Interference canceling for mobile devices

Abstract

A user-device implemented method includes encoding a first digital signal to generate a first digital baseband signal and modulate the first digital baseband signal to generate one or more RF signals corresponding to one or more frequency bands. The one or more RF signals are transmitted via one or more antennas. Substantially simultaneously with the transmission of the one or more RF signals, a second one or more RF signals is received via the one or more antennas. The second one or more RF signals are demodulated to generate a second digital baseband signal. The first digital baseband signal is subtracted from the second digital baseband signal to generate a modified second digital baseband signal.

1 . A user device comprising:
 a communication interface; and   one or more processors,   wherein the communication interface is configured to:
 receive, from the one or more processors, a transmit digital signal for transmission as one or more radio frequency (RF) signals; 
 encode the transmit digital signal to generate a transmit digital baseband signal; 
 modulate the transmit digital baseband signal to generate the one or more RF signals; 
 transmit, by a transmitter, the one or more RF signals via one or more antennas; 
 receive, by a receiver, and substantially simultaneously with the transmission of the one or more RF signals, a second one or more RF signals via the one or more antennas, 
 wherein the second one or more RF signals are in a carrier frequency band different from a carrier frequency band that includes the one or more RF signals; 
 demodulate the second one or more RF signals to generate a receive digital baseband signal; 
 subtract, by an interference canceling unit, following demodulation of the second one or more RF signals, potentially interfering effects of the one or more RF signals based on the transmit digital baseband signal from the receive digital baseband signal to generate a modified receive digital baseband signal; 
 decode the modified receive digital baseband signal to generate a decoded receive digital signal; and 
 forward the decoded receive digital signal to the one or more processors. 
   
     
     
         2 . The user device of  claim 1 , wherein at least one of the one or more radio frequency RF signals and the second one or more frequency RF signals include RF signals in more than one carrier frequency band. 
     
     
         3 . The user device of  claim 2 , wherein the more than one carrier frequency band include a first uplink band and a second downlink band, wherein the first uplink band has at least one harmonic in an interfering frequency range corresponding to the second downlink band. 
     
     
         4 . The user device of  claim 1 , wherein the interference canceling unit is further configured to:
 receive the transmit digital baseband signal; and   generate a potentially interfering signal based on some or all of the transmit digital baseband signal,   wherein the potentially interfering effects are subtracted from the receive digital baseband signal based on the potentially interfering signal.   
     
     
         5 . The user device of  claim 4 , wherein the interference canceling unit is configured to generate the potentially interfering signal by identifying time delay and/or phase shifts occurring from the transmitter to the receiver. 
     
     
         6 . The user device of  claim 4 , wherein the receive digital baseband signal includes more than one signal corresponding to more than one downlink frequency band, and
 wherein the interference canceling unit is further configured to:
 subtract the potentially interfering signal from fewer than all of the more than one receive digital baseband signals. 
   
     
     
         7 . The user device of  claim 1 , wherein the user device comprises a mobile communication device having telephone or data network capabilities. 
     
     
         8 . The user device of  claim 1 , wherein the user device supports carrier aggregation of more than one carrier frequency band for uplink and/or downlink. 
     
     
         9 . A mobile communication device-implemented method, comprising:
 encoding a first digital signal to generate a first digital baseband signal;   modulating the first digital baseband signal to generate one or more RF signals corresponding to one or more frequency bands;   transmitting the one or more RF signals via one or more antennas;   receiving, substantially simultaneously with the transmitting of the one or more RF signals, a second one or more RF signals via the one or more antennas,   wherein the second one or more RF signals are in a carrier frequency band different from a carrier frequency band that includes the one or more RF signals;
 demodulating the second one or more RF signals to generate a second digital baseband signal; and 
 subtracting potentially interfering effects of the one or more RF signals based on the first digital baseband signal from the second digital baseband signal to generate a modified second digital baseband signal. 
   
     
     
         10 . The method of  claim 9 , wherein at least one of the one or more radio frequency RF signals and the second one or more frequency RF signals each include RF signals in more than one carrier frequency band. 
     
     
         11 . The method of  claim 10 , wherein the more than one carrier frequency band include a first uplink band and a second downlink band, wherein the first uplink band includes at least one component that potential interferes with the second downlink band. 
     
     
         12 . The method of  claim 11 , wherein the at least one component comprises at least one harmonic of a carrier frequency range of the first uplink band. 
     
     
         13 . The method of  claim 9 , further comprising:
 receiving the first digital baseband signal by an interference canceling unit; and   generating a potentially interfering signal based on some or all of the first digital baseband signal,   wherein the subtracting further comprises subtracting the potentially interfering signal from the second digital baseband signal.   
     
     
         14 . The method of  claim 13 , further comprising:
 generating the potentially interfering signal by identifying time delay and/or phase shifts occurring between transmitting the first one or more RF signals and receiving the second one or more RF signals.   
     
     
         15 . The method of  claim 13 , wherein the second digital baseband signal includes two or more second digital baseband signals corresponding to two or more downlink frequency bands, and
 subtracting the potentially interfering signal from fewer than all of the two or more second digital baseband signals.   
     
     
         16 . A non-transitory computer-readable medium containing instructions executable by at least one processor, for causing the at least one processor to:
 encode a first digital signal to generate a first digital baseband signal;   modulate the first digital baseband signal to generate one or more RF signals corresponding to one or more frequency bands;   transmit the one or more RF signals via one or more antennas;   receive, substantially simultaneously with the transmission of the one or more RF signals, a second one or more RF signals via the one or more antennas,   wherein the second one or more RF signals are in a carrier frequency band different from a carrier frequency band that includes the one or more RF signals;   demodulate the second one or more RF signals to generate a second digital baseband signal; and   subtract potentially interfering effects of the one or more RF signals based on the first digital baseband signal from the second digital baseband signal to generate a modified second digital baseband signal.   
     
     
         17 . The computer-readable medium of  claim 16 , wherein at least one of the one or more radio frequency RF signals and the second one or more frequency RF signals include RF signals in more than one carrier frequency band. 
     
     
         18 . The computer-readable medium of  claim 17 , wherein the more than one carrier frequency band include a first uplink band and a second downlink band, wherein the first uplink band includes at least one component that potential interferes with the second downlink band. 
     
     
         19 . The computer-readable medium of  claim 16 , further comprising one or more instructions executable by at least one processor, that cause the at least one processor to:
 receive the first digital baseband signal; and   generate a potentially interfering signal based on some or all of the first digital baseband signal,   wherein the instructions that cause the at least one processor to subtract the first digital baseband signal further cause the at least one processor to subtract the potentially interfering signal from the second digital baseband signal.   
     
     
         20 . The computer-readable medium of  claim 19 , further comprising one or more instructions executable by at least one processor, that cause the at least one processor to:
 generate the potentially interfering signal by identifying time delay and/or phase shifts occurring between transmitting the first one or more RF signals and receiving the second one or more RF signals.