Patent ID: 8559891
Filing Date: 2013-10-15
Classification: H04B,H04N,H04W

Abstract:
1. A double ADC receiver system for cognitive radio applications comprising: a first analog to digital converter adapted to convert an input signal to a first digital signal, wherein the input signal comprises a first specified set of channels; a first digital filtering element coupled with the first analog to digital converter and adapted to receive the first digital signal and to select one or more of the first specified set of channels, thereby forming a second specified set of channels, and, thereby forming a second digital signal; wherein the selection of each channel of the second specified set of channels is at least partially in response to a corresponding signal to noise ratio for each channel, wherein for each channel of the second specified set of channels, the corresponding signal to noise ratio exceeds a specified value, and, wherein the second digital signal comprises the second specified set of channels; a digital to analog converter coupled with the first digital filtering element and adapted to convert the second digital signal to a first analog signal; a summing node coupled with the digital to analog converter and adapted to combine the input signal and the first analog signal, thereby forming a second analog signal; a second analog to digital converter coupled with the summing node and adapted to convert the second analog signal to a third digital signal, wherein the third digital signal comprises a third specified set of channels and an undesirable energy corresponding to one or more specified channels of the second specified set of channels; and, a second digital filtering element coupled with the second analog to digital converter and adapted to receive the third digital signal and to at least partially remove the undesirable energy, thereby forming a fourth digital signal, wherein the fourth digital signal comprises a third specified set of channels.