Setting baseband gain for signals below noise

Patent metadata

Field	Value
Publication number	US-11736334-B2
Application number	US-202217702040-A
Country	US
Kind code	B2
Filing date	Mar 23, 2022
Priority date	Apr 15, 2021
Publication date	Aug 22, 2023
Grant date	Aug 22, 2023

Abstract

Methods and devices are disclosed that derive an IQ magnitude parameter, and then determine the optimum IQ magnitude for wanted signals with negative signal to noise values. For each device installation, a calibration routine may be carried out that sets the baseband gain to produce this optimum IQ magnitude for each frequency channel.

First claim

What is claimed is:

1. A method in a first wireless device (WD) for setting a receiver baseband gain for receiving wanted signals with negative signal to noise by a receiver of the WD, the method comprising:
for each channel of the WD, determining a setting of a receive baseband gain of the receiver that produces an IQ magnitude parameter having a predetermined value, the predetermined value being predetermined as a value that results from an applied receive baseband gain setting that produces a predetermined receiver sensitivity; and
for each channel of the WD, storing the determined receive baseband gain setting for subsequent application to signals received by the receiver.

2. The method of claim 1 , wherein the IQ magnitude parameter is a sum of squares of outputs of I and Q analog-to-digital converters (ADCs).

3. The method of claim 1 , wherein the predetermined value is determined as an IQ magnitude parameter value having a least variance.

4. The method of claim 3 , wherein the least variance value of the IQ magnitude parameter is calculated by:
reading an IQ magnitude value i times, and taking an average, A of the readings;
recording averages, A j , for J sets of readings of the IQ magnitude, {A 1 , A 2 , A 3 , . . . A J };
determining a median value, M k , of the averages, MEDIAN{A 1 , A 2 , A 3 , . . . A J };
recording the median values, Mt, for K sets of determinations of the median values, {M 1 , M 2 , M 3 , . . . M K };
determining a minimum median value, MIN {M 1 , M 2 , M 3 , . . . M K }; and
returning the minimum median value as the IQ magnitude parameter value having the least variance.

5. The method of claim 1 , wherein the predetermined value is determined based at least in part on determining a response to a plurality of test packets in a preoperational setting.

6. The method of claim 1 , wherein the receive baseband gain settings are determined when an antenna of the WD is receiving only noise.

7. The method of claim 1 , wherein a determined receive baseband gain setting corresponds to direct sequence spread spectrum signal receiver sensitivity.

8. The method of claim 1 , wherein a second determined receive baseband gain setting corresponds to orthogonal frequency division multiple (OFDM) receiver sensitivity.

9. A first wireless device (WD), comprising:
a wireless transmitter configured to transmit a ranging signal and a wireless receiver configured to receive a response signal from a second WD in response to the ranging signal; and
processing circuitry in communication with the wireless receiver and with the wireless transmitter, the processing circuitry configured to, for each channel of the first WD:
vary settings of a receive baseband gain of the wireless receiver and determine an IQ parameter value for each receive baseband gain setting; and
record a receive baseband gain setting that produces a predetermined IQ parameter value for the channel, the predetermined IQ parameter value being predetermined based on a determined sensitivity of the wireless receiver resulting from each of a plurality of receive baseband gain settings.

10. The WD of claim 9 , wherein the determined IQ parameter value is a sum of squares of outputs of I and Q analog-to-digital converters (ADCs).

11. The WD of claim 9 , wherein the predetermined IQ parameter value is determined as an IQ magnitude parameter value having a least variance.

12. The WD of claim 9 , wherein the predetermined IQ parameter value is determined based at least in part on a response to a plurality of test packets in a preoperational setting.

13. The WD of claim 9 , wherein the receive baseband gain settings are determined when an antenna of the WD is receiving only noise.

14. The WD of claim 9 , wherein the determined IQ parameter is based at least in part on an average value of IQ parameter values determined over time.

Assignees

• Sr Tech Inc

Inventors

• Fernandez Olivia
• Busser Ryan

Classifications

• H04L27/364 Primary

  Arrangements for overcoming imperfections in the modulator, e.g. quadrature error or unbalanced I and Q levels · CPC title

• H04B1/0032

  with analogue quadrature frequency conversion to and from the baseband (quadrature modulators and demodulators per se H03D3/007, H03C3/40) · CPC title

• H04B1/40 Primary

  Circuits · CPC title

• H04L5/0007

  the frequencies being orthogonal, e.g. OFDM(A) or DMT · CPC title