A CMOS Low-Power Digital Polar Modulator System Integration for WCDMA Transmitter

Jung, In-Seok; Kim, Yong-Bin

doi:10.1109/tie.2011.2158777

Cited by 8 publications

(5 citation statements)

References 25 publications

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“…where r (a) k denotes again the decomposed kth-order conventional memoryless nonlinearity coefficients same as that in (11) and (12) (with the same nonlinearity order K a ) and d m denotes the coefficients of the third-order Volterra filter. M d is the memory depth of the filter.…”

Section: Acr-gmp Modelmentioning

confidence: 99%

“…A S IS widely known, power amplifiers (PAs) are the major source of nonlinear distortion and are also the most power consuming devices in numerous industrial electronic applications [1]- [11], e.g., in magnetic bearing [1]- [3], digital video broadcasting [4], radio frequency (RF) transceivers [5]- [8], and dual-band/wideband wireless communications [9], [10]. Specifically, in wireless communications, to enhance the spectral efficiency in modern high-speed wireless communication systems, different nonconstant envelope modulation schemes, such as wideband code division multiple access (WCDMA) [11] in third generation (3G) mobile networks and orthogonal frequency division multiple access in 3rd Generation Partnership Project (3GPP) long-term evolution (LTE), are normally employed.…”

Section: Introductionmentioning

confidence: 99%

“…Specifically, in wireless communications, to enhance the spectral efficiency in modern high-speed wireless communication systems, different nonconstant envelope modulation schemes, such as wideband code division multiple access (WCDMA) [11] in third generation (3G) mobile networks and orthogonal frequency division multiple access in 3rd Generation Partnership Project (3GPP) long-term evolution (LTE), are normally employed. However, these signals usually have a high peakto-average power ratio (PAPR) and are quite vulnerable to nonlinear distortion in the RF PAs.…”

Section: Introductionmentioning

confidence: 99%

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A Robust Augmented Complexity-Reduced Generalized Memory Polynomial for Wideband RF Power Amplifiers

Liu

Zhou

Chen

et al. 2014

IEEE Trans. Ind. Electron.

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This paper proposes a robust model for the accurate behavioral modeling and digital predistortion (DPD) of wideband radio-frequency power amplifiers (PAs). It is constructed using a complexity-reduced generalized memory polynomial (MP) (GMP) (CR-GMP) connected with a nonlinear memory effect (NME) subblock in parallel. The CR-GMP is a complexity-reduced but accuracy-degraded version of the conventional GMP, and its performance is augmented by the extra NME subblock. Hence, the proposed model is termed as augmented CR-GMP (ACR-GMP). The resultant ACR-GMP model can achieve comparable performance as the GMP model, but with much fewer coefficients and lower complexity. Its performance is experimentally assessed both in forward modeling and DPD linearization. Comparisons are conducted between the ACR-GMP model and some state-of-the-art models, such as the MP, the PLUME, and the GMP. Experimental results have been given for a 1.9-GHz 35-W peak-power GaN Class-AB PA driven by two signal scenarios: a 15-MHz bandwidth long-term-evolution signal and a 20-MHz bandwidth widebandcode-division-multiple-access 1001 signal (with the middle two carriers OFF). All the results show that the ACR-GMP model outperforms both the MP and the PLUME models in terms of performances and the GMP model in terms of complexity (at comparable performances).Index Terms-Behavioral modeling, digital predistortion (DPD), generalized memory polynomial (MP) (GMP), memory effect, MP, power amplifiers (PAs).

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Section: Acr-gmp Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Robust Augmented Complexity-Reduced Generalized Memory Polynomial for Wideband RF Power Amplifiers

Liu

Zhou

Chen

et al. 2014

IEEE Trans. Ind. Electron.

