SYSTEMS AND METHODS FOR ACTIVE INTERFERENCE CANCELLATION TO IMPROVE COEXISTENCE
First Claim
1. A method for providing active interference cancellation between a Bluetooth transmit chain and a wireless local area network (WLAN) receive chain, comprising sampling a signal from the Bluetooth transmit chain, generating a plurality of quadrature components of the sampled signal with a polyphase filter quadrature radio-frequency (RF) phase shifter, and adjusting a phase of the sampled signal by weighting and combining the plurality of quadrature components to create an output signal.
1 Assignment
0 Petitions
Accused Products
Abstract
This disclosure describes techniques for providing active interference cancellation in a wireless communication system having a Bluetooth transmit chain and a WLAN receive chain. A signal sampled from the Bluetooth transmit chain is gain and phase adjusted to offset interference in the WLAN receive chain. A quadrature phase shifter may be used to generate quadrature components of the sampled signal that are selectively combined to achieve a desired phase adjustment. The phase shifter may be stabilized by a variable capacitor. These techniques may be extended to MIMO systems.
-
Citations
22 Claims
- 1. A method for providing active interference cancellation between a Bluetooth transmit chain and a wireless local area network (WLAN) receive chain, comprising sampling a signal from the Bluetooth transmit chain, generating a plurality of quadrature components of the sampled signal with a polyphase filter quadrature radio-frequency (RF) phase shifter, and adjusting a phase of the sampled signal by weighting and combining the plurality of quadrature components to create an output signal.
- 11. A device for wireless communication comprising a Bluetooth transmit chain, a wireless local area network (WLAN) receive chain, and an active interference cancellation module coupled to the Bluetooth transmit chain and the WLAN receive chain, wherein the active interference cancellation module includes a sampler configured to sample a signal from the Bluetooth transmit chain, a polyphase filter quadrature radio-frequency (RF) phase shifter configured to generate a plurality of quadrature components of the sampled signal, and combination logic configured to adjust a phase of the sampled signal by weighting and combining the plurality of quadrature components to create an output signal.
Specification