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The Modulation and Test of Link Performance in the Cognitive LTE System

Author: YangYiFan
Tutor: YangLongXiang
School: Nanjing University of Posts and Telecommunications
Course: Electronics and Communication Engineering
Keywords: cognitive radio the sense of spectrum downlink NC-OFDM FFT puring
CLC: TN929.5
Type: Master's thesis
Year: 2012
Downloads: 49
Quote: 0
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Abstract


As people’s telecommunication demand quickly increases, the lack of the spectrum has become a serious problem that concerns the future of telecommunication career. It has been proposed cognitive radio can improve the usage of the spectrum. It can automatically sense the spectrum information cognitive radio system at the time in the system and access the useful spectrum to communicate to largely improve the usage of spectrum without interfere with the primary user via intelligently modify the access parameters.The character of cognitive radio is intelligently studying and automatically modifying parameters, however, to finish these steps, the spectrum condition must be sensed right. The paper has proposed a method to exchange the spectrum mask information, with simulation results implying that nearly identical masks for both sides can be achieved.It is discussed in this paper that how the downlink access in the cognitive LTE system. The downlink of traditional LTE system adopts OFDM, however, in the cognitive LTE system, the performance will recede if OFDM remains because of the non-cotiguous spectrum. So, it has been proposed that NC-OFDM which can adapt to non-cotiguous spectrum and adapt to cognitive LTE downlink.In this paper, it has been researched that how two different systems work and the difference between their performances. It is proposed that FFT puring can increase the speed of FFT operation and the simulation result tells that the proposed algorithm rapidly reduces the operating time of FFT.

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