| Presentation | 2007-11-08 Delta-Sigma Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Linear Amplification Edwin M. UMALI, Yoshikazu TOYAMA, Yasushi YAMAO, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Multi-carrier systems such as the OFDM require linear amplification and have low power efficiency because of a high peak-to-average power ratio (PAPR). In an Envelope Pulse-Width Modulation (EPWM) transmitter, the envelope component of a linear modulation wave is converted to a PWM signal by a delta-sigma (Δ-Σ) modulator while the phase component modulates the carrier signal. The distortion-free amplitude multiplexing of the PWM and PM signals enables the power amplifier to achieve maximum power efficiency. In this paper, EPWM transmitter characteristics such as noise power spectral density and signal SNR will be analyzed. The application of the EPWM transmitter to OFDM signals will also be simulated. From the simulation results, the Δ-Σ modulator with oversampling ratio of 32 provides sufficient in-band SNR and adjacent channel power ratio required for the IEEE 802.11a OFDM system. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | RF transmitter / power efficiency / EPWM / OFDM / Delta-Sigma modulator |
| Paper # | RCS2007-103 |
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| Conference Information | |
| Committee | RCS |
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| Conference Date | 2007/11/1(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Radio Communication Systems (RCS) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Delta-Sigma Envelope Pulse-Width Modulation (EPWM) Transmitter for High Efficiency Linear Amplification |
| Sub Title (in English) | |
| Keyword(1) | RF transmitter |
| Keyword(2) | power efficiency |
| Keyword(3) | EPWM |
| Keyword(4) | OFDM |
| Keyword(5) | Delta-Sigma modulator |
| 1st Author's Name | Edwin M. UMALI |
| 1st Author's Affiliation | Advanced Wireless Communication Research Center, the University of Electro-Communications() |
| 2nd Author's Name | Yoshikazu TOYAMA |
| 2nd Author's Affiliation | Advanced Wireless Communication Research Center, the University of Electro-Communications |
| 3rd Author's Name | Yasushi YAMAO |
| 3rd Author's Affiliation | Advanced Wireless Communication Research Center, the University of Electro-Communications |
| Date | 2007-11-08 |
| Paper # | RCS2007-103 |
| Volume (vol) | vol.107 |
| Number (no) | 306 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |