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Research and Realization of TOFDM Modem Technology

Author: HaoQingTao
Tutor: ZengXingZuo；QinJianCun
School: Xi'an University of Electronic Science and Technology
Course: Electronics and Communications
Keywords: Orthogonal frequency division multiplexing time Multipath Intersymbol interference PAPR
CLC: TN915.05
Type: Master's thesis
Year: 2010
Downloads: 53
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Abstract


The project aim is to achieve strong multipath channel environments reliable transmission of information . The proposed time orthogonal frequency division multiplexing (TOFDM) modulation and demodulation techniques , with anti -multipath capability , excellent anti- offset capability and low PAPR prominent feature is a strong multipath target to provide wireless communication between a feasible solution. Text discusses in detail TOFDM modem from the basic concept to the actual circuit design concepts and encountered problems . This paper introduces the topic needs, and multi- carrier modulation , TOFDM modulation of the basic concepts . Then introduced the common phase modulation techniques, and use of the program elaborated the π/4-DQPSK modem technology . Secondly highlights TOFDM key technology , which analyzes the causes of inter-symbol interference and resistance methods ; introduced PAPR related concepts and illustrates the PAPR role in the communication system , the use of Matlab TOFDM signal peaks than was simulated ; analysis raises TOFDM signal frequency multiplexed signal bandwidth and the number of the design, calculation methods ; proposed and analyzed for the variable parameter channel characteristics , to achieve bit synchronization. Based on the above analysis , combined with the needs of this project , completed the TOFDM modem circuit design and software and hardware implementation , a detailed analysis of the use of the device 's basic principles and characteristics of the device . And in the indoor environment , tested under the conditions of its participation in the constant white noise resistance capability and multi-path conditions in a simulated anti-multipath capability and white noise. Finally, this paper is summarized and discussed. In summary, the paper completed TOFDM modem theoretical research, design and implementation of software and hardware on the modem developed a detailed performance test results show that the modem has a strong combat multipath capabilities , to meet the system requirements.

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