scholarly journals Efficient Resource Sharing Architecture for Multistandard Communication System

VLSI Design ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
T. Suresh ◽  
K. L. Shunmuganathan
Keyword(s):  
Resource Sharing ◽  
Wireless Lan ◽  
Orthogonal Frequency Division Multiplexing ◽  
Dynamic Network ◽  
Hardware Architecture ◽  
Fourth Generation ◽  
Receiver Architecture ◽  
Efficient Resource ◽  
Code Division Multiple ◽  
Dedicated Hardware

The Fourth Generation (4G) network is expected to serve mobile subscribers under dynamic network conditions and offer any type service: anytime, anywhere, and anyhow. Two such technologies that can respond to the above said services are Wideband Code Division Multiple Access (WCDMA) and Orthogonal Frequency Division Multiplexing (OFDM). The main contribution of this paper is to propose a dedicated hardware module which can reconfigure itself either to the OFDM Wireless LAN or WCDMA standard. In this paper, Fast Fourier Transform (FFT) algorithm is implemented for OFDM standard, and rake receiver is implemented for WCDMA standard. Initially efficient implementations of these two algorithms are tested separately and identified the resources utilized by them. Then the new hardware architecture, which configures to any one of these two standards on demand, is proposed. This architecture efficiently shares the resources needed for these two standards. The proposed architecture is simulated using ModelSimSE v6.5 and mapped onto a virtex 5 FPGA device (xc5v1x30ff324) using the tool Xilinx ISE 9.2i, and the results are compared with the standard approach. These results show that the proposed hardware architecture utilizes less number of resources compared to the conventional Reconfigurable Receiver Architecture System.

Fourth Generation Networks

2010 ◽  
pp. 146-180
Author(s):  
Jivesh Govil ◽  
Jivika Govil
Keyword(s):  
Mobile Networks ◽  
Mobility Management ◽  
Wireless Lan ◽  
High Speed ◽  
Mobile Systems ◽  
Fourth Generation ◽  
Packet Access ◽  
4G Wireless ◽  
Wireless Convergence ◽  
Code Division Multiple

Mobile researchers are witnessing burgeoning interest in 4G wireless networks that patronize global roaming across diverse wireless and mobile networks. The pith of 4G mobile systems lies in seamlessly integrating the existing wireless technologies including Wideband Code Division Multiple Access (WCDMA). High Speed Uplink Packet Access (HSUPA)/ High-Speed Downlink Packet Access (HSDPA). 1×Evolution Data Optimized, (1×EVDO). Wireless LAN, and Bluetooth. However, migrating current systems to 4G engenders enormous challenges. With ever-changing specification and standards, developing a prototype requires flexible process to provide 4G system capabilities. The 4G system has its own advantages and associated dangers. This chapter intends to deal with adoption issues of 4G, the fundamentals as well as issues pertaining to 4G networks, standards, terminals, services of 4G, and the vision of network operators and service providers. Besides, to overcome the challenges of sophisticated personal sessions and service mobility, advanced mobility management (MM) is needed to fulfill the need for seamless global roaming. The chapter endeavors to make an evaluation on development, transition, and roadmap for fourth generation mobile communication system with a perspective of wireless convergence domain in addition to mobility management. Lastly, open research issues in 4G are succinctly discussed.

scholarly journals Mobile Fog Computing-Assisted Resource Allocation for Two-Hop SWIPT OFDM Networks

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Xiaofei Di ◽  
Yu Zhang ◽  
Tong Liu ◽  
Shaoli Kang ◽  
Yue Zhao
Keyword(s):  
Resource Allocation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Fog Computing ◽  
Achievable Rate ◽  
Fast Time ◽  
Power Splitting ◽  
Frequency Division ◽  
Decode And Forward ◽  
Subcarrier Pairing ◽  
Receiver Architecture

The mobile fog computing-assisted resource allocation (RA) is studied for simultaneous wireless information and power transfer (SWIPT) two-hop orthogonal frequency division multiplexing (OFDM) networks, where a decode-and-forward (DF) relay first harvests energy from signals emitted by a source and then helps the source to forward information to its destination by using the harvested energy. Power splitting (PS) strategy is adopted at the relay and a different PS (DPS) receiver architecture is proposed, where the PS factors of all subcarriers are different. A RA problem is formulated to maximize the system’s achievable rate by jointly optimizing subcarrier pairing, power allocation, and PS factors. Since the RA problem is a nonconvex problem and is difficult to solve, an efficient RA algorithm is designed. As the wireless channels are fast time-varying, the computation is performed in mobile fog node close to end nodes, instead of remote clouds. Results demonstrate that the achievable rate is significantly increased by using the proposed RA algorithm. It is also found that the computation complexity of RA algorithm of DPS receiver architecture is much lower than the existing identical PS (IPS) receiver architecture, and thus the proposed DPS architecture is more suitable for computation-constrained fog system.

Access Security in UMTS and IMS

2008 ◽  
pp. 339-350
Author(s):  
Yan Zhang ◽  
Yifan Chen ◽  
Rong Yu ◽  
Supeng Leng ◽  
Huansheng Ning ◽  
...  
Keyword(s):  
Mobile Networks ◽  
Mobile Communications ◽  
Fourth Generation ◽  
Maintenance Cost ◽  
Mobile Telecommunications ◽  
Backward Compatibility ◽  
The Future ◽  
Universal Mobile Telecommunications System ◽  
Code Division Multiple ◽  
Time Division

Motivated by the requirements for higher data rate, richer multimedia services, and broader radio range wireless mobile networks are currently in the stage evolving from the second-generation (2G), for example, global system for mobile communications (GSM), into the era of third-generation (3G) or beyond 3G or fourth-generation (4G). Universal mobile telecommunications system (UMTS) is the natural successor of the current popular GSM (http://www.3gpp.org) code division multiple access 2000 (CDMA2000) is the next generation version for the CDMA-95, which is predominantly deployed in North America and North Korea. Time division-sychrononous CDMA (TD-SCDMA) is in the framework of 3rd generation partnership project 2 (3GPP2) and is expected to be one of the principle wireless technologies employed in China in the future (http://www.3gpp.org; 3G TS 35.206). It is envisioned that each of three standards in the framework of international mobile telecommunications- 2000 (IMT-2000) will play a significant role in the future due to the backward compatibility, investment, maintenance cost, and even politics.

Electrical Spreading Code-Based OFDM Optical Access Networks for Budget Enhancement and Reduced System Bandwidth Requirement

2015 ◽  
Vol 36 (4) ◽  
Author(s):  
Pravindra Kumar ◽  
Anand Srivastava
Keyword(s):  
Optical Networks ◽  
Orthogonal Frequency Division Multiplexing ◽  
High Speed ◽  
Optical Network ◽  
Access Networks ◽  
Passive Optical Network ◽  
Spreading Code ◽  
Optical Access Networks ◽  
Optical Access ◽  
Code Division Multiple

AbstractPassive optical networks based on orthogonal frequency division multiplexing (OFDM-PON) give better performance in high-speed optical access networks. For further improvement in performance, a new architecture of OFDM-PON based on spreading code in electrical domain is proposed and analytically analyzed in this paper. This approach is referred as hybrid multi-carrier code division multiple access-passive optical network (MC-CDMA-PON). Analytical results show that at bit error rate (BER) of 10

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