scholarly journals Using Least Mean p-Power Algorithm to Correct Channel Distortion in MC-CDMA Systems

2018 ◽  
Vol 3 ◽  
pp. 23-30
Author(s):  
Mohammed Zidane ◽  
Said Safi ◽  
Mohamed Sabri ◽  
Miloud Frikel
Keyword(s):  
Mobile Communications ◽  
Channel Model ◽  
Access Network ◽  
Adaptive Equalization ◽  
Radio Access ◽  
Broadband Radio ◽  
Channel Distortion ◽  
Cdma Systems ◽  
The One ◽  
Code Division Multiple

This work focuses on adaptive Broadband Radio Access Network (BRAN) channel identification and on downlink Multi-Carrier Code Division Multiple Access (MCCDMA) equalization. We use the normalized BRAN C channel model for 4G mobile communications, distinguishing between indoor and outdoor scenarios. On the one hand, BRAN C channel parameters are identified using the Least Mean p-Power (LMP) algorithm. On the other, we consider these coefficients in the context of adaptive equalization. We provide an overview and a mathematic formulation of MC-CDMA systems. According to these fundamental concepts, the equalizer technique is investigated analytically to compensate for channel distortion in terms of the bit error rate (BER). The numerical simulation results, for various signal-to-noise ratios and different p threshold, show that the presented algorithm is able to simulate the BRAN C channel measured with different accuracy levels. Furthermore, as far as the adaptive equalization problem is concerned, the results obtained using the zero-forcing equalizer demonstrate that the algorithm is adequate for some particular cases of threshold p.

Channel Identification and Equalization based on Kernel Methods for Downlink Multicarrier-CDMA Systems

2015 ◽  
Vol 13 (2) ◽  
pp. 14-29
Author(s):  
Mohammed Boutalline ◽  
Belaid Bouikhalene ◽  
Said Safi
Keyword(s):  
Fading Channels ◽  
Minimum Mean Square Error ◽  
Access Network ◽  
Positive Definite Kernels ◽  
Zero Forcing ◽  
Channel Identification ◽  
Radio Access ◽  
Broadband Radio ◽  
Channel Parameters ◽  
Code Division Multiple

In this paper the authors are focused on channel identification and equalization for Multi-Carrier Code Division Multiple Access (MC-CDMA) system. For this, they identify the impulse response of two practical selective frequency fading channels called Broadband Radio Access Network (BRAN A and BRAN B) normalized by the European Telecommunications Standards Institute (ETSI). To identify the channel parameters, they have the positive definite kernels to build on algorithm. The simulations show that the presented method confirms the good performance for different SNR values. In part of equalization, the authors use the Zero Forcing (ZF) and Minimum Mean Square Error (MMSE) equalizers.

BRAIN?an architecture for a broadband radio access network of the next generation

2001 ◽  
Vol 1 (1) ◽  
pp. 55-75 ◽  
Author(s):  
Josef Urban ◽  
Dave Wisely ◽  
Edgar Bolinth ◽  
Georg Neureiter ◽  
Mika Liljeberg ◽  
...  
Keyword(s):  
Access Network ◽  
Next Generation ◽  
Radio Access Network ◽  
Radio Access ◽  
Broadband Radio

Bit Error Rate Analysis of MC-CDMA Systems with Channel Identification Using Higher Order Cumulants

2016 ◽  
Vol 1 (1) ◽  
pp. 138
Author(s):  
Mohammed Zidane ◽  
Said Safi ◽  
Mohamed Sabri ◽  
Ahmed Boumezzough
Keyword(s):  
Signal To Noise Ratio ◽  
Minimum Mean Square Error ◽  
Access Network ◽  
Higher Order ◽  
Channel Identification ◽  
Rate Analysis ◽  
Higher Order Cumulants ◽  
Cdma Systems ◽  
Non Gaussian ◽  
Code Division Multiple

