Efficient Configurations for Dynamic Applications in Next Generation Mobile Systems

2016 ◽  
pp. 112-147 ◽  
Author(s):  
Nikolaos Zompakis ◽  
Francky Catthoor ◽  
D. Soudris
Keyword(s):  
Software Defined Radio ◽  
Communication Systems ◽  
Wireless Systems ◽  
Mobile Systems ◽  
Wireless Communication Systems ◽  
Next Generation ◽  
Performance Requirements ◽  
Wide Range ◽  
System Configurations ◽  
Design Challenges

Next generation wireless systems support a wide range of communication protocols and services, opening new design challenges. The desired flexibility presupposes effective approaches that exploit the system configurations with an optimal way. A well-known state-of-the-art example of a wireless platform is the Software Defined Radio (SDR). SDRs are characterized by strict performance requirements that introduce a lot of dynamism in respect with the resource utilization. Additionally, these devices experience transient overloads due to workload bursts or hardware malfunctions. The aforementioned reasons lead the system to take timely reactions to unexpected usage scenarios. The current chapter concentrates on these design challenges exploiting the system scenario methodology, proposing solutions especially for wireless communication systems. More precisely, it will be studied the tradeoffs between the representativeness of the scenarios (clustering overhead), the implementation of the scenario detection (detection overhead) and the platform tuning cost (switching overhead).

scholarly journals A Real Case of Implementation of the Future 5G City

2018 ◽  
Vol 11 (1) ◽  
pp. 4 ◽  
Author(s):  
Dania Marabissi ◽  
Lorenzo Mucchi ◽  
Romano Fantacci ◽  
Maria Spada ◽  
Fabio Massimiani ◽  
...  
Keyword(s):  
Communication Systems ◽  
Social Impact ◽  
Field Trials ◽  
Use Cases ◽  
Wireless Communication Systems ◽  
Performance Requirements ◽  
Fifth Generation ◽  
Wide Range ◽  
5G Network ◽  
The Future

The fifth generation (5G) of wireless communication systems is considered the key technology to enable a wide range of application scenarios and the effective spreading of the smart city concept. Vertical business use cases, specifically designed for the future 5G city, will have a strong economical and social impact. For this reason, ongoing 5G field trials have to test newly deployed technologies as well as the capability of 5G to create a new digital economy. This paper describes the 5G field trial environment that was launched in Italy at the end of 2017. The aim is to evaluate the capability of the 5G network of supporting innovative services with reference to suitably designed key performance indicators and to evaluate the opportunities offered by these services. Indeed, vertical business use cases, specifically designed for the future 5G city, with a strong economic and social impact, are under implementation and will be evaluated. In particular, the paper provides a detailed description of the deployment of an actual complete integrated 5G network. It shows how 5G is effective enabling technology for a wide range of vertical business and use cases. Indeed, its flexibility allows to satisfy completely different performance requirements of real services. Some preliminary results, obtained during the first phase, are presented for a smart mobility scenario.

scholarly journals MEMS-BASED OSCILLATORS: A REVIEW

2014 ◽  
Vol 15 (1) ◽  
Author(s):  
Jamilah Karim ◽  
A. H. M. Zahirul Alam ◽  
Anis Nurashikin Nordin
Keyword(s):  
Wireless Communication ◽  
Communication Systems ◽  
Wireless Systems ◽  
Wireless Communication Systems ◽  
Reference Frequency ◽  
Wireless System ◽  
Circuit Topology ◽  
Fully Integrated ◽  
Mems Technology ◽  
Accuracy And Stability

ABSTRACT: This paper presents an overview of microelectromechanical (MEMS) based oscillators. The accuracy and stability of the reference frequency will normally limit the performance of most wireless communication systems. MEMS technology is the technology of choice due to its compatibility to silicon, leading to integration with circuits and lowering power consumption. MEMS based oscillators also provide the potential of a fully integrated transceiver. The most commonly used topology for MEMS based oscillators are pierce oscillator circuit topology and TIA circuit topology. Both topologies result in very competitive output in terms of phase noise and power consumption.  They can be used for either higher or lower Rx. The major difference between both topologies is the number of transistors used. TIA circuit used more number of transistor compare to pierce circuit. Thus design complexity of the TIA is higher. Pierce circuit is simpler, provide straightforward biasing and easier to design. The highly integratable of MEMS-based oscillators have made them much needed in future multiband wireless system. So that future wireless systems are able to function globally without any problem. ABSTRAK: Kertas kerja ini membentangkan gambaran keseluruhan mikroelektromekanikal (MEMS) berdasarkan pengayun.  Ketepatan dan kestabilan frekuensi rujukan sering membataskan perlaksanaan kebanyakan sistem komunikasi tanpa wayar. Teknologi MEMS merupakan teknologi pilihan memandangkan ia serasi dengan silikon; membolehkan integrasi dengan litar dan penggunaan tenaga yang rendah.  Pengayun berdasarkan MEMS juga  berpotensi sebagai integrasi penuh penghantar-terima. Topologi yang sering digunakan untuk pengayun berdasarkan MEMS adalah topologi litar pengayun pencantas dan topologi litar TIA.  Keputusan bagi kedua-dua topologi adalah amat kompetitif dari segi fasa bunyi dan penggunaan tenaga. Ia boleh digunakan untuk meninggikan atau merendahkan Rx. Perbezaan utama di antara kedua-dua topologi adalah bilangan transistor yang digunakan. Litar TIA menggunakan bilangan transistor yang lebih daripada litar pencantas.  Maka, rekaan TIA adalah lebih rumit.  Litar pencantas adalah lebih ringkas, memberikan pincangan yang jelas dan rekabentuk yang mudah. Pengayun berdasarkan MEMS amat bersepadu menjadikan ia sesuai sebagai sistem tanpa wayar berbilang jalur masa depan.  Jesteru sistem tanpa wayar dapat berfungsi pada peringkat global tanpa sebarang kesulitan.

