| Summary: | 碩士 === 國防大學中正理工學院 === 電子工程研究所 === 91 === Under the complicated environment of wireless communication, the technology of error control coding is employed in the digital communication systems in order to reduce noise and interference errors in datum transmission. For example, satellite communications and mobile communications, etc.
Complementary Code Keying (CCK) is used in IEEE 802.11b standard. There are some decoding algorithms applied to CCK. It concludes maximum-Likelihood algorithm、majority logic algorithm and trellis decoding .
Besides, in this paper we define the relationship between decomposition and combination for each quaternary symbol.
It means to decompose a quaternary symbol into two binary bits. After the operation of turbo code encoding employed, a corresponding CCK is then formed by using the proposed combination .Consequently, the demodulation of CCK has been performed before turbo code decoding. Finally, we use the some matrix and combination to obtain the original information.
We propose the decomposition and combination between the quaternary and binary symbols, which only employ two binary generator matrices.
The complexity of two binary generator matrices is much less than a quaternary generator matrix.
Therefore, it will drastically reduce the complexity in the decoding process.
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