Future wireless communication systems will have higher data transmission rates and energy efficiencies than those used today. This fact raises serious challenges to the design of conventional transceiver architectures. This doctoral research develops energy-efficient RF transmitters and receivers for next-generation wireless communications. It begins with a theoretical analysis of the injection locking of oscillators and a modified Class-E power amplifier (PA) for use in developing the proposed transmitter and receiver. Based on the presented theory, a novel envelope elimination and restoration (EER)/polar transmitter using injection-locked oscillators (ILOs) and a novel cognitive polar receiver using two ILO stages are proposed. The EER/polar transmitter combines the approaches of EER/polar modulation and injection locking to achieve linear amplification with a high gain and high efficiency. Experimental results demonstrate its effectiveness for delivering WCDMA and EDGE signals. Additionally, the cognitive polar receiver utilizes two ILO stages to extract the modulation envelope and phase components of a received nonconstant envelope modulation signal without using a phase-locked loop (PLL)-based carrier recovery circuit. Experiments are conducted to verify the feasibility of the novel architecture by performing £k/4 DQPSK and QPSK demodulation. Rigorous theoretical analysis and experimental verification prove that both the proposed transmitter and the receiver are effective for energy-efficient wireless communications.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0730112-170528 |
| Date | 30 July 2012 |
| Creators | Chen, Chi-Tsan |
| Contributors | Ken-Huang Lin, Sheng-Fu Chang, Chie-In Lee, Kang-Chun Peng, Shey-Shi Lu, Chin-Chun Meng, Tzyy-Sheng Horng, Kin-Lu Wong |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730112-170528 |
| Rights | user_define, Copyright information available at source archive |
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