多径衰落信道调制方案研究

Karthik Kumar Vaigandla, Allanki Sanyasi Rao and Kallepelli Srikanth
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引用次数: 10

摘要

通过无线信道协调的通信系统取决于环境。通过对无线信道的正确分析,可以提高通信系统的可靠性和效率。当今最重要的特性是高数据速率和可靠的性能,以便在这个新的信息时代利用可行的网络。在无线通信中,信道不是时不变的,因此接收到的信号由于多径衰落而表现出幅度、相位和角度的变化。数据量的增加和带宽的降低使正交频分复用(OFDM)成为无线通信系统的重要组成部分。OFDM技术非常有效地利用了多个载波。该方案鲁棒性地降低了干扰,并且易于适应衰落情况。分析数字调制方案需要评估衰落信道下的链路性能。本文比较了不同调制方案在不同衰落环境下的信道性能。研究了用BPSK、QPSK和m - mary QAM调制的AWGN信道、梨衰落信道和瑞利衰落信道的误码率和信噪比特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of Modulation Schemes over a Multipath Fading Channels
Communications systems concerted over wireless channels depend on the environment. Communications system can be more reliable and efficient by properly analyzing wireless channels. Today's most important features are a high data rate and reliable performance to exploiting viable networks during this new information age. The channel is not time-invariant in wireless communication, so the received signal exhibits amplitude, phase, and angle variations due to multipath fading. Increasing data rates and reducing bandwidth make Orthogonal Frequency Division Multiplexing (OFDM) an important component of wireless communication systems. The OFDM technique uses many carriers very efficiently. With this scheme, interference is robustly reduced, and fading scenarios are easily accommodated. Analyzing digital modulation schemes requires evaluating link performance with fading channels. The paper compares channel performance over varying fading environments using a variety of modulation schemes. We study the BER and SNR properties of the AWGN, Rician fading and Rayleigh fading channels modulated with BPSK, QPSK, and M-ary QAM.
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