發明
南韓
10-2008-0046548
10-0954495
多載波通訊系統之通道估計方法Method for OFDM and OFDMA channel estimation
國立交通大學
2010/04/15
一種多載波通訊系統之通道估計方法,其係在正交分頻多工(OFDM)及正交分頻多工存取(OFDMA)使用相位旋轉多項式插補之通道估計。在OFDM及OFDMA系統基於複雜度的考量,經常採取多項式插補演算法來做通道估計,其中以線性插補法為最簡便之插補法。然而多項式插補演算法之效能取決於符碼時間同步的精準度以及通道延滯擴散。本發明藉由一線性相位參數加至多項式插補器上,此一線性參數相當於在時域加入一時間延滯量(稱為延遲偏移),以求得較佳之相位旋轉多項式插補效能。 This invention discloses a method for OFDM and OFDMA channel estimation via phase-rotated polynomial interpolation and extrapolation. For complexity reason, polynomial inter/extra-polation is an often considered method for channel estimation in orthogonal frequency-division multiplexing (OFDM) and orthogonal frequency-division multiple access (OFDMA) systems, in which the simplest choice is linear inter/extra-polation. But the performance of the method depends on the accuracy of symbol timing estimation as well as the channel delay spread. The invention considers mitigating the problem by adding a linear phase factor to the polynomial inter/extra-polator, which corresponds to adding a delay (called delay shift) in the time domain.
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