Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2016
Session Number:T2-1
Session:
Number:4750
Optimal Estimation Interval for Time-Varying V-BLAST Channels
Pisit Vanichchanunt, Kritsada Mamat, Panupat Wipaweeponkul, Thousapol Thitivorakarn, Lunchakorn Wuttisittikulkij ,
pp.467-470
Publication Date:2016/7/10
Online ISSN:2188-5079
Summary:
In this paper, we study an effect of channel estimation error on time-varying V-BLAST system. A first-order auto regressive (AR) is introduced to model the time evolution characteristic. The receiver can obtain the current channel information by using a pilot symbol. The estimation accuracy depends on amount of pilot symbols. Based on the received signal, the receiver uses an estimated channel matrix to detect the transmit symbol where Maximum Likelihood (ML), Zero-Forcing (ZF) and Minimum Mean Square Error (MMSE) are applied. For given total amount of pilot symbol and interested time period, we propose to divide all channels into equal intervals or groups, which each group uses the same estimated channel. We also specify an optimal number of groups and show that the optimal number of groups mainly depends on time correlation parameter and training budget. Numerical results show that the system can achieve the performance closest to perfect channel estimation when operating on a suitable estimation interval.