This paper tackles the problem of channel state information acquisition in mobile frequency-division-duplex largescale antenna systems and proposes a novel low-complexity lowoverhead method to track time-varying channels. Given the
spatial reciprocity between uplink and downlink, the frequencyindependent parameters are tracked from the uplink, greatly
reducing the training and feedback overhead in the downlink.
The uplink tracking method consists of two major modules.
The first detection module works at the initial time instance to
accurately estimate parameters by a comprehensive algorithm.
Then, the second tracking module works at the subsequent instances to track the changes by utilizing a low-overhead algorithm
as well as the parameters obtained at the previous instance.
Especially, a simplified dictionary is further designed to decrease
the computational complexity of the tracking module. Numerical
results demonstrate that the proposed tracking method can
successfully detect the newly occurred and disappeared paths,
and accurately trace the changes of the time-varying channel.
|Title of host publication||90th IEEE Vehicular Technology Conference (VTC 2019): Proceedings|
|Publisher|| IEEE |
|Number of pages||5|
|Publication status||Published - 2019|
|Name||Vehicular Technology Conference (VTC): Proceedings 2019|