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The defense date of the thesis is 2008-08-18
The current date is 2019-05-24
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URN etd-0818108-122413 Statistics This thesis had been viewed 1902 times. Download 18 times. Author Huann-Chuan Hsieh Author's Email Address No Public. Department Communication Engineering Year 2007 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 71 Title Studies of Boundary Matching Oriented Pilot Allocation for Channel Estimation of OFDM Systems Keyword OFDM Boundary-Matching Pilot Allocation Channel Estimation Channel Estimation Pilot Allocation Boundary-Matching OFDM Abstract OFDM is a multi-carrier modulation technique and has a good performance in dealing with multi-path disturbance and Inter Symbol Interference (ISI).OFDM signals are easily distorted by fading channel and noise in wireless communication. The channel estimation must be necessary in OFDM system. Pilot tone assisted modulation (PTAM) transmits a tone with the data signal in frequency domain, on the assumption that they will be equally affected by flat fading. PTAM is a useful technique for high data rate wireless systems in OFDM system and has been proposed to overcome Rayleigh fading.
In this thesis, the DFT based interpolation and Boundary-Matching methods can improve the accuracy of channel estimation and are compared to reduce the error rate and apply it to QPSK and then show some results of computer simulations. There is a simple but effective method to improve the fading effect and proposed to reduce the effect of Gibbs phenomenon and compensation the OFDM signals via this technique over AWGN and Rayleigh channel.
We proposed a new pilot allocations on subcarrier to meet the Boundary-Matching condition for the channel estimation for OFDM systems, and it’s performance comparison with 802.11a standard is also presented. The proposed scheme can achieve higher throughput via the same data set and more accurate in the simulation with the same throughput.
Advisor Committee Chau-Yun Hsu - advisor
Ching-Kun Li - co-chair
none - co-chair
Files Date of Defense 2008-07-30 Date of Submission 2008-08-18