公开(公告)号：US20190227144A1

公开(公告)日：2019-07-25

申请号：US16168853

申请日：2018-10-24

Applicant: MEDIATEK INC.

Inventor： Tzu-Chin Lin ,  Chih-Ming Hung ,  Jui-Lin Hsu ,  Chao-Ching Hung ,  Bao-Chi Peng

IPC: G01S7/40 ,  H04B17/21 ,  G01S13/02 ,  G01S13/88

Abstract: A wireless system includes a local oscillator (LO) signal generation circuit, a receiver (RX) circuit, and a calibration circuit. The LO signal generation circuit generates an LO signal according to a reference clock. The LO signal generation circuit includes an active oscillator. The active oscillator generates the reference clock, wherein the active oscillator includes at least one active component, and does not include an electromechanical resonator. The RX circuit generates a down-converted RX signal by performing down-conversion upon an RX input signal according to the LO signal. The calibration circuit generates a frequency calibration control output according to a signal characteristic of the down-converted RX signal, and outputs the frequency calibration control output to the LO signal generation circuit. The LO signal generation circuit adjusts an LO frequency of the LO signal in response to the frequency calibration control output.

公开(公告)号：US09912499B2

公开(公告)日：2018-03-06

申请号：US15385436

申请日：2016-12-20

Applicant: MediaTek, Inc.

Inventor： Balachander Narasimhan ,  Charles Chien ,  Qiang Zhou ,  Chih-Yuan Lin ,  Cheng-Chou Zhan ,  Bao-Chi Peng

IPC: H04L25/03 ,  H04W4/00 ,  H04B5/00 ,  H04L1/20 ,  G06K19/07 ,  H04B1/00

CPC classification number: H04L25/03019 ,  G06K7/10118 ,  G06K7/10138 ,  G06K19/07 ,  G06K19/0723 ,  H04B1/00 ,  H04B5/0031 ,  H04B5/0037 ,  H04B5/0075 ,  H04L1/203 ,  H04W4/80

Abstract: An electronic device for a wireless communication system is described. The electronic device comprises: a receiver configured to receive a modulated signal on a communication channel; and a processor, coupled to the receiver and configured to: process the received modulated signal; identify a communication channel characteristic based on the processed received modulated signal; select an equalizer having a first set of equalization coefficients based on the identified communication channel characteristic, wherein the first set of equalization coefficients is selected from a plurality of equalization coefficients, each of the plurality of equalization coefficients being associated with different communication channel characteristics; equalize the processed received modulated signal on the communication channel using the selected equalizer; and detect the equalized received modulated signal.