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Research and Realization of Peak-to-Average Power Ratio Reduction in Multi-carrier Systems

Author: ZouYing
Tutor: ZhouLiQing
School: Beijing University of Posts and Telecommunications
Course: Circuits and Systems
Keywords: Multi-carrier technology Peak-to-average power ratio Orthogonal Frequency Division Multiplexing Selective Mapping Space - time block codes Feedback - selective multi- antenna collaborative mapping Adaptive multi-antenna collaboration selective mapping
CLC: TN919.3
Type: Master's thesis
Year: 2010
Downloads: 45
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Abstract


Multi-carrier technology because of the high spectral efficiency, strong multipath immunity capacity and flexibility combined with other technologies, it has a wide range of applications in the field of wireless communications. However, because of the technical characteristics of the multi-carrier communication system which will inevitably produce peak power ratio can easily lead to signal distortion, spectrum spread is decreased and the overall system performance, thereby seriously affecting the development of a multi-carrier technology. Therefore, this paper focuses on how to effectively optimize multi-carrier technology peak to average power ratio (PAPR) characteristics. This thesis the basic principle of the multi-carrier technique, various basic implementation of the modulation and demodulation process and the multi-carrier technology, such as discrete multi-tone, orthogonal frequency division multiplexing, multi-carrier code division multiple access and other technologies. Intrinsic relationship to a large extent and OFDM for the multi-carrier technology, focused on the key technologies of OFDM system causes the PAPR calculation and measurement mechanisms. The paper examines the current academic field a variety of reducing the PAPR value method of multi-carrier system. The method can be divided into three categories: limiter class technical coding class technology, probability class technology. Limiting technology focuses on the principle of limiting filtering techniques, mathematical analysis. Encoding class technology research is mainly complementary Golay code with the characteristics of the transmission of the multi-carrier system by mathematical analysis of the derivation, herein expounded properties of the Golay codes, Golay code used in the system encoder, complementary Golay sequences relationship binary Reed-Muller codes, as well as non-binary Reed-Muller code, and the process of complementary Golay code is generated by the Reed-Muller code. The probability class technology is the focus of this paper, and SLM technology selective mapping (SLM) and partial transmit sequence similarity with the SLM (PTS) technology, this part of the study is the technology mechanism, on the methods of implementation, and SLM systems the contribution of the PAPR characteristics. Study the literature [25] mentioned in the multi-antenna collaborative selective mapping (CSLM) method and the traditional independent selective mapping (ISLM) method. The program's basic principle is added on each transmit antenna in order to reduce the transmission of the auxiliary information the uniform phase information so that each set of antennas are used for the same receiving end sideband M antennas, so that only the multi-transport the additional information, and the the ISLM program of the same input characteristics system needs to send information sidebands the CSLM The NT times (NT is the number of transmission side branch). This part of the method of the ISLM, and CSLM mechanism, system features, as well as their advantages and disadvantages. In the large number of studies of the absorption CSLM technical advantage of the premise the of various related reducing the PAPR value of the system based on the for CSLM technology characteristics, a new improved method the feedback type multi-antenna synergistic selective mapping (FCSLM) . The elaborated design ideas, motivation and purpose, and then do on FCSLM technical detail the principles of analysis, mathematical derivation, performance analysis and simulation. This method to a certain extent, to achieve the purpose of the optimization system PAPR characteristics. FCSLM method to a certain extent improve the CSLM method, and also has a certain significance, but the premise is without considering the system itself may encounter special phase-sequence at the transmitting end of the extracted property deteriorated. Otherwise, the situation will affect the emergence of the next set of sequence modulation performance, and even lead to a vicious cycle. Adaptive antenna collaboration selective mapping (ACSLM) well solve this problem, it is the use of loop decision feedback mechanism system, the modulation phase sequence constantly optimized in order to achieve the purpose of the optimization system PAPR characteristics.

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