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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >Optimum Power Division for Phase-Modulated Deep-Space Communications Links
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Optimum Power Division for Phase-Modulated Deep-Space Communications Links

机译：相位调制深空通信链路的最佳功率分配

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摘要

Optimum power division is required in deep-space communications links to maximize transmission range or data rate and to permit efficient performance of both carrier tracking and data reception functions. A simple, graphical technique has been developed for phase-modulated links to determine the particular set of peak phase deviations, or modulation indexes, which results in an optimum power division between the carrier and any combination of sine-wave and square-wave subcarriers. Whereas previous methods for the selection of modulation indexes generally necessitated either lengthy solutions of simultaneous equations or complex computer programs, the methods developed in this paper involve simplified graphical procedures, using the trigonometric and Bessel function expressions which describe the power balance between carrier and subcarriers. The optimization procedure is a valuable tool for preliminary design analysis and should be of interest to communications-system engineers, The techniques developed here are particularly applicable when subcarriers have wide differences in data rates, since under these conditions, it becomes increasingly difficult to select arbitrarily the proper modulation indexes. Channel optimization is developed for both nominal and worst-case link conditions and examples are presented to demonstrate the techniques involved.
机译：在深空通信链路中需要最佳的功率分配，以最大程度地提高传输范围或数据速率，并有效执行载波跟踪和数据接收功能。已经开发出一种简单的图形技术用于调相链路，以确定特定的一组峰值相位偏差或调制指数，从而在载波以及正弦波和方波子载波的任意组合之间实现最佳功率分配。以往选择调制指数的方法通常需要冗长的联立方程解或复杂的计算机程序，而本文开发的方法则采用简化的图形化程序，使用三角函数和贝塞尔函数表达式来描述载波与子载波之间的功率平衡。优化程序是进行初步设计分析的有价值的工具，并且对于通信系统工程师来说应该是有意义的。这里开发的技术特别适用于子载波的数据速率差异很大的情况，因为在这些条件下，任意选择变得越来越困难适当的调制指标。针对标称和最坏情况的链路条件开发了信道优化，并提供了示例来演示所涉及的技术。

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