David A. Hall
 Write for Microwaves & RF
2 results found for David A. Hall, displaying items 1 - 2

May 2009   [Communications]
Understanding Benefits Of MIMO Technology
Multiple-input, multiple-output (MIMO) antenna systems are used in modern wireless standards, including in IEEE 802.11n, 3GPP LTE, and mobile WiMAX systems. The technique supports enhanced data throughput even under conditions of interference, signal fading, and multipath. The demand for higher data rates over longer distances has been one of the primary motivations behind the development of MIMOorthogonal- frequency-division-multiplexing (OFDM)...

December 2008   [Test & Measurement]
Test Radio Receivers With Recorded Signals
Channel impairments can be disruptive on RF-based communications devices. Impairments such as fading and multipath, which are often unpredictable, can hinder wireless communications. Because channel impairments are often unpredictable and not repeatable, many engineers face the challenge of supplying a prototype receiver with a reliable model of the real-world signal environment. Fortunately, by understanding the causes of these impairments through...