Cell-free massive multiple-input multipleoutput (CF-mMIMO) is one of the components of the fth-generation mobile communications, where a large number of distributed access points (APs) serve many users simultaneously, and provides scalability and high capacity data transmission. However, resource usage increases as the number of APs and user equipment (UEs) grows in the network, and practical systems need to meet these requirements. In this work, we evaluate resource usage of the fronthaul (FH) link capacity using two precoding methods, zero-forcing and conjugate beamforming, with regards to user data and channel state information (CSI) transmission.
Integrated Access Backhaul (IAB) is an alternative to decrease the cost of 5G deployments. Nevertheless, the IAB imposes the carrier frequency and time synchronization to be implemented over-the-air (OTA), which have strict requirements for scenarios with multiple-input multiple-output (MIMO), carrier aggregation (CA) and Time Division Duplex (TDD). This work analyzes time and frequency synchronization in an IAB architecture using algorithms that estimate only timing and carrier frequency offset (CFO). Simulation results show that the CFO and TDD time offset (TO) requirements are attended in all SNR cases. However, for CA and MIMO, the requirements are met only when SNR ≥ 8 dB.
