Path loss model for coupling loop interference with multiple reflections over single frequency network

Jeon, Seongmin; Yim, Zungkon; Seo, Jong-Soo

doi:10.4103/0256-4602.105006

Cited by 7 publications

(4 citation statements)

References 7 publications

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“…Successive interference cancellation (SIC) technology is applied in NOMA systems to effectively eliminate signal interference among users. With the increase in the number of multiplexed users, the SIC decoding process becomes very complicated [7]. Therefore, the upper limit of users carried on each resource block is defined as A.…”

Section: Maritimementioning

confidence: 99%

“…The radio communications sector of the international telecommunication union (ITU-R) model fails to consider sea surface reflection and other complex marine environmental factors [6]. Previous studies [7] have modified the classic Okumura-Hata model by considering the sparse distribution of scattering in the context of vast ocean areas. The Longley-Rice model (also known as ITM) includes marine environment and climate factors and the deployment of antennas [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Optimization Algorithms for Joint Power and Sub-Channel Allocation for NOMA-Based Maritime Communications

Zhou

2021

Entropy

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This paper investigates resource optimization schemes in a marine communication scenario based on non-orthogonal multiple access (NOMA). According to the offshore environment of the South China Sea, we first establish a Longley–Rice-based channel model. Then, the weighted achievable rate (WAR) is considered as the optimization objective to weigh the information rate and user fairness effectively. Our work introduces an improved joint power and user allocation scheme (RBPUA) based on a single resource block. Taking RBPUA as a basic module, we propose three joint multi-subchannel power and marine user allocation algorithms. The gradient descent algorithm (GRAD) is used as the reference standard for WAR optimization. The multi-choice knapsack algorithm combined with dynamic programming (MCKP-DP) obtains a WAR optimization result almost equal to that of GRAD. These two NOMA-based solutions are able to improve WAR performance by 7.47% compared with OMA. Due to the high computational complexity of the MCKP-DP, we further propose a DP-based fully polynomial-time approximation algorithm (DP-FPTA). The simulation results show that DP-FPTA can reduce the complexity by 84.3% while achieving an approximate optimized performance of 99.55%. This advantage of realizing the trade-off between performance optimization and complexity meets the requirements of practical low-latency systems.

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Section: Maritimementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization Algorithms for Joint Power and Sub-Channel Allocation for NOMA-Based Maritime Communications

Zhou

2021

Entropy

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“…In Fig. 1, it is also assumed that S → R, S → D, R → D and R → R links [20] for the k th frame have (quasi‐static) frequency‐selective fading channels. The associated channel impulse response (CIR) of

{bold-italich}_{i}^{k}

for i = 1, 2, 3, 4 is

{bold-italich}_{i}^{k} = false[h_{i}^{k} false(0 false), \dots, h_{i}^{k} false(L_{i} - 1 false) false]^{normalT}

, where L i is the channel length.…”

Section: Distributed Stbc Rule For D‐stbc‐fdr Systemmentioning

confidence: 99%

Cooperative space‐time block coded full‐duplex relaying over frequency‐selective channel

et al. 2015

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“…where L is the total number of paths, and τ l and h l are the delay and the complex gain of the l-th path, respectively [16].…”

Section: System Descriptionmentioning

confidence: 99%

Performance and Stability Analysis of Echo Cancellers Based on Training Sequences

Zabini

Mazzotti

Dardari

et al. 2014

IEEE Trans. on Broadcast.

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We analyze a two-stage echo cancellation technique for on-channel repeaters (OCRs) based on the reconstruction of the coupling channel impulse response via digital filtering. The estimation of the coupling channel between the transmitting and the receiving antennas is achieved through the injection in the repeated signal of locally generated low-power pseudonoise sequences or trains of short pulses. The analytical model developed in this paper permits the investigation of some important performance figures, such as the mean rejection ratio, the echo suppression and the echo suppression at nominal position. In addition, a new analytical framework dealing with canceller stability issues, arising due to the non perfect echo cancellation, is derived. Specifically, an upper bound on the probability of instability of the canceller is provided. As shown in the numerical results, this framework permits the identification of the main OCR design guidelines. Finally, we will validate our analytical models by showing their accordance with the experimental measurements realized with the OCR prototypes we developed.

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Path loss model for coupling loop interference with multiple reflections over single frequency network

Cited by 7 publications

References 7 publications

Optimization Algorithms for Joint Power and Sub-Channel Allocation for NOMA-Based Maritime Communications

Optimization Algorithms for Joint Power and Sub-Channel Allocation for NOMA-Based Maritime Communications

Cooperative space‐time block coded full‐duplex relaying over frequency‐selective channel

Performance and Stability Analysis of Echo Cancellers Based on Training Sequences

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