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Due to the fast growing demand for broadband wireless communications, the operating frequency is moving toward the 5 GHz U-NII band. With a maximum data rate of 54 Mbps, the IEEE 802.11a wireless LAN (WLAN) standard specifies a 300 MHz allocation of spectrum in the 5 GHz range that...

There are many ways of characterizing W-CDMA transmitter performance. However, the Third Generation Partnership Project (3GPP) specifications require two measurements to verify the in-channel modulation quality of W-CDMA transmitters - error vector magnitude (EVM) and peak code domain power (peak CDE). This article explores the purpose behind these key...

ANTENNAS Chuang, Huey-Ru, Liang-Chen Kuo, Chi-Chang Lin and Wen-Tzu Chen "A 2.4 GHz Polarization-diversity Planar Printed Dipole Antenna for WLAN and Wireless Communication Applications," No. 6, p. 50. Gunnels, Robert "Axial Ratio Measurements of Single Circularly Polarized Antennas," No. 1, p. 124. Izadian, Jamal S. "QFHA Antennas for Satellite...

Modern commercial and military communication systems require high efficiency, long term operating conditions. For this purpose, the power amplifiers, as final and highly current-consuming transmitter elements, are developed using the high efficiency class B, F or E modes of operation, depending on the technical requirements. In class B operation,...

The W-CDMA standard expresses transmit quality in terms of EVM and ACLR, and receive quality in bit error ratio (BER). These quality measurements are simple scalar numbers representing a very complicated system. Modern communications channels (still) consist of a number of concatenated functions such as baseband (BB) processor, DAC,...

Raytheon Co. is expanding its Reliability Analysis Laboratory (RAL) technical offerings with the incorporation of reliability engineering consulting services. Reliability is a core feature that can make or break the long term success of both products and companies. Design for Reliability (DFR) engineering tasks are just as important as...

Lockheed Martin received a $131 M funding increment to continue its leadership of the Battle Management/Command and Control/Communication (BM/C2/C) program for the Missile Defense Agency's (MDA) Missile Defense National Team. The contract runs through December of 2003 and funds the team's efforts to devise and field an operational structure...

Raytheon Co.'s first article ASR-11 digital airport surveillance radar (DASR) systems located at Eglin Air Force Base, FL, and Stockton, CA, have been accepted by the US Air Force. This contract milestone has been achieved through confirmation of compliant performance through testing. Acceptance of these first article systems clears...

Northrop Grumman Corp.'s Integrated System sector has been awarded a $49 M, nine-year contract by the US Air Force to provide Precision Guided Munitions Planning software (PGMPS). This program will give the Air Force a common, integrated personal computer-based mission planning application for all current and future USAF PGMs...

The University of Surrey's (Guildford, Surrey, England) acquisition of an Ultra High Vacuum Scanning Tunnelling Microscope/Scanning Electron Microscope (UHV STM/SEM) is being billed as a central figure to a £1.2 million future nanotechnology research project that is headed up by the institution's Professor of Solid-State Electronics, Ravi Silva. Built...