| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所 === 98 === Usually, data frames encapsulated in the medium access control MAC layer are
protected by the well-known CRC-32 mechanism. The CRC-32 redundant information is
produced by encoding the original data according to a pre-specified polynomial function.
Upon the receiver receiving the data frame, it calculates the CRC-32 remainder of the
received frame for determining whether the received data frame is correct or not. If the
checking fails, the automatic repeat request (ARQ) protocol of MAC layer will be triggered to
retransmit the erroneous data frame from transmitter to receiver. ARQ protocol is designed to
achieve reliable transmissions over unreliable channel, and thus the packet loss probability is
decreased. However, there is an issue that one erroneous data bit in a data frame will cause
whole data frame to be retransmitted. This thesis proposes to properly store erroneous data
frame(s) and combine it with the newly retransmitted frame may find out the original data
frame. Based on our preliminary work [1], this thesis further utilizes the parallel architecture
to construct the CRC based packet error corrector, which has the features of low circuit
complexity and short processing time, as compared to the previously developed serial CRC
based packet error corrector (CEC).
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