Qualcomm Incorporated

United Microelectronics Corp.

Qualcomm Atheros Inc.

Justin Huang

Qinfang Sun

Hao-Ren Cheng

Li-Min Chang

William John McFarland

Paul J Husted

Wen-Chang Yeh

Gaspar Lee

Chih-Yuan Chu

Tong Liao

Chen-Wen Pao

Tony Liao

C W Pao

A spur detection and spur cancellation apparatus in a multiple sub-carrier digital communication receiver includes a spur detection block that estimates, using one or more Fourier transforms, a frequency location of a narrowband interference spur in a received digital signal that includes a plurality of sub-carriers, and a spur cancellation block that attenuates the estimated narrowband interference spur. The spur detection block may use a fast Fourier transform (FFT) and/or a discrete Fourier transform (DFT) to locate a frequency and to measure a discrete power spectra of the narrowband interference spur. A channel state information block in the receiver may adjust a channel state information metric based on the located frequency and/or the measured discrete power spectra of the narrowband interference spur.

System and method for spur estimation and mitigation

A receiver for receiving both GPS signals and GLONASS signals is provided. This receiver includes an analog front end (AFE), a GPS digital front end (DFE) and a GLONASS DFE for receiving an output of the AFE, and a dual mode interface (DMI) for receiving outputs of the GPS and GLONASS DFEs. Search engines are provided for receiving outputs of the DMI. Notably, certain front-end components of the AFE are configured to process both the GPS signals and the GLONASS signals.

Digital front end in system simultaneously receiving GPS and GLONASS signals

Scattered pilots are used to estimate the integer frequency offset and OFDM symbol index simultaneously. A cross-correlation between IFFT outputs of received samples with different spectral shift and OFDM symbol index is used to identify the channel impulse response. Upon determination of the channel impulse, the estimated integer frequency offset and OFDM symbol index can then be determined.

System and method for frequency offset and symbol index estimation

Automatic gain control in system simultaneously receiving GPS and GLONASS signals

A pad backer is described, comprising a backing plate, an elastomer layer and a pad backing ring. The elastomer layer has a bottom surface bonded to the backing plate and an upper surface with a protrudent part at the edge portion thereof. The pad backing ring has an inner bottom surface with a recessed part thereon matching with the protrudent part on the upper surface of the elastomer layer, such that the elastomer layer is fixed onto the pad backing ring through engagement of the protrudent part and the recessed part.

Pad backer and CMP process using the same

Pad backer

Growing community of inventors

Hsinchu, Taiwan

Justin Huang