The aim of this paper is to contribute to study the problems of the blind identification and equalization using Higher Order Cumulants (HOC) in downlink Multi-Carrier Code Division Multiple Access (MC-CDMA) systems. For this problem, two blind algorithms based on HOC for Broadband Radio Access Network (BRAN) channel are proposed. In the one hand, to assess the performance of these approaches to identify the parameters of non minimum phase channels, we have considered two theoretical channels, and one practical frequency selective fading channel called BRAN C, driven by non gaussian signal. In the other hand, we use the Minimum Mean Square Error (MMSE) equalizer technique after the channel identification to correct the channel distortion. Theoretical analysis and numerical simulation results, in noisy environment and for different signal to noise ratio (SNR), are presented to illustrate the performance of the proposed methods.

scholarly journals Channel Identification Based on Cumulants, Binary Measurements, and Kernels

Systems ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 46
Author(s):  
Hicham Oualla ◽  
Rachid Fateh ◽  
Anouar Darif ◽  
Said Safi ◽  
Mathieu Pouliquen ◽  
...  
Keyword(s):  
Access Network ◽  
Reproducing Kernels ◽  
Blind Identification ◽  
Data Input ◽  
Output Measurement ◽  
Channel Identification ◽  
Advantages And Disadvantages ◽  
Radio Access ◽  
Broadband Radio ◽  
Channel Parameters

In this paper, we discuss the problem of channel identification by using eight algorithms. The first three algorithms are based on higher-order cumulants, the next three algorithms are based on binary output measurement, and the last two algorithms are based on reproducing kernels. The principal objective of this paper is to study the performance of the presented algorithms in different situations, such as with different sizes of the data input or different signal-to-noise ratios. The presented algorithms are applied to the estimation of the channel parameters of the broadband radio access network (BRAN). The simulation results confirm that the presented algorithms are able to estimate the channel parameters with different accuracies, and each algorithm has its advantages and disadvantages for a given situation, such as for a given SNR and data input. Finally, this study provides an idea of which algorithms can be selected in a given situation. The study presented in this paper demonstrates that the cumulant-based algorithms are more adequate if the data inputs are not available (blind identification), but the kernel- and binary-measurement-based methods are more adequate if the noise is not important (SNR≥16 dB).

scholarly journals Network Efficiency Amendment Utilizing Cloud Radio Access Network In Mobile Communications

2018 ◽  
Vol 7 (4.6) ◽  
pp. 350
Author(s):  
Karthikala. P ◽  
Dr. C.Arunachala Perumal ◽  
Ms. M.Ramya
Keyword(s):  
Mobile Communications ◽  
Optimization Design ◽  
Access Network ◽  
Telecommunications Industry ◽  
Data Traffic ◽  
Network Efficiency ◽  
Green Communication ◽  
Radio Access Network ◽  
Cloud Radio Access Network ◽  
Radio Access

Mobile data traffic is finding exponential growth currently in telecommunications industry. It has become important to concentrate on both spectral and energy efficiencies in utilizing cellular networks under green communication standpoint. Thus, for 5G the utmost priority is that to increase data traffic and reduce the total network energy ingesting by half. The proposed work is to design the Cloud Radio Access Network (C-RAN) with energy efficient, flexible and capacity-enhanced features by effectively bundling and establishing relation between BBU and RRU utilizing Catechistic technique. Mathematical results with realistic parameters prove that the projected optimization design clearly improve the energy efficiency of C-RAN’s compared to standard schemes. 

scholarly journals Problems of constructing broadband radio access systems of mobile radio communication

2019 ◽  
Vol 2019 (2) ◽  
pp. 24-30
Author(s):  
Василий Типаков ◽  
Vasily Sergeevich Tipakov ◽  
Тимур Яковлев ◽  
Timur Aleksandrovich Yakovlev
Keyword(s):  
Cellular Networks ◽  
Mobile Networks ◽  
Mobile Communications ◽  
Current Trend ◽  
Mobile Radio ◽  
Base Stations ◽  
Radio Communication ◽  
Radio Access ◽  
Broadband Radio ◽  
Internal Network

