Mediatek Corporation

Hfi Innovation Inc.

Hsiao-Lan Chiang

Pei-Kai Liao

Xiangyang Zhuang

Chien-Chang Li

Po-Yuen Cheng

Shang-Ho Tsai

Hsuan-Yu Liu

A method of small cell discovery and RSRP/RSRQ measurements in OFDM/OFDMA systems is proposed. A discovery reference signal (DRS) with low transmission frequency is introduced to support small cell detection within a short time, multiple small cell discovery, and accurate measurement of multiple small cells. The DRS consists of one or multiple reference signal types with the functionalities including timing and frequency synchronization, cell detection, RSRP/RSSI/RSRQ measurements, and interference mitigation. RE muting is configured for the DRS to reduce interference level from data to DRS for discovery and RSRP/RSRQ measurements for small cells.

Methods of discovery and measurements for small cells in OFDM/OFDMA systems

A method for estimating a phase error existing in a receiver of a MIMO OFDM communications system is disclosed. The method includes executing Hermitian transpose on channel coefficient matrix of the MIMO OFDM communications system for generating Hermitian-transposed channel coefficient matrix, multiplying received signal matrix of the receiver with the Hermitian-transposed channel coefficient matrix for generating converted signals, summing products of the converted signals and complex conjugates of pilot signals corresponding to the converted signals for generating a sum result, and generating the phase error according to the sum result, the converted signals, and the complex conjugates of the pilot signals. The pilot signals are extracted from the received signal matrix.

Method for estimating phase error in MIMO OFDM communications system

Growing community of inventors

Miaoli County, Taiwan

Hsiao-Lan Chiang