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URN etd-0710105-155532 Statistics This thesis had been viewed 2583 times. Download 1859 times. Author Yun-Sheng Ji Author's Email Address No Public. Department Communication Engineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 67 Title the reduction of out-of-band power emission in OFDM Keyword out-of-band OFDM OFDM out-of-band Abstract Due to the growth in wireless communications, more efficient utilization of spectrum is necessary. The increased sharing of spectrum translates into a higher likelihood of users interfering with one another. Therefore, interference rejection becomes an important issue in digital wireless communications.
In order to gain high bandwidth efficiency, we try to reduce the out-of-band power. By our proposed method, it can reduce the adjacent interference indeed. By the way, this method has drawback: peak-power phenomenon. To eliminate this problem, we add a constraint, and solve it indeed. Thus, the object of gaining high bandwidth efficiency will be achieved and more channels may be allowed in the specific frequency band.
According to our simulation, two advantages can be achieved as follows:
1. We only need to insert two auxiliary data into the original null subcarriers for reducing out-of-band power.
2. Reduce the out-of-band power spectrum.
3. The drawback of peak-power phenomenon can be reduced dramatically.
4. Increase the spectral efficiency.
5. Do not need to change hardware of current systems.
Advisor Committee Chau-Yun Hsu - advisor
Jie-Cherng Liu - co-chair
none - co-chair
Files Date of Defense 2005-06-16 Date of Submission 2005-07-10