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Adaptive modulation techniques of signal transmission of the radio channel

Author: ZuoDaoHua
Tutor: ZhaoHuiChang
School: Nanjing University of Technology and Engineering
Course: Communication and Information System
Keywords: Bandwidth efficiency Adaptive modulation techniques Nakagami fading Variable rate QAM FDD TDD
CLC: TN761
Type: Master's thesis
Year: 2002
Downloads: 346
Quote: 2
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Abstract


Adaptive modulation technology is a hot area of ??mobile communications in recent years . In this paper, a more in-depth study of variable rate QAM modulation in mobile communications . First, an overview of the fading characteristics of a mobile communication channel , respectively, of the shadow fading of the channel , slow fading , fast fading several models ; analysis followed by QAM modulation principle , focusing on the parameter settings for this modulation and constellation the diagram of the design , the text shown in the block diagram and waveforms of the 8QAM and 16QAM . Then the adaptive program of energy transferred to the channel , the first Nakagami fading factor appropriate adjustments can be approximated by studying common Rayleigh fading and Rician fading , and then studies using three different adaptive wireless channel program when the channel capacity , the study shows that the rate adjustment is critical to increase the channel capacity , and on this basis , focuses on a discrete variable rate QAM signal , indicating that this modulating scheme in terms of bandwidth utilization and average system error rate improve a lot more than the other cases . In the last section of the article through the simulation of a base station and a mobile terminal through the modulation scheme , further proof of the feasibility of such programs .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Modulation technique and the modulator,demodulator and the demodulator > Modulation technique and the modulator
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