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| Presentation | 2008-08-27 16:50 In-Band Noise Analysis and Peak-Clipping Effect on Envelope Pulse-Width Modulation(EPWM) Transmitter Edwin M. Umali, Koji Kawazoe, Yoshikazu Toyama, Yasushi Yamao (Univ. of Electro-Comm.)  RCS2008-68 |
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| Abstract | (in Japanese) | (See Japanese page) |
| (in English) | The Envelope Pulse-Width Modulation (EPWM) transmitter enables a highly efficient linear amplification. Noise characteristics of a 1st order delta-sigma (?-?) 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 ?-? 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 2nd order ?-? 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. | |
| Keyword | (in Japanese) | (See Japanese page) |
| (in English) | RF transmitter / power efficiency / EPWM / OFDM / delta-sigma modulator / / / | |
| Reference Info. | IEICE Tech. Rep., vol. 108, no. 188, RCS2008-68, pp. 91-96, Aug. 2008. | |
| Paper # | RCS2008-68 | |
| Date of Issue | 2008-08-20 (RCS) | |
| ISSN | Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 | |
| Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) | |
| Download PDF | RCS2008-68 |
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| Conference Information | |
| Committee | RCS |
| Conference Date | 2008-08-27 - 2008-08-29 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Hokkaido University |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | |
| Paper Information | |
| Registration To | RCS |
| Conference Code | 2008-08-RCS |
| Language | English |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | In-Band Noise Analysis and Peak-Clipping Effect on Envelope Pulse-Width Modulation(EPWM) Transmitter |
| Sub Title (in English) | |
| Keyword(1) | RF transmitter |
| Keyword(2) | power efficiency |
| Keyword(3) | EPWM |
| Keyword(4) | OFDM |
| Keyword(5) | delta-sigma modulator |
| Keyword(6) | |
| Keyword(7) | |
| Keyword(8) | |
| 1st Author's Name | Edwin M. Umali |
| 1st Author's Affiliation | University of Electro-Communications (Univ. of Electro-Comm.) |
| 2nd Author's Name | Koji Kawazoe |
| 2nd Author's Affiliation | University of Electro-Communications (Univ. of Electro-Comm.) |
| 3rd Author's Name | Yoshikazu Toyama |
| 3rd Author's Affiliation | University of Electro-Communications (Univ. of Electro-Comm.) |
| 4th Author's Name | Yasushi Yamao |
| 4th Author's Affiliation | University of Electro-Communications (Univ. of Electro-Comm.) |
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| Speaker | Author-1 |
| Date Time | 2008-08-27 16:50:00 |
| Presentation Time | 25 minutes |
| Registration for | RCS |
| Paper # | RCS2008-68 |
| Volume (vol) | vol.108 |
| Number (no) | no.188 |
| Page | pp.91-96 |
| #Pages | 6 |
| Date of Issue | 2008-08-20 (RCS) |
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