Firstly, this thesis analyzes the transmission characteristics of HF channel, and fixes on the system modulation scheme 2dpsk, according to the comparison of ASK, FSK and PSK (DPSK).
首先，本文分析了短波信道的传输特性，并通过比较A SK、FSK和PS K (DPSK)几种调制方式的特点，确定了2dpsk为系统的调制方案。
In HF channel modeling, doppler spread effects are usually simulated by filtering white Gaussian noise. The signal correlation in time domain deviates far from the theoretical value.
在短波信道建模中，通常采用对高斯白噪声滤波来仿真多普勒扩展效应，这些模型的时域相关值与理论值相差较大。
In this paper, a DSP-based HF channel simulator within audio bandwidth is designed and implemented based on the concerned theory on the effects caused by the ionosphere in radio wave.
根据电离层影响无线电波传输的有关理论，本文设计并实现了一种基于DSP的话音带宽短波信道模拟器。
Although narrowband models of the HF channel have existed for many years, with the development of the HF communication they are not applicable to the complex wideband HF channel conditions.
尽管短波窄带信道模型已经诞生了几十年，但是随着短波通信向宽带化发展，它已经不能适应复杂的短波宽带信道条件。
The classic analysis of high-frequency (HF) protection only takes account of the channel delay effect of HF signal, neglects the delay effect of electric traveling wave.
高频保护传统分析方法仅考虑高频信号在通道中的延时效应，没有分析电气量的行波延时效应。
The Effects of Time-varying Ionospheric Channel on HF Timing.
电离层信道的时变特性对短波授时的影响。
This paper mainly fulfills realizing the real Time Channel Estimate (RTCE) Technology of adaptive High-Frequency (HF), which is one of the digital businesses.
本文主要完成数字化业务中的一项——高频自适应中实时信道估值技术(RTCE)的实现。
The mapping relation can be used to predict the critical frequency and the HF communication channel.
人工神经网络的映射能力是人工神经网络理论研究中最重要的问题之一。
The mapping relation can be used to predict the critical frequency and the HF communication channel.
人工神经网络的映射能力是人工神经网络理论研究中最重要的问题之一。
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