Radio reciever with smart listening mode
AssigneeALi Corporation
InventorFabio Epifano
Life of this patent
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Abstract
The embodiments of the disclosure introduce a novel receiver having a smart listening mode for reducing the current consumption of a receiver while waiting for a data packet. In the smart listening mode, the receiver temporarily disables one signal path of a quadrature signal (e.g., I or Q path) until the receiver detects an arrival of data packet via a second signal path of the quadrature signal. The receiver continuously monitors the enabled signal path for the incoming data packet via in-channel energy. After the incoming data packet is detected, it is further determined whether the incoming data packet is a valid data packet. If not, one of the signal paths would be disabled again. As a result, the current consumption of the receiver is reduced while waiting for an incoming data packet.
Claims20
A receiver, receiving a radio frequency (RF) signal, comprising:
- a mixer, mixing the RF signal to generate a first signal and a second signal based on a local frequency, wherein the second signal has a phase shift of 90 degrees with respect to the first signal;
- a first path circuit, processing and transmitting the first signal;
- a second path circuit, processing and transmitting the second signal, wherein the second path circuit is configured to be disabled prior to a detection of an incoming data packet being carried by the RF signal on the first path circuit;
- and
- a data packet detection circuit, coupled to the first and second path circuits, continuously monitoring on the first path circuit for the incoming data packet via an in-channel energy detection, and outputting a control signal to enable the second path circuit based at least in part on an energy level detected on the first path circuit,
- wherein the data packet detection circuit further determines whether the incoming data packet carried by the first and second signals is a valid data packet by a signal correlation.
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A method for processing a radio frequency (RF) signal, adapted to a receiver, comprising:
- receiving the RF signal;
- converting the RF signal into a first signal and a second signal according to a local frequency, wherein the second signal has a phase shift of 90 degrees with respect to the first signal;
- conveying the first signal on a first signal path;
- disabling a second signal path coupled to the second signal prior to a detection of an incoming data packet being carried by the RF signal on the first signal path;
- continuously monitoring the first signal path for the incoming data packet by detecting an in-channel energy level on the first signal path;
- outputting a control signal to enable the second signal path to convey the second signal based at least in part on the in-channel energy level detected on the first signal path;
- and
- determining whether the incoming data packet carried by the first and second signals is a valid data packet via a signal correlation.
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A wireless communication apparatus, receiving a radio frequency (RF) signal, comprising:
- a signal processor;
- a down-converter, converting the RF signal into a first signal and a second signal based on a local frequency, wherein the second signal has a phase shift of 90 degrees with respect to the first signal;
- a first signal path, transmitting the first signal from the down-converter to the signal processor;
- a second signal path, transmitting the second signal from the down-converter to the signal processor, wherein the second signal path is disabled when no data packet is detected on the first or second signal paths;
- and
- a data packet detection circuit, coupled to the first and second signal paths, continuously monitoring the first signal path for an incoming data packet via an in-channel energy detection, outputting a control signal to enable the second signal path based at least in part on an in-channel energy level of the first signal on the first signal path,
- wherein the data packet detection circuit further determines whether the incoming data packet carried by the first and second signals is a valid data packet by a signal correlation.
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Dependencies are inferred from the claim text.