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Although this type of pilot allocation simplifies the channel estimation, it presents some drawbacks.
This type of pilot allocation can be found in the fixed WIMAX standard [33].
Instead, they are assumed to transmit a new type of pilot symbols, discovery reference signals (DRS), required for small cell discovery and initial channel estimation purposes.
Because people are crazy, spiteful, and clumsy, the FAA plans some type of pilot certification of unmanned aerial vehicles (UAVs), which could become the driver's license of the 21st century.
Therefore, on the DL, we would need only one type of pilot symbols for CSI estimation, while on the UL we need two types of pilots that are used for estimation of over-the-air UT's MIMO channel matrices and the effective channel matrices.
Goals of this type of pilot study were to provide understandings of program acceptability, estimates of effect sizes, and insights to guide program development [ 58].
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Different types of pilot symbols used in MIMO channel estimation are described in [15].
In [7], the authors proposed an estimator employing a specific pilot structure consisting of two types of pilot symbols with different pilot densities.
The direct-detected optical OFDM (DDO-OFDM) system in frequency-selective fading fiber channel with three different types of pilot interval design has been experimentally investigated.
The goal is that, by scaling up these types of pilot projects, utility-managed EV charging can assist China's power sector to move towards the goals outlined in the NEA's work plan: a flexible electricity grid and a diverse set of uses for China's renewable energy resources.
Other types of pilot studies such as feasibility studies for randomized trials would be ideal in terms of integrating REA.
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