This work studies the uplink of a cellular network with zero-forcing (ZF) receivers under imperfect channel state information at the base station. More specifically, apart from the pilot contamination, we investigate the effect of time variation of the channel due to the relative users' movement with regard to the base station. Our contributions include analytical expressions for the sum-rate with finite number of BS antennas, and also the asymptotic limits with infinite power and number of BS antennas, respectively. The numerical results provide interesting insights on how the user mobility degrades the system performance which extends previous results in the literature.
|Title of host publication||2014 IEEE 25th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Number of pages||6|
|Publication status||Published - 29 Jun 2015|
Papazafeiropoulos, A. K., Ngo, H. Q., Matthaiou, M., & Ratnarajah, T. (2015). Uplink Performance of Conventional and Massive MIMO Cellular Systems with Delayed CSIT. In 2014 IEEE 25th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC) (pp. 601-606). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/PIMRC.2014.7136236