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Research on Noise Estimation for LTE systems

In this thesis, we study the noise power estimation in the LTE system. Two approaches, the weight method and the subspace method, are considered.
The performance of noise power estimation using the weight method highly depends on the accuracy of the channel estimation.
The channel estimation usually gets poor results under scenarios with long delay spreads. Therefore, the weight method also gets poor result.
To overcome the mentioned drawback, we propose the subspace method which is independent from the channel estimation.
From simulation results, we observe that the subspace method gets bias results. However, the bias depends on the length of the observation window and only gets a little influence from the channel conditions.
Therefore, we can correct the bias using a simple look-up-table approach. Computer simulations show that the subspace method gets the more accurate result than the weight method.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-1018111-160547
Date18 October 2011
CreatorsChou, Huan-Chin
ContributorsTsang-Yi Wang, Wan-Jen Huang, Chao-Kai Wen, Fan-Shuo Tseng, Chih-Peng Li
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-1018111-160547
Rightsuser_define, Copyright information available at source archive

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