scholarly journals BER-Aware Reflecting Elements Allocation for RIS-aided NOMA Networks over Ricean Fading

2022 ◽  
Author(s):  
Krisma Asmoro ◽  
I Nyoman Apraz Ramatryana ◽  
Soo Young Shin
Keyword(s):  
Objective Function ◽  
Bit Error Rate ◽  
Multiple Access ◽  
Rayleigh Fading ◽  
Exhaustive Search ◽  
Search Range ◽  
Ricean Fading ◽  
Simulation Results ◽  
Average User ◽  
Ber Performance

Reconfigurable intelligent surface (RIS) as a supportive technology for aiding downlink non-orthogonal multiple access (NOMA) can enhance the bit error rate (BER) performance. In this paper, a novel BER-aware reflecting elements allocation (REA) on an RIS is proposed to maintain the BER order among paired RIS-NOMA users. The RIS REA is useful for minimizing the average user BER, ompared with a system that allocates the same number of elements to all users. Additionally, the Ricean fading is considered instead of Rayleigh fading as it is more practical and general. Furthermore,an REA optimization objective function for equalizing the user BER is proposed. In order to solve the problem, a modified exhaustive search is proposed to reduce complexity. The distribution of the objective function is observed first; subsequently, the exhaustive search range is determined. Both the analytical and simulation results show that the proposed algorithm can minimize the average user BER.

scholarly journals BER-Aware Reflecting Elements Allocation for RIS-aided NOMA Networks over Ricean Fading

2022 ◽  
Author(s):  
Krisma Asmoro ◽  
I Nyoman Apraz Ramatryana ◽  
Soo Young Shin
Keyword(s):  
Objective Function ◽  
Bit Error Rate ◽  
Multiple Access ◽  
Rayleigh Fading ◽  
Exhaustive Search ◽  
Search Range ◽  
Ricean Fading ◽  
Simulation Results ◽  
Average User ◽  
Ber Performance

Reconfigurable intelligent surface (RIS) as a supportive technology for aiding downlink non-orthogonal multiple access (NOMA) can enhance the bit error rate (BER) performance. In this paper, a novel BER-aware reflecting elements allocation (REA) on an RIS is proposed to maintain the BER order among paired RIS-NOMA users. The RIS REA is useful for minimizing the average user BER, ompared with a system that allocates the same number of elements to all users. Additionally, the Ricean fading is considered instead of Rayleigh fading as it is more practical and general. Furthermore,an REA optimization objective function for equalizing the user BER is proposed. In order to solve the problem, a modified exhaustive search is proposed to reduce complexity. The distribution of the objective function is observed first; subsequently, the exhaustive search range is determined. Both the analytical and simulation results show that the proposed algorithm can minimize the average user BER.

scholarly journals Efficient TTI for 3G Multimedia Applications

2007 ◽  
Vol 2007 ◽  
pp. 1-7 ◽  
Author(s):  
Costas Chaikalis
Keyword(s):  
Computational Complexity ◽  
Bit Error Rate ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Turbo Coding ◽  
Operating Environments ◽  
Data Rates ◽  
Simulation Results ◽  
Flat Rayleigh Fading ◽  
Ber Performance

Time transmission interval (TTI) or outer block interleaving is an important task for the implementation of UMTS turbo coding in flat Rayleigh fading environment. An efficient TTI choice can save computational complexity. However, different multimedia scenarios are investigated using the maximum UMTS frame length, and simulation results are presented for the four possible outer block interleaver configurations in the case of flat Rayleigh fading channel. It is shown that different operating environments require an appropriate TTI in terms of bit error rate (BER) performance for the following data rates: 28.8 kbps, 64 kbps, 144 kbps, 384 kbps, and 2 Mbps.

scholarly journals 5G UFMC Scheme Performance with Different Numerologies

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1915
Author(s):  
Lambros Sakkas ◽  
Eleftherios Stergiou ◽  
Georgios Tsoumanis ◽  
Constantinos T. Angelis
Keyword(s):  
Mobile Communications ◽  
Bit Error Rate ◽  
Communication Systems ◽  
Modulation Scheme ◽  
Fifth Generation ◽  
Data Rates ◽  
The World ◽  
Simulation Results ◽  
5G Systems ◽  
Ber Performance

