Phase-noise test options for wireless broadband

摘要

The wireless communication industry is moving toward higher RF frequencies and data rates through more complex modulation and wider modulation bandwidths. Successful emerging broadband wireless systems must be supported by reliable measurement technology. Error vector magnitude (EVM) is a critical spec often used to describe a transmitted signal's modulation quality. EVM measures the difference between an ideal, reference waveform and the measured waveform. If a receiver has a poor EVM, its ability to properly recover the transmitted signal is reduced, which increases the bit error rate (BER) at the edge of a cell, and thus reduces the area of coverage.