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US 2004/0002300 A1Published application
Blind modulation cancellation by addition of modulated signal
AssigneeQUALCOMM Incorporated
InventorGary John Ballantyne
Life of this patent
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AssigneeQUALCOMM Incorporated
InventorGary John Ballantyne
Estimating the term…
A signal processing method, applied in a wireless communications module having a receive path, prevents a nonlinear device in the receive path from using an amplitude modulated transmit or other bleed-over signal in the receive path to modulate a non-amplitude modulated jammer signal on the receive path (or to further modulate an already amplitude modulated jammer signal). The bleed-over signal is conditioned by adding one or more amplitude modulated dummy signal(s) having an envelope that complements an envelope of the bleed-over signal, forcing the nonlinear circuit to operate linearly with respect to the jammer signal. Output of the amplifier may be filtered to remove signals having bandwidths of the dummy signal(s), bleed-over signal, jammer signal, and any intermodulation products generated by introducing the dummy signal(s).
A method of canceling cross-modulation in a wireless communications module including a receive path, comprising operations of:
A signal processing method performed in a wireless communications module that includes a receive path including a nonlinear device, the signal processing method preventing an amplitude modulated bleed-over signal on the receive path from modulating a jammer signal on the receive path during processing of the bleed-over and jammer signals by the nonlinear device, the method comprising operations of:
An apparatus comprising circuitry of multiple interconnected electrically conductive elements configured to perform operations to cancel cross-modulation in a wireless communications module having a receive path receiving a source signal including an amplitude modulated bleed-over signal, a jammer signal, and a receive signal having a receive frequency bandwidth, the operations comprising:
An apparatus comprising circuitry of multiple interconnected electrically conductive elements configured to perform signal processing operations in a wireless communications module that includes a receive path including a nonlinear device, the signal processing method preventing an amplitude modulated bleed-over signal on the receive path from modulating a jammer signal on the receive path during processing of the bleed-over and jammer signals by the nonlinear device, the operations comprising:
Receive path circuitry for a wireless communications apparatus, comprising:
Receive path circuitry for a wireless communications apparatus, comprising:
Dependencies are inferred from the claim text.