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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. delivered the first production Evolved SEASPARROW Missile (ESSM) to the US Navy, defining the future of ship defense. "ESSM provides improved ship self-defense capabilities against faster, lower, smaller and more maneuverable anti-ship missile threats as well as increased firepower," said Capt. Ken Graber, the NATO SEASPARROW project...

Air Force Security Forces personnel supporting Operation Enduring Freedom have been equipped with the latest in Unmanned Aerial Vehicle (UAV) technology, the Force Protection Airborne Surveillance System (FPASS). The system allows security forces to see beyond base perimeters and can provide a rapid visual assessment of detected threats. The...

Loral Space and Communications announced that the US Navy's Space and Naval Warfare Systems Command (SPAWAR) has awarded a Space Systems/ Loral (SS/L) team, led by Raytheon, a $40 M Component Advanced Development (CAD) contract to develop the US Navy's $6 B, next-generation, satellite-based mobile communications system, the Mobile...

BAE Systems successfully launched a 2.75" laser guided rocket using a unique mid-body, fin-mounted, guidance system, scoring a "bull's-eye" hit on a small target more than three miles away from its launch point. The control test vehicle (CTV) was fired Sept. 29 at the Army's Yuma Proving Ground in...

UK contractor BAE Systems Command, Control, Communications, Computing, Intelligence, Surveillance and Reconnaissance (C4ISR) has delivered the first batch of six Talon satellite communications terminals to Paradigm Secure Communications for eventual use in the UK's Skynet 5 military communications satellite system. In all, 15 such terminals will be acquired, with...