Uplink Transmission in MU Multi-Cell Massive MIMO-FBMC Systems over Ricean Fading

This paper investigates uplink rate performance of filter bank multicarrier (FBMC)-offset quadrature amplitude modulation (OQAM) based multi-user (MU) multicell massive multiple-input multiple-output (MIMO) systems. Contrary to existing works in the FBMC literature, channel between users and the base station (BS) within a cell is modelled to be Ricean fading with a deterministic fast fading component and a random Rayleigh distributed component. Closed-form expressions for the ergodic achievable uplink sum rate and corresponding approximation are derived for the maximum ratio combining (MRC) at the BS in the presence of imperfect channel state information (CSI). This is achieved by considering the effect of pilot contamination, and the statistical characteristics of the intrinsic interference in FBMC systems. Uplink power scaling laws with imperfect CSI at the BS are investigated. Analytical results are also developed for analysing the effect of the Ricean-K factor on the achievable uplink sum rate. Numerical examples are presented to demonstrate the tightness between the analysis and simulations, and to compare the performance of FBMC-OQAM and traditional OFDM-based MU multi-cell massive MIMO systems.