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Performance of wireless transceivers for high throughput and long range applications depends on several important factors such as transmit power, antenna configuration, and link quality and residual TX-RF impairments induced inside the TX/RX unit itself and most importantly on the chosen waveform. This paper proposes baseband architecture and methods to reduce residual TX-RF impairments. In particular,...
The military wireless systems often have specific constraints such as achieving very good receiver sensitivity, very high tolerance to frequency shifts and best possible dynamic range. Direct spread spectrum (DSS) is the proven threat free technology in many militarized wireless systems, which will also gives the advantage of good receiver sensitivity because of spreading gain it offers. The RF dynamic...
Prototyping of wireless radio is very important to demonstrate the features of any wireless radio before deployment. The core implementation stages of wireless radio prototype include physical layer digital baseband (DBB) processing, RF transceiver chip configuration and interfacing of baseband and RF. Flexibility and adaptivity are very much required in MIMO-OFDM based realtime prototypes, which...
Wireless communication systems beyond 3G are characterized by variety of applications which have the requirement of simultaneous transmission/reception of low data rate voice and high data rate video streaming content. Wireless applications such as live video chat requires more bandwidth for transmitting/receiving with high quality. The civilian/COTS cellular wireless systems are very promising and...
Orthogonal Frequency Division Multiple Access(OFDMA) has become the key physical layer technology forall future wireless standards including LTE, because of its highspectral efficiency and its capacity to combat multipath fading. Inspite of its advantages, one of the major drawbacks of OFDMAsystem is its high Peak to Average Power Ratio (PAPR) valuewhich is directly related to power consumption of...
Recent wireless broadband cellular standards are aimed at making provisions for supporting very high data rate applications in limited available bandwidth. The most sophisticated as well as computationally complex subsystem of a transceiver of any such system is the baseband processing part of the system. A multi-core processor is typically needed to provide the required computational power for implementing...
Energy consumption is an issue in general in information and communication technologies (ICT), but also cellular communications in particular. Base station sites are the main energy consumers in a mobile network. Their energy consumption significantly contributes to green house gas (Co2) emissions. It has been found that digital baseband is the main contributor to dynamic part of the power consumption...
Energy consumption is an issue in general in information and communication technologies (ICT), but also cellular communications in particular. Therefore there is a need for assessing the hardware implementation methods used for cellular from energy consumption perspective. OFDM is a bandwidth efficient multiple access method. It is being used by all forms of future wireless mobilela communication...
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