Current reduction by dynamic receiver adjustment in a communication device

Abstract

A method for reducing current drain in a communication device includes detecting ( 602, 604 ) interferers outside of a receiver passband of the communication device, measuring power levels and frequency offsets ( 608, 808 ) of the interferers and a transmitter of the communication device, and determining ( 609, 809 ) whether crossmodulation products exceed a noise spectrum threshold within the receiver passband. If the crossmodulation products exceed the threshold, the method includes calculating ( 605, 805 ) a receiver linearity required to achieve a desired signal-to-interference ratio and adjusting the receiver linearity calculated in the calculating step to achieve the desired signal-to-interference ratio.

1 . A method for reducing current drain in a communication device, the method comprising the steps of: 
 detecting an interferer outside of a receiver passband of the communication device;    measuring power levels and frequency offsets of the interferer and a transmitter of the communication device;    determining whether crossmodulation products exceed a noise spectrum threshold within the receiver passband, whereupon, if the crossmodulation products exceed the noise spectrum threshold, 
 calculating a receiver linearity required to achieve a desired signal-to-interference ratio; and  
 adjusting the receiver linearity calculated in the calculating step to achieve the desired signal-to-interference ratio.  
   
   
   
       2 . A method as recited in  claim 1 , wherein the detecting and measuring steps includes estimating a signal spectrum of the interference products of the interferer and transmitter.  
   
   
       3 . A method as recited in  claim 1 , wherein the calculating step includes a normalization of the interference using an attenuation factor of the receiver at the frequency offset.  
   
   
       4 . A method as recited in  claim 1 , wherein the adjusting step includes adjusting a dynamic range of the receive in accordance with the adjusted receiver linearity.  
   
   
       5 . A method as recited in  claim 1 , wherein the calculating step includes calculating a third-order intercept point threshold to provide sufficient signal-to-interference, and wherein the adjusting step includes setting at least one of the group of current and gain to the receiver at a level sufficient to at least meet the third-order intercept point threshold.