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The problem that needs to be consider in a multi user distributive and decentralized network is the interception of transmitted signals by an undesirable node. A decentralized system is nothing but a data processing system in which all information is processed locally without the need for a Central Processing Facility where various effects like multipath and scattering causes non- orthogonality of...
A power/area aware design is mandatory for the MIMO (Multi-Input Multi-Output) detectors used in LTE and WiMAX standards. The 64-QAM modulation used in the MIMO detector requires more detection effort compared to the smaller constellation sizes widely implemented in the literature. In this work we propose a new architecture for the K-best detector, which unlike the popular multi-stage architecture...
This paper is concerned with the challenging and timely problem of channel estimation for orthogonal frequency division multiplexing (OFDM) systems in the presence of frequency selective and very rapidly time varying channels. In OFDM systems operating over rapidly time-varying channels, the orthogonality between subcarriers is destroyed leading to inter-carrier interference (ICI) and resulting in...
The design of CMOS power amplifiers (PAs) is still a challenging task. In this paper, a broadband amplifier for wireless applications in a 90 nm CMOS process is presented. The PA uses class-E topology to exploit its soft-switching property for high efficiency. The differential amplifier is based on a finite DC-feed inductance concept and includes an on-chip output balun. The circuit has been integrated...
The proliferation of mobile standards and frequencies is complicating handset design. Can a programmable approach help, and what are the implications for RF and antenna design? Cellular operators are gearing up for a new round of network upgrades. This year sees continued deployment of an enhancement to third-generation cellular (3G), called HSPA+, which can provide peak data-transfer rates of 21Mbit/s...
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