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公开(公告)号：US20250096823A1
公开(公告)日：2025-03-20
申请号：US18814570
申请日：2024-08-25
Applicant: MEDIATEK INC.
Inventor： Yu-Hsien Chang , Osama Khalil Shanaa , Yan Shi
Abstract: A radio frequency (RF) front-end circuit has a multi-way switch, an output terminal, and a shunt circuit. The multi-way switch has an input end, a plurality of output ends, and a control end. The input end is coupled to an antenna for receiving a radio frequency signal from the antenna. The control end is used to couple the input end to one of the output ends according to a switch control signal. The shunt circuit is coupled between the multi-way switch and the output terminal to provide one of shunt paths according to the switch control signal. The shunt paths correspond to different amounts of rejection to the radio frequency signal.
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公开(公告)号：US20220014227A1
公开(公告)日：2022-01-13
申请号：US17353351
申请日：2021-06-21
Applicant: MediaTek Inc.
Inventor： Yu-Hsien Chang , Po-Chun Huang , Pi-An Wu , Wen-Hsien Chiu , Tzu-Wen Sung
Abstract: Disclosed herein are devices and methods to reduce unwanted CIMS emission in a wireless communication device, such that the transmit (TX) power level applied in a RU can be increased without exceeding a regulatory emission requirement. In some aspects, unwanted emission may be reduced by shifting or changing local oscillator (LO) frequencies during TX operation. Some embodiments are directed to a fast-locking PLL with adjustable bandwidth that can be controlled to increase the PLL bandwidth during the RX to TX transition to provide a fast locking to a new LO frequency. Some aspects are directed to configuring an LO frequency shift amount for different RUs when multiple RUs are allocated within a frequency band.
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公开(公告)号：US11502795B2
公开(公告)日：2022-11-15
申请号：US17013683
申请日：2020-09-07
Applicant: MEDIATEK INC.
Inventor： Yu-Hsien Chang , Ying-You Lin , Kuan-I Li , Ping-Chen Lin , Po-Hsun Wei , Cheng-Yi Chang
Abstract: A multi-user downlink orthogonal frequency-division multiple access (OFDMA) configuration method includes: assigning contiguous resource units (RUs) included in a channel to a plurality of stations, respectively; and assigning, by an access point (AP), one modulation and coding scheme (MCS) to each of the plurality of stations. Data rates of modulation and coding schemes that are assigned to first stations and associated with contiguous first RUs assigned to the first stations are monotonic, where the first stations are included in the plurality of stations.
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公开(公告)号：US20200244304A1
公开(公告)日：2020-07-30
申请号：US16735714
申请日：2020-01-07
Applicant: MEDIATEK INC.
Inventor： Yu-Hsien Chang , Ching-Chia Cheng , Shuo-Jen Hsu , Ying-Che Hung , Li-Chun Ko
Abstract: A wireless communication apparatus includes a channel estimation circuit, a beamforming control circuit, and a transmit (TX) circuit. The channel estimation circuit estimates a channel between the wireless communication apparatus and another wireless communication apparatus during at least one first time slot. The beamforming control circuit determines beamforming coefficients according to the estimated channel. The TX circuit applies the beamforming coefficients to transmission of an output data during at least one second time slot later than the at least one first time slot. During the at least one second time slot, the output data is transmitted to another wireless communication apparatus via multiple antennae. The wireless communication apparatus performs communications according to a normal frequency hopping sequence in compliance with a communication specification.
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公开(公告)号：US11324048B2
公开(公告)日：2022-05-03
申请号：US16904519
申请日：2020-06-17
Applicant: MEDIATEK INC.
Inventor： Yu-Ming Lai , Kai-Hsiang Yang , Wen-Ying Chien , Tsai-Yuan Hsu , Yu-Hsien Chang , Yu-Ming Wen , Ying-Che Hung , Pei-Wen Hung
IPC: H04W74/08 , H04B17/318 , H04B17/336 , H04W24/10
Abstract: A communications apparatus includes a plurality of communications circuits and a coexistence management circuit. Each communications circuit is configured to provide wireless communications services in compliance with a protocol. The coexistence management circuit is configured to manage radio activities of the communications circuits. In response to a detection result of at least two radio activities to occur in a subsequent packet time, the coexistence management circuit is configured to determine whether an interference signal related to said at least two radio activities falls in a predetermined frequency band, and when the interference signal falls in the predetermined frequency band, the coexistence management circuit is configured to adjust a transmission power or an execution time of one of said at least two radio activities.
