Exact(4)
However, due to the semi-orthogonal pilot pattern, SIC-based channel estimation is adopted, leading to a larger estimation error than the conventional one.
When the number of arriving tags substantially varies, i.e., α ≤ 1 and β ≤ 1, SBA0, which uses the information of the last frame, generates a larger estimation error and degrades performance.
Particularly, towards the edge of the LTE downlink subframe (i.e. at the 14th, 28th, 42th, 56th OFDM symbols), a larger estimation error occurs in the LS estimation which can be seen clearly in Figure 4b.
Furthermore, it is noticed that a contradiction between rapidity and accuracy always appears together with the advancement of FOLMS algorithm; namely, a larger value of the gradient order can not only give a faster convergence speed, but also correspond to a larger estimation error.
Similar(56)
The large buffer can overcome a large estimation error.
However, many engineers are reluctant to use this method because many researchers have pointed out that the method possibly contains a large estimation error.
However, as the links among the sensors increase, the 2D algorithm has many chances to fall into local minima and hence incurs a large estimation error.
Due to the unstable driving behavior, short road segments for training of SmartLoc may lead to a large estimation error in each time slot.
Although the high-order Yule-Walker (HOYW) method does not require a priori estimate of the noise variance, it suffers from a singularity problem and has a large estimation variance [4].
Because of the special geometry of forward scatter radar, parameters (i.e., Dopplershift, azimuth angle, elevation angle) cannot directly be measured when the targetcrosses the baseline, resulting in a large estimation error and seriously decreasing thetracking precision.
This may potentially lead to a large estimation bias in economic analyses for the target country if it has domestic regions with various heterogeneities in terms of regional economic endowments, geographic locations, developmental stages, industrial structures, and foreign independency.
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