USING THE BOUNDARY-MATCHING METHOD AT CHANNEL ESTIMATION FOR OFDM SYSTEMS
碩士 === 大同大學 === 通訊工程研究所 === 96 === There are many problems occurred in wireless communications destructing the signals transmitted. Fading is one of the main problems to affect the transmitting signals, hence the fading compensation is the most important problem to be soled especially in high-speed...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2008
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| Online Access: | http://ndltd.ncl.edu.tw/handle/65566944458813230077 |
| Summary: | 碩士 === 大同大學 === 通訊工程研究所 === 96 === There are many problems occurred in wireless communications destructing the signals transmitted. Fading is one of the main problems to affect the transmitting signals, hence the fading compensation is the most important problem to be soled especially in high-speed mobile communication.
Pilot symbol-assisted modulation is an effective scheme used to solve fading problems providing good effect to recover the destructed signals to the original ones. This modulation uses the pilots to estimate the fading effect and remove the estimated fading effect and then the signals will be recovered.
The boundary effect by discontinuously of the two ends of the points due to the period extend characteristic of the DFT could reduce the accuracy of the evaluation in pervious research. In this thesis, we discuss the Windowed method and Boundary Matched method to improve the traditional Discrete Fourier transform interpolation in channel estimation. By the simulating results, we can find these two methods can reduce the error of DFT interpolation, and improve the accuracy of channel estimation.
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