Cognitive Radio and Its Applications in the New Trend of Communication System: A Review

Al-Sudani, Haider; Thabit, Ahmed A.; Dalveren, Yaser

doi:10.1109/iiceta54559.2022.9888674

Cited by 6 publications

(5 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…×KN s is the fully digital precoder corresponding to the n-th sub-carrier. If the hybrid beamformer V RF V BB [n] is sufficiently close to the full complexity precoder with considerably high SNR, then the optimization problem (18) becomes equivalent to (17).…”

Section: Source Analog Precoder and Relay Rf Combinermentioning

confidence: 99%

“…Furthermore, assuming V BB [n] as a unitary matrix allows us to transform the problem (18) into another equivalent form as max…”

Section: Source Analog Precoder and Relay Rf Combinermentioning

confidence: 99%

“…To maximize spectrum utilization in B5G wireless networks, it seems crucial to combine the dynamic spectrum allocation strategy with mm-wave transmission. Specifically, novel applications from diverse fields, such as wireless backhaul, the Internet of Things (IoT), and intelligent transportation systems, can be realized by exploiting the adaptability of CR technology combined with the advantages of mm-wave frequencies [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spectral Efficiency Maximization for Mixed-Structure Cognitive Radio Hybrid Wideband Millimeter-Wave Transceivers in Relay-Assisted Multi-User Multiple-Input Multiple-Output Systems

Mustafa,

Baik,

Song

et al. 2024

Sensors

View full text Add to dashboard Cite

This paper proposes a cognitive radio network (CRN)-based hybrid wideband precoding for maximizing spectral efficiency in millimeter-wave relay-assisted multi-user (MU) multiple-input multiple-output (MIMO) systems. The underlying problem is NP-hard and non-convex due to the joint optimization of hybrid processing components and the constant amplitude constraint imposed by the analog beamformer in the radio frequency (RF) domain. Furthermore, the analog beamforming solution common to all sub-carriers adds another layer of design complexity. Two hybrid beamforming architectures, i.e., mixed and fully connected ones, are taken into account to tackle this problem, considering the decode-and-forward (DF) relay node. To reduce the complexity of the original optimization problem, an attempt is made to decompose it into sub-problems. Leveraging this, each sub-problem is addressed by following a decoupled design methodology. The phase-only beamforming solution is derived to maximize the sum of spectral efficiency, while digital baseband processing components are designed to keep interference within a predefined limit. Computer simulations are conducted by changing system parameters under different accuracy levels of channel-state information (CSI), and the obtained results demonstrate the effectiveness of the proposed technique. Additionally, the mixed structure shows better energy efficiency performance compared to its counterparts and outperforms benchmarks.

show abstract

Section: Source Analog Precoder and Relay Rf Combinermentioning

confidence: 99%

“…Furthermore, assuming V BB [n] as a unitary matrix allows us to transform the problem (18) into another equivalent form as max…”

Section: Source Analog Precoder and Relay Rf Combinermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spectral Efficiency Maximization for Mixed-Structure Cognitive Radio Hybrid Wideband Millimeter-Wave Transceivers in Relay-Assisted Multi-User Multiple-Input Multiple-Output Systems

Mustafa,

Baik,

Song

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

“…Therefore, this section of the SN does not play any role in IUI among SUs. Furthermore, R SR can be modeled by the mutual information between s[n] (4) and y r 1 [n] (8) as…”

Section: Proposed Hybrid Beamforming Designmentioning

confidence: 99%

“…This target can be achieved by regulating the transmit power of the SU [7]. From this perspective, it seems crucial to combine the dynamic spectrum allocation framework proposed by cognitive radio networks (CRN) with mm-wave communication to maximize spectrum utilization in B5G wireless cellular systems [8].…”

Section: Introductionmentioning

confidence: 99%

Hybrid Wideband Beamforming for Sum Spectral Efficiency Maximization in Millimeter-Wave Relay-Assisted Multiuser MIMO Cognitive Radio Networks

Abbasi,

Mustafa,

Baik

et al. 2023

Mathematics

View full text Add to dashboard Cite

Relay-assisted hybrid beamforming plays an inevitable role in enhancing network coverage, transmission range, and spectral efficiency while simultaneously reducing hardware cost, power consumption, and hardware implementation complexity. This study investigates a cognitive radio network (CRN)-based hybrid wideband transceiver for millimeter-wave (mm-wave) decode-and-forward (DF) relay-assisted multiuser (MU) multiple-input multiple-output (MIMO) systems. It is worth mentioning that the underlying problem has not been addressed so far, which is a real motivation behind the proposed algorithm. The joint optimization of hybrid processing components and the constant amplitude constraints imposed by the analog beamforming solution make this problem non-convex and NP-hard. Furthermore, the analog beamformer common to all sub-carriers is another challenging aspect of the underlying problem. To derive the frequency-flat analog processing component in the radio frequency (RF) domain and frequency-dependent baseband processing matrices in the baseband domain, the original complicated problem is reformulated as two single-hop sum-rate maximization sub-problems. Taking advantage of this decomposition, the sum spectral efficiency is maximized through RF precoding and combining. On the other hand, the impact of interference among transmitted data streams and inter-user interference (IUI) is minimized via baseband processing matrices. Finally, computer simulations are conducted by changing system parameters, considering both perfect and imperfect channel state information (CSI). Simulation results demonstrate that the proposed algorithm achieves performance close to full-complexity precoding and outperforms other well-known hybrid beamforming techniques. Specifically, more than 95% efficiency is achieved with perfect CSI, and more than 90% efficiency is attained under the assumption of 30% error in the estimated channels.

show abstract

Performance Analysis of Covert Communication for Cooperative Cognitive Radio Networks

Dai

Tie

Shi

et al. 2022

2022 10th International Conference on Information Systems and Computing Technology (ISCTech)

View full text Add to dashboard Cite

Cognitive Radio and Its Applications in the New Trend of Communication System: A Review

Cited by 6 publications

References 45 publications

Spectral Efficiency Maximization for Mixed-Structure Cognitive Radio Hybrid Wideband Millimeter-Wave Transceivers in Relay-Assisted Multi-User Multiple-Input Multiple-Output Systems

Spectral Efficiency Maximization for Mixed-Structure Cognitive Radio Hybrid Wideband Millimeter-Wave Transceivers in Relay-Assisted Multi-User Multiple-Input Multiple-Output Systems

Hybrid Wideband Beamforming for Sum Spectral Efficiency Maximization in Millimeter-Wave Relay-Assisted Multiuser MIMO Cognitive Radio Networks

Performance Analysis of Covert Communication for Cooperative Cognitive Radio Networks

Contact Info

Product

Resources

About