# US 12,113,571 B2 · Communication device and operating method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,113,571 B2 - Document ID: US12113571B2 - Status: Granted - Kind: B2 - Application number: 17/929,181 - Filed: 2022-09-01 - Published: 2023-04-06 - Granted: 2024-10-08 - Earliest claimed: 2021-10-06 - Assignees: NXP B.V. - Applicants: NXP B.V. - Inventors: Jan Dutz; Gert Holler; Wolfgang Küchler - Web page: https://patentgrep.com/patent/US12113571B2 ## CPC - H04B 1/71637: {Receiver aspects (H04B1/7183 takes precedence)} - H04B 1/7183: Synchronisation - H04B 1/1638: {Special circuits to enhance selectivity of receivers not otherwise provided for (resonant circuits H03H)} - H04B 1/7163: using impulse radio - H04B 2201/71634: Applied to ranging - H04B: TRANSMISSION ## Abstract In accordance with a first aspect of the present disclosure, a communication device is provided, comprising: a receiver circuit configured to receive a signal; a controller configured to control said receiver circuit, wherein said controller is configured to cause said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller is configured to cause said receiver circuit to operate in the real receiver mode until the signal is successfully acquired. In accordance with a second aspect of the present disclosure, a corresponding method of operating a communication device is conceived. ## Claims ### Claim 1 A communication device, comprising: a receiver circuit configured to receive a signal; a controller configured to control said receiver circuit, wherein said controller is configured to cause said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller is configured to cause said receiver circuit to operate in the real receiver mode until the signal is successfully acquired; wherein the controller is further configured to apply, when the receiver circuit operates in the real receiver mode, a local oscillator frequency which is different from a local oscillator frequency applied when the receiver operates in the complex receiver mode. ### Claim 2 (depends on 1) The device of claim 1, wherein the controller is further configured to cause the receiver circuit to use, in the complex receiver mode, an in-phase channel (I-channel) and a quadrature channel (Q-channel) of the received signal. ### Claim 3 (depends on 2) The device of claim 2, wherein the controller is further configured to cause the receiver circuit to use, in the real receiver mode, only said I-channel of the received signal or only said Q-channel of the received signal. ### Claim 4 (depends on 1) The device of claim 1, wherein the controller is further configured to switch the receiver circuit from the real receiver mode to the complex receiver mode upon or after a successful acquisition of the signal. ### Claim 5 (depends on 1) The device of claim 1, being an ultra-wideband (UWB) communication node acting as a responder in a communication system. ### Claim 6 A communication device, comprising: a receiver circuit configured to receive a signal; a controller configured to control said receiver circuit, wherein said controller is configured to cause said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller is configured to cause said receiver circuit to operate in the real receiver mode until the signal is successfully acquired; wherein the controller is further configured to switch the receiver circuit from the real receiver mode to the complex receiver mode upon or after a successful acquisition of the signal; wherein the successful acquisition of the signal is based on a detection of a synchronization field within said signal, wherein the synchronization field is included in a data frame. ### Claim 7 (depends on 6) The device of claim 6, wherein the controller is further configured to apply, when the receiver circuit operates in the real receiver mode, a local oscillator frequency which is different from a local oscillator frequency applied when the receiver operates in the complex receiver mode. ### Claim 8 (depends on 6) The device of claim 6, wherein the receiver circuit is configured to operate in the complex receiver mode by default, and wherein the controller is configured to switch the receiver circuit from the complex receiver mode to the real receiver mode if no signal is found within a predefined amount of time after the receiver circuit has started up. ### Claim 9 A communication device, comprising: a receiver circuit configured to receive a signal; a controller configured to control said receiver circuit, wherein said controller is configured to cause said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller is configured to cause said receiver circuit to operate in the real receiver mode until the signal is successfully acquired; wherein the controller is further configured to switch the receiver circuit from the real receiver mode to the complex receiver mode upon or after a successful acquisition of the signal; wherein the controller is further configured to wake up the receiver circuit before switching the receiver circuit from the real receiver mode to the complex receiver mode. ### Claim 10 (depends on 9) The device