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This paper proposes a novel joint channel estimation and beamforming approachfor multicell wideband massive multiple input multiple output (MIMO) systems.With the proposed channel estimation and beamforming approach, we determine thenumber of cells $N_c$ that can utilize the same time and frequency resourcewhile mitigating the effect of pilot contamination. The proposed approachexploits the multipath characteristics of wideband channels. Specifically, whenthe channel has a maximum of $L$ multipath taps, \textcolor{red}{it is shownthat $N_c\leq L$ cells can estimate the channels of their user equipments (UEs)and perform beamforming while mitigating the effect of pilot contamination.} Ina typical long term evolution (LTE) channel environment having delay spread$T_d=4.69\mu$ second and channel bandwidth $B=2.5$MHz, we have found that$L=18$ cells can use this band. In practice, $T_d$ is constant for a particularenvironment and carrier frequency, and hence $L$ increases as the bandwidthincreases. All the analytical expressions have been validated, and thesuperiority of the proposed design over the existing ones is demonstrated usingextensive numerical simulations both for correlated and uncorrelated channels.The proposed channel estimation and beamforming design is linear and simple toimplement.

Pilot Contamination for Wideband Massive MMO: Number of cells Vs Multipath