Radio frequency receiver and receiving method

Abstract

The present invention discloses a radio frequency receiver and a receiving method, where the method includes: performing band splitting on a radio frequency signal of multiple carriers to obtain at least one band signal, and outputting the signal; separately performing filtering and amplification processing on the at least one band signal to obtain at least one processed signal; generating multiple oscillation signals; and selectively receiving a processed signal, of the at least one processed signal, that includes a target carrier; receiving an oscillation signal corresponding to the target carrier; selectively selecting a frequency division ratio from multiple frequency division ratios; using the frequency division ratio to perform frequency division on the received oscillation signal to obtain a local oscillator signal; using the local oscillator signal to perform frequency mixing on the received processed signal that includes the target carrier to obtain a mixed signal.

What is claimed is: 
     
       1. A radio frequency receiver comprising:
 a band splitter, wherein an input end of the band splitter is coupled to an antenna, and the band splitter is configured to receive a radio frequency signal from the antenna, perform band splitting on the radio frequency signal to obtain at least one band signal, and output the at least one band signal, wherein the radio frequency signal is a carrier aggregated signal of multiple carriers, and each band signal comprises at least one carrier of the multiple carriers;   a processing circuit, wherein the processing circuit is coupled to an output end of the band splitter, and is configured to separately perform filtering and amplification processing on the at least one band signal to obtain at least one processed signal;
 multiple frequency synthesizers configured to generate multiple oscillation signals; and 
 multiple receiving channels, wherein each of the multiple receiving channels is associated with one of the multiple frequency synthesizers in a one-to-one manner, and any of the multiple receiving channels is configured to: 
 selectively receive a processed signal from the processing circuit that comprises a target carrier of the any receiving channel; 
   receive an oscillation signal generated by a frequency synthesizer associated with the any receiving channel;
 selectively select a frequency division ratio of the any receiving channel from multiple frequency division ratios; 
 use the frequency division ratio to perform frequency division on the received oscillation signal to obtain a local oscillator signal of the any receiving channel; 
 use the local oscillator signal to perform frequency mixing on the received processed signal that comprises the target carrier to obtain a mixed signal; and 
 generate, based on the mixed signal, a baseband signal associated with the target carrier, wherein the target carrier is one of the multiple carriers comprised in the radio frequency signal, and 
 the multiple receiving channels suppress mutual interference between the multiple frequency synthesizers by separately selecting their respective frequency division ratios, 
 wherein any of the receiving channels selects the frequency division ratio and a mutual pulling effect between an oscillation signal generated by one of the frequency synthesizers corresponding to any of the receiving channels and another oscillation signal among the multiple oscillation signals, except the oscillation signals corresponding to any of the receiving channels are suppressed and no superimposition occurs between the target carrier of any of the receiving channels and a signal obtained after any of the receiving channels performs frequency division on a spurious component of the another oscillation signal. 
   
     
     
       2. The radio frequency receiver according to  claim 1 , wherein the multiple frequency division ratios are selected from a set that comprises multiple integral frequency division ratios and multiple fractional frequency division ratios. 
     
     
       3. The radio frequency receiver according to  claim 1 , wherein the processing circuit comprises multiple processing units, and each of the multiple processing units is associated with one of the output ends of the band splitter in a one-to-one manner, and any of the multiple processing units comprises:
 a bandpass filter, configured to receive one band signal in the at least one band signal output by the band splitter, and filter out a signal outside a band of the band signal to obtain a signal within one band; and   a radio frequency amplifier, coupled to the bandpass filter and configured to receive the signal within the band and perform gain amplification on the signal within the band to obtain a processed signal.   
     
     
       4. The radio frequency receiver according to  claim 3 , wherein the radio frequency receiver further comprises: a switching unit, wherein the switching unit is coupled between the multiple processing units and the multiple receiving channels, and the switching unit is configured to exercise switching control, to enable the any receiving channel to be selectively coupled to a processing unit in the processing circuit to receive the processed signal. 
     
     
       5. The radio frequency receiver according to  claim 1 , wherein the any receiving channel comprises:
 a configurable frequency divider, configured to:
 receive a control signal; 
 selectively select, under control of the control signal, the frequency division ratio of the any receiving channel from the multiple frequency division ratios; and 
 perform, based on the frequency division ratio of the any receiving channel, frequency division on the oscillation signal received by the any receiving channel to obtain the local oscillator signal; 
 a frequency mixer, configured to use the local oscillator signal to perform frequency mixing on the received processed signal to obtain the mixed signal; 
 a lowpass filter, configured to perform noise suppression on the mixed signal; and 
 a baseband amplifier, configured to amplify the mixed signal obtained after noise suppression, so as to generate the baseband signal corresponding to associated with the target carrier. 
   
