Second-Order Statistics of Diversity Combining Reception in Multipath Communication
碩士 === 國立中央大學 === 通訊工程研究所 === 96 === For wireless communication systems, diversity combining techniques are indispensable for reducing the multipath fading effects, and it is expected to enhance the system performance. However, diversity techniques are diminished over correlated channel branches, wh...
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| Format: | Others |
| Language: | en_US |
| Published: |
2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/gdw99n |
| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所 === 96 === For wireless communication systems, diversity combining techniques are indispensable for reducing the multipath fading effects, and it is expected to enhance the system performance. However, diversity techniques are diminished over correlated channel branches, which are commonly occurred in space diversity if the antennas are not separated at least coherence bandwidth. Second-order statistics are crucial performance criterion to evaluate the diversity effects of fading channels, whereas the performance in a correlated diversity system must be worse than that on independent multipath fading channels. A method which is to transform the correlated diversity branches into uncorrelated ones by the Karhunen-Loeve expansion, and then the transformed independent random variables are fed into the diversity combiner, and is expected to study the statistics of the fading channels.
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