Interference suppression in a radio transceiver device

Abstract

There is provided mechanisms performed by a control device for suppressing interference in a received reception signal in a radio transceiver device. The radio transceiver device is configured to receive the reception signal as a radio reception signal and to generate a radio transmission signal. The radio transmission signal and the radio reception signal occupy at least partly non-overlapping frequency bands. A method comprises obtaining a transmission reference signal based on the radio transmission signal. The method comprises estimating an interference distortion component signal based on the transmission reference signal and on a model of nonlinearity in a radio circuit of the radio transceiver device. The method comprises suppressing interference in the reception signal by combining the reception signal with the distortion component signal.

1 . A method performed by a control device for suppressing interference in a received reception signal S Tot  in a radio transceiver device configured to receive the reception signal S Tot  as a radio reception signal S Tot-RF  and to generate a radio transmission signal S Tx-RF , wherein the radio transmission signal S Tx-RF  and the radio reception signal S Tot-RF  occupy at least partly non-overlapping frequency bands, the method comprising:
 obtaining a transmission reference signal S Tx  based on the radio transmission signal S Tx-RF ;   estimating an interference distortion component signal Ŝ CM  based on the transmission reference signal S Tx  and on a model of nonlinearity in a radio circuit of the radio transceiver device; and   suppressing interference in the reception signal S Tot  by combining the reception signal S Tot  with the distortion component signal Ŝ CM .   
     
     
         2 . The method according to  claim 1 , wherein combining the reception signal S Tot  with the distortion component signal Ŝ CM  results in a compensated reception signal S Comp . 
     
     
         3 . The method according to  claim 1 , wherein the interference distortion component signal Ŝ CM  is an estimation of cross modulation in a receiver branch of the radio transceiver device. 
     
     
         4 . The method according to  claim 1 , wherein the reception signal S Tot  comprises a desired radio reception signal S Rx-RF  and an internal leakage contribution, as modelled by the model, of the radio transmission signal S Tx-RF . 
     
     
         5 . The method according to  claim 2 , wherein the compensated reception signal S Comp  is determined so as to compensate the reception signal S Tot  for the internal leakage contribution h(S Tx-RF ). 
     
     
         6 . The method according to  claim 1 , wherein the interference distortion component signal Ŝ CM  represents at least one non-linear component f in the radio circuit. 
     
     
         7 . The method according to  claim 2 , wherein the interference distortion component signal Ŝ CM  is estimated by minimizing an error signal e based on a difference between the compensated reception signal S Comp  and a receiver signal. 
     
     
         8 . The method according to  claim 7 , wherein the receiver signal is a filtered receiver signal S Rx  and determined by:
 filtering the compensated reception signal S Comp , resulting in the filtered receiver signal Ŝ Rx .   
     
     
         9 . The method according to  claim 7 , further comprising:
 processing the filtered receiver signal Ŝ Rx  by a detector, resulting in a detected receiver signal S Rx,Dec , and   wherein the difference is determined between the filtered receiver signal Ŝ Rx  and the detected receiver signal S Rx,Dec .   
     
     
         10 . The method according to  claim 6 , wherein the interference distortion component signal Ŝ CM  is estimated using a least means squares estimate based on the error signal e. 
     
     
         11 . The method according to  claim 1 , wherein the radio transmission signal S Tx-RF  is more than one order of magnitude larger in power than the radio reception signal S Tot-RF . 
     
     
         12 . The method according to  claim 1 , wherein the model is based on band-stop filtering of the radio transmission signal S Tx-RF . 
     
     
         13 . The method according to  claim 4 , wherein the reception signal S Tot  further comprises an external leakage contribution S Adj-RF  of another radio reception signal, wherein the desired radio reception signal S Rx-RF  and said another radio reception signal are located on neighbouring carrier frequencies. 
     
     
         14 . A control device for suppressing interference in a received reception signal S Tot  in a radio transceiver device configured to receive the reception signal S Tot  as a radio reception signal S Tot-RF  and to generate a radio transmission signal S Tx-RF , wherein the radio transmission signal S Tx-RF  and the radio reception signal S Tot-RF  occupy at least partly non-overlapping frequency bands, the control device comprising processing circuitry, the processing circuitry being configured to cause the control device to:
 obtain a transmission reference signal S Tx  based on the radio transmission signal S Tx-RF ;   estimate an interference distortion component signal Ŝ CM  based on the transmission reference signal S Tx  and on a model of nonlinearity in a radio circuit of the radio transceiver device; and   suppress interference in the reception signal S Tot  by combining the reception signal S Tot  with the distortion component signal Ŝ CM .   
     
     
         15 . A control device for suppressing interference in a received reception signal S Tot  in a radio transceiver device configured to receive the reception signal S Tot  as a radio reception signal S Tot-RF  and to generate a radio transmission signal S Tx-RF , wherein the radio transmission signal S Tx-RF  and the radio reception signal S Tot-RF  occupy at least partly non-overlapping frequency bands, the control device comprising:
 processing circuitry; and   a computer program product storing instructions that, when executed by the processing circuitry, causes the control device to:
 obtain a transmission reference signal S Tx  based on the radio transmission signal S Tx-RF ; 
 estimate an interference distortion component signal Ŝ CM  based on the transmission reference signal S Tx  and on a model of nonlinearity in a radio circuit of the radio transceiver device; and 
 suppress interference in the reception signal S Tot  by combining the reception signal S Tot  with the distortion component signal Ŝ CM . 
   
     
     
         16 . A control device for suppressing interference in a received reception signal S Tot  in a radio transceiver device configured to receive the reception signal S Tot  as a radio reception signal S Tot-RF  and to generate a radio transmission signal S Tx-RF , wherein the radio transmission signal S Tx-RF  and the radio reception signal S Tot-RF  occupy at least partly non-overlapping frequency bands, the control device comprising:
 an obtain module configured to obtain a transmission reference signal S Tx  based on the radio transmission signal S Tx-RF ;   an estimate module configured to estimate an interference distortion component signal Ŝ CM  based on the transmission reference signal S Tx  and on a model of nonlinearity in a radio circuit of the radio transceiver device; and   a suppress module configured to suppress interference in the reception signal S Tot  by combining the reception signal S Tot  with the distortion component signal Ŝ CM .   
     
     
         17 . (canceled) 
     
     
         18 . For suppressing interference in a received reception signal S Tot  in a radio transceiver device configured to receive the reception signal S Tot  as a radio reception signal S Tot-RF  and to generate a radio transmission signal S Tx-RF , wherein the radio transmission signal S Tx-RF  and the radio reception signal S Tot-RF  occupy at least partly non-overlapping frequency bands, a non-transitory computer-readable storage medium comprising a computer program product including instructions to cause processing circuitry to:
 obtain a transmission reference signal S Tx  based on the radio transmission signal S Tx-RF ;   estimate an interference distortion component signal Ŝ CM  based on the transmission reference signal S Tx  and on a model of nonlinearity in a radio circuit of the radio transceiver device; and   suppress interference in the reception signal S Tot  by combining the reception signal S Tot  with the distortion component signal Ŝ CM .   
     
     
         19 . (canceled)