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Broadband wireless communication system for blind equalization technology research

Author: LuoChunBo
Tutor: GongYaoZuo
School: University of Electronic Science and Technology
Course: Signal and Information Processing
Keywords: Adaptive equalization Blind Equalization Convex combination Constant modulus algorithm
CLC: TN92
Type: Master's thesis
Year: 2007
Downloads: 198
Quote: 1
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Abstract


The new generation of wireless communication systems require a great deal of data transfer rates and reliable quality of service, and therefore a higher demand for wireless network physical layer. Under conditions of high-speed data transmission, the radio channel frequency selectivity will seriously affect the quality of the signal, resulting in inter-symbol interference. For the inter-code interference on the communication quality, the equalization technique is applied to the communication system in order to reduce or eliminate the resulting performance degradation. Simple structure, reliable performance, balanced technology makes wireless communication system communication quality has greatly improved. The main content of this paper for channel equalization technology. Summed up the wireless communication system technology research overview and analysis of the evolution of the next generation of wireless communication systems technology, outlines the basic theory and algorithms for channel equalization, completed a series of experiments simulation and performance analysis, summed up their application. Particular derivation and simulation to achieve several new equalization techniques, including Turbo equalization algorithms and high-end spectrum blind equalization algorithms, which are of great significance and value. The innovation of this article also includes two new blind equalization algorithm, through some new developments in the field of application of signal processing, blind equalization algorithm we propose only a small amount on the basis of computational complexity significantly improve the balancing effect, corresponding simulation experiments confirmed the excellent performance of the algorithm. Work and innovation of the core is mainly reflected in the following aspects: 1. Study the equilibrium theory and guidelines of typical adaptive equalization algorithm equalizer and complete computer simulation, including simulation to achieve the current new Turbo equalization algorithm. Blind equalization algorithm blind equalizer was in-depth analysis, computer simulation and performance analysis of typical blind equalizer, including extensive research of the constant modulus equalizer, and a new higher-order statistics equalizer. Proposed a constant modulus blind equalization algorithm based on adaptive convex combination, the algorithm takes advantage of the new progress of the field of adaptive signal processing, to avoid the constant modulus blind equalizer step, so the convergence speed, steady-state performance, simulation experiments confirm the excellent performance of the new algorithm. 4. Proposed structure of a hybrid the MMSE blind equalization algorithm, the corresponding results of the optimization theory of the structure and utilization of the algorithm, and combines the advantages of two different types MMSE equalizer, with excellent performance. The simulation results show the advantages of the algorithm. Proposed two new algorithms were implemented in hardware. The experiments laid the foundation for the application and implementation of the new algorithm in actual communication system based on the ADSP-21160 hardware platform.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications
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