In-band noise analysis and peak-clipping effect on envelope pulse-width modulation (EPWM) transmitter (無線通信システム)
スポンサーリンク
概要
- 論文の詳細を見る
The Envelope Pulse-Width Modulation (EPWM) transmitter enables a highly efficient linear amplification. Noise characteristics of a 1st order delta-sigma (Δ-Σ) modulator EPWM transmitter have been presented. However, in this paper, a different approach to analyzing the in-band noise characteristics of first-order and higher-order Δ-Σ modulators is introduced. The quantizer is modeled as a linear gain plus noise. The effective quantizer gain which can only be obtained through simulations can be used to adjust theoretical values. Distortion noise introduced by envelope clipping is also considered. From the simulation results on the IEEE 802.11a OFDM system, the effective quantizer gain is less than one for 2^<nd> order Δ-Σ modulators. Moreover, a better error-vector magnitude (EVM) estimate can be obtained if the EPWM in-band noise is computed using the bandwidth of the OFDM envelope.
- 社団法人電子情報通信学会の論文
- 2008-08-20
著者
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Yamao Yasushi
Advanced Wireless Communication research Center, the University of Electro-Communications
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UMALI Edwin
Advanced Wireless Communication Research Center, The University of Electro-Communications
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Umali Edwin
Univ. Electro‐commnications Tokyo Jpn
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Umali Edwin
Advanced Wireless Communication Research Center The University Of Electro-communications
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Yamao Yasushi
Univ. Electro‐communications Tokyo Jpn
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Umali Edwin
Advanced Wireless Communication Research Center Of The University Of Electro-communications
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KAWAZOE Koji
Advanced Wireless Communication Research Center, The University of Electro-Communications
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TOYAMA Yoshikazu
Advanced Wireless Communication Research Center, The University of Electro-Communications
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Yamao Yasushi
Advanced Wireless Communication Research Center Of The University Of Electro-communications
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Kawazoe Koji
Advanced Wireless Communication Research Center The University Of Electro-communications
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Kawazoe Koji
Advanced Wireless Communication Research Center Of The University Of Electro-communications
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Toyama Yoshikazu
Advanced Wireless Communication Research Center The University Of Electro-communications
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YAMAO Yasushi
Advanced Wireless Communication Research Center of the University of Electro Communications
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