Equalization of unknown frequency- and time-selective multiple input multiple output (MIMO) channels is often carried out by means of decision feedback receivers.
This study investigates the impact of transmitter noise on the performance of several MIMO systems, namely, linear and decision feedback receivers, as well as linear, Tomlinson-Harashima, and vector precoders.
Basically, we conclude that transmitter noise has little impact on the performance--expressed in terms of uncoded BER versus signal-to-noise ratio at the receiver--of MIMO linear and decision feedback receivers, but marginal performance improvements can be expected when considering transmitter noise in the receiver design.
The next, most obvious, conclusion could be that teachers seemed to be unable to take their role as good feedback receivers and continuous learners or forgot to do so in the stress that comes along with receiving feedback.
However, being a good role model means that, at some point, teachers will have to take their role as good feedback receivers and show commitment to it and have a positive critical attitude towards learning, i.e. professional development.
Lamare et al. proposed a low-complexity near-optimal ordering MMSE design criteria [13] for efficient decision-feedback receiver structure along with successive, parallel and iterative interference cancellation structures.
However, decision-feedback receivers suffer from the major drawback of error propagation caused by feeding back erroneous decisions.
The complexity associated with these techniques led to the investigation of low-complexity solutions as sub-optimal linear multi-user receivers [9], iterative multi-user receivers [10, 11], and decision-feedback receivers [12, 13].
We show that the performance of MIMO linear and decision-feedback receivers is not significantly influenced by the presence of transmitter noise, which does not hold true in the case of MIMO systems with precoding.
An OPA policy for EH wireless communications with limited channel feedback from receiver is investigated in [4] where the receiver periodically sends only 1-b feedback by comparing channel power gain with a predetermined threshold.
Transmitter Block size GI Datata modulation QPSK Channel -path block Rayleigh fading with Relay Protocol Amplify-and-forward Feedback Perfect Receiver FDE ZF Channel estimation Pilot-assisted.
