scholarly journals Reconfigurable intelligent surfaces assisted wireless communication networks: ergodic capacity and symbol error rate

2022 ◽  
Vol 25 (1) ◽  
pp. 358
Author(s):  
Dinh-Thuan Do ◽  
Chi-Bao Le
Keyword(s):  
Monte Carlo ◽  
Communication Networks ◽  
Error Rate ◽  
System Performance ◽  
Performance Metrics ◽  
Ergodic Capacity ◽  
Symbol Error Rate ◽  
Base Station ◽  
Wireless Communication Networks ◽  
Relaying System

By enabling reconfigurable intelligent surfaces (RIS), we can deploy intelligent reflecting signals from the base station to destinations. Different from traditional relaying system, RIS relies on programmable metasurfaces and mirrors to improve system performance of destinations. We derive the formulas of main system performance metrics such as ergodic capacity and symbol error rate (SER). Based on types of modulation, we need to demonstrate other parameters which make influence to system performance. We show analytically that the number of reflecting elements along with the transmit power at the source can improve system performance. Moreover, we check the exactness of derived expressions by matching Monte-Carlo with analytical simulations. Finally, we find the best performance can be achieved at specific parameters and results are verified by explicit simulations.

Ergodic Capacity and Symbol Error Rate Analysis of a Wireless System with α-μ Composite Fading Channel

2021 ◽  
Author(s):  
Fereshteh salimian rizi ◽  
Abolfazl Falahati
Keyword(s):  
Error Rate ◽  
Fading Channel ◽  
Communication Systems ◽  
Large Scale ◽  
Scale Effects ◽  
Ergodic Capacity ◽  
Symbol Error Rate ◽  
Performance Criteria ◽  
Rate Analysis ◽  
New Generation

Abstract A composite α-µ/Lognormal fading channel is proposed with several channel performance criteria. This model considers the most effective occurrences in a fading channel, mainly non-linearity, multi-cluster nature of propagation medium, and shadowing effects. The new generation of communication systems is moving towards the use of millimetre waves (mmW). In this type of propagation, large-scale effects of fading channel on the received signal are significant, so in the proposed composite model, the lognormal distribution is considered to model large-scale effects of fading, which is the most accurate distribution to model shadowing. The Gaussian-Hermite quadrature sum is used to approximate the probability distribution function (PDF) of the proposed model. After calculating the statistics, the symbol error rate (SER) and ergodic capacity are computed. The Mellin transform technique is used to calculate the SER expression of different modulation schemes; then, ergodic capacity is computed for a diverse frequency spectrum. Finally, the Monte Carlo method is used to evaluate the analyses.

Outage Performance of Multiuser AF Two-Way Relaying with Asymmetric Traffic Requirements over Nakagami-m Fading

2014 ◽  
Vol 556-562 ◽  
pp. 4530-4535
Author(s):  
Shi He ◽  
Bing Gao ◽  
Zhang Jun Fan
Keyword(s):  
Monte Carlo ◽  
Outage Probability ◽  
Fading Channels ◽  
Base Station ◽  
Diversity Order ◽  
Amplify And Forward ◽  
Relay System ◽  
Outage Performance ◽  
Shed Light ◽  
Relaying System

In this paper, we investigate the outage performance of a multiuser two-way relaying system over Nakagami-m fading channels. In particular, we consider the amplify-and-forward (AF) relay system with beamforming at the base station. Furthermore, the base station and mobile users have asymmetric traffic requirements. We fist derive a tight lower bound for the outage probability (OP). Moreover, the asymptotic outage probability expression is derived to shed light on the system's diversity order. Finally, Monte Carlo simulations are conducted to verify the analytical results.

