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Predict Phase-Noise Effects In Digital Communications Systems

机译:预测数字通信系统中的相位噪声影响

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摘要

Communications providers are reaping the benefits of replacing older amplitude-modulation (AM) and frequency-modulation (FM) systems with modern digital communications systems. These newer systems are based on quadrature-amplitude-modulation (QAM) and quadrature-phase-shift-keying (QPSK) methods that encode information in the amplitude and phase of the signal. Unfortunately, frequency-translation stages in most communications systems can still impart unwanted phase noise onto the desired signal. To prevent deleterious effects of phase noise, engineers must plan for it in their link budgets. What follows is an effective procedure for calculating the impairment loss due to phase noise.
机译:通信提供商正在收获用现代数字通信系统代替较旧的幅度调制(AM)和频率调制(FM)系统的好处。这些较新的系统基于正交幅度调制(QAM)和正交相移键控(QPSK)方法,它们在信号的幅度和相位中编码信息。不幸的是,大多数通信系统中的频率转换级仍然可以将不需要的相位噪声施加到所需信号上。为了防止相位噪声的有害影响,工程师必须在链路预算中对此进行规划。以下是计算由于相位噪声引起的减损的有效程序。

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