Method and apparatus to improve received signal strength indicator measurement at a receiver
AssigneeSilicon Laboratories Inc.
InventorsSriram Mudulodu, Manoj Kumar Medam
Life of this patent
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Abstract
In one embodiment, a receiver includes: an analog front end (AFE) circuit to receive and process an incoming radio frequency (RF) analog signal comprising a packet; an analog-to-digital converter (ADC) coupled to the AFE circuit to receive and digitize an analog signal based on the RF analog signal into a digital signal; a packet detector coupled to the ADC to detect the packet based on the digital signal; and a computation circuit coupled to the packet detector. The computation circuit may be configured to determine a received signal strength indicator (RSSI) value based at least in part on a portion of a preamble of the packet.
Claims7
A method comprising:
- detecting, in a receiver, a packet having a plurality of orthogonal frequency division multiplexing (OFDM) symbols;
- calculating, in a first computation circuit of the receiver, a received signal strength indicator (RSSI) value for at least one of the plurality of OFDM symbols;
- and
- filtering the RSSI value if the packet is not intended for the receiver and processing the RSSI value if the packet is intended for the receiver, comprising determining an average RSSI value, comprising determining an intra-frame RSSI value comprising an average of a plurality of RSSI values for at least some of the plurality of OFDM symbols of the packet, comprising weighting more recent RSSI values with a higher weighting than one or more earlier RSSI values when determining the intra-frame RSSI value.
A system comprising:
- an analog front end (AFE) circuit to receive and downconvert an incoming radio frequency (RF) signal comprising a packet into a second frequency signal;
- a digitizer coupled to the AFE circuit to receive and digitize the second frequency signal into a digital signal;
- a computation circuit coupled to the digitizer, the computation circuit to calculate a plurality of received signal strength indicator (RSSI) values based on one or more of a preamble field, a signal field, or a data field of the packet;
- a processing circuit coupled to the computation circuit, the processing circuit to determine an RSSI metric based on the plurality of RSSI values, the RSSI metric comprising an intra-frame average RSSI value based on the plurality of RSSI values, and averaged in a coherent manner;
- and
- a controller coupled to the processing circuit, wherein the controller is to adapt a communication rate between the system and a station based at least in part on the RSSI metric.
Dependencies are inferred from the claim text.