BACKGROUND

Field

Embodiments of the invention relate to electronic systems, and in particular, to radio frequency electronics.

Description of Related Technology

Radio frequency (RF) communication systems can be used for transmitting and/or receiving signals of a wide range of frequencies. For example, an RF communication system can be used to wirelessly communicate RF signals in a frequency range of about 30 kHz to 300 GHz, such as in the range of about 410 MHz to about 7.125 GHz for fifth generation (5G) frequency range 1 (FR1) communications.

Examples of RF communication systems include, but are not limited to, mobile phones, tablets, base stations, network access points, customer-premises equipment (CPE), laptops, and wearable electronics.

SUMMARY

In certain embodiments, the present disclosure relates to a mobile device. The mobile device includes a plurality of antennas including a first antenna and a second antenna, a plurality of front end systems including a first front end system and a second front end system, and a plurality of transceivers including a first transceiver and a second transceiver. The first front end system is configured to receive a radio frequency receive signal from the first antenna, and the second front end system is configured to provide a radio frequency transmit signal to the second antenna and to generate a radio frequency observation signal based on observing the radio frequency transmit signal. The second transceiver is configured to process the radio frequency observation signal to generate digital observation data for the first transceiver, and the first transceiver is configured to process the radio frequency receive signal to generate a baseband receive signal, and to compensate the baseband receive signal for an amount of radio frequency signal leakage indicated by the digital observation data.

In some embodiments, the digital observation data indicates an amount of direct transmit leakage present in the radio frequency transmit signal.

In various embodiments, the first transceiver includes a spectral regrowth modeling circuit configured to estimate an amount of aggressor spectral regrowth present in the radio frequency receive signal based on the digital observation data. According to a number of embodiments, the spectral regrowth modeling circuit is configured to estimate the amount of aggressor spectral regrowth based on modeling adjacent channel leakage ratio using predistortion.

In several embodiments, the second front end system includes a directional coupler configured to generate the radio frequency observation signal. According to some embodiments, the directional coupler generates the radio frequency observation signal based on a forward coupled path to the second antenna.

In various embodiments, the first front end system is a cellular front end system and the second front end system is a WiFi front end system.

In a number of embodiments, the first front end system is a WiFi front end system and the second front end system is a cellular front end system.

In some embodiments, the second transceiver is configured to compensate a second baseband receive signal for radio frequency signal leakage based on additional digital observation data from the first transceiver. According to various embodiments, the first transceiver receives a sensed radio frequency signal from a directional coupler of the first front end system, and processes the sensed radio frequency signal to generate the additional digital observation data. In accordance with a number of embodiments, the first front end system includes a duplexer, and the directional coupler is positioned between an output of the duplexer and the first antenna. According to several embodiments, the first front end system includes a duplexer and a power amplifier, the directional coupler positioned between an output of the power amplifier and an input to the duplexer.

In a number of embodiments, the first transceiver includes a discrete time cancellation circuit configured to compensate the baseband receive signal based on the digital observation data.

In certain embodiments, the present disclosure relates to a radio frequency communication system. The radio frequency communication system includes a first front end system configured receive a first incoming radio frequency receive signal and to output a first outgoing radio frequency transmit signal, and a second front end system configured to receive a second incoming radio frequency receive signal and to output a second outgoing radio frequency transmit signal, and to generate a radio frequency observation signal based on observing the second outgoing radio frequency transmit signal. The radio frequency communication system further includes a first transceiver configured to downconvert the first incoming radio frequency receive signal to generate a first baseband receive signal, and to compensate the first baseband receive signal for radio frequency signal leakage based on digital observation data, and a second transceiver configured to generate the digital observation data based on processing the radio frequency observation signal.

In some embodiments, the digital observation data indicates an amount of direct transmit leakage present in the second outgoing radio frequency transmit signal.

In various embodiments, the first transceiver includes a spectral regrowth modeling circuit configured to estimate an amount of aggressor spectral regrowth present in the first incoming radio frequency receive signal based on the digital observation data. According to a number of embodiments, the spectral regrowth modeling circuit is configured to estimate the amount of aggressor spectral regrowth based on modeling adjacent channel leakage ratio using predistortion.

In several embodiments, the second front end system includes a directional coupler configured to generate the radio frequency observation signal. According to some embodiments, the radio frequency communication system further includes an antenna, the directional coupler configured to generate radio frequency observation signal based on a forward coupled path to the antenna.

In a number of embodiments, the first front end system is a cellular front end system and the second front end system is a WiFi front end system.

In several embodiments, the first front end system is a WiFi front end system and the second front end system is a cellular front end system.

In some embodiments, the second transceiver is configured to compensate a second baseband receive signal for radio frequency signal leakage based on additional digital observation data from the first transceiver. According to a number of embodiments, the first transceiver receives a sensed radio frequency signal from a directional coupler of the first front end system, and generates the additional digital observation data based on processing the sensed radio frequency signal. In accordance with several embodiments, the radio frequency communication system further includes an antenna, the first front end system including a duplexer, the directional coupler positioned between an output of the duplexer and the antenna. According to various embodiments, the first front end system includes a duplexer and a power amplifier, and the directional coupler is positioned between an output of the power amplifier and an input to the duplexer.

In a number of embodiments, the first transceiver includes a discrete time cancellation circuit configured to compensate the first baseband receive signal based on the digital observation data.

In certain embodiments, the present disclosure relates to a method of coexistence management in a mobile device. The method includes providing a radio frequency receive signal from a first front end system to a first transceiver, generating a radio frequency transmit signal and a radio frequency observation signal using a second front end system, the radio frequency observation signal generated based on observing the radio frequency transmit signal, generating digital observation data based on the radio frequency observation signal using a second transceiver, downconverting the radio frequency receive signal to generate a baseband receive signal using the first transceiver, and compensating the baseband receive signal for radio frequency signal leakage based on the digital observation data using the first transceiver.

In various embodiments, the digital observation data indicates an amount of direct transmit leakage present in the radio frequency transmit signal.

In some embodiments, compensating the baseband receive signal includes processing the digital observation data using a spectral regrowth modeling circuit to estimate an amount of aggressor spectral regrowth present in the radio frequency receive signal. According to a number of embodiments, the method further includes estimating the amount of aggressor spectral regrowth based on modeling adjacent channel leakage ratio using predistortion.

In several embodiments, generating the radio frequency observation signal includes sensing the radio frequency transmit signal using a directional coupler.

In various embodiments, the first front end system is a cellular front end system and the second front end system is a WiFi front end system.

In a number of embodiments, the first front end system is a WiFi front end system and the second front end system is a cellular front end system.

In some embodiments, the method further includes compensating a baseband receive signal of the second transceiver for radio frequency signal leakage based on additional digital observation data from the first transceiver.

In several embodiments, compensating the baseband receive signal for radio frequency signal leakage includes providing discrete time cancellation based on the digital observation data.