The article is focused on the problem of degrading the signals of broadband 3G / 4G mobile radio access systems in places of subscribers clustering and in so-called “dead zones”. The analysis of the actual principles of building mobile networks has been carried out, the main disadvantages of the approaches to the development of cellular networks have been identified. The current trend of building macro cells in the urban environment has lost its effectiveness due to the increasing frequencies used; it has to be replaced by a fundamentally new way of planning mobile networks. A new principle of providing access to mobile communications “from inside to outside” is proposed, which takes into account the needs of a large number of subscribers in the premises. It is based on setting the maximum number of internal base stations fully meeting the needs of internal network users. Such a distinction will positively affect all subscribers and improve the experience from using the high-quality services of the mobile operators, which will result in increasing the economic performance

scholarly journals On the Secrecy Capacity of 5G New Radio Networks

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Ke Xiao ◽  
Shaowei Zhang ◽  
Yunhua He
Keyword(s):  
Channel Model ◽  
Critical Role ◽  
Multiple Input Multiple Output ◽  
Access Network ◽  
Secrecy Capacity ◽  
Radio Communication ◽  
Radio Access ◽  
Air Interface ◽  
New Radio ◽  
Input Multiple Output

The new radio technology for the fifth-generation wireless system has been extensively studied all over the world. Specifically, the air interface protocols for 5G radio access network will be standardized by the 3GPP in the coming years. In the next-generation 5G new radio (NR) networks, millimeter wave (mmWave) communications will definitely play a critical role, as new NR air interface (AI) is up to 100 GHz just like mmWave. The rapid growth of mmWave systems poses a variety of challenges in physical layer (PHY) security. This paper investigates those challenges in the context of several 5G new radio communication technologies, including multiple-input multiple-output (MIMO) and nonorthogonal multiple access (NOMA). In particular, we introduce a ray-tracing (RT) based 5G NR network channel model and reveal that the secrecy capacity in mmWave band widely depends on the richness of radio frequency (RF) environment through numerical experiments.

Successive Interference Cancellation for DS-Optical PPM-CDMA Systems

2016 ◽  
Vol 37 (2) ◽  
Author(s):  
N. Alsowaidi ◽  
Tawfig Eltaif ◽  
M. R. Mokhtar
Keyword(s):  
Interference Cancellation ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Successive Interference Cancellation ◽  
Pulse Position Modulation ◽  
Direct Sequence ◽  
Signature Sequence ◽  
Cdma Systems ◽  
The One ◽  
Code Division Multiple

AbstractIn this paper we introduce a successive interference cancellation (SIC) scheme for direct sequence optical code division multiple access (DS-OCDMA) systems using pulse position modulation (PPM). Considering double-padded modified prime code (DPMPC) as a signature sequence code, results show that the system has better performance in terms of both capacity and bit error rate (BER) as compared to the one without cancellation scheme, where the system with SIC scheme can support up to 88 users while the system without SIC scheme can support only 38 users at similar BER=10

Security in 2.5G Mobile Systems

2009 ◽  
pp. 2752-2765
Author(s):  
Christos Xenakis
Keyword(s):  
Mobile Communications ◽  
Data Transfer ◽  
Access Network ◽  
Mobile Systems ◽  
Security Architecture ◽  
Security Measures ◽  
Packet Radio ◽  
Related Data ◽  
Radio Access ◽  
Fixed Part

The global system for mobile communications (GSM) is the most popular standard that implements second generation (2G) cellular systems. 2G systems combined with general packet radio services (GPRS) are often described as 2.5G, that is, a technology between the 2G and third generation (3G) of mobile systems. GPRS is a service that provides packet radio access for GSM users. This chapter presents the security architecture employed in 2.5G mobile systems focusing on GPRS. More specifically, the security measures applied to protect the mobile users, the radio access network, the fixed part of the network, and the related data of GPRS are presented and analyzed in detail. This analysis reveals the security weaknesses of the applied measures that may lead to the realization of security attacks by adversaries. These attacks threaten network operation and data transfer through it, compromising end users and network security. To defeat the identified risks, current research activities on the GPRS security propose a set of security improvements to the existing GPRS security architecture.

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