| Summary: | 碩士 === 國立宜蘭大學 === 電子工程學系碩士班 === 94 === In recent years, more and more efforts are devoted to the study of wireless networks as they become pervasive. Research of wireless networks aims at achieving faster transmission and better network services. However, degradation due to channel fading and multipath effects can corrupt transmitted frames in a wireless network. To improve network performance, one of the approaches is to use forward error correction (FEC) schemes that allow the receiver to correct errors in the received packets by using Reed-Solomon or similar codes.
In this thesis, we analyze the performance of several Reed-Solomon codes applied to 802.11a wireless area network. The codes differ in their error correcting capability. In general, codes with higher error correcting ability also require more parity bytes. Quantitative analysis shows that in an adverse environment, it is beneficial to use a more powerful error correcting code. Based on the results, we propose a new method called “Adaptive FEC”. It adaptively selects error correcting scheme appropriate for the current environment. Through cross-layer information interchange, it can be implemented easily and leads to better performance in a wireless local area network.
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