# US 10,771,098 B2 · Method for determining phase noise in a periodically modulated signal > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,771,098 B2 - Document ID: US10771098B2 - Status: Granted - Kind: B2 - Application number: 16/159,350 - Filed: 2018-10-12 - Published: 2020-04-16 - Granted: 2020-09-08 - Earliest claimed: 2018-10-12 - Assignees: Rohde & Schwarz GmbH & Co. KG - Applicants: Rohde & Schwarz GmbH & Co. KG - Inventors: Luke Cirillo; Andreas Lagler; Alexander Breitenfeld - Web page: https://patentgrep.com/patent/US10771098B2 ## CPC - G01S 7/4008: {of transmitters} - H04B 1/10: Means associated with receiver for limiting or suppressing noise or interference - G01S 13/343: {using sawtooth modulation} - H03B 5/1847: {the active element in the amplifier being a semiconductor device} - H04L 1/205: {jitter monitoring} - H04L 1/206: {for modulated signals} - G01S 13/345: {using triangular modulation} - H03B 2200/009: Reduction of phase noise - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - H04B: TRANSMISSION - H03B: GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS (generators adapted for electrophonic musical instruments G10H; masers or lasers H01S; generation of oscillations in plasma H05H) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A method for determining phase noise in a periodically modulated signal is described. The modulated signal is processed to generate a processed signal from the modulated signal. At least an approximate period of a modulation of the modulated signal is determined from the processed signal. The type of modulation of the modulated signal is determined from the processed signal. The modulated signal is demodulated based on the determined period and the determined type of modulation to generate a demodulated signal, and the phase noise is determined from the demodulated signal. Moreover, a measurement device is described. ## Claims ### Claim 1 A method for determining phase noise in a periodically modulated signal, the method comprising the following steps: processing the periodically modulated signal to generate a processed signal from the periodically modulated signal; determining at least an approximate period of a modulation of the periodically modulated signal from the processed signal; determining a type of modulation of the periodically modulated signal from the processed signal; demodulating the modulated signal based on the determined period and the determined type of modulation to generate a demodulated signal, wherein the demodulated signal corresponds to a continuous wave signal containing the phase noise to be quantified; and determining the phase noise from the demodulated signal. ### Claim 2 (depends on 1) The method of claim 1, wherein the periodically modulated signal is digitized to generate the processed signal. ### Claim 3 (depends on 1) The method of claim 1, wherein the type of modulation of the periodically modulated signal is assigned to a family of quadrature amplitude modulations. ### Claim 4 (depends on 1) The method of claim 1, wherein the type of modulation of the periodically modulated signal is assigned to at least one of a family of phase modulations and a family of frequency modulations. ### Claim 5 (depends on 1) The method of claim 1, wherein the approximate period is determined by an autocorrelation of the processed signal. ### Claim 6 (depends on 5) The method according to claim 5, wherein at least one local maximum of an autocorrelation function resulting from the autocorrelation of the processed signal is approximated via a model. ### Claim 7 (depends on 1) The method of claim 1, wherein the demodulated signal is averaged over a time interval being a multiple of the determined approximate period to determine the phase noise. ### Claim 8 (depends on 1) The method of claim 1, wherein the phase noise is determined for specific samples in the processed signal corresponding to specific frequency offsets. ### Claim 9 (depends on 8) The method of claim 8, wherein the phase noise is determined for several frequency offsets that are different from each other. ### Claim 10 (depends on 1) The method of claim 1, wherein the phase noise is visualized together with the periodically modulated signal. ### Claim 11 (depends on 1) The method of claim 1, wherein the periodically modulated signal is processed using at least one of a radio frequency signal analyzer or an oscilloscope. ### Claim 12 (depends on 1) The method of claim 1, wherein an amplitude noise is determined from the demodulated signal. ### Claim 13 A measurement device, comprising: an input channel, a processing unit, a demodulation unit and a noise analysis unit, the input channel being configured to receive an input signal and to forward the input signal to the processing unit, the processing unit being configured to process the input signal to generate a processed signal from the input signal and to forward the processed input signal to the demodulation unit, the demodulation unit being configured to determine a type and a period of a modulation of the input signal to generate a demodulated signal by demodulating the processed signal based on the period and the type of modulation and to forward the demodulated signal to the noise analysis unit, wherein the demodulated signal corresponds to a continuous wave signal containing the phase noise to be quantified, and the noise analysis unit being configured to determine at least one of a phase noise and an amplitude noise of the demodulated signal. ### Claim 14 (depends on 13) The measurement device of claim 13, wherein the measurement device is established by at least one of a radio frequency signal analyzer or an oscilloscope. ### Claim 15 (depends on 13) The measurement device of claim 13, wherein the processing unit comprises an analog-to-digital converter. ### Claim 16 (depends on 13) The measurement device of claim 13, wherein the demodulation unit is configured to generate an autocorrelation of the processed signal. ### Claim 17 A method for determining phase noise in a periodically modulated signal, the method comprising the following steps: processing the periodically modulated signal to generate a processed signal from the periodically modulated signal; determining at least an approximate period of a modulation of the periodically modulated signal from the processed signal, wherein the approximate period of the modulation of the periodically modulated signal is determined by an autocorrelation of the processed signal; determining a type of modulation of the periodically modulated signal from the processed signal; demodulating the modulated signal based on the determined period and the determined type of modulation to generate a demodulated signal; and determining the phase noise from the demodulated signal.