標題: | 統計特性及有限回饋位元配置在具相關性多輸入多輸出正交分頻多工系統之效能分析 Performance Evaluation of Statistical Bit Loading and Limited Fddeback of Bit Loading for Correlated MIMO-OFDM Channels |
作者: | 張超任 Chang, Chao-Jen 林源倍 Lin, Yuan-Pei 電控工程研究所 |
關鍵字: | 多輸入多輸出正交分頻多工;位元配置;統計特性;相關性;MIMO-OFDM;Bit loading;statistical;correlated |
公開日期: | 2012 |
摘要: | In this thesis, we evaluate two bit loading schemes for a MIMO-OFDM
system over a channel that is correlated in time and space. For the first
scheme, we assume there is a reverse link of low transmission rate so that the
receiver can feedback quantized bit loading to the transmitter. We call this
BAfb (feedback of bit loading) scheme. In the second scheme, a statistical
bit loading is computed based on statistics of the channel. No feedback is
necessary in this case. We call this BAstat (statistical bit loading) scheme.
The simulation results show that, in general, BAfb scheme performs better
than BAstat when the channels are highly correlated in time. When the
channel is not so highly correlated in time, BAstat scheme performs better.
Furthermore, performances of BAstat does not vary with the time and it is
very useful for MIMO transmission with no feedback. In this thesis, we evaluate two bit loading schemes for a MIMO-OFDM system over a channel that is correlated in time and space. For the first scheme, we assume there is a reverse link of low transmission rate so that the receiver can feedback quantized bit loading to the transmitter. We call this BAfb (feedback of bit loading) scheme. In the second scheme, a statistical bit loading is computed based on statistics of the channel. No feedback is necessary in this case. We call this BAstat (statistical bit loading) scheme. The simulation results show that, in general, BAfb scheme performs better than BAstat when the channels are highly correlated in time. When the channel is not so highly correlated in time, BAstat scheme performs better. Furthermore, performances of BAstat does not vary with the time and it is very useful for MIMO transmission with no feedback. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT079912510 http://hdl.handle.net/11536/71862 |
顯示於類別: | 畢業論文 |