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posted in March 2002
Discrete Spectrum Techniques for Spectral Regrowth Analysis
News & Analysis  
3/14/2002   Post a comment
You can use discrete-spectrum signal representation to analyze distortion due to spectral regrowth in nonlinear devices, such as those found in wireless-communications systems. However, this technique introduces errors in both output bandwidth and power estimation of the spectral regrowth. Torben Larsen of Aalborg University, Denmark, shows how the bandwidth error may be large, but is predictable.
Efficient Near-Field to Far-Field Transformation Techniques for Antenna Measurements
Design How-To  
3/1/2002   Post a comment
Fernando Las-Heras of the Universidad Politcnica de Madrid, Ciudad Universitaria, and T.K. Sarkar of Syracuse University propose a new technique for Near-Field to Far-Field transformation for antenna measurements, using an equivalent current representation with a matrix-method solution. With this technique, the authors have obtained accuracy comparable to standard wave transformation methods.


Radio
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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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