实验结果表明，该实验模型基本上反映了短波信道的特点。
The experimental results show that the model responses illustrate basically the characteristics of a HF link.
并对几种方案在不同误差特性状态下的短波信道中应用的结果进行了评估。
The results of several schemes applied in short wave channels of different error features are also evaluated.
考虑到短波信道频率偏移的不确定性提出了相关搜索、FFT捕获的信号捕获方案。
Considering the uncertainty of frequency excursion, the scheme of signal capturing of correlate searching, FFT capturing is bring forward.
从该电子密度模式和电离层波传播特性出发确定多径分量，计算短波信道相干带宽。
The coherence bandwidth of shortwave channel is calculated by using the density profile and wave propagation features in ionosphere.
首先，根据短波信道的特点，分析了其对信号传输的影响，给出了等效基带传输模型。
First, according to the characteristics of HF channels, its influence on signal transmission is analyzed, and the equivalent baseband model of HF channels is provided.
论证了软判决译码对短波信道性能的改善，给出几种复杂程度较低的实用软判决编译码方案。
The soft judgment decoding which improves the features of short wave channels is elaborated. Several less complicated practical soft judgment decoding schemes are given.
路由协议通常使用较多的短报文进行路由的产生和维护，路由效率较低，不适合在超短波信道上运行。
Routing protocol usually use short packets to find out and maintain the routing information, which leads to the low efficiency. Thus it dose not fit the channel.
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。
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.
利用计算机实现短波信道传输的莫尔斯信号的自动检测和识别就可以减轻相关人员的劳动负担，改善工作环境。
Realizing short Morse automatic detection and recognition by computer can lighten relevant people's burden and improve their work environment.
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 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.
该体制具有较高的频率利用率，可有效地抑制短波信道中多径时延、频率选择性衰落、人为干扰与噪声带来的不利影响。
This new scheme has the advantages of high spectrum efficiency and suppression of multipath spread, frequency selective fading, jamming and noise.
根据短波信道的特点，抗多径干扰是主要的一个议题，由多径效应引起的码间串扰严重影响了短波数据传输的质量，所以有效的消除码间串扰非常重要。
It has a good performance in dealing with multi-path disturbance and Inter Symbol Interference(ISI), it has been applied broadly in the transmission of high-speed data.
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。
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).
提出了一种适应于短波窄带信道的自同步音频水印算法。
This article presents a novel self-synchronizing audio watermark algorithm for shortwave narrow band channel.
电离层信道的时变特性对短波授时的影响。
The Effects of Time-varying Ionospheric Channel on HF Timing.
现代短波通信系统，其信道大多数具有频率的选择性，多径传输产生了信号的相干衰落与符号干扰。
In modern shortwave communication systems, the channels are mostly frequency-selective, multipath transmission causes the coherent attenuation and symbol interference.
宽带侦收是短波段中电子侦收的趋势，而其中信道化技术是关键环节。
The trend of electronic reconnaissance in short wave is wide band reconnaissance, and channelized technology is the key of it.
高频信道的变参性以及时间弥散特性严重影响短波数据传输的性能。
The performance of HF data transmission systems is badly constrained by the HF channels what are characterized by the rapid time variation and dispersion.
仿真结果表明，本文所提出的短波盲信道快速分析算法的分离精度和信道正确分离率都较高、抗噪声干扰能力强。
Simulation results show that the proposed blind channel algorithm is of high separation precision, high right separation rate and stronger anti-noise-interference ability.
实验结果表明：编制短波MODEM的通信程序，实现实际信道数据对通，解决了短波数传中存在的几个问题。
As shown by the results of experiments, the communication procedures worked out between SW MODEM and computer serial port can realize data transmission in factual channel.
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。
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.
在短波通信系统中，由于多径效应常常引起信道衰落，直接结果是码间串扰非常严重。
In shortwave communication system, Intersymbol Interference is serious and signal is distorted extremely because of fading channel resulted in by the effect of multipath.
短波宽带接收机是短波接收领域近年来研究的热点，接收信道化处理则是其中一个非常重要的环节。
The HF Broadband receiver is a focus of research in the domain of HF receiving in recent years, and the receivers channelization is one of the very important parts.
传统短波宽带接收机以硬件划分信道为主，无法实时处理大量的宽带信号。
The traditional HF broadband receiver mainly USES the hardware for channelization, and can "t process many broadband signals timely."
仿真试验表明，该分离算法能对短波盲信道进行有效分离，具有分离精度高，抗噪声干扰能力强的优点。
Simulation results show that the proposed SW blind channel separation algorithm is of high separation precision and stronger anti-noise-interference ability.
网络信道基于跳频和扩频超短波电台。
Network channel is base on frequency hopping and spectrum spread radio stations.
结果表明：在短波衰落信道上进行数据传输时采用软判决检测可以大大提高系统性能。
According to the result of data error code experiment, white noise experiment and SW communication on spot experiment, the quantitative analysis of soft judgment detection on SW signal is presented.
提出在短波通信中利用发射端窄波束，在空间上将能量集中于主路径且抑制其他路径来改善多径信道环境；
The authors propose a method of using transmit narrow-beam to spatially concentrate the radiation energy on dominant path and suppress undesired paths in the shortwave communication.
提出在短波通信中利用发射端窄波束，在空间上将能量集中于主路径且抑制其他路径来改善多径信道环境；
The authors propose a method of using transmit narrow-beam to spatially concentrate the radiation energy on dominant path and suppress undesired paths in the shortwave communication.
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