Statistical Description of Channel Estimation Error in Massive MIMO Systems With Ricean Fading

This presentation showcases the channel estimation performance in massive multiple-input multiple-output (MIMO) systems with Ricean fading through considering the relative channel estimation error (RCEE) metric. The closed-form expressions of the probability distribution function (PDF) and cumulative distributionfunction of RCEE are derived, according to which the PDFs of RCEE with Rayleigh fading and pure line-of-sight (LoS) propagation are obtained as special cases. Through analyzing RCEE, it notesthat asthe number of base-station antennasM becomes unbounded, RCEE approaches a given constant. Moreover, the asymptotic analysis proves that, in high M-regime, the increasing rate of the RCEE scales in the order of M^1/2 for Rayleigh fading and pure LoS propagation, while the scaling order with general Ricean fading is capped by M^1/2. All the above mentioned results are verified through Monte-Carlo simulations.