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Patent Agency Ranking
公开(公告)号：US20210075569A1
公开(公告)日：2021-03-11
申请号：US17013683
申请日：2020-09-07
Applicant: MEDIATEK INC.
Inventor： Yu-Hsien Chang , Ying-You Lin , Kuan-I Li , Ping-Chen Lin , Po-Hsun Wei , Cheng-Yi Chang
Abstract: A multi-user downlink orthogonal frequency-division multiple access (OFDMA) configuration method includes: assigning contiguous resource units (RUs) included in a channel to a plurality of stations, respectively; and assigning, by an access point (AP), one modulation and coding scheme (MCS) to each of the plurality of stations. Data rates of modulation and coding schemes that are assigned to first stations and associated with contiguous first RUs assigned to the first stations are monotonic, where the first stations are included in the plurality of stations.
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7.发明公开公开(公告)号：US20240298305A1
公开(公告)日：2024-09-05
申请号：US18592546
申请日：2024-03-01
Applicant: MEDIATEK INC.
Inventor： You-Wei Chen , Jianhan Liu , Shuling Feng , Yongho Seok , Yu-Hsien Chang , Thomas Edward Pare Jr.
IPC: H04W72/0453 , H04L5/00 , H04W84/12
CPC classification number: H04W72/0453 , H04L5/0007 , H04W84/12
Abstract: A Wi-Fi communication method includes: performing resource allocation for multi-user transmission orthogonal frequency division multiple access (OFDMA) according to a regulated frequency band boundary and a resource unit (RU) type, and sending information indicative of the resource allocation, where the RU type includes at least one of regular RU (rRU) and distributed-tone RU (dRU), the resource allocation indicates RUs or multiple RUs (MRUs) allocated in a channel, the channel is across the regulated frequency band boundary, and an RU or MRU allocated per user in the channel is not across the regulated frequency band boundary when using rRU.
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公开(公告)号：US11601156B2
公开(公告)日：2023-03-07
申请号：US17353351
申请日：2021-06-21
Applicant: MediaTek Inc.
Inventor： Yu-Hsien Chang , Po-Chun Huang , Pi-An Wu , Wen-Hsien Chiu , Tzu-Wen Sung
Abstract: Disclosed herein are devices and methods to reduce unwanted CIM3 emission in a wireless communication device, such that the transmit (TX) power level applied in a RU can be increased without exceeding a regulatory emission requirement. In some aspects, unwanted emission may be reduced by shifting or changing local oscillator (LO) frequencies during TX operation. Some embodiments are directed to a fast-locking PLL with adjustable bandwidth that can be controlled to increase the PLL bandwidth during the RX to TX transition to provide a fast locking to a new LO frequency. Some aspects are directed to configuring an LO frequency shift amount for different RUs when multiple RUs are allocated within a frequency band.
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公开(公告)号：US11228281B2
公开(公告)日：2022-01-18
申请号：US16439713
申请日：2019-06-13
Applicant: MEDIATEK INC.
Inventor： Yu-Hsien Chang , Yu-Ming Lai , Ching-Chia Cheng , Wei-Kai Hong , Yi-Chu Chen , Tsung-Ming Chen , Shih-Chieh Yen
Abstract: A calibration apparatus is used for calibrating characteristics of a power amplifier (PA) in a transmitter. The calibration apparatus includes an adaptive bias generator circuit that is used to track an envelope of an input signal received by control terminals of transistors of the PA and generate an adaptive bias voltage to the control terminals of the input transistors in response to the envelope of the input signal.
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公开(公告)号：US11108431B2
公开(公告)日：2021-08-31
申请号：US16735714
申请日：2020-01-07
Applicant: MEDIATEK INC.
Inventor： Yu-Hsien Chang , Ching-Chia Cheng , Shuo-Jen Hsu , Ying-Che Hung , Li-Chun Ko
Abstract: A wireless communication apparatus includes a channel estimation circuit, a beamforming control circuit, and a transmit (TX) circuit. The channel estimation circuit estimates a channel between the wireless communication apparatus and another wireless communication apparatus during at least one first time slot. The beamforming control circuit determines beamforming coefficients according to the estimated channel. The TX circuit applies the beamforming coefficients to transmission of an output data during at least one second time slot later than the at least one first time slot. During the at least one second time slot, the output data is transmitted to another wireless communication apparatus via multiple antennae. The wireless communication apparatus performs communications according to a normal frequency hopping sequence in compliance with a communication specification.
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