5G is the latest mobile communications standard that is spreading fast across the world. Recently defined requirements for 5G systems have led to higher applications’ requirements regarding data rates, lower requirements for latency, and higher efficiency regarding the spectrum usage. Universal Filtered Multi-Carrier (UFMC) is one new candidate modulation scheme for emergent Fifth Generation (5G) communication systems. This paper focuses on Universal Filtered Multi-Carrier (UFMC) design aspects in terms of Bit Error Rate (BER) performance in relation to the filter length used in subband filtering. Simulation results show that BER and CCDF performance varies for different filter lengths and modulation schemes. The main achievement of this work is that the results show that different Dolph–Chebyshev FIR filter lengths do not affect the BER performance both for the 64 and 256 QAM.

An Effective Scheme of M-Ary Spread Spectrum System Based on Orthogonal Spread Spectrum and CPSK

2013 ◽  
Vol 765-767 ◽  
pp. 2696-2700
Author(s):  
Yue Xuan Liu ◽  
Shu Jian Liang ◽  
Yue Huai Ma ◽  
Song Xian Gong
Keyword(s):  
Monte Carlo Simulation ◽  
Bit Error Rate ◽  
Spread Spectrum ◽  
Bandwidth Efficiency ◽  
Transform Domain ◽  
Communication Scheme ◽  
System Synchronization ◽  
Orthogonal Spread ◽  
Simulation Results ◽  
Ber Performance

A hybrid M-ary spread spectrum (SS) communication scheme which combined with orthogonal SS and CPSK technique is proposed. Based on dual orthogonal SS, every SS code is treated as original code to adopt CPSK modulation, the unattached synchronous code is chosen to achieve system synchronization. At the receiver, A circular correlator based on transform domain processing is employed to de-spread the received signals. Compared with M-ary SS and CPSK, the proposed scheme is able to obtain higher bandwidth efficiency, stronger anti-intercept capability, and better synchronous performance. The Monte-Carlo simulation results demonstrate that the proposed scheme can achieve better synchronous and bit error rate (BER) performance under additional white gauss noise channel models.

Beamforming with Kerdock Codes in LTE System for High-Speed Railway

2014 ◽  
Vol 989-994 ◽  
pp. 3556-3560
Author(s):  
Zhi Hua Yang ◽  
Lei Jun Wang ◽  
Ze Kai Fang
Keyword(s):  
Bit Error Rate ◽  
Communication System ◽  
System Performance ◽  
High Speed ◽  
High Speed Railway ◽  
Kerdock Codes ◽  
Simulation Results ◽  
Complex Multiplications ◽  
Beamforming Technique ◽  
Ber Performance

Beamforming technique based the reciprocity of LTE communication system for high-speed railway is a practical way to improve the system performance in this paper. Kerdock codes, which facilitate efficient codebook and codeword search, are implemented in the LTE system for high-speed railway as the beamforming precoding codebook. The analysis of complexity and simulation results about the communication system of the beamforming with Kerdock codes (KBF) show that the proposed KBF can eliminate complex multiplications and improve the Bit Error Rate (BER) performance at large SNR compared with the existing beamfoming communication system for high-speed railway.

Performance Analysis of Duobinary and AMI Techniques Using LG Modes in Hybrid MDM-WDM-FSO Transmission System

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhenlei Zhou ◽  
Erkai Li ◽  
Haiguang Zhang
Keyword(s):  
Performance Analysis ◽  
Wavelength Division Multiplexing ◽  
Bit Error Rate ◽  
Error Rate ◽  
Optical Communications ◽  
Free Space Optical ◽  
Wavelength Division ◽  
Mode Division Multiplexing ◽  
Simulation Results ◽  
Ber Performance

AbstractThis work is focused on transmission of duobinary and alternate mark inversion (AMI) modulation, adopting mode division multiplexing (MDM) of Laguerre Gaussian (LG) modes has been capitalized in wavelength division multiplexing (WDM) system, resulting in a 1.6 Gbps eight-channel free space optical communications (FSO) system. The simulation results show that duobinary offers better bit error rate (BER) performance compared to AMI for proposed hybrid MDM-WDM-FSO system.

