Orthogonal frequency division multiplexing using continuous phase modulation with time-limited and time-unlimited phase shaping pulses
| Autor: | Guan-Hao Chen, 陳冠豪 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 Orthogonal Frequency Division Multiplexing (OFDM) modulation have the properties of high rates of data transmission capability, spectral performance improvement and robust to multi-path fading, inter-symbol interference, co-channel interference, now it is applied broadly to a wireless communication system. Continuous Phase Modulation (CPM) signals have the properties of constant envelope, bandwidth efficiency, power efficiency and low spectral side-lobe. However, most of the CPM modulation populations can not produce orthogonal subchannel signals, it can not be used in OFDM systems, in this paper, and we derive what groups CPM modulation applied to OFDM systems, the results show that by appropriate selection of the frequency of the modulation factor and the difference between the sub-channels, and the two pulse shaping phase of CPM: Rectangular Time-Unlimited Phase Shaping Pulses (REC-TU) and Rectangular Time-limited Phase Shaping Pulses (REC-TL), OFDM signals orthogonal to meet with overlapping spectral characteristics, we derive a system for white noise and Flat Rayleigh Fading Channels BER simulation and analysis, the results showed that meet coefficient OFDM-CPM modulation system is a so-called most Catastrophic Modulation Index characteristics, so the error rate than the Euclidean distance estimation is better, results with BPSK BER do performance and analyzed and compared. In our research, OFDM-CPM-TL in the multi-carrier transmission for each subcarrier frequency spacing should be less than OFDM-CPM-TU, which may indicate OFDM-CPM-TL spectrum efficiency can be effectively utilized for high-rate data transmission. In addition, this study did not explore how to use OFDM in the Fast Fourier Transformation (FFT) and Inverse Fast Fourier Transformation (IFFT) mechanism to simplify the design of the transmitter and the receiver, this is the future needs to be done. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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