公开(公告)号：US20240333371A1

公开(公告)日：2024-10-03

申请号：US18325474

申请日：2023-05-30

Applicant: Silicon Laboratories Inc.

Inventor： Sriram Mudulodu

IPC: H04B7/08

CPC classification number: H04B7/082

Abstract: In one example, an apparatus includes: an analog front end (RF) circuit to receive and process, from a first antenna and a second antenna, a radio frequency (RF) signal to obtain a digital signal, the RF circuit having a single RF signal processing path; a baseband circuit coupled to the RF circuit to process the digital signal, the baseband circuit to determine a first metric for a first packet of the RF signal received via the first antenna; and an antenna selection controller coupled to the baseband circuit, the antenna selection controller to cause the RF circuit to switch from receipt of the RF signal via the second antenna to receipt of the RF signal via the first antenna based at least in part on the first metric.

公开(公告)号：US11632733B2

公开(公告)日：2023-04-18

申请号：US17472935

申请日：2021-09-13

Applicant: Silicon Laboratories Inc.

Inventor： Sriram Mudulodu ,  Manoj Kumar Medam

IPC: H04L27/28 ,  H04W56/00

Abstract: In one aspect, a radio device comprises: an analog front end (AFE) circuit to receive and process an incoming radio frequency (RF) signal comprising a packet; an analog-to-digital converter (ADC) coupled to the AFE circuit to receive and digitize the processed incoming RF signal into a digital signal; a detector coupled to the ADC to detect a carrier frequency offset (CFO) in the digital signal based at least in part on a preamble of the packet; and a controller coupled to the detector. The controller may generate a compensation value for the CFO based on the detected CFO and cause one or more components of the radio device to compensate for the CFO using the compensation value.

公开(公告)号：US20230077766A1

公开(公告)日：2023-03-16

申请号：US17472935

申请日：2021-09-13

Applicant: Silicon Laboratories Inc.

Inventor： Sriram Mudulodu ,  Manoj Kumar Medam

IPC: H04W56/00

Abstract: In one aspect, a radio device comprises: an analog front end (AFE) circuit to receive and process an incoming radio frequency (RF) signal comprising a packet; an analog-to-digital converter (ADC) coupled to the AFE circuit to receive and digitize the processed incoming RF signal into a digital signal; a detector coupled to the ADC to detect a carrier frequency offset (CFO) in the digital signal based at least in part on a preamble of the packet; and a controller coupled to the detector. The controller may generate a compensation value for the CFO based on the detected CFO and cause one or more components of the radio device to compensate for the CFO using the compensation value.

公开(公告)号：US10911419B2

公开(公告)日：2021-02-02

申请号：US15943542

申请日：2018-04-02

Applicant: Silicon Laboratories Inc.

Inventor： Sriram Mudulodu ,  Venkat Mattela

IPC: H04L29/06 ,  H04L12/801 ,  H04L12/733 ,  H04L12/46

Abstract: An apparatus and method for encrypting messages from a first node splits the message into a plurality of message units, each of which is encrypted. The encrypted message units are split into path units, each of which is directed to a different route path to a destination node. At the destination node, the path units are received and reassembled into encrypted message units, which are decrypted into message fragments and concatenated to form a message corresponding to the original one sent.

公开(公告)号：US20230189316A1

公开(公告)日：2023-06-15

申请号：US17547396

申请日：2021-12-10

Applicant: Silicon Laboratories Inc.

Inventor： Sriram Mudulodu ,  Manoj Kumar Medam ,  Rambabu Katla ,  Anil Kumar Adavally ,  Aravinth Kumar Ayyappannair Radhadevi

IPC: H04W72/08

CPC classification number: H04W72/085

Abstract: In one embodiment, an apparatus includes: a compensation circuit to select one of a plurality of compensation sets based on an allocated resource unit (RU) and compensate a digital complex signal using the selected compensation set; a digital-to-analog converter to convert the compensated digital complex signal to a compensated analog complex signal; a mixer coupled to the digital-to-analog converter to upconvert the compensated analog complex signal to a radio frequency (RF) signal; and a power amplifier coupled to the mixer to amplify the RF signal.

公开(公告)号：US11632140B2

公开(公告)日：2023-04-18

申请号：US17395869

申请日：2021-08-06

Applicant: Silicon Laboratories Inc.

Inventor： Sriram Mudulodu

IPC: H04B1/16 ,  H04L5/00 ,  H03L7/07 ,  G06F1/08 ,  H04B1/10

Abstract: A receiver for OFDM subcarriers has a first mode and a second mode. In the first mode, a tunable system clock is output at a nominal frequency, and in the second mode, the tunable system clock is offset so that a harmonic of the tunable system clock coincides with a particular OFDM subcarrier. The tunable system clock is coupled to a programmable modem PLL clock generator which generates clocks for an A/D converter coupled to a baseband processor which is also coupled to the programmable modem PLL clock generator. The programmable modem PLL clock generator is programmed to maintain a constant output frequency of each output in the first mode and the second mode.

公开(公告)号：US11611425B2

公开(公告)日：2023-03-21

申请号：US17586776

申请日：2022-01-27

Applicant: Silicon Laboratories Inc.

Inventor： Sriram Mudulodu

IPC: H04L7/00 ,  H04B1/12 ,  H03M1/12

Abstract: A Bluetooth receiver has an RF front end which has a gain control input, the RF front end converting wireless packets into a baseband signal which is coupled to the input of an analog to digital converter (ADC). A clock generator provides a clock coupled to the ADC, and an AGC processor performs an AGC process to provide a gain which places the baseband symbols in a range that is less than 90% of the input dynamic range of the ADC. When in a connected state, the clock generator provides a clock which is slower than is required to complete the AGC process during a preamble interval, and the AGC process uses a few initial bits of the address field. The remaining bits of the address field is compared with the corresponding address bits of the receiver to determine whether to receive the packet.

公开(公告)号：US10893477B2

公开(公告)日：2021-01-12

申请号：US16012766

申请日：2018-06-20

Applicant: Silicon Laboratories Inc.

Inventor： Logeshwaran Vijayan ,  Sriram Mudulodu

IPC: H04W52/02 ,  H04L27/26 ,  H04B17/318 ,  H04W84/12

Abstract: A power saving receiver has a controller which is operative to remove power from the receiver when a threshold is exceeded during reception of a packet. The threshold level is formed by comparison of any of: signal energy of unoccupied subcarriers less the signal energy in occupied subcarriers; signal energy in a first range of occupied subcarriers compared to signal energy in a different range of occupied subcarriers; error vector magnitude from a first set of subcarriers to a second set of subcarriers in a different spectral region of the channel; cyclic prefix cross-correlation, or common phase error increase.

公开(公告)号：US10708780B2

公开(公告)日：2020-07-07

申请号：US15883092

申请日：2018-01-29

Applicant: Silicon Laboratories Inc.

Inventor： Sriram Mudulodu ,  Venkat Mattela

IPC: H04W4/00 ,  H04W12/06 ,  H04L9/32 ,  H04W12/04

Abstract: An Internet of Things (IoT) device has a public device identifier and a private device identifier, where the public device identifier is publicly available and the private device identifier is secret but kept in a secure device database as a tuple. A registration request containing encrypted credentials comprising at least a private identifier and optionally a public identifier is sent from the IoT device to an association server in communication with a device database having an association between IoT public identifier and a corresponding IoT private identifier. The association server which receives the registration request and encrypted credentials responds with a registration acknowledgement when the decrypted credentials match the tuple in the device database, or forwards the request to a registration server when it does not. The requesting IoT device receives an acknowledgement and is thereafter able to join the wireless network.