正交频分复用OFDM技术的研究(5)

SADF

The research of the Orthogonal Frequency Division

Multiplexing OFDM technology

Abstract

OFDM (Orthogonal Frequency Division Multiplexing) that is Orthogonal Frequency Division Multiplexing, is a special multi-carrier modulation technique. OFDM full name Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing), is a new type of highly efficient multi-carrier modulation technique, it can effectively fight against multi-path communication, so that the signal interference can reliably receive. After several decades of development after, OFDM / COFDM has been widely used in high-speed digital communications, and has spread to other areas. At the same time modern digital signal processing technology and ultra-large-scale application specific integrated circuits (VLSI) also makes the development of the fast Fourier transform to achieve change more easily so that the cost of the technology to achieve more practical, for the future OFDM widely used in the field of communication open The road.

At the first the Papers Research the OFDM theory, and on the focus of the frequency selective fading channel OFDM technology to solve the interference problem between the code of principle; summary of OFDM-based wireless local area network, using the System View OFDM-based wireless LAN system simulation and May affect the outcome of the signal to noise ratio, modulation and channel mapping an analysis of the results in line with expectations. Keywords：（OFDM）Orthogonal Frequency Division Multiplexing, Multi-carrier modulation, SNR, Modulation mapping.

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