scholarly journals Design and Performance Analysis of MISO-ORM-DCSK System over Rayleigh Fading Channels

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
Gang Zhang ◽  
Chuan gang Wang ◽  
Guo quan Li ◽  
Jin zhao Lin
Keyword(s):  
Fading Channels ◽  
Bit Error Rate ◽  
Fading Channel ◽  
Rayleigh Fading ◽  
Rayleigh Fading Channels ◽  
Decision Variables ◽  
Shift Keying ◽  
Simulation Results ◽  
And Performance ◽  
Chaos Shift Keying

A novel chaotic communication system, named Orthogonality-based Reference Modulated-Differential Chaos Shift Keying (ORM-DCSK), is proposed to enhance the performance of RM-DCSK. By designing an orthogonal chaotic generator (OCG), the intrasignal interference components in RM-DCSK are eliminated. Also, the signal frame format is expanded so the average bit energy is reduced. As a result, the proposed system has less interference in decision variables. Furthermore, to investigate the bit error rate (BER) performance over Rayleigh fading channels, the MISO-ORM-DCSK is studied. The BER expressions of the new system are derived and analyzed over AWGN channel and multipath Rayleigh fading channel. All simulation results not only show that the proposed system can obtain significant improvement but also verify the analysis in theory.

scholarly journals Efficient NOMA Design without Channel Phase Information using Amplitude-Coherent Detection

2020 ◽  
Author(s):  
Arafat Al-Dweik ◽  
Youssef Iraqi ◽  
Mohammad Al-Jarrah ◽  
E Alsusa ◽  
Mohamed-Slim Alouini ◽  
...  
Keyword(s):  
Maximum Likelihood ◽  
Bit Error Rate ◽  
Interference Cancellation ◽  
Multiple Access ◽  
Coherent Detection ◽  
The Other ◽  
Phase Information ◽  
Multiuser Interference ◽  
Alternative Approach ◽  
Ber Performance

<div>This paper presents the design and bit error rate (BER) analysis of a phase-independent non-orthogonal</div><div>multiple access (NOMA) system. The proposed NOMA system can utilize amplitude-coherent detection</div><div>(ACD) which requires only the channel amplitude for equalization purposes. In what follows, three</div><div>different designs for realizing the detection of the proposed NOMA are investigated. One is based on the</div><div>maximum likelihood (ML) principle, while the other two are based on successive interference cancellation</div><div>(SIC). Closed-form expressions for the BER of all detectors are derived and compared with the BER of</div><div>the coherent ML detector. The obtained results, which are corroborated by simulations, demonstrate that,</div><div>in most scenarios, the BER is dominated by multiuser interference rather than the absence of the channel</div><div>phase information. Consequently, the BER using ML and ACD are comparable for various cases of</div><div>interest. The paper also shows that the SIC detector is just an alternative approach to realize the ML</div><div>detector, and hence, both detectors provide the same BER performance.</div><div><br></div>

Performance Analysis of Duobinary and CSRZ Modulation Based Polarization Interleaving for High-Speed WDM-FSO Transmission System

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Zhenlei Zhou ◽  
Haiguang Zhang ◽  
Chun Lin ◽  
Abhishek Sharma
Keyword(s):  
Wavelength Division Multiplexing ◽  
Bit Error Rate ◽  
Optical Communications ◽  
High Speed ◽  
Transmission System ◽  
Free Space Optical ◽  
Wavelength Division ◽  
Simulation Results ◽  
Pi System ◽  
Ber Performance

AbstractIn this paper, the bit error rate (BER) performance of Duobinary (DB) is compared with carrier-suppressed return-to-zero (CSRZ) based polarization interleaving (PI) schemes for high-speed transmission system. The system is integrated with wavelength-division multiplexing (WDM) scheme and PI scheme for free space optical communications (FSO). The simulation results show that DB offers betters BER performance compared to CSRZ in high-speed WDM-FSO-PI system.

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