2014年功率放大器外文翻译--下一代无线通信的功率放大器设计方法

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1、3200 英文单词， 1.7 万英文字符 ， 中文 5200字 文献出处： Eswaran U, Ramiah H, Kanesan J. Power amplifier design methodologies for next generation wireless communicationsJ. IETE Technical Review, 2014, 31(3): 241-248. Power Amplifier Design Methodologies for Next Generation Wireless Communications U. Eswaran, H. Ramiah

2、 and J. Kanesan Abstract As wireless communication standard continues to evolve accommodating the demand of high data rate operation, the design of radio frequency (RF) power amplifier (PA) becomes ever challenging. PAs are required to operate more efficiently while maintaining stringent linearity r

3、equirement. In this paper, the design concepts of the PA in addressing these challenges are reviewed. The concepts are divided into two main categories, namely the linearization technique and efficiency enhancement technique. The mandatory attempt in realizing a low-cost design is also discussed. Ke

4、ywords: Power amplifiers, Linearization, Wireless, LTE. 1. INTRODUCTION As the demand for higher data rate continuously increases, the transition from wideband code division multiple access (WCDMA) communication standard to 3rd generation partnership project (3GPP) long-term evolution (LTE) begins t

5、o pave through the entrance of realization. LTE employs single carrier frequency division multiple access (SC-FDMA) for uplink and orthogonal frequency division multiple access (OFDMA) for down- link, a multicarrier modulation scheme ensuring spectral efficiency 1. This modulation scheme is subjecte

6、d to high peak to average ratio (PAPR). SC-FDMA has a similar performance and complexity respective to OFDMA, in favour of lower PAPR 2. Typically, the PAPR of SC- FDMA signal is 7 dB whereas OFDMA is 10 dB, heavily depending on the modulation scheme adapted (quadrature phase shift keying QPSK, 16 quadrature amplitude modulation QAM, or 64 QAM) 3. To amplify signals with high PAPR, the power amplifier (PA) needs to operate at a backed-off output power satisfying the stringent linear