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首页> 外文期刊>International Journal of Engineering Research and Applications >Performance of OFDM QPSK, 16-QAM System using Pilot-Based Channel Estimation in presence of Doppler Frequency Shift over Rayleigh Fading Channel
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Performance of OFDM QPSK, 16-QAM System using Pilot-Based Channel Estimation in presence of Doppler Frequency Shift over Rayleigh Fading Channel

机译：在瑞利衰落信道上存在多普勒频移的情况下，使用基于导频的信道估计的OFDM QPSK，16-QAM系统的性能

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With the rapid growth of digital communication in recent year the need for high speed data transmission is increased, OFDM is a promising solution for achieving high data rates in mobile environment, due to its resistance to ISI and ICI, which are the common problems found in high speed data communication. In this paper, the performance of different pilot based channel estimation schemes for OFDM with QPSK and 16 QAM over Rayleigh fading channel are investigated. In the block type pilot arrangement, the performance of channel estimation is analyzed with three different algorithms: LS, LMMSE and SVD algorithm. In comb type pilot arrangement, the paper introduces three method of interpolation: linear interpolation, second order interpolation and cubic spline interpolation for channel estimation. Here in this paper, it is our goal to show the way through which the Bit Error Rate (BER) result varies due to Doppler frequency shift. The analysis has been carried out with simulation studies under MATLAB environment
机译：近年来，随着数字通信的迅猛发展，对高速数据传输的需求不断增加，OFDM由于其对ISI和ICI的抵抗力而成为了在移动环境中实现高数据速率的有前途的解决方案，而ISI和ICI是常见的问题。高速数据通讯。本文研究了在瑞利衰落信道上具有QPSK和16 QAM的OFDM不同基于导频的信道估计方案的性能。在块型导频布置中，使用三种不同的算法分析信道估计的性能：LS，LMMSE和SVD算法。在梳型导频布置中，本文介绍了三种插值方法：线性插值，二阶插值和三次样条插值用于信道估计。本文的目的是展示由于多普勒频移而导致误码率（BER）结果变化的方式。该分析已在MATLAB环境下进行了仿真研究

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