Using wideband High Frequency (WBHF) communication has not been a luxury now due to the urgent need for the transfer of large files over long distances without the need for sophisticated infrastructure. The channel model helps in evaluating the performance of communications systems without the need for a real transmission. The existing HF ITU-R(International Telecommunication Union Radio) channel models are valid only for narrowband channels of bandwidth 3KHz and are valid up to 12KHz. Another channel model for WBHF with bandwidth up to 1MHz was given by Vogler yet, the model was mathematically intractable and allow no further analysis to take place. Noting that, WBHF demands channel bandwidth greater than 12KHz (e.g:24KHz). In this paper, we present a WBHF channel model that is both accurate and mathematically tractable laying the foundation for an informative comparison between different communication systems. The accuracy of the proposed model is first to cross verified against Vogler’s wideband model in terms of the channel impulse response, frequency response and channel scattering characteristics. This comparison leaves our model qualified to evaluate a newly developed standard of HF wideband Waveforms presented to support high data rates and link reliability requirements. Further, we establish a detailed comparison between OFDM and single carrier signaling schemes over the considered WBHF proposed ionospheric channel, under many parameters that affect the performance of both systems. We investigate the justification of using both systems under different channel conditions, we also derive the necessary rate formulas for each signaling scheme and provide simulation environment of both systems on selected samples of the ITU-R channel models for the HF ionospheric channel representing most of the channel conditions. It is coming up that in quiet channel conditions the OFDM outperforms SCCP, while in disturbed conditions SCCP shows more robustness against channel conditions than OFDM. Simulation results are shown that support our analytical results. In addition, we present a Software Defined Radio Hardware implementation of an OFDM wideband HF Transceiver. The developed implementation has been evaluated using an equivalent baseband channel model based on the ITU-R HF channel model.

由于迫切需要长距离传输大型文件而不需要复杂的基础架构，因此使用宽带高频（WBHF）通信现在已经不是一种奢望。信道模型有助于评估通信系统的性能，而无需实际传输。现有的HF ITU-R（国际电信联盟无线电）信道模型仅对带宽为3KHz的窄带信道有效，并在最高12KHz的频率下有效。Vogler给出了另一种带宽高达1MHz的WBHF信道模型，该模型在数学上很难处理，因此无法进行进一步的分析。注意，WBHF要求大于12KHz（例如：24KHz）的信道带宽。在本文中，我们提出了一种准确且在数学上易于处理的WBHF信道模型，为不同通信系统之间的信息比较奠定了基础。首先在信道脉冲响应，频率响应和信道散射特性方面，与Vogler的宽带模型进行交叉验证，证明了所提模型的准确性。这种比较使我们的模型有资格评估为支持高数据速率和链路可靠性要求而提出的最新开发的HF宽带波形标准。此外，在影响两个系统性能的许多参数下，我们在考虑的WBHF建议电离层信道上建立了OFDM和单载波信令方案之间的详细比较。我们研究了在不同的渠道条件下使用两种系统的合理性，我们还推导了每种信令方案所需的速率公式，并在代表大部分信道状况的HF电离层信道的ITU-R信道模型的选定样本上提供了两个系统的仿真环境。可以预见的是，在安静的信道条件下，OFDM的性能优于SCCP，而在受干扰的条件下，SCCP在信道条件方面的表现比OFDM更强。仿真结果表明支持我们的分析结果。此外，我们介绍了OFDM宽带HF收发器的软件定义无线电硬件实现。已使用基于ITU-R HF信道模型的等效基带信道模型对开发的实现方案进行了评估。