Indoor Short Range Wireless Broadband Communications Based on Optical Fiber Distribution

2014 ◽  
pp. 244-276
Author(s):  
Haymen Shams
Keyword(s):  
Short Range ◽  
Limiting Factors ◽  
Optical Components ◽  
Broadband Wireless ◽  
Available Bandwidth ◽  
Research Areas ◽  
Indoor Wireless ◽  
Wireless Broadband ◽  
Bandwidth Limitation ◽  
Continuous Demand

There is a continuous demand for increasing wireless access broadband services to the end users, especially with widespread high quality mobile devices. The Internet mobile applications and multimedia services are constantly hungry for broadband wireless bandwidth. In order to overcome this bandwidth limitation, a frequency band (57-64 GHz) has recently been assigned for short range indoor wireless broadband signals due to the large available bandwidth. However, the transmission at this band is limited to a few meters due to the high atmospheric absorption loss. Radio over Fiber (RoF) technology was considered an efficient solution to extend the distribution range and wireless capacity services. This chapter presents an introduction to RoF technology and its basic required optical components for indoor short range wireless millimeter waves (mm-waves). The limiting factors of RoF and its impairments are also described. Moreover, optical mm-wave generation solutions are explained and followed by the recent optical 60GHz activities and upcoming research areas such as THz and optical wireless.

Maximizing Power Saving for VoIP over WiMAX Systems

2016 ◽  
Vol 7 (1) ◽  
pp. 32-40 ◽  
Author(s):  
Tamer Z. Emara
Keyword(s):  
Energy Consumption ◽  
Mobile Networks ◽  
Power Saving ◽  
High Mobility ◽  
Portable Devices ◽  
Broadband Wireless ◽  
Broadband Access Networks ◽  
Mobile Stations ◽  
Wireless Broadband ◽  
The Voice

The voice-over-Internet protocol (VoIP) service is expected to be widely supported in wireless mobile networks. Mobile Broadband Wireless networks VoIP service to users with high mobility requirements, connecting via portable devices which rely on the use of batteries by necessity. Energy consumption significantly affects mobile subscriber stations in wireless broadband access networks. Efficient energy saving is an important and challenging issue because all mobile stations are powered by limited battery lifetimes. Therefore, the authors propose an adaptive mechanism suitable for VoIP service with silence suppression. The proposed mechanism was examined with a computer simulation. The simulation results demonstrate that the proposed mechanism reduces energy consumption.

scholarly journals Security of Mobile and Wireless Networks

10.28945/2491 ◽  
2002 ◽  
Author(s):  
Kaj J. Grahn ◽  
Göran Pulkkis ◽  
Jean-Sebastien Guillard
Keyword(s):  
Local Area Network ◽  
High Capacity ◽  
Local Area ◽  
Area Network ◽  
Security Measures ◽  
Development Environment ◽  
Wireless Network Security ◽  
Research Areas ◽  
Wireless Broadband ◽  
Wireless Broadband Network

This paper gives a topical overview of wireless network security aspects. Security measures taken depend on the different protocols, standards, techniques and systems available. A brief introduction to security protocols, standards and corresponding technologies is given. The essay will concentrate on 2G, 2.5G, 3G and wireless local area networks. Standards, like WAP, IEEE 802.11, HomeRF, HIPERLAN/2, IPSec and Bluetooth, are included. A local area network, MediaPoli, has been implemented to work as a testbed for new innovations, products and services. The development environment is based on this high-capacity wired/wireless broadband network. Key research areas, actual projects and offered services are discussed. All activities aim at the future information society.

