Patent ID: 9432133
Filing Date: 2016-08-30
CPC Classification: G01R,H04B,H04L

Claim Text:
1. A method of characterizing multichannel signal generator performance employing orthogonal modulation, the method comprising: generating a first signal in a first channel of a multichannel signal generator, the first signal comprising a first set of subcarriers of an orthogonal frequency-division multiplexing (OFDM) digital modulation; generating a second signal in a second channel of the multichannel signal generator, the second signal comprising a second set of subcarriers of the OFDM digital modulation; combining the first signal and the second signal to produce a combined signal; receiving and demodulating the combined signal according to the OFDM digital modulation using a digital receiver; and determining a performance parameter of the second channel relative to the first channel from the received and demodulated combined signal, wherein the first set of subcarriers excludes a subcarrier of the second set of subcarriers and the second set of subcarriers excludes a subcarrier of the first set of subcarriers, wherein during generating the first and second signals, a selected pair of the subcarriers of the first subcarrier set is configured to be frequency adjacent to one another without an intervening subcarrier of the second subcarrier set to facilitate unwrapping phase within the digital receiver.