Improved error correction for Stanag 4539 appendix H proposal: HF XL

2023

IET Communications

High frequency systems (HF) are still used in many communication applications. Data can be sent for hundreds of kilometers at a low power cost with only one drawback, low bitrate. To increase the bitrate, several methods were reported using the single‐Tone modulation with 24 kHz bandwidth, but still not practical in real‐time applications because, the 24 kHz is unavailable due to the instability of the ionosphere layer. In this work, we propose a structured method built on the Non‐Orthogonal Multiple Access technique (NOMA) to increase the bit rate per HF narrowband channel. To increase the data rate, two parts of the data are divided and sent to one user over two different power levels. We use the NOMA technique on the receiver's side to recognize the two parts of data. The results show a significant improvement (up to 45%) using NOMA in narrowband 3 kHz channels. The bit rate at the receiver has increased up to 200 Kb/s concerning, while the maximum bit rate recorded by conventional methods used in previous studies is 138 Kb/s. The system is built on the SDR platform and tested in multiple channels, weather, and power conditions in real‐time experiments to validate its reliability.

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Section: Introductionmentioning

confidence: 99%

Performance study of HF communication using NOMA over narrowband HF channel

2023

IET Communications

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“…As a result, available and usable channels decrease dramatically. To overcome the above-mentioned issues and the problem of signal interferences due a large number of users and multipath fading problems, the HF systems usually operate on 3 kHz Narrowband channels [4,5]. HF Communication have progressed over four stages.…”

Section: Introductionmentioning

confidence: 99%

Performance Study of HF communication using NOMA over Narrowband HF Channel

2022

Preprint

HF systems are still important for many communication applications. Data can be sent for a long distance with low cost. One major drawback of them is their low bitrate. The aim of this paper is to increase the bit rate per HF narrowband channel using NOMA. Two parts of Data has been divided and sent for one user over two different power levels. In the receiver side these two parts Data are reorganized using NOMA technique. The results review that using NOMA in a Narrowband 3 kHz channels is reliable. Compared to the maximum rate proofed in previous works using conventional methods, the proposed method increases the rate by 45%. Combined with multichannel algorithms such as HF XL, the total increase in bit rate can be considerable. Results are validated with real experiments. The system is built on SDR plate form and tested in different channel conditions.

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QAM and PSK modulation performance analysis over narrow band HF channel

Energy Sources, Part A: Recovery, Utilization, and Environmenta

2019