FUTURE TRENDS OF MOBILE AND PERSONAL COMMUNICATIONS (Invited Paper) Theodore S. Rappaport Mobile & Portable Radio Research Group Bradley Department of Electrical Engineering Virginia Tech Blacksburg, VA 24061-0350 email: [email protected] This tutorial paper provides an overview of the fundamental concepts used in cellular radio communications, and illustrates the likely evolution and growth of t...

  Background: Gestational diabetes mellitus (GDM) is a form of diabetes that occurs in pregnancy. GDM, defined as glucose intolerance, first diagnosed or initiated during pregnancy affects 1-14% of pregnancies based on various studies. Screening and early diagnosis and appropriate glycemic control can improve prenatal outcomes. Telephone follow-up seems to be a reasonable way for pregnant women...

The DECT Standard Cipher (DSC) is a proprietary 64-bit stream cipher based on irregularly clocked LFSRs and a non-linear output combiner. The cipher is meant to provide confidentiality for cordless telephony. This paper illustrates how the DSC was reverse-engineered from a hardware implementation using custom firmware and information on the structure of the cipher gathered from a patent. Beyond...

Propagation characteristics play a fundamental role in the design and implementation of radio systems. The application of broadband digital data services within the cordless environment requires close consideration of the dispersive nature of radio channels. A prediction algorithm is presented such that propagation characteristics can be estimated for small cell high data rate systems. Through ...

This paper describes a 1.9 GHz, 25 mW , 0.25 μm CMOS Low Noise Amplifier (LNA), intended for use in a DECT (Digital Enhanced Cordless Communications) Receiver. The LNA has been simulated with Cadence Spectre and the results show that it provides a gain of more than 15 dB, for a noise figure of 2dB, and an input referred IP3 of −5dBm. We present the LNA architecture and the circuit analysis alon...

The quadrature modulator is a fundamental radio component for worldwide digital wireless communication standards such as Global System for Mobile Communications (GSM), Digital Communications SystemsÐ1800 MHz (DCS1800), Digital European Cordless Telecommunications (DECT), American and Personal Digital Cellular (ADC/PDC), Japanese Personal Handy Phone (PHP RCR28). A typical system application and...

Research department at Encsson Radw Systems. igital cellular andmicrocellularradio systems must incorporate multiple accessschemes that make efficient use of the allocated bandwidth and radio cell infrastructure with minimum cost and maximum performance 111. Time Division M u l l i ~ l e Access (TDMA) is thk multiple access techn6ue of choice for several digital cellular and PCS systcms. For ex...

The complexity of modern products and design tools has complicated the exchange of design information. It is widely recognized that the capture, storage, and retrieval of design information is one of the major challenges for the next generation of computer aided design tools. This paper presents a model for the flow of design information that supports a semantics-based approach for developing i...

Whip type antennas are probably the most commonly used antennas in portable RF systems, such as cordless and cellular phones, RF enabled laptop computers, , and handheld computers. Whip antennas are almost always mounted on the chassis which contains the radio and other electronics. Normally in mobile phone two set of antenna used for receiving different application such as GSM and GPS. In this...