     
     
       6. The radio frequency receiver according to  claim 5 , wherein: the configurable frequency divider comprises a frequency divider, and the frequency divider comprises multiple frequency division modes, wherein each of the frequency division modes is associated with an integral frequency division ratio or a fractional frequency division ratio; and
 the frequency divider is configured to configure, under control of the control signal, one frequency division mode of the multiple frequency division modes as a current working mode, so as to implement selective selection of the frequency division ratio of the any receiving channel from the multiple frequency division ratios.   
     
     
       7. The radio frequency receiver according to  claim 5 , wherein the configurable frequency divider comprises multiple frequency dividing units and a selector, wherein:
 each of the frequency dividing units is associated with an integral frequency division ratio or a fractional frequency division ratio;   one end of the multiple frequency dividing units is separately coupled to an input end of the configurable frequency divider, and the other end of the multiple frequency dividing unit is separately coupled to an input end of the selector;   an output end of the selector is coupled to an output end of the configurable frequency divider, and the selector is configured to: receive the control signal; select, under control of the control signal, one frequency dividing unit of the multiple frequency dividing units; and turn on the frequency dividing unit, so as to implement selective selection of the frequency division ratio of the any receiving channel from the multiple frequency division ratios.   
     
     
       8. The radio frequency receiver according to  claim 5 , wherein the radio frequency receiver further comprises a control signal generator, configured to generate a control signal required by the configurable frequency divider in the any receiving channel. 
     
     
       9. The radio frequency receiver according to  claim 1 , wherein the radio frequency receiver further comprises a baseband processor, configured to perform baseband processing on baseband signals output by the multiple receiving channels. 
     
     
       10. The radio frequency receiver according to  claim 1 , wherein the any receiving channel is a zero-intermediate-frequency receiving channel. 
     
     
       11. The radio frequency receiver according to  claim 1 , wherein the multiple frequency synthesizers and the multiple receiving channels are integrated in an integrated circuit. 
     
     
       12. A receiving method comprising:
 performing band splitting on a radio frequency signal to obtain at least one band signal, and outputting the at least one band signal, wherein the radio frequency signal is a carrier aggregated signal of multiple carriers, and each of the band signals comprises at least one carrier of the multiple carriers; 
 separately performing filtering and amplification processing on the at least one band signal to obtain at least one processed signal; 
 generating multiple oscillation signals; 
 selectively receiving a processed signal, of the at least one processed signal, that comprises a target carrier; 
 receiving an oscillation signal, of the multiple oscillation signals, associated with the target carrier; 
 selectively selecting a frequency division ratio from multiple frequency division ratios; 
 using the frequency division ratio to perform frequency division on the received oscillation signal to obtain a local oscillator signal; 
 using the local oscillator signal to perform frequency mixing on the received processed signal that comprises the target carrier to obtain a mixed signal; and 
 generating, based on the mixed signal, a baseband signal associated with the target carrier, wherein the target carrier is one of the multiple carriers comprised in the radio frequency signal, and mutual interference between the multiple oscillation signals is suppressed by separately selecting a frequency division ratio to perform frequency division on the multiple oscillation signals, 
 wherein, by separately selecting a frequency division ratio, a mutual pulling effect between the received oscillation signal and another oscillation signal, in the multiple oscillation signals, is suppressed, and no superimposition occurs between the target carrier and a signal obtained after performing frequency division on a spurious component of another oscillation signal. 
 
     
     
       13. The method according to  claim 12 , wherein the multiple frequency division ratios are selected from a set that comprises multiple integral frequency division ratios and multiple fractional frequency division ratios. 
     
     
       14. The method according to  claim 12 , wherein the separately performing filtering and amplification processing on the at least one band signal to obtain the at least one processed signal comprises:
 receiving a band signal in the at least one band signal; 
 filtering out a signal outside a band of the band signal to obtain a signal within one band; and 
 performing gain amplification on the signal within the one band to obtain the at least one processed signal. 
 
     
     
       15. The method according to  claim 14 , wherein the selectively receiving the processed signal, of the at least one processed signal, that comprises the target carrier comprises:
 exercising switching control, so as to implement selective reception of the processed signal, of the at least one processed signal, that comprises the target carrier. 
 
     
     
       16. The method according to  claim 12 , wherein the selectively selecting the frequency division ratio from multiple frequency division ratios, and using the frequency division ratio to perform frequency division on the received oscillation signal to obtain the local oscillator signal comprises:
 receiving a control signal, and selectively selecting, under control of the control signal, the frequency division ratio from the multiple frequency division ratios; and 
 performing, based on the frequency division ratio, frequency division on the received oscillation signal to obtain the local oscillator signal. 
 