of claim 9, wherein the controller is further configured to apply, when the receiver circuit operates in the real receiver mode, a local oscillator frequency which is different from a local oscillator frequency applied when the receiver operates in the complex receiver mode. ### Claim 11 A communication device, comprising: a receiver circuit configured to receive a signal; a controller configured to control said receiver circuit, wherein said controller is configured to cause said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller is configured to cause said receiver circuit to operate in the real receiver mode until the signal is successfully acquired; wherein the controller is further configured to switch the receiver circuit from the real receiver mode to the complex receiver mode upon or after a successful acquisition of the signal; wherein the controller is further configured to wake up the receiver circuit after switching the receiver circuit from the real receiver mode to the complex receiver mode. ### Claim 12 A communication device, comprising: a receiver circuit configured to receive a signal: a controller configured to control said receiver circuit, wherein said controller is configured to cause said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller is configured to cause said receiver circuit to operate in the real receiver mode until the signal is successfully acquired; wherein the controller is further configured to switch the receiver circuit from the real receiver mode to the complex receiver mode upon or after a successful acquisition of the signal; wherein the controller is further configured to reset a center frequency upon or after switching the receiver circuit from the real receiver mode to the complex receiver mode. ### Claim 13 (depends on 12) The device of claim 12, wherein the receiver circuit is configured to operate in the complex receiver mode by default, and wherein the controller is configured to switch the receiver circuit from the complex receiver mode to the real receiver mode if no signal is found within a predefined amount of time after the receiver circuit has started up. ### Claim 14 A communication device, comprising: a receiver circuit configured to receive a signal; a controller configured to control said receiver circuit, wherein said controller is configured to cause said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller is configured to cause said receiver circuit to operate in the real receiver mode until the signal is successfully acquired; wherein the receiver circuit is configured to operate in the complex receiver mode by default, and wherein the controller is configured to switch the receiver circuit from the complex receiver mode to the real receiver mode if no signal is found within a predefined amount of time after the receiver circuit has started up. ### Claim 15 (depends on 14) The device of claim 14, wherein the controller is further configured to apply, when the receiver circuit operates in the real receiver mode, a local oscillator frequency which is different from a local oscillator frequency applied when the receiver operates in the complex receiver mode. ### Claim 16 A method of operating a communication device, wherein the communication device comprises a receiver circuit and a controller, the method comprising: receiving, by the receiver circuit, a signal; controlling, by the controller, the receiver circuit; wherein the controller causes said receiver circuit to operate either in a complex receiver mode or in a real receiver mode; wherein the controller causes said receiver circuit to operate in the real receiver mode until the signal is successfully acquired; wherein the controller applies, when the receiver circuit operates in the real receiver mode, a local oscillator frequency which is different from a local oscillator frequency applied when the receiver operates in the complex receiver mode. ### Claim 17 (depends on 16) The method of claim 16, wherein the controller causes the receiver circuit to use, in the complex receiver mode, an in-phase channel (I-channel) and a quadrature channel (Q-channel) of the received signal. ### Claim 18 (depends on 17) The method of claim 17, wherein the controller causes the receiver circuit to use, in the real receiver mode, only said I-channel of the received signal or only said Q-channel of the received signal. ### Claim 19 (depends on 16) The method of claim 16, wherein the controller switches the receiver circuit from the real receiver mode to the complex receiver mode upon or after a successful acquisition of the signal, wherein the successful acquisition of the signal is based on a detection of a synchronization field within said signal, wherein the synchronization field is included in a data frame. ### Claim 20 (depends on 16) The method of claim 16, wherein the controller switches the receiver circuit from the real receiver mode to the complex receiver mode upon or after a successful acquisition of the signal, wherein the controller wakes up the receiver circuit before switching the receiver circuit from the real receiver mode to the complex receiver mode.