Wavelength Division Multiplexing Technologies and their Applications

2009 ◽  
pp. 67-79
Author(s):  
N. Merlemis ◽  
D. Zevgolis
Keyword(s):  
Optical Networks ◽  
Optical Fibre ◽  
Wavelength Division Multiplexing ◽  
Laser Light ◽  
Optical Carrier ◽  
Optical Components ◽  
Available Bandwidth ◽  
Wavelength Division ◽  
Dense Wdm

This chapter is an introduction of the Wavelength-division multiplexing (WDM) technologies (such as Dense WDM and coarse WDM) and their recent applications in optical networks. WDM is used to multiplex multiple optical carrier signals on a single optical fibre by using different wavelengths of laser light to carry different signals. This allows for a multiplication in available bandwidth and, in addition, makes possible to perform bidirectional communications over one strand of fibre. We present the optical components used in WDM and review some of the most important applications of the technology.

Adaptive Scheduling for TCP-Fairness in Wireless Broadband Networks

2011 ◽  
pp. 161-186
Author(s):  
Balakrishnan K ◽  
Ritesh Kumar Kalle ◽  
Debabrata Das
Keyword(s):  
Access Networks ◽  
Adaptive Scheduling ◽  
Wireless Access ◽  
Wireless Access Networks ◽  
Broadband Wireless ◽  
Last Mile ◽  
Tcp Fairness ◽  
Wireless Broadband ◽  
Simulation Results ◽  
Tcp Throughput

The exponential growth in multimedia traffic (Cisco Visual Networking Index, 2010), predominantly on UDP transport, poses a threat to the TCP’s best effort throughput. This problem is more acute in last mile broadband wireless access networks (Bakshi, Krishna, Vaidya, & Pradhan, 1997). Most scheduling algorithms discuss improving the combined TCP and UDP throughput or improving the TCP throughput without studying the effects of inelastic traffic such as UDP. This chapter furthers the necessity for TCP throughput protection and proposes a novel dynamically adapting Weighted Fair Queue (WFQ) based scheduling mechanism that provides a higher degree of TCP protection. This is accomplished by differentiating between TCP and UDP flows, buffer provisioning for each flow, and prioritizing TCP ACK packets. The simulation results show that the proposed mechanism yields a relative improvement of up to 29% of TCP goodput and 7.5% of aggregate MAC throughput over the mechanism without the proposed improvements.

The wireless broadband (wibro) system for broadband wireless internet services

2006 ◽  
Vol 44 (7) ◽  
pp. 106-112 ◽  
Author(s):  
Seung-Que Lee ◽  
Namhun Park ◽  
Choongho Cho ◽  
Hyongwoo Lee ◽  
Seungwan Ryu
Keyword(s):  
Internet Services ◽  
Wireless Internet ◽  
Broadband Wireless ◽  
Wireless Broadband

ISI Cancellation in 4G Wireless Mobiles

2009 ◽  
pp. 354-367
Author(s):  
Kumar Priyatam ◽  
R. M. Banakar ◽  
B. Shankaranand
Keyword(s):  
Channel Estimation ◽  
Fading Channels ◽  
Interference Cancellation ◽  
Communication Systems ◽  
Wireless Channel ◽  
Selective Fading ◽  
Broadband Wireless ◽  
Wireless Broadband ◽  
Improved Performance ◽  
4G Wireless

Physical layer issues of broadband wireless communication systems form the bottleneck in providing fast and reliable communication over wireless channel. Critical performance limiting challenges are time selective fading channels, frequency selective fading channels, noise, inter symbol interference (ISI), inter carrier interference, power, and bandwidth. Addressing these challenges of wireless broadband communication systems, one can provide faster data processing with lower computational complexity, higher data throughput, and improved performance in terms of bit error rate (BER). In this chapter an effective technique (SISO estimation) to handle interference cancellation is developed. ISI is caused by multi-path propagation. It can be reduced by using a channel equalizer which provides the receiver with the prior knowledge of the channel. Channel estimation is a technique to acquire behavior of the channel. Accuracy of the channel estimation improves the system performance. At BER of 10-4 SISO estimator provide an improvement of 2dB as compared with MMSE DFE estimator.

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