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Browsing by Author "Ratnarajah, Tharmalingam"
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Deterministic equivalent performance analysis of time-varying massive MIMO systems
Papazafeiropoulos, Anastasios K.; Ratnarajah, Tharmalingam (2015-10-01)Delayed channel state information at the transmitter (CSIT) due to time variation of the channel, coming from the users' relative movement with regard to the BS antennas, is an inevitable degrading performance factor in ... -
Impact of Residual Additive Transceiver Hardware Impairments on Rayleigh-Product MIMO Channels with Linear Receivers : Exact and Asymptotic Analyses
Papazafeiropoulos, Anastasios; Sharma, Shree Krishna; Ratnarajah, Tharmalingam; Chatzinotas, Symeon (2018-01-31)Despite the importance of Rayleigh-product multiple-input multiple-output channels and their experimental validations, there is no work investigating their performance in the presence of residual additive transceiver ... -
Nuts and Bolts of a Realistic Stochastic Geometric Analysis of mmWave HetNets: Hardware Impairments and Channel Aging
Papazafeiropoulos, Anastasios; Ratnarajah, Tharmalingam; Kourtessis, Pandelis; Chatzinotas, Symeon (2019-03-28)Motivated by heterogeneous network (HetNet) design in improving coverage and by millimeter-wave (mmWave) transmission offering an abundance of extra spectrum, we present a general analytical framework shedding light on the ... -
Performance of massive MIMO uplink with zero-forcing receivers under delayed channels
Papazafeiropoulos, Anastasios K.; Ngo, Hien Quoc; Ratnarajah, Tharmalingam (2017-04-01)In this paper, we analyze the performance of the uplink communication of massive multicell multiple-input multiple-output (MIMO) systems under the effects of pilot contamination and delayed channels because of terminal ... -
Rate-Splitting Robustness in Multi-Pair Massive MIMO Relay Systems
Papazafeiropoulos, Anastasios; Ratnarajah, Tharmalingam (2018-08-01)Relay systems improve both coverage and system capacity. Toward this direction, a full-duplex (FD) technology, being able to boost the spectral efficiency by transmitting and receiving simultaneously on the same frequency ... -
Toward a Realistic Assessment of Multiple Antenna HCNs: Residual Additive Transceiver Hardware Impairments and Channel Aging
Papazafeiropoulos, Anastasios; Ratnarajah, Tharmalingam (2017-10-01)Given the critical dependence of broadcast channels by the accuracy of channel state information at the transmitter (CSIT), we develop a general downlink model with zero-forcing precoding, applied in realistic heterogeneous ...