scholarly journals Outage Performance of Relay-Assisted Single- and Dual-Stage NOMA Over Power Line Communications

2021 ◽  
Author(s):  
ROOPESH RAMESH ◽  
Sanjeev Gurugopinath ◽  
sami muhaidat
Keyword(s):  
Closed Form ◽  
Communication Systems ◽  
Multiple Access ◽  
Optimization Problems ◽  
Power Line ◽  
Closed Form Solutions ◽  
Power Line Communications ◽  
Optimal Power ◽  
Dual Stage ◽  
Outage Probabilities

<p>In this paper, we analyze the performance of relay-assisted, single-stage (SS) non-orthogonal multiple access (NOMA) and dual-stage (DS) NOMA power line communication systems. Specifically, derive closed form expressions for the outage probabilities of the SS NOMA and DS NOMA schemes. Subsequently, we formulate optimization problems and obtain closed-form solutions for the optimal power allocation coefficients of the SS NOMA and DS NOMA scheme, such that the probability of overall outage is minimized. The accuracy of our analysis and the tightness of the approximations employed are validated through Monte Carlo simulations and numerical techniques. Moreover, we show that the DS NOMA scheme outperforms the SS NOMA scheme, in terms of the overall outage probability.</p>

scholarly journals Outage Performance of Relay-Assisted Single- and Dual-Stage NOMA Over Power Line Communications

2021 ◽  
Author(s):  
ROOPESH RAMESH ◽  
Sanjeev Gurugopinath ◽  
sami muhaidat
Keyword(s):  
Closed Form ◽  
Communication Systems ◽  
Multiple Access ◽  
Optimization Problems ◽  
Power Line ◽  
Closed Form Solutions ◽  
Power Line Communications ◽  
Optimal Power ◽  
Dual Stage ◽  
Outage Probabilities

<p>In this paper, we analyze the performance of relay-assisted, single-stage (SS) non-orthogonal multiple access (NOMA) and dual-stage (DS) NOMA power line communication systems. Specifically, derive closed form expressions for the outage probabilities of the SS NOMA and DS NOMA schemes. Subsequently, we formulate optimization problems and obtain closed-form solutions for the optimal power allocation coefficients of the SS NOMA and DS NOMA scheme, such that the probability of overall outage is minimized. The accuracy of our analysis and the tightness of the approximations employed are validated through Monte Carlo simulations and numerical techniques. Moreover, we show that the DS NOMA scheme outperforms the SS NOMA scheme, in terms of the overall outage probability.</p>

scholarly journals SWIPT-Aware Fog Information Processing: Local Computing vs. Fog Offloading

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3291 ◽  
Author(s):  
Haina Zheng ◽  
Ke Xiong ◽  
Pingyi Fan ◽  
Li Zhou ◽  
Zhangdui Zhong
Keyword(s):  
Information Processing ◽  
Closed Form ◽  
Optimization Problems ◽  
Fog Computing ◽  
Mode Selection ◽  
Optimization Theory ◽  
Access Point ◽  
Power Splitting ◽  
Closed Form Solutions ◽  
Processing Modes

This paper studies a simultaneous wireless information and power transfer (SWIPT)-aware fog computing by using a simple model, where a sensor harvests energy and receives information from a hybrid access point (HAP) through power splitting (PS) receiver architecture. Two information processing modes, local computing and fog offloading modes are investigated. For such a system, two optimization problems are formulated to minimize the sensor’s required power for the two modes under the information rate and energy harvesting constraints by jointly optimizing the time assignment and the transmit power, as well as the PS ratio. The closed-form and semi-closed-form solutions to the proposed optimization problems are derived based on convex optimization theory. Simulation results show that neither mode is always superior to the other one. It also shows that when the number of logic operations per bit associated with local computing is less than a certain value, the local computing mode is a better choice; otherwise, the fog offloading mode should be selected. In addition, the mode selection associated with the positions of the user for fixed HAP and fog server (FS) is also discussed.

scholarly journals Exploiting non-orthogonal multiple access in device-to-device communication

