| Summary: | 碩士 === 淡江大學 === 電機工程學系碩士班 === 98 === Most generation wireless communication systems are based on Orthogonal frequency-division multiplexing transmission technology. Besides the transmission technology changes, to avoid break down when users communicate by phone and support users in high speed environment are important. In a moving channel, doppler spread will cause inter carrier interference. It will affect performance seriously.
When the users far away form base station, the received signal will become weak. If we want to keep good quality of services, we can use adaptive modulation and coding technology to change the combination of modulation and coding.
In this paper, we will discuss the performance in different modulation, coding, and MIMO system in high speed environment and give an adaptive modulation and coding table in different speed and signal noise ratio.
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