Call-Level Performance Analysis of a Power Line Communication Network Under Disturbance

2011 ◽  
Vol 12 (3) ◽  
Author(s):  
Shensheng Tang ◽  
Yi Xie
Keyword(s):  
Communication Networks ◽  
Orthogonal Frequency Division Multiplexing ◽  
Performance Metrics ◽  
Steady State Solution ◽  
Power Line ◽  
Base Station ◽  
Channel Noise ◽  
Power Line Communication ◽  
Proposed Model ◽  
Level Performance

Power line communication (PLC) is a promising technique for information transmission using existing power lines. We analytically model a finite-source PLC network subject to channel noise (disturbance) and evaluate its call-level performance through a queueing theoretic framework. The proposed PLC network model consists of a base station (BS), which is located at a transformer station and connected to the backbone communication networks, and a number of subscriber stations that are interconnected with each other and with the BS via the power line transmission medium. An orthogonal frequency division multiplexing based transmission technique is assumed to be used for providing the transmission channels in a frequency spectrum. The channels are subject to failure during service due to disturbance. We determine the steady-state solution of the proposed model and derive a set of performance metrics of interest. Numerical and simulation results are presented to show the derived metrics with respect to different system parameters. The proposed modeling method can be used for evaluation and design of future PLC networks.

scholarly journals No-Regret Matching Game Algorithm for NOMA Based UAV-Assisted NB-IoT Systems

2021 ◽  
Vol 26 (1) ◽  
pp. 79-85
Author(s):  
Samar Shaker Metwaly ◽  
Ahmed. M. Abd El-Haleem ◽  
Osama El-Ghandour
Keyword(s):  
Communication Networks ◽  
Multiple Access ◽  
Learning Algorithm ◽  
Base Station ◽  
Throughput Capacity ◽  
System Capacity ◽  
Wireless Communication Networks ◽  
Total Rate ◽  
Small Base ◽  
Matching Game

NB-IoT is the standardized technology for machine type communication (MTC) in Long Term Evolution (LTE). NB-IoT can achieve IoT requirements nevertheless, it suffers a low rate and capacity. On the other hand, Unmanned aerial vehicles (UAV) and Non-Orthogonal Multiple Access (NOMA) are promising technology used to enhance the throughput, capacity, and coverage of wireless communication networks. In this paper, we propose a heterogeneous network scenario where a UAV small Base Station (UBS) is used to assist the LTE Macro Base Station (MBS) with the help of the Non-Orthogonal Multiple Access technique to solve the NB-IoT throughput and capacity issues. Matching game based no-regret learning algorithm is proposed to optimize the NB-IoT device association and using NOMA pairing at each base station to provide the maximum system total rate and capacity. Simulation results show that our proposed scheme increases the total rate of the system by 60% and the system capacity by at least 80%, compared to NOMA without UAV and the total rate and capacity of the system by 200% and 85% respectively, with OMA scheme.

scholarly journals Performance Evaluation of UAV-Based NOMA Networks with Hardware Impairment

Electronics ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 94
Author(s):  
Chung Ho Duc ◽  
Sang Quang Nguyen ◽  
Chi-Bao Le ◽  
Ngo Tan Vu Khanh
Keyword(s):  
System Performance ◽  
Performance Metrics ◽  
Signal To Noise Ratio ◽  
Ergodic Capacity ◽  
High Signal ◽  
Performance Loss ◽  
Hardware Impairments ◽  
Asymptotic Expressions ◽  
Aerial Vehicle ◽  
Hardware Impairment

In this paper, we evaluate the outage performance of a non-orthogonal multiple access (NOMA)-enabled unmanned aerial vehicle (UAV) where two users on the ground are simultaneously served by a UAV for a spectral efficiency purpose. In practice, hardware impairments at the transceiver cause distortion noise, which results in the performance loss of wireless systems. As a consequence, hardware impairment is an unavoidable factor in the system design process. Hence, we take into account the effects of hardware impairment (HI) on the performance of the proposed system. In this setting, to evaluate the system performance, the closed-form expressions of the outage probability of two NOMA users and the ergodic capacity are derived as well as their asymptotic expressions for a high signal-to-noise ratio (SNR). Finally, based on Monte-Carlo simulations, we verify the analytical expressions and investigate the effects on the main system parameters, i.e., the transmit SNR and level of HI, on the system performance metrics. The results show that the performance for the near NOMA user is better than of that for the far NOMA user in the case of perfect hardware; however, in the case of hardware impairment, an inversion happens at a high transmit power of the UAV in terms of the ergodic capacity.

scholarly journals Performance Analysis of Hard-Switching Based Hybrid FSO/RF System over Turbulence Channels

