Mediatek Corporation

Yu-Hsien Chang

Ching-Chia Cheng

Ying-Che Hung

Yu-Ming Lai

Shih-Chieh Yen

Li-Chun Ko

Cheng-Yi Chang

Tsai-Yuan Hsu

Po-Chun Huang

Tsung-Ming Chen

Ying-You Lin

Wen-Ying Chien

Kuan-I Li

Shuo-Jen Hsu

Yu-Ming Wen

Wen-Hsien Chiu

Pi-An Wu

Wei-Kai Hong

Yi-Chu Chen

Pei-Wen Hung

Po-Hsun Wei

Kai-Hsiang Yang

Ping-Chen Lin

Tzu-Wen Sung

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.

Apparatus and methods for improved transmit power

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.

Multi-user downlink orthogonal frequency-division multiple access configuration method

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.

Method for mitigating interference in a communications apparatus and a communications apparatus utilizing the same

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.

Apparatus and method for calibrating characteristics of power amplifier in transmitter

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.

Wireless communication apparatus for performing beamforming under frequency hopping and associated wireless communication method

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Hsinchu, Taiwan

Yu-Hsien Chang