2021 ◽  
Vol 22 (2) ◽  
pp. 919
Author(s):  
Sang Hoon Lee ◽  
Soo Young Shin
Keyword(s):  
Closed Form ◽  
Interference Cancellation ◽  
Multiple Access ◽  
D2d Communication ◽  
System Capacity ◽  
Time Sharing ◽  
Sum Capacity ◽  
Closed Form Solutions ◽  
Device To Device ◽  
Device To Device Communication

This paper proposes an uplink non-orthogonal multiple access (NOMA) system with device-to-device (D2D) communication, enabling NOMA users to communicate with other users/devices using D2D communication to improve the system capacity. In the NOMA-D2D system, two cellular users communicated with the BS using uplink NOMA, and two cellular users simultaneously communicated with the D2D users using downlink NOMA. Closed-form solutions for the ergodic sum capacity of the proposed system are derived analytically. The analytical results are validated via simulations and they are compared with the results obtained from conventional schemes. The comparison shows that, in scenarios where efficient interference cancellation can be achieved, the proposed NOMA system with the D2D model can achieve higher capacity gains than conventional benchmark schemes. When  dB, NOMA-D2D achieves capacity gains of 192.2% and 157.5% over the conventional OMA and the time-sharing-based NOMA, respectively.

Closed-form solutions to a class of H∞-optimization problems

1994 ◽  
Vol 60 (1) ◽  
pp. 41-70 ◽  
Author(s):  
ALI SABERI ◽  
BEN M. CHEN ◽  
ZONGLI LIN
Keyword(s):  
Closed Form ◽  
Optimization Problems ◽  
Closed Form Solutions

Compressed Sensing Aided Channel Estimation for Power Line Communications

2014 ◽  
Vol 1046 ◽  
pp. 281-284 ◽  
Author(s):  
Xuan Liu ◽  
Da Peng Lin ◽  
Ye Shen He
Keyword(s):  
Channel Estimation ◽  
Compressed Sensing ◽  
Communication Systems ◽  
Sampling Rate ◽  
Power Line ◽  
Random Projections ◽  
Power Line Communication ◽  
Power Line Communications ◽  
Pilot Symbols ◽  
Estimation Scheme

In this paper, we address a channel estimation scheme for power line communication systems based on compressed sensing techniques. With the properly designed pilot symbols, the received signals at the receiver can be reconstructed from a set of random projections, benefiting from a reduced sampling rate. Moreover, we propose a novel channel estimation structure for PLC systems, which can be applied for appropriate system design. Eventually, simulation results demonstrate that the proposed algorithm outperforms other algorithms and reduces the sample rate significantly.

scholarly journals A novel-iterative simulation method for performance analysis of non-coherent FSK/ASK systems over Rice/Rayleigh channels using the wolfram language

2016 ◽  
Vol 13 (2) ◽  
pp. 157-174 ◽  
Author(s):  
Vladimir Mladenovic ◽  
Danijela Milosevic
Keyword(s):  
Closed Form ◽  
Communication Systems ◽  
Rayleigh Fading ◽  
Simulation Method ◽  
Rician Fading ◽  
New Approach ◽  
Closed Form Solutions ◽  
Numerical Tools ◽  
The Impact ◽  
Insight Into

In this paper, a new approach in solving and analysing the performances of the digital telecommunication non-coherent FSK/ASK system in the presence of noise is derived, by using a computer algebra system. So far, most previous solutions cannot be obtained in closed form, which can be a problem for detailed analysis of complex communication systems. In this case, there is no insight into the influence of certain parameters on the performance of the system. The analysis, modelling and design can be time-consuming. One of the main reasons is that these solutions are obtained by utilising traditional numerical tools in the shape of closed-form expressions. Our results were obtained in closed-form solutions. They are resolved by the introduction of an iteration-based simulation method. The Wolfram language is used for describing applied symbolic tools, and SchematicSolver application package has been used for designing. In a new way, the probability density function and the impact of the newly introduced parameter of iteration are performed when errors are calculated. Analyses of the new method are applied to several scenarios: without fading, in the presence of Rayleigh fading, Rician fading, and in cases when the signals are correlated and uncorrelated.

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