Computation ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 28 ◽  
Author(s):  
Hira Khalid ◽  
Sajid Sheikh Muhammad ◽  
Hector E. Nistazakis ◽  
George S. Tombras
Keyword(s):  
Communication Networks ◽  
Signal To Noise Ratio ◽  
Ergodic Capacity ◽  
Numerical Comparison ◽  
Wireless Communication Networks ◽  
High Data ◽  
Data Rates ◽  
Turbulence Effect ◽  
Increasing Demand ◽  
Alternative Good

The hybrid system of free space optic (FSO) and radio frequency (RF) has come forth as alternative good solution for increasing demand for high data rates in wireless communication networks. In this paper, wireless networks with hard-switching between FSO and RF link are analyzed, assuming that at a certain time point either one of the two links are active, with FSO link having higher priority. As the signal-to-noise ratio (SNR) of FSO link falls below a certain selected threshold, the RF link is activated. In this work, it is assumed that the FSO link follows Gamma-Gamma fading due to the atmospheric turbulence effect whereas RF link experiences Rayleigh fading. To analyze the proposed hybrid model, analytical expressions are derived for the outage probability, bit error rate and ergodic capacity. A numerical comparison is also done between the performances of the proposed hybrid FSO/RF model and the single FSO model.

Multiuser Detection schemes based on families of OMP and MUSIC algorithms for Uplink Grant free NOMA Wireless communications systems

2020 ◽  
Vol 10 ◽  
Author(s):  
Olutayo O. Oyerinde
Keyword(s):  
Communication Networks ◽  
Matching Pursuit ◽  
Base Station ◽  
Wireless Communication Networks ◽  
Multiple Measurement Vectors ◽  
Multiuser Detector ◽  
Access Scheme ◽  
Successful Recovery ◽  
Multi Access ◽  
Wireless Communications Systems

The non-orthogonal multiple access (NOMA) technology is a multi-access scheme that overcomes most of the disadvantages of its predecessor, the OMA technology. Specifically, NOMA technology supports massive connectivity of multiple users by employing the same non-orthogonal spectrum resource. In an uplink NOMA system with grant-free transmission mode, the base station (BS) is unaware of which users are active in the networks at a given time. Consequently, there is a need for mechanism to ensure successful recovery of users’ transmitted signals. This paper presents some new multiuser detector (MUD) schemes for uplink grant-free NOMA wireless communication networks with system’s model involving multiple measurement vectors (MMV) rather than the single measurement vector (SMV) that many previous works have considered. These MUDs include those that are based on differential orthogonal matching pursuit (OMP), adaptive simultaneous OMP (SOMP), compressive-multiple signal classification (MUSIC), and sequential compressive-MUSIC algorithms. The MUDs are employed in the detection of users’ signals in the uplink NOMA systems. Comparative performances of these MUDs with another one that is also based on the MMV system model, the SOMP-based MUD are presented for the scenarios when the system is under-loaded, fully loaded and over-loaded. The results suggest that the sequential compressive-MUSIC-based MUD, though shows weak performance at lower range of SNR, outperforms all the other MUDs including the SOMP-based MUD at higher SNR. Its performance is quite outstanding during the over-loaded scenarios, especially at higher SNR. However, its computational complexity is higher that the closely performing compressive-MUSIC-based MUD and SOMP-based MUD.

scholarly journals Intercell Interference Coordination through Limited Feedback

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Lingjia Liu ◽  
Jianzhong (Charlie) Zhang ◽  
Jae-Chon Yu ◽  
Juho Lee
Keyword(s):  
Wireless Communication ◽  
Communication Networks ◽  
Limited Feedback ◽  
Base Station ◽  
Base Stations ◽  
System Level ◽  
Wireless Communication Networks ◽  
Interference Coordination ◽  
Average Cell ◽  
Intercell Interference

We consider the applications of multicell transmission schemes to the downlink of future wireless communication networks. A multicell multiple-input multiple output-(MIMOs) based scheme with limited coordination among neighboring base stations (BSs) is proposed to effectively combat the intercell interference by taking advantage of the degreesoffreedom in the spatial domain. In this scheme, mobile users are required to feedback channel-related information to both serving base station and interfering base station. Furthermore, a chordal distance-based compression scheme is introduced to reduce the feedback overhead. The performance of the proposed scheme is investigated through theoretical analysis as well as system level simulations. Both results suggest that the so-called “intercell interference coordination through limited feedback” scheme is a very good candidate for improving the cell-edge user throughput as well as the average cell throughput of the future wireless communication networks.

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