Exact(3)
It is assumed that the MS perfectly estimates both the desired and interference channels and feeds them back to the BS without error.
It is assumed that each user perfectly estimates the CSI of the downlink channel (from the BS to the user), which is simply referred to as downlink CSI in this paper.
In a frequency division duplexing system, channel state information is provided through a feedback channel; therefore, we assume that matrix is not perfectly known at the base station while user perfectly estimates the channel vectors once for time slot, that is, when, to obtain.
Similar(57)
As aforementioned, these BEM coefficients are assumed to be perfectly estimated by existing BEM-based channel estimation algorithms [10, 11] using pilot signals from the previous LTE time slots.
However, to evaluate the efficiency of the modulation diversity when operating in the presence of estimation errors, in the following experiments, the same rotation angles obtained for perfectly estimated channels are used.
We assume that the CSI is perfectly estimated.
In the experiments, the optimization of λ (LMS) was performed assuming that the phase is perfectly estimated, and the optimization of ρ (PLL) considered the amplitude perfectly estimated.
(2) Assuming for simplicity that the ICFO has been perfectly estimated, from (35), it follows that.
For simplicity, it is assumed that this channel and also the timing synchronization are perfectly estimated.
We show through simulation that just one pilot symbol is sufficient to perfectly estimate the channel.
We assume that the receiver can perfectly estimate the full CSI information.
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