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Research on Key Technologies of Physical Layer in 4G System

Author: LiuXiaoLan
Tutor: YangLongXiang
School: Nanjing University of Posts and Telecommunications
Course: Communication and Information System
Keywords: 4G Orthogonal Frequency Division Multiplexing PAPR Partial transmit sequence Threshold
CLC: TN919.3
Type: Master's thesis
Year: 2012
Downloads: 34
Quote: 0
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Abstract


With the development of wireless communication , many businesses need increasingly high data transfer rates , the use of traditional single-carrier communication system will be difficult to meet the system performance requirements . OFDM technology by virtue of it can effectively solve the channel multipath effects , and has the advantage of higher spectrum utilization , and become an integral part of a fourth-generation mobile communication system technology plays an important role . So far , many communication systems are actively using this technology . However, OFDM technology has a fatal flaw , is the signal of the peak-to-average power ratio , is likely to cause distortion of the OFDM signal , so that the performance of the system is decreased . PAPR reduction in OFDM signals have great significance . In this article, a profound study of this problem of PAPR reduction in OFDM systems . Firstly simple analysis of the basic principles of the OFDM , and detailed description of some of the important technologies of the OFDM system ; then analyzed on the OFDM system , PAPR defined and summarized to reduce the OFDM signal peak to average power ratio of several typical methods The encoding class technology , limiting class technology and probability class technology . Depth study of the the traditional PTS algorithm and suboptimal PTS algorithm and two improved algorithms are proposed on the basis of these two algorithms : the dichotomy the PTS algorithm and threshold - based PTS algorithm . The dichotomy the PTS algorithm by way of the front half part of the weighting coefficients of the weighting coefficients each determined to be determined , and further reduce the number of iterations of the IPTS ; based threshold PTS algorithm by setting a suitable threshold in dichotomy PTS algorithm on another to further reduce the number of calculations . Finally , using MATLAB simulation performance . Simulation results show that compared with the conventional PTS algorithm , the PTS algorithm although smaller PAPR performance degradation , but are effective in reducing the number of calculations .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Data communication > Data transmission technology
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