Grassmannian Predictive Coding
for Delayed Limited Feedback MIMO Systems



Takao Inoue and Robert W. Heath Jr.


Proc. of Allerton Conf. on Comm. Control and Comp., Sept 30 - Oct 2, 2009, pp. 783-788.


Codebook based limited feedback technique in multiple antenna wireless systems is an attractive technique to obtain partial channel state information at the transmitter. When the downlink channel is time-varying, however, selected codeword may become outdated before its use at the transmitter. To overcome this problem, we investigate a Grassmannian predictive coding framework in which prediction is performed on the channel information at both the transmitter and the receiver. Limited feedback is used to efficiently provide correction to the prediction thereby adapting to the changes in the channel. Analysis and simulation results show that the proposed framework provides performance approaching systems with perfect channel state information at the transmitter.