Identification and Estimation of unknown and time-invariant fading channels for OFDM systems
Date Issued
2007
Date
2007
Author(s)
Lin, Hong-Wei
DOI
zh-TW
Abstract
This paper is talk about the performance evaluation under different deterministic time-invariant channel profiles like as continuous, cluster, two path channel profiles using maximum likelihood channel estimation (MLE) scheme in Orthogonal Frequency Division Multiplexing (OFDM) communication system to obtain the channel information and utilizing it for further equalization.
According to the Channel statistics we have to improve the maximum likelihood channel estimation accuracy under partial known channel information by involving a channel power detection threshold to help us deal with path estimation and gain a 2~3 dB system performance improvement. We can find the result in corresponding simulations.
Finally, we propose an Averaged Window size algorithm to decide the channel statistics needed for MLE channel estimation by transmitting preamble in training sequence under unknown channel profile and discuss the performance of the Average Window size algorithm with error detection probability as an evaluation index.
Subjects
正交分頻多工
最大概似通道估測
非時變通道
通道功率估測臨界值
多重路徑估測
平均視窗尺度演算法
time-invariant channel
maximum likelihood channel estimation
Orthogonal Frequency Division Multiplexing
channel power detection threshold
path estimation
Averaged Window size algorithm
Type
thesis