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Harris Corporation is conducting a series of investigations in which network simulations are used to characterize and analyze the performance of existing HF communications waveforms and protocols, and to develop and optimize innovative techniques realizing improved network throughput, capacity, and user experience. The work reported in this paper includes development of HF physical layer models providing...
Emerging approaches to HF communications aim to increase the range of missions and applications HF can support by using higher bandwidths to achieve higher on-air data rates and/or improved communications robustness. Current proposals achieve this in either of two ways: by (i) increasing the bandwidth allocated to a single-carrier modulated waveform, to up to 24 kHz (or possibly higher), or (ii) using...
The data link protocol HDL+, which has been proposed for incorporation into NATO STANAG 4538, employs an innovative combination of Type II Hybrid-ARQ techniques with real-time adaptation of signal constellation and code rate to achieve high throughput performance under a wide variety of channel conditions. The ionospheric HF channels for which HDL+ was designed exhibit important variations in channel...
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