Mediatek Corporation

National Taiwan University

Shao-Chou Hung

Chun-Chia Chen

Gilles Charbit

I-Kang Fu

Abdelkader Medles

Bao-Chi Peng

Kwang-Cheng Chen

Provided is an apparatus for transmitting a circularly polarized signal by linearly polarized antennas. A horizontally polarized antenna and a vertically polarized antenna of the apparatus receives a first circularly polarized signal transmitted based on a transmitted baseband signal vector. Based on the first circularly polarized signal, a radio frequency (RF) module of the apparatus generates a received baseband signal vector including a product of the transmitted baseband signal vector and a receiving polarization vector of the transmitted baseband signal vector. Processing circuitry of the apparatus estimates the receiving polarization vector based on the received baseband signal vector and calibrates power amplifiers (PAs) and local oscillator (LO) signals of frequency converters in the RF module based on the estimated receiving polarization vector. The horizontally and vertically polarized antennas transmit a second circularly polarized signal based on the calibrated PAs and the calibrated LO signals of the frequency converters.

Transmitting or receiving circularly polarized signals by linearly polarized antennas

Aspects of the disclosure provide an apparatus for receiving a circularly polarized signal by linearly polarized antennas. A horizontally polarized antenna and a vertically polarized antenna of the apparatus receive a circularly polarized signal that is transmitted based on a transmitted baseband signal vector. A radio frequency (RF) module of the apparatus generates a first baseband signal vector based on the received circularly polarized signal. The first baseband signal vector includes a product of the transmitted baseband signal vector and a receiving polarization vector of the transmitted baseband signal vector. Processing circuitry of the apparatus estimates the receiving polarization vector of the transmitted baseband signal vector based on the first baseband signal vector. The processing circuitry derives a second baseband signal vector based on the estimated receiving polarization vector and the first baseband signal vector.

The disclosure provides a method including the following steps: receiving, by an electronic device, beacon signals transmitted from access points, and estimating the number of the access points according to the beacon signals; determining by the electronic device whether the electronic device can connect to a base station; when it is determined that the electronic device cannot connect to the base station, estimating the number of connection access points according to the number of the access points and a first data queue by the electronic device; and when it is determined that the electronic device can connect to the base station, determining by the electronic device whether to connect the electronic device to the base station according to the first data queue, and estimating the number of the connection access points according to the number of the access points, the first data queue and a determination result.

Growing community of inventors

Taipei, Taiwan

Shao-Chou Hung