TAILIEUCHUNG - WIMAX, New Developments 2011 Part 3

Tham khảo tài liệu 'wimax, new developments 2011 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 3 Mobile WiMAX Handset Front-end Design Aspects and Challenges Václav Valenta1 2 Geneviève Baudoin2 Antoine Diet3 Roman Marsálek1 Fabien Robert2 Martha Suarez2 and Martine Villegas2 I-Brno University of Technology Department of Radioelectronics 2Université Paris-Est ESIEE Paris 3Université Paris-Sud 11 UMR 8506 1Czech Republic 2 3France 1. From the Standard and Regulations to Front-End Specifications WiMAX standards and regulations specify the minimum requirements for RF transceivers. They are expressed by parameters which can take values that impose more or less stringent constraints on the RF system blocks such as the Power Amplifier PA synthesizer filters and Low Noise Amplifiers LNA . Among the important parameters are Signal parameters Peak to Average Power Ratio PAPR of waveforms Peak transmitted power or output power level Transmit Power Control TPC precision and range Signal bandwidth Performance criteria for transceivers Noise Noise Factor NF phase noise etc. Linearity AM-AM and AM-PM characteristics of power amplifiers compression points at 1dB interception point noise power ratio etc. Efficiency drain efficiency power added efficiency global efficiency Signal to Noise plus Distorsion Ratio SNDR System performance Bit Error Rate BER and Error Vector Magnitude EVM Adjacent Channel Interference ACI Adjacent Channel Leakage Ratio ACLR or Adjacent Channel Power Ratio ACPR Spectrum mask 48 WIMAX New Developments System parameters or modes Frequency bands and channel frequency step Channel bandwidth and data rate Duplexing mode in time TDD frequency FDD or half duplex FDD HFDD Multi-antenna MIMO and smart antenna possibility Peak to Average Power Ratio PAPR of Waveforms OFDM modulation has many well-known interests for mobile communications robustness to multi-path simple equalization and good spectral efficiency. Unfortunately OFDM waveforms are characterized by high PAPR. It is sometimes noted Peak to Mean Power Ratio PMPR . This power ratio measures signal .

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