Wireless IEEE 802.11-Based Networking Approaches for Industrial Networked Systems

2013 ◽  
pp. 286-305
Author(s):  
Ricardo Moraes ◽  
Francisco Vasques
Keyword(s):  
Ieee 802.11 ◽  
Communication Systems ◽  
Networked Control Systems ◽  
Voice Over Ip ◽  
Next Generation ◽  
Medium Access ◽  
Communication Services ◽  
Access Protocol ◽  
Wide Range ◽  
New Applications

During the last few years, the demand for Real-Time (RT) communication has been steadily increasing due to a wide range of new applications. Remarkable examples are VoIP (Voice over IP) and Networked Control Systems (NCS). For such RT applications, the support of timely communication services is one of the major requirements. The purpose of this chapter is to survey the state-of-the-art on RT communication in CSMA-based networks and to identify the most suitable approaches to deal with the requirements imposed by next generation communication systems. This chapter focuses on one of the most relevant solutions that operate in shared broadcast environments, according to the CSMA medium access protocol, the IEEE 802.11 standard. From this survey, it becomes clear that traditional CSMA-based networks are not able to deal with the requirements imposed by next generation communication systems. More specifically, they are not able to handle uncontrolled traffic sources sharing the same broadcast environment.

Reconfigurable Antenna

2016 ◽  
pp. 237-263
Author(s):  
Mohamad Kamal A Rahim ◽  
Huda A. A. Majid ◽  
Mohamad Rijal Hamid
Keyword(s):  
Communication Systems ◽  
Low Cost ◽  
Wireless Systems ◽  
Reconfigurable Antennas ◽  
Effective Length ◽  
Slot Antenna ◽  
Wireless Communication Systems ◽  
Reconfigurable Antenna ◽  
5 Ghz ◽  
Narrow Bands

Reconfigurable antennas have attracted a lot of attention especially in future wireless communication systems. Superior features such as reconfigurable capability, low cost, multi-purpose functions and size miniaturization have given reconfigurable antennas advantage to be integrated into a wireless systems. In this chapter, two types of reconfigurable antennas are discussed. First, frequency reconfigurable narrowband microstrip slot antenna (FRSA) is presented. The proposed antenna is designed to operate at six reconfigurable frequency bands from 2 GHz to 5 GHz with bidirectional radiation pattern. The second antenna design is frequency reconfigurable narrowband patch-slot antenna (FRPSA) is presented. The antenna is a combination of a microstrip patch and slot antenna. Nine different narrow bands are produced by tuning the effective length of the slot. The performances of the antenna in term of simulated and measured results are presented. In conclusion, good agreement between the simulated and measured results has been attained.

scholarly journals Compact Rectifier Circuit Design for Harvesting GSM/900 Ambient Energy

Electronics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1614
Author(s):  
Surajo Muhammad ◽  
Jun Jiat Tiang ◽  
Sew Kin Wong ◽  
Amjad Iqbal ◽  
Mohammad Alibakhshikenari ◽  
...  
Keyword(s):  
Circuit Design ◽  
Communication Systems ◽  
Path Loss ◽  
Input Power ◽  
Wireless Communication Systems ◽  
Rf Power ◽  
Total Size ◽  
High Input Power ◽  
Wide Range ◽  
Rf Energy

In this paper, a compact rectifier, capable of harvesting ambient radio frequency (RF) power is proposed. The total size of the rectifier is 45.4 mm × 7.8 mm × 1.6 mm, designed on FR-4 substrate using a single-stage voltage multiplier at 900 MHz. GSM/900 is among the favorable RF Energy Harvesting (RFEH) energy sources that span over a wide range with minimal path loss and high input power. The proposed RFEH rectifier achieves measured and simulated RF-to-dc (RF to direct current) power conversion efficiency (PCE) of 43.6% and 44.3% for 0 dBm input power, respectively. Additionally, the rectifier attained 3.1 V DC output voltage across 2 kΩ load terminal for 14 dBm and is capable of sensing low input power at −20 dBm. The work presents a compact rectifier to harvest RF energy at 900 MHz, making it a good candidate for low powered wireless communication systems as compares to the other state of the art rectifier.

Multiband-coupled sectoral antenna using high and low dielectric constant substrates

2014 ◽  
Vol 7 (6) ◽  
pp. 721-726
Author(s):  
Abhishek Kandwal ◽  
Jai Verdhan Chauhan ◽  
Sunil Kumar Khah
Keyword(s):  
Dielectric Constant ◽  
Wireless Communication ◽  
Antenna Array ◽  
Communication Systems ◽  
Ground Plane ◽  
Mobile Systems ◽  
Low Dielectric Constant ◽  
Wireless Communication Systems ◽  
Satellite Systems ◽  
Low Dielectric

Design analysis of multiband-coupled stacked sectoral antenna array with finite ground plane using high low dielectric constant substrates is proposed in this paper for modern communication systems and applied physics. Multiband planar antennas have been extensively developed due to demands for integration of wireless communication systems. In this paper, we present the design and development of a multiband microstrip antenna array with parasitic coupling and stacking using two different substrates. The stacked designed antenna resonates at three different frequencies: 3.8, 5.4, and 10 GHz; therefore, showing a multiband property with good radiation (far-field) characteristics. A significant comparison study is also presented considering different dielectric constant substrates. The proposed antenna is an attractive solution for different wireless communication systems such as mobile systems, satellite systems, etc.

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