The paper will present the method for recovering the soft information in the
protocol stacks in type of WIFI and WIMAX, which is based on the joint
source-channel decoding (JSCD) techniques with enhanced permeable layer
mechanism used for wireless multimedia transmission. Packet header recovery at
varieties of protocol layers using MAP estimation is the cornerstone of the proposed
method. The inherently obtainable correlation of intro-layer and inter-layer header
proves to be effective in picking out a simplified set of header configurations for
further processing. The best candidate is then obtained using the soft decoding of
CRC or Checksum protected data and CRC or Checksum redundancy itself. Finally,
with a simulating program written by C++, we can prove that a multimedia
transmission system added an AWGN channel (Gaussian noise of zero mean and
variance s 2 ) using the method proposed in the paper can really obtain a significant
improvement of ENR at the receiver, and effective make the band of transmission
much wider and the quality of transmission much better.
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