Uplink Multiuser MIMO‐OFDM System in the Presence of Phase Noises, Power Imbalance, and Correlation

Abstract

The effects of phase noises (PNs), power imbalances, and correlations on multiuser orthogonal frequency division multiplexing (OFDM) multiple-input multiple-output (MIMO) systems are studied. It is assumed that each user is equipped with a single antenna, whereas the base station (BS) has multiple antennas and use zero-forcing (ZF) decoder for multiuser detection. Since each user has an independent oscillator, the received uplink (UL) signal at each BS antenna is corrupted by all of these independent PNs. Furthermore, there may be power imbalances and correlations (due to common scatterers) between different users. These impairments are jointly analyzed in this work. A closed-form expression of the mean square error (MSE) performance of the multiuser MIMO-OFDM system is derived. The analytical results are verified by simulations.

Performance Investigation of Phase noise compensation in millimeter wave MIMO-OFDMA Systems

“…When using an independent oscillator manner, a MIMO-OFDMA system requires more antennas due to the different effects that the combined phase noise of the transmitter (Tx) and receiver (Rx) has on the system. To reduce [42] the effects of receiver phase noise in an autonomous oscillator condition, receive antennas are used in the highest ratio possible when combined with single carrier MIMO systems. Phase noise for SVD-based spatial multiplexing & beamforming MIMO-OFDMA systems will be reduced through the inclusion of extra antennas at the transmitter & the receiver sides [18].…”