Concurrent Multiband Digital Outphasing Transmitter Architecture Using Multidimensional Power Coding
| Autor: | Shintaro Shinjo, Kieran Parsons, Rui Ma, SungWon Chung, Hideyuki Nakamizo, Koon Hoo Teo |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Engineering
Radiation Frequency band business.industry Bandwidth (signal processing) Transmitter Electrical engineering Condensed Matter Physics Channel capacity Baseband Electronic engineering Radio frequency Electrical and Electronic Engineering business Electrical efficiency Pulse-width modulation |
| Zdroj: | IEEE Transactions on Microwave Theory and Techniques. 63:598-613 |
| ISSN: | 1557-9670 0018-9480 |
| DOI: | 10.1109/tmtt.2014.2387845 |
| Popis: | All-digital outphasing transmitter architecture using multidimensional power coding (MDPC) is proposed for noncontiguous concurrent multiband transmission with a high power efficiency. MDPC transforms multiband digital baseband signals into multibit low-resolution digital signals that drive switching-mode PAs. A prototype digital outphasing transmitter consists of two 1-GHz bandwidth GaN Class-D PAs and a Chireix power combiner. The two GaN PAs are driven by bipolar radio frequency (RF) pulse-width modulation (PWM) signals, which are transformed from a concurrent dual-band LTE signal by MDPC. The dual-band LTE signal with 15-MHz aggregate channel bandwidth at 240 and 500 MHz frequency band is transmitted with $-$ 30 and $-$ 37 dBc out-of-band emissions, respectively. Digital outphasing achieves more than two times higher coding efficiency than conventional concurrent dual-band digital transmitters with the same PAs in Class-S operation. Measured power coding efficiencies of 35.4% and 47.1% are observed with outphasing bipolar and 3-level RF PWM signals respectively, which are encoded from the dual-band LTE signal. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|