Optimized DFT-FB Transceivers over LTV Channels

論文發表人：劉智豪（加州理工學院電機工程學系博士班）

 

http://www.asilomarssc.org/

 

我們探討傅立葉調變濾波器組收發器（DFT-FBT）在線性時變通道（LTV）的最佳化設計。DFT-FBT 收發機包含了Affine-OFDM 及Chirped-OFDM，這些收發機在近期文獻中被建議應用在LTV的傳輸通道。對於已知無線通道以及只知統計特性的WSSUS統 計通道，我們將展示如何優化DFT-FBT的發射和接收濾波器原型，使的在接收端信號干擾噪聲比最大化。優化後，收發機隨著通道改變的部分，如OFDM技術， 是一組在接收器端的乘法器，它們根據等效的通道以一區塊時間為週期更新。模擬結果顯示，最佳化後的DFT-FBT在LTV 通道的誤碼率（BER）性能比先前文獻所提出的Affine OFDM 為優。

 

In this work, we consider the optimization of DFT modulated filterbank transceiver (DFT-FBT) over linear time varying (LTV) channels. The DFT-FBT is a generalization of the Affine Fourier transform based OFDM (Affine OFDM) and the chirped OFDM, which are suggested in recent literature for the transmission over LTV channels. For both known LTV channels and unknown wide sense stationary uncorrelated scattering (WSSUS) statistical channels, we show how to optimize the transmitting and receiving prototypes of DFT-FBT such that the signal to interference and noise ratio (SINR) at the receiver is maximized. After the optimization, the channel dependent part, like OFDM, is a set of scalar multipliers at the receiver end that adapts to the equivalent memoryless channel on a block basis. Simulation results show that the bit error rate (BER) performance of the optimized DFT-FBT  over LTV channels is superior to the Affine OFDM.