適用於頻選式衰落通道環境之本質性多樣性分集助益之起始時頻同步系統 Initial Synchronization Assisted by Inherent Diversity over Time-Varying Frequency-Selective Fading Channels
在時變與頻率選擇衰變通道環境中利用本質上的分集進行初始同步的方法與裝置INITIAL SYNCHRONIZATION METHOD AND APPARATUS ASSISTED BY INHERENT DIVERSITY OVER TIME-VARYING FREQUENCY-SELECTIVE FADING CHANNELS
2015/04/28 (103053US) 2014/10/31 (103053TW)
9,419,785 美國 I559724 中華民國
The present invention relates to an initial synchronization apparatus assisted by inherent diversity over time-varying frequency-selective fading channels. Based on motivation from statistical derivations, the present invention provides a novel initial synchronization method for estimating timing error and carrier frequency offset (CFO) by embedding matched filters into RAKE fingers to approach modified CramerRao lower bounds (MCRLBs). In addition, the present invention is then built to approach modified CramerRao lower bounds by taking advantage of a maximum ratio combining (MRC) criterion. In practice, the proposed technique can significantly outperform a conventional initial synchronization technique on the timing error and CFO estimations over multipath fading channels.
An object of the present invention is to provide an initial synchronization method and apparatus assisted by inherent diversity over time-varying frequency-selective fading channels, wherein the more precise estimation of timing error and frequency offset is achieved based on the rake architecture.