Interference alignment and cancellation
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
Random access heterogeneous MIMO networks
Proceedings of the ACM SIGCOMM 2011 conference
Fast transfer of channel state information in wireless systems
IEEE Transactions on Signal Processing
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Exchanging the channel state information (CSI) in a multiuser WLAN is considered an extremely expensive overhead. A possible solution to reduce the overhead is to notify the analog value of the CSI, which is also known as analog channel feedback. It however only allows nodes to overhear an imperfect channel information. While some previous studies have theoretically analyzed the performance of analog channel feedback, this work aims at addressing issues of realizing it in practice and empirically demonstrating its effectiveness. Our prototype implementation using USRP-N200 shows that analog channel feedback produces a small error comparable to that of estimating CSI using reciprocity, but however can be applied to more general scenarios.