衰落信道上ofdm图像传输的最小二乘信道估计

M. UshaS., B. MaheshH.
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引用次数: 2

摘要

无线通信是在人群中传递音频或视频信息的最有效的通信方式。它使大众能够在世界各地联系起来。无线技术改善了农村和通信条件差地区人们的生活方式。从这个角度来看,可以通过最小化载波干扰来提高可靠信号的质量。本文采用正交频复用技术和信道估计技术对衰落信道中图像信号的误码率进行了分析。正交频分复用(OFDM)提供了显著的带宽效率和增强的抗衰落环境的能力。在OFDM中,使用多个相互正交的子载波对数据进行调制。在OFDM符号之间插入一个循环前缀以消除符号间干扰和载波间干扰。采用最小二乘信道估计方法来减小多径衰落的影响。在OFDM和信道估计的基础上,采用BPSK、QPSK、16QAM和64QAM数字调制方案对图像信号进行调制,并在AWGN和衰落信道上传输。这项工作的目的是通过减少干扰来提高信噪比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Least square channel estimation for image transmission with ofdm over fading channel
Wireless communication is the most effective communication to convey audio or video information among the population. It enables the masses to connect throughout the world. Wireless technologies improve the lifestyle of individuals in rural and poor communication areas. In this view, the quality of a reliable signal can be enhanced by minimizing carrier interference. In this paper bit error rate of an image, signal is transmitted over fading channel is analyzed using orthogonal frequency multiplexing and channel estimation technique. An Orthogonal Frequency Multiplexing (OFDM) provides prominent bandwidth effectiveness and improved immunity to the fading environments. In OFDM, the data is modulated using multiple numbers of subcarriers that are orthogonal to each other. A cyclic prefix is infixed between OFDM symbols to annihilate the inter symbol interference (ISI) and inter-carrier interference (ICI). The least square channel estimation method is used to minimize the effect of multipath fading. An image, signal is modulated using BPSK, QPSK, 16QAM and 64QAM digital modulation schemes with OFDM and channel estimation and transmitted over AWGN and fading channel. The objective of this work is to improve the signal to noise ratio by reducing interference.
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