. Jin, and B. Kim, "Power Amplifiers and Transmitters for Next Generation Mobile Handsets," J. Semiconductor Technology and Science, vol. 9, no. 4, pp. 249-256, Dec. 2009. [2] H. G. Myung, J. Lim, and D. J. Goodman, "Single carrier FDMA for uplink wireless transmission," IEEE Veh. Technol. Mag., vol. 1, no. 3, pp. 30-38, Sept. 2006. [3] H. G. Myung, J. Lim, and D. J. Goodman, "Peak-to-average power ratio of single carrier FDMA with pulse shaping,"

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“…Among the various techniques for efficiency improvement, the ET technique is one of the most suitable solutions when considering both linearity and efficiency [1]. The ET technique improves the efficiency by modulating the drain voltage of the PA according to the envelope of the input signal.…”

Section: Introductionmentioning

confidence: 99%

Dual Bias Modulator for Envelope Tracking and Average Power Tracking Modes for CMOS Power Amplifier

Ham¹,

Jung²,

Bae³

et al. 2014

JSTS:Journal of Semiconductor Technology and Science

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Abstract-This paper presents a dual-mode bias modulator (BM) for complementary metal oxide semiconductor (CMOS) power amplifiers (PAs). The BM includes a hybrid buck converter and a normal buck converter for an envelope tracking (ET) mode for high output power and for an average power tracking (APT) mode for low output power, respectively. The dual-mode BM and CMOS PA are designed using a 0.18-mm CMOS process for the 1.75 GHz band. For the 16-QAM LTE signal with a peakto-average power ratio of 7.3 dB and a bandwidth of 5 MHz, the PA with the ET mode exhibited a poweradded efficiency (PAE) of 39.2%, an EVM of 4.8%, a gain of 19.0 dB, and an adjacent channel leakage power ratio of -30 dBc at an average output power of 22 dBm, while the stand-alone PA has a PAE of 8% lower at the same condition. The PA with APT mode has a PAE of 21.3%, which is an improvement of 13.4% from that of the stand-alone PA at an output power of 13 dBm.

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Power Amplifiers and Transmitters for Next Generation Mobile Handsets

Cited by 36 publications

References 38 publications

Bottom-layer solutions for 60 GHz millimeter-wave wireless networks: modulation and multiplexing access techniques

Bottom-layer solutions for 60 GHz millimeter-wave wireless networks: modulation and multiplexing access techniques

PAPR reduction by pulse shaping using Nyquist linear combination pulses

Dual Bias Modulator for Envelope Tracking and Average Power Tracking Modes for CMOS Power Amplifier

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