| 摘要(英) |
LTE(Long Term Evolution) plays an important role in fourth generation of mobile phone and mobile communication technonlogy. In this paper, LTE downlink physical layer which is mentioned according to the standard specifications defined by 3GPP Release 12. Transmitted Frequency Spectrum is divided into Control Region and Data Region by different bandwidth. One of the most important application about Downlink Control Information, carried by Physical Downlink Control Channel, is Resource assignment. In order to get the where is data in Data Region, All of Users must demodulate Downlink Control Information , Before receiving data. However, there is not too much information when Users receiving Physical Downlink Control Channel. Blind decoding is applied in this situation. Otherwise, this paper introduces for the LTE downlink system,including the use of OFDM(Orthogonal Frequency Division Multiplexing) technology, specifications and modulation principle, etc.
In this thesis, we used Software-define-radio to achieve LTE downlink transmitter. By the Software-define-radio platform, we can immediatly transmit and receiver signal in the air on some particular band. Also we can change transmit and receive gain to observe the transformation of the signal in the air, discussion on the quality of the signal and system, etc |
| 參考文獻 |
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sal terrestrial radio access (e-utra); Medium Access Control(MAC) protocol specifi ification,” |
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