# US 2021/0175918 A1 · Radio receiver, method and computer program > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0175918 A1 - Document ID: US20210175918A1 - Status: Published application - Kind: A1 - Application number: 17/178,685 - Filed: 2021-02-18 - Published: 2021-06-10 - Earliest claimed: 2017-03-13 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Leif WILHELMSSON; Miguel LOPEZ; Henrik SJÖLAND - Web page: https://patentgrep.com/patent/US20210175918A1 ## CPC - H04B 1/16: Circuits - H04B 1/30: for homodyne or synchrodyne receivers (demodulator circuits H03D1/22) - H03D 7/165: {at least two frequency changers being located in different paths, e.g. in two paths with carriers in quadrature (combined with amplitude demodulation H03D1/2245, combined with angle demodulation H03D3/007; N-path filters H03H19/002)} - H04W 52/0229: {where the received signal is a wanted signal} - H04W 52/0235: {where the received signal is a power saving command} - H04W 52/0238: {where the received signal is an unwanted signal, e.g. interference or idle signal} - Y02D 30/70: in wireless communication networks - H04B: TRANSMISSION - H03D: DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C; details applicable to both modulators and frequency-changers H03C; demodulating pulses H03K9/00; transforming types of pulse modulation H03K11/00; coding, decoding or code conversion, in general H03M; repeater stations H04B7/14; demodulators adapted for AC systems of digital information transmission H04L27/00; synchronous demodulators adapted for colour television H04N9/66) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A radio receiver comprises a local oscillator arrangement and a controller. The local oscillator arrangement is arranged to provide a signal for down-conversion of radio frequency signal to an intermediate frequency or a baseband frequency in the radio receiver, and the local oscillator arrangement is capable of selectably providing multiple frequency generation qualities. The controller is arranged to estimate a tolerable frequency generation quality for the current operation of the radio receiver or determine whether the current operation of the radio receiver is satisfactory in sense of a currently provided frequency generation quality, and based on the estimation or determination adjust frequency generation quality of the local oscillator arrangement by selecting one of the multiple frequency generation qualities. A radio arrangement, a method and a computer program are also disclosed. ## Claims ### Claim 1 A radio receiver arranged to operate as a wakeup receiver for a main receiver interacting with the radio receiver, the radio receiver comprising: a local oscillator arrangement, the local oscillator arrangement being configured to provide a signal for down-conversion of a radio frequency signal to one of an intermediate frequency and a baseband frequency in the radio receiver, and the local oscillator arrangement being configured to selectively provide multiple frequency generation qualities; and a controller, the controller being configured to select a frequency generation quality of the provided multiple frequency generation qualities based at least in part on an estimated adjacent channel interference power. ### Claim 2 (depends on 1) The radio receiver of claim 1, wherein the controller is further configured to periodically cause the main receiver to tune to an adjacent channel that may cause reciprocal mixing and to provide information about signals on the adjacent channel. ### Claim 3 (depends on 2) The radio receiver of claim 2, wherein the periodic tuning to an adjacent channel comprises causing the main receiver to scan adjacent channels for signals that may cause reciprocal mixing. ### Claim 4 (depends on 2) The radio receiver of claim 2, wherein the periodic tuning to an adjacent channel comprises causing the main receiver to check a wide bandwidth for signals that may cause reciprocal mixing, wherein the wide bandwidth covers the adjacent channels that may cause reciprocal mixing. ### Claim 5 (depends on 1) The radio receiver of claim 1, wherein the local oscillator arrangement comprises multiple local oscillator generation circuits where the selection of a frequency generation quality includes selection of one of the local oscillator generation circuits. ### Claim 6 (depends on 5) The radio receiver of claim 5, wherein each of the local oscillator generation circuits are associated with a power consumption for a respective selected frequency generation quality. ### Claim 7 (depends on 1) The radio receiver of claim 1, wherein the local oscillator arrangement is capable of selectably providing multiple frequency generation qualities by selecting a local oscillator generation circuit of the local oscillator arrangement. ### Claim 8 (depends on 7) The radio receiver of claim 7, wherein selecting a local oscillator generation circuit comprises selecting selectable operation parameters and selectable circuit parameters for the local oscillator generation circuit. ### Claim 9 (depends on 8) The radio receiver of claim 8, wherein the selectable operating parameters comprise biasing of the local oscillator generation circuit. ### Claim 10 (depends on 8) The radio receiver of claim 8, wherein the selectable circuit parameters comprise any of selectable impedances and selectable active circuit elements. ### Claim 11 A method of a radio receiver comprising a local oscillator arrangement configured to provide a signal for down-conversion of a radio frequency signal to one of an intermediate frequency and a baseband frequency in the radio receiver, the local oscillator arrangement being configured to provide multiple frequency generation qualities, the method comprising: selecting a frequency generation quality of the provided multiple frequency generation qualities based at least in part on an estimated adjacent channel interference power; and adjusting the frequency generation quality of the local oscillator arrangement according to the selection. ### Claim 12 (depends on 11) The method of claim 11, further comprising periodically causing a main receiver to tune to an adjacent channel that may cause reciprocal mixing and to provide information about signals on the adjacent channel. ### Claim 13 (depends on 12) The method of claim 12, wherein the periodic tuning to an adjacent channel comprises causing the main receiver to scan adjacent channels for signals that may cause reciprocal mixing. ### Claim 14 (depends on 12) The method of claim 12, wherein the periodic tuning to an adjacent channel comprises causing the main receiver to check a wide bandwidth for signals that may cause reciprocal mixing, wherein the wide bandwidth covers the adjacent channels that may cause reciprocal mixing. ### Claim 15 (depends on 11) The method of claim 11, wherein the local oscillator arrangement comprises multiple local oscillator generation circuits where the selection of the frequency generation quality includes selection of one of the local oscillator generation circuits. ### Claim 16 (depends on 15) The method of claim 15, wherein each of the local oscillator generation circuits are associated with a power consumption for a respective selected frequency generation quality. ### Claim 17 (depends on 11) The method of claim 11, wherein the local oscillator arrangement is capable of selectably providing multiple frequency generation qualities by selecting a local oscillator generation circuit of the local oscillator arrangement. ### Claim 18 (depends on 17) The method of claim 17, wherein selecting a local oscillator generation circuit comprises selecting selectable operating parameters and selectable circuit parameters for the local oscillator generation circuit. ### Claim 19 (depends on 18) The method of claim 18, wherein the selectable operating parameters comprise biasing of the local oscillator generation circuit. ### Claim 20 (depends on 18) The method of claim 18, wherein the selectable circuit parameters comprise any of selectable impedances and selectable active circuit elements. ### Claim 21 A computer-readable medium storing a computer program comprising instructions which, when executed on a processor of a controller of a radio receiver comprising a local oscillator arrangement configured to provide a signal for down-conversion of radio frequency signal to one of an intermediate frequency and a baseband frequency in the radio receiver, the local oscillator arrangement being configured to provide multiple frequency generation qualities, causes the radio receiver to: select a frequency generation quality of the provided multiple frequency generation qualities based at least in part on an estimated adjacent channel interference power; and adjust the frequency generation quality of the local oscillator arrangement according to the selection of the frequency generation quality.