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Reduceing Papr of OFDM System Based on SLM and Constellation Mapping

Author: ZhangYuWei
Tutor: SuYanYong
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Orthogonal Frequency Division Multiplexing Peak to average power ratio Selective mapping Constellation mapping
CLC: TN919.3
Type: Master's thesis
Year: 2010
Downloads: 74
Quote: 1
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Abstract


With the development of wireless communication , and many business needs higher and higher data transmission rate , using the conventional single -carrier communication system will be difficult to meet the system performance requirements. Since the channel can be effective against multi- path effects and has a high spectral efficiency , has been used in many communication systems orthogonal frequency division multiplexing are considered next-generation mobile communication system, one of the key physical layer . However, since there is a higher peak to average power ratio , easy to cause OFDM system performance. Therefore, we must try to reduce the OFDM system PAPR . This paper focuses on how to effectively reduce OFDM system PAPR studied and focused on the selective mapping method and the constellation mapping method . In this paper, the basic principle of OFDM system , a detailed exposition of the key building OFDM system technology , introduces the OFDM system peak to average power ratio (PAPR) of the definition of the peak value of the signal generated causes and peak signal statistics , summary reducing PAPR of OFDM various methods, such as limiting class technology , coding class technology and probability class technologies. Mainly discussed the probability selective class technology mapping method (SLM) and limiting class technology in the constellation mapping method . In conventional SLM method based on improved simulation shows the improved algorithm outperforms traditional SLM SLM. Constellation mapping method because at the receiving end for an effective data recovery, under the same threshold of its performance is better than hard- limiting law . As this new program, given a probability class technology and limiting class technology combined with OFDM system is used to reduce PAPR. Probability and Statistics in the same or similar characteristics , the improvement of the SLM was significantly lower than traditional computing SLM; at the same limiter threshold, at the receiving end constellation mapping method can effectively carry out data recovery, hard-limiting error method outperforms Therefore the improved SLM method combined with the constellation mapping , the system 's overall performance is better than the traditional method of SLM combined with the hard limiter .

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