Advances of Radio Interface in WCDMA Systems

2009 ◽  
pp. 9-14
Author(s):  
Ju Wang ◽  
Jonathan C.L. Liu
Keyword(s):  
High Speed ◽  
Hot Spot ◽  
Data Rate ◽  
Multimedia Data ◽  
Handheld Devices ◽  
Cdma System ◽  
Data Services ◽  
Radio Interface ◽  
High Data ◽  
Air Interface

Recent years have witnessed the rapid progress in handheld devices. This has resulted in a growing number of mobile phones or PDAs that have a built-in camera to record still pictures or live videos. Encouraged by the success of second generation cellular wireless networks, researchers are now pushing the 3G standard to support a seamless integration of multimedia data services. One of the main products is WCDMA (Holma & Toskala, 2001), short for wideband code division multiple access. WCDMA networks have 80 million subscribers in 46 countries at the time of this writing. WCDMA can be viewed as a successor of the 2G CDMA system. In fact, many WCDMA technologies can be traced back to the 2G CDMA system. However, WCDMA air interface is specifically designed with envision to support real time multimedia services. To name some highlights, WCDMA: • Supports both packet-switched and circuitswitched data services. Mobile best-effort data services, such as Web surfing and file downloads, are available through packet service. • Has more bandwidth allocated for downlink and uplink than the 2G systems. It uses a 5 MHz wide radio signal and a chip rate of 3.84 mcps, which is about three times higher than CDMA2000. • Support a downlink data rate of 384 kbps for wide area coverage and up to 2 Mbps for hot-spot areas, which is sufficient for most existing packet-data applications. WCDMA Release 5 (Erricson, 2004) adopts HSDPA (High-speed downlink packet access), which increases peak data rates to 14 Mbps in the downlink. To achieve high data rate, WCDMA uses several new radio interface technologies, including (1) shared channel transmission, (2) higher-order modulation, (3) fast link adaptation, (4) fast scheduling, and (5) hybrid automatic-repeat-request (HARQ). These technologies have been successfully used in the downlink HSDPA, and will be used in upcoming improved uplink radio interface in the future. The rest of this article will explain the key components of the radio interface in WCDMA.

scholarly journals Design and Implementation of MPVLC Li-Fi Model for End-To-End Wireless Data Transmission

2020 ◽  
Vol 8 (5) ◽  
pp. 2834-2837
Keyword(s):  
Visible Light ◽  
Data Transmission ◽  
High Speed ◽  
Data Rate ◽  
Multimedia Data ◽  
High Data Rate ◽  
Network Coverage ◽  
High Data ◽  
Maximum Delay ◽  
Light Particles

Li-Fi system is a recent and brilliant technology which is utilized visible light as a medium for multimedia data transmission. In Li-Fi communication system, transfers data in the form of light signals as an alternative of Wi-Fi. The Li-Fi technology supports transmission of multimedia data in the way of light particles by sending the multimedia data via LED bulbs that make changes in faster transmission. The Li-Fi with hardware and software model creation with many parameters that must be considered while implementing a Li-Fi based transmission system prototype which is high data rate, distance and the LOS. These parameters are taken for major component when modelling a Light Fidelity system. The main problems in the implementation of an improved data rate at low network coverage and powerless location multi point VLC system and solar component are the range and cost effective model. The VLC source component and destination component must be compatible for high data rate. The conventional lighting technique in communication feels from intrusion and maximum delay possibilities. Solution for the above light based transmission problems in implementation; VLC is a preferred communication model because of its maximum throughput and secure transmission from light particles. The proposed Multi Point Visible Light Communication Li-Fi model provides high-speed communication to achieve better capacity, efficiency, and availability at low network coverage than existing lighting technology

scholarly journals Proactive Forwarding of High Data Rate in Smart Virtualization Networks for High-Speed Trains

2020 ◽  
Vol 14 (2) ◽  
pp. 1670-1681
Author(s):  
Fouad Ali Yaseen ◽  
Hamed S. Al-Raweshidy
Keyword(s):  
High Speed ◽  
Data Rate ◽  
High Data Rate ◽  
High Data ◽  
High Speed Trains

Design and Performance Evaluation of a 10GHz 32nm-CNTFET IR-UWB Transmitter for Inter-Chip Wireless Communication

2013 ◽  
Vol 646 ◽  
pp. 228-234
Author(s):  
Fahim Rahman ◽  
Prodyut Das ◽  
Md. Forhad Hossain ◽  
Sazzaduzzaman Khan ◽  
Rajib Chowdhury
Keyword(s):  
Performance Evaluation ◽  
High Speed ◽  
Pulse Generator ◽  
Field Effect Transistors ◽  
Logic Gates ◽  
Pulse Amplitude ◽  
Building Blocks ◽  
Data Rate ◽  
High Data ◽  
And Performance

In this paper, we have presented the design and performance evaluation of a 10GHz 32nm-CNTFET IR-UWB transmitter for inter-chip wireless transmission. We have designed the transmitter using a VCO-based high speed clock generator and a positive and a negative monocycle Gaussian pulse generator. RF compatible Carbon Nano-Tube Field Effect Transistors (CNTFETs) have been used as the building blocks of the oscillator and the logic gates. The final design has resulted to a 7-channel-SWNT CNTFET-based transmitter for optimum 10GHz data rate with a promising 650mV pulse amplitude and only 1.069mW power consumption with a -32.27dB output. This transmitter can also operate satisfactorily upto 15GHz. The results show promising superiority over existing transmitters regarding high data rate, low power loss and high pulse amplitude.

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