摘要
一種備有修改後的里德所羅門解碼器的方法與裝置，用來尋找被基地台使用的特定編碼群組，以及與該基地台同步的訊框。此修改後的里德所羅門解碼器使用了一個標準的里德所羅門解碼器和一些從收到的編碼符號算出的可靠度量測值。若收到的符號的可靠度太小，則此符號視為擦除。藉由選取較高可靠度的編碼符號，和擦除較低可靠度的編碼符號，符號錯誤的機率被降低，因此也改善了實施效果。本發明設計多種修改後的里德所羅門解碼器和一些解碼策略，以便以一低電力及記憶體需求小的方法，來將收到的編碼符號解碼。
A method and apparatus having a modified Reed-Solomon decoder is used for finding a specific code group used by a base station and the frame timing synchronization with the base station. The modified Reed-Solomon decoder uses a standard Reed-Solomon decoder and some reliability measurements computed from the received code word symbols. If the reliability of a received symbol is too low, this symbol is considered as erasure. By selecting code word symbols with higher reliabilities and erasing code word symbols with lower reliabilities, the symbol error probability is reduced and the performance is improved. Several modified Reed-Solomon decoders and a few decoding strategies are introduced in order to decode the received code word sequences with a power- and memory-effective method.