QAM and PSK modulation performance analysis over narrow band HF channel

Ismail, Ahmad Fadzil; Mohamed-pour, Kamal

doi:10.1080/15567036.2019.1649329

Cited by 4 publications

(10 citation statements)

References 4 publications

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“…The second part of the data is 4 bits and it is modulated using 16-PSK and it is assigned a power between 10 and 13 dB 16-PSK. The used schemes and power levels are based on the performance analysis done in [10]. The two data parts are sent over the same channel but with different power levels and this is known as power domain nonorthogonal multiple access (NOMA).…”

Section: Resultsmentioning

confidence: 99%

“…It was proven in Ismail at el paper [10] that the maximum constellation over narrowband 3 kHz HF channel is 32 QAM by using maximum practical power (30 dB). It is known that constellations are a power of 2 so what was tested is actually 32 QAM and 64 QAM.…”

Section: 𝑅 = 𝐵(𝑙𝑜𝑔mentioning

confidence: 99%

“…Although the bit rate has been increased in Catherine et al work, the maximum constellation is not specified and it was proven by Ismail et al in his paper [10] that the 256 QAM used by Catherine et al in 3 kHz channel is unpractical.…”

Section: Introductionmentioning

confidence: 99%

“…Ismail et al in their work [10] studied the performance of QAM and PSK modulation schemes over the available 3 KHz Narrowband channel. The analysis determined the suitable amount of symbols and needed power for the narrowband channel in each of the used modulation schemes.…”

Section: Introductionmentioning

confidence: 99%

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Performance Study of HF communication using NOMA over Narrowband HF Channel

Ismail

Mohamed-pour

2022

Preprint

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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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Section: Resultsmentioning

confidence: 99%

Section: 𝑅 = 𝐵(𝑙𝑜𝑔mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Study of HF communication using NOMA over Narrowband HF Channel

Ismail

Mohamed-pour

2022

Preprint

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“…In addition, Ismail [21] studies narrowband modulations with 3 kHz of bandwidth to analyse the performance of each modulation. In our work, we compare the robustness of two narrowband modulations real tested in comparison to a multicarrier modulation designed taking into account the NVIS channel effects measured.…”

Section: Introductionmentioning

confidence: 99%

Study of NVIS Channel for USN Protocol Definition in Antarctica

et al. 2020

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Every year, the number of ubiquitous sensor networks (USN) is increasing and the need for remote USN communications is emerging in some scenarios. As an alternative to satellite communications, more interests are focused on high frequencies (HF) communications as a low-cost option to reach links of more than 250 km without a line of sight. The HF standards are designed for generic communication channels being not robust for near vertical incidence skywave (NVIS) USN. In this article, we propose a new protocol for USN in remote places based on NVIS communications. For that purpose, we study the main characteristics of the NVIS channel with the presence of groundwaves, particularly in Antarctica. We analyze the availability of the channel, the height of the layers, the delay spread, and the Doppler spread. On the basis of the results obtained, we propose two protocols based on an OFDM (orthogonal frequency division multiplexing) modulation depending on the presence of the groundwave at the receiver. Finally, we make a simulation of the two OFDM configurations and we compare it with real tested standard modulations. The results show a better performance of the new protocol compared to the current HF standards.

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Performance study of HF communication using NOMA over narrowband HF channel

Ismail

Mohamed-pour

2023

IET Communications

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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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QAM and PSK modulation performance analysis over narrow band HF channel

Cited by 4 publications

References 4 publications

Performance Study of HF communication using NOMA over Narrowband HF Channel

Performance Study of HF communication using NOMA over Narrowband HF Channel

Study of NVIS Channel for USN Protocol Definition in Antarctica

Performance study of HF communication using NOMA over narrowband HF channel

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