Coexistence management for radio frequency communication systems
Radio frequency (RF) communication systems with coexistence management are provided herein. In certain embodiments, a method of coexistence management includes generating an RF observation signal based on observing a cellular transmit signal using a cellular front end system, processing the RF observation signal to generate digital observation data using a cellular transceiver, generating a digital wireless local area network (WLAN) receive signal based on processing an RF WLAN receive signal using a WLAN transceiver, compensating the digital baseband WLAN receive signal for RF signal leakage based on the digital observation data using a discrete time cancellation circuit of the WLAN transceiver.
1 . A mobile device comprising:
a cellular front end system configured to generate a radio frequency observation signal based on observing a cellular transmit signal;
a cellular transceiver configured to process the radio frequency observation signal to generate digital observation data; and
a wireless local area network transceiver configured to generate a digital wireless local area network receive signal based on processing a radio frequency wireless local area network receive signal, the wireless local area network transceiver including a discrete time cancellation circuit configured to compensate the digital wireless local area network receive signal for radio frequency signal leakage based on the digital observation data, the discrete time cancellation circuit including a spectral regrowth modeling circuit configured to estimate an amount of aggressor spectral regrowth present in the radio frequency wireless local area network receive signal based on the digital observation data.
2 . The mobile device of claim 1 wherein the cellular transceiver is further configured to generate a digital observation signal based on the radio frequency observation signal, and to sample the digital observation signal to generate the digital observation data.
3 . The mobile device of claim 1 wherein the digital observation data reflects an amount of direct transmit leakage present in the cellular transmit signal.
4 . The mobile device of claim 1 wherein the cellular front end system includes a directional coupler configured to generate the radio frequency observation signal based on sensing the cellular transmit signal.
5 . The mobile device of claim 4 further comprising an antenna, the directional coupler further configured to generate the radio frequency observation signal based on a forward coupled path to the antenna.
6 . The mobile device of claim 1 further comprising a wireless local area network front end system configured to provide the radio frequency wireless local area network receive signal to the wireless local area network transceiver.
7 . The mobile device of claim 6 further comprising a first antenna coupled to the wireless local area network front end system.
8 . The mobile device of claim 7 further comprising a second antenna coupled to the cellular front end system.
9 . The mobile device of claim 1 wherein the wireless local area network transceiver is a WiFi transceiver.
10 . A method of coexistence management in a mobile device, the method comprising:
generating a radio frequency observation signal based on observing a cellular transmit signal using a cellular front end system;
processing the radio frequency observation signal to generate digital observation data using a cellular transceiver;
generating a digital wireless local area network receive signal based on processing a radio frequency wireless local area network receive signal using a wireless local area network transceiver; and
compensating the digital baseband wireless local area network receive signal for radio frequency signal leakage based on the digital observation data using a discrete time cancellation circuit of the wireless local area network transceiver, including using a spectral regrowth modeling circuit of the discrete time cancellation circuit to estimate an amount of aggressor spectral regrowth present in the radio frequency wireless local area network receive signal based on the digital observation data.
11 . The method of claim 10 wherein processing the radio frequency observation signal further includes generating a digital observation signal based on the radio frequency observation signal, and sampling the digital observation signal to generate the digital observation data.
12 . The method of claim 10 wherein the digital observation data reflects an amount of direct transmit leakage present in the cellular transmit signal.
13 . The method of claim 10 wherein generating the radio frequency observation signal includes sensing the cellular transmit signal using a directional coupler.
14 . The method of claim 13 wherein generating the radio frequency observation signal further includes using the directional coupler to sense a forward coupled path to an antenna.
15 . The method of claim 10 further comprising providing the radio frequency wireless local area network receive signal from a wireless local area network front end system to the wireless local area network transceiver.
16 . The method of claim 10 further comprising receiving the radio frequency wireless local area network receive signal on a first antenna.
17 . The method of claim 16 further comprising transmitting the cellular transmit signal on a second antenna.
18 . The method of claim 10 wherein the wireless local area network transceiver is a WiFi transceiver.
19 . A wireless local area network transceiver comprising:
a wireless local area network receive channel configured to process a radio frequency wireless local area network receive signal from a wireless local area network front end system to generate a digital wireless local area network receive signal;
an input configured to receive digital observation data from a cellular transceiver; and
a discrete time cancellation circuit configured to compensate the digital wireless local area network receive signal for radio frequency signal leakage based on the digital observation data, the discrete time cancellation circuit including a spectral regrowth modeling circuit configured to estimate an amount of aggressor spectral regrowth present in the radio frequency wireless local area network receive signal based on the digital observation data.
20 . The wireless local area network transceiver of claim 19 wherein the digital observation data reflects an amount of direct transmit leakage present in a cellular transmit signal.