     
     
       17. A receiver comprising:
 a first amplifier configured to amplify a first radio frequency (RF) input signal, and provide a first RF output signal, wherein the first RF input signal includes at least a first carrier of a RF carrier aggregation signal;   a second amplifier configured to amplify a second RF input signal, and provide a second RF output signal, wherein the second RF input signal includes at least a second carrier of the RF carrier aggregation signal;   a switcher configured to switch at least one of the first RF output signal and the second RF output signal to be coupled to a first mixer or a second mixer according to the RF carrier aggregation signal, which is obtained in a manner of intra-band continuous carrier aggregation (CA), intra-band non-continuous CA or inter-band non-continuous CA;   the first mixer configured to use a first local oscillator (LO) signal that is based on a first voltage controlled oscillator (VCO) to perform frequency mixing to obtain a first mixed signal;   the second mixer configured to use a second LO signal that is based on a second VCO to perform frequency mixing to obtain a second mixed signal;   the first mixer, the second mixer, the first VCO and the second VCO are integrated in one integrated circuit; and   a first configurable frequency divider comprising at least two first frequency dividers and configured to provide different division ratios by combining one or more of the first frequency dividers, wherein the first configurable frequency divider is for performing frequency division on an oscillation signal of the first VCO to obtain the first LO signal.    
     
     
       18. The receiver according to claim 17, wherein the first frequency configurable frequency divider further comprises:
 a first selector, wherein one end of each of the at least two first frequency dividers is separately coupled to an input end of the first configurable frequency divider, the other end of each of the at least two first frequency dividers is separately coupled to an input end of the first selector, and an output end of the first selector is coupled to an output end of the first configurable frequency divider.    
     
     
       19. The receiver according to claim 18, wherein the first selector is a multiplexer (MUX) configured to select, under control of a control signal (CTRL), one frequency divider of the at least two first frequency dividers, and turn on the one frequency divider.  
     
     
       20. The receiver according to claim 17, further comprising:
 a second configurable frequency divider comprises at least two second frequency dividers and configured to provide different division ratios by combining one or more of the second frequency dividers, wherein the second configurable frequency divider is for performing frequency division on an oscillation signal of the second VCO to obtain the second LO signal.    
     
     
       21. The receiver according to claim 20, wherein the second configurable frequency divider further comprises:
 a second selector, wherein one end of each of the at least two second frequency dividers is separately coupled to an input end of the second configurable frequency divider, the other end of each of the at least two second frequency dividers is separately coupled to an input end of the second selector, an output end of the second selector is coupled to an output end of the second configurable frequency divider.    
     
     
       22. The receiver according to claim 21, wherein the second selector is a multiplexer (MUX) configured to select, under control of a control signal (CTRL), one frequency divider of the at least two second frequency dividers, and turn on the one frequency divider.  
     
     
       23. The receiver according to claim 17, wherein the RF carrier aggregation signal is received by an antenna and passed through a diplexer.  
     
     
       24. The receiver according to claim 17, wherein the RF carrier aggregation signal is received by an antenna and passed through a triplexer.  
     
     
       25. A terminal comprising:
 a baseband processor and a receiver coupled to the baseband processor; wherein the receiver comprises:   a first amplifier configured to amplify a first radio frequency (RF) input signal, and provide a first RF output signal, wherein the first RF input signal includes at least a first carrier of a RF carrier aggregation signal;   a second amplifier configured to amplify a second RF input signal, and provide a second RF output signal, wherein the second RF input signal includes at least a second carrier of the RF carrier aggregation signal;   a switcher configured to switch at least one of the first RF output signal and the second RF output signal to be coupled to a first mixer or a second mixer according to the RF carrier aggregation signal, which is obtained in a manner of intra-band continuous carrier aggregation (CA), intra-band non-continuous CA or inter-band non-continuous CA;   the first mixer configured to use a first local oscillator (LO) signal that is based on a first voltage controlled oscillator (VCO) to perform frequency mixing to obtain a first mixed signal;   the second mixer configured to use a second LO signal that is based on a second VCO to perform frequency mixing to obtain a second mixed signal;   the first mixer, the second mixer, the first VCO and the second VCO are integrated in one integrated circuit; and   a first configurable frequency divider comprising at least two first frequency dividers and configured to provide different division ratios by combining one or more of the first frequency dividers, wherein the first configurable frequency divider is for performing frequency division on an oscillation signal of the first VCO to obtain the first LO signal.    
     
     
       26. The terminal according to claim 25, wherein the first configurable frequency divider further comprises:
 a first selector configured to select, under control of a control signal (CTRL), one frequency divider of the at least two first frequency dividers to provide a division ratio.    
     
     
       27. The terminal according to claim 25, further comprising:
 a second configurable frequency divider comprising at least two second frequency dividers and configured to provide different division ratios by combining one or more of the second frequency dividers, wherein the second configurable frequency divider is for performing frequency division on an oscillation signal of the second VCO to obtain the second LO signal.    
     
     
       28. The terminal according to claim 27, wherein the second configurable frequency divider further comprises:
 a second selector configured to select, under control of a control signal (CTRL), one frequency divider of the at least two second frequency dividers to provide a division ratio.