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“…The type of scaling tends to increase the overall latency [16]. Therefore, to minimize the latency, the normal iterations and the scaling should be separated.…”

Section: Figure 2 Fully Parallel Cordic[11]mentioning

confidence: 99%

Reconfigurable Design of Rectangular to Polar Converter using Linear Convergence

Agrawal¹,

Mehra²

2012

IJCA

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In recent years, the growth of multimedia services and applications in digital data transmission has led to ever increasing demands of effective data transmission over the wired as well as wireless communication systems. Since digital communication systems need to deal with multimode and multiband operations on complex signals many-a-times, there is always a requirement of an efficient method for rapid phase and magnitude extraction. The proposed Rectangular to Polar Converter (RPC) has been implemented using fully parallel CORDIC, a Linear Convergence Algorithm, in vectoring mode. The design is synthesized with ISE 10.1 software, and implemented on 2v3000fg676-4. Synthesis results show that the design is able to work at 177.620 MHz with less hardware requirements. General TermsA rectangular to polar conversion is required so that transmitters must accommodate constant envelop signals as well as non-constant envelop signals to achieve multimode and multiband operations. In burst-mode communication systems, a rapid carrier is crucial. Hence a fast rectangular-topolar conversion is needed. Delay-matching of phase as well as amplitude is crucial so that the restoration of the transmitted data at the receiver may be not be imperfect if the delays are unmatched.

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“…This design requires additional circuitry in order to achieve multiband operation; whereas in order to achieve multimode operation, analog transmitter architectures must be able to accommodate constant envelope signals (phase and frequency modulations), as well as non-constant envelope signals (amplitude modulated) simultaneously. To avoid distortion of nonconstant envelopes, analog transmitters must employ linear (class A) amplifiers or use predistortion techniques to linearize slightly saturated (class A/B) amplifiers [3]. Both of these implementations sacrifice power efficiencies and result in decreased battery life for the user when the transmitter is operating in constant envelope mode.…”

Section: Introductionmentioning

confidence: 99%

Efficient Rectangular to Polar Conversion for Multiband and Multimode Wireless Communications

Agrawal¹,

Mehra²

2013

IJCA

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The necessity of high data rates wireless communication becomes important for the end-user, especially to support high mobility lifestyle "always get connected", and demand for the multimedia communication, such as the video phone, live streaming, online gaming, and the Internet. Since wireless communication systems need to deal with multiband and multimode operations on complex signals many-a-times, the efficient phase and magnitude extraction is always needed. This paper presents an architecture for the efficient rectangular to polar conversion (RPC) for these multiband and multimode wireless communications using fully parallel CORDIC, a Linear Convergence Algorithm. The architecture was synthesized with ISE 10.1 software and was implemented in a Xilinx FPGA device achieving better performance than the previous LUT-based approaches. General TermsCurrent wireless communication systems require a multiband/multi-standard approach, so that several communication standards can be incorporated in one device to satisfy the users who expect mobility, ubiquitous connection and high data rates at the same time. Instead of including an independent architecture for each standard, universal transmitter architecture capable of generating all the different standards waveforms seems to be the best solution. Also the rapid evolution of the communication systems has created new demands on multimode systems that support various modulation formats such as Quadrature Amplitude Modulation (QAM) for 3G system, and Orthogonal Frequency Data Multiplex Modulation (OFDM) for 4G and DVB-T/H systems. An efficient rectangular to polar conversion is required so that transmitters must accommodate constant envelop signals as well as non-constant envelop signals to achieve multimode and multiband operations.

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A CMOS Low-Power Digital Polar Modulator System Integration for WCDMA Transmitter

Cited by 8 publications

References 25 publications

A Robust Augmented Complexity-Reduced Generalized Memory Polynomial for Wideband RF Power Amplifiers

A Robust Augmented Complexity-Reduced Generalized Memory Polynomial for Wideband RF Power Amplifiers

Reconfigurable Design of Rectangular to Polar Converter using Linear Convergence

Efficient Rectangular to Polar Conversion for Multiband and Multimode Wireless Communications

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