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Variable rate CPFSK modulation technique

机译:可变速率CPFSK调制技术

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This paper presents a new modulation technique called variable rate M-CPFSK modulation. It consists of the 2-CPFSK, 4-CPFSK and 8-CPFSK modulation schemes with modulation indices h=l/2, 1/4 and 1/8 respectively. The number of modulation levels M varies in accordance with the mobile radio channel impairments experienced by a radio signal.rnAdditive white Gaussian noise, Rayleigh fading and Doppler frequency shift are considered in the simulation model. The eye pattern is used as the basis for the switching thresholds. The results show that a variable rate M-CPFSK modulation with an average of 2 bits per symbol interval outperforms the constant rate 4-CPFSK modulation giving the same average transmission rate.
机译:本文提出了一种新的调制技术,称为可变速率M-CPFSK调制。它由2-CPFSK,4-CPFSK和8-CPFSK调制方案组成,调制方案分别为h = 1 / 2、1 / 4和1/8。调制级别M的数量根据无线电信号受到的移动无线电信道的损害而变化。在仿真模型中考虑了加性高斯白噪声,瑞利衰落和多普勒频移。眼图用作切换阈值的基础。结果表明,每个符号间隔平均2位的可变速率M-CPFSK调制性能优于恒定速率的4-CPFSK调制,从而提供相同的平均传输速率。

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