Time-frequency synchronization method allowing offsets

2015 Fiscal Year Final Research Report

• Project/Area Number: 25820162
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Communication/Network engineering
• Research Institution: Kyushu University
• Principal Investigator: Jitsumatsu Yutaka 九州大学, システム情報科学研究科(研究院, 准教授 (60336063)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 通信方式 / スペクトル拡散 / 測距 / レーダー / 物体検出

Outline of Final Research Achievements

Orthogonal Frequency Division Multiplexing (OFDM) systems are sensitive to frequency offset because subcarriers in OFDM system overlap each other in frequency domain. Gabor Division Spread Spectrum System (GD/S3) proposed by the leader of this research project et al. is robust to a frequency offset. In order to avoid a two-dimensional search for a time delay an a Doppler frequency shift of the channel, we propose a Phase Updating Loop (PUL) method that alternately uses a time-division (TD) code receiver for delay estimation and a frequency-division (FD) code receiver for Doppler estimation. As applications of PUL method, we propose a multiple-target detection radar system and a method for realizing higher order MPSK demodulator employing code-division technique in spread spectrum systems.

Free Research Field

無線通信，信号処理