| Patent application number | Description | Published |
|---|
| 20100026547 | METHOD AND APPARATUS FOR PROVIDING JAMMER DETECTION IN A RECEIVER - A method and apparatus for detecting a jammer comprising sampling an input signal; downconverting and sampling the input signal to generate a sampled downconverted (SD) input signal; comparing the sampled input signal to a wideband threshold TH | 02-04-2010 |
| 20100026549 | JAMMER DETECTION WITH MITIGATION OF DETECTION THRESHOLD HYSTERESIS PINCH-OFF EFFECT - Jammer detection is operable in both continuous and burst modes, managing a jammer attack in both cases. Whether in continuous or burst mode, jammer presence is detected according to a burst jammer environment. Results of jammer presence detection are stored to create a history of the jammer presence, and the history is used to manage the jammer attack. Jammer detector thresholds are implemented with hysteresis, and a hysteresis pinch-off characteristic is mitigated. | 02-04-2010 |
| 20110021168 | METHOD AND APPARATUS FOR RECEIVER WITH DUAL MODE AUTOMATIC GAIN CONTROL (AGC) - A method and apparatus for toggling between a first mode and a second mode of a receiver based on an input signal level comprising comparing a gain state of the receiver to at least one gain state thresholds; determining the presence of a jammer; and switching a current mode of the receiver to a new mode based on the presence of the jammer and the comparison of the gain state. In one aspect, the apparatus comprises two LNAs operating in different modes; a jammer detector to provide a jammer interrupt bit to indicate the presence of a jammer; and an automatic gain control (AGC) circuit coupled to the jammer detector for receiving the jammer interrupt bit, wherein the AGC circuit selects between the two LNAs based on the jammer interrupt bit and a gain state comparison. | 01-27-2011 |
| 20110090988 | APPARATUS AND METHODS FOR QAM MODULATION USING DUAL POLAR MODULATION - Apparatus and methods for QAM modulation are disclosed using dual polar modulation. QAM modulation of a signal is accomplished by translating a QAM signal into two phasors having the same or constant amplitude and then phase shifting one of the phasor by 180 degrees for a differential load. The phasors are then polar modulated such that, when differentially combined in the load through summation or superposition, a QAM modulated symbol results. The use of constant amplitude phasors when power amplified for transmission of QAM modulated signals allows amplifiers to be operated in a saturation mode with greater efficiency than conventional amplifiers used in QAM modulation, which operate in a less efficient linear mode to effect amplitude modulation. Additionally, differential combining of the phasors affords relaxation of the turns of a transformer used in amplifying the phasors. | 04-21-2011 |
