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This is not due to the lack of pilot subcarriers at the edges of the OFDM symbol, but due to insignificant power allocated to the pilot symbols close to the null subcarriers.
The reference (equi-spaced equi-powered) design does a poor job of estimating channel close to the null subcarriers, this is due to the lack of pilot subcarriers at the edges of the OFDM symbol.
The unit had been forced to cut back its operational strength from 18 aircraft to 15 due to lack of pilot replacements and a shortage of spare parts for the aging Triplanes.
The lack of pilot testing of the questionnaire is a limitation in the current study, but this limitation is mitigated by the use of items from previously developed questionnaires and by involvement of representatives of the survey population in the construction.
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Trying to avert a pilots' strike, Air Canada canceled at least 49 flights in the last two days, affecting 4,500 passengers, because of a lack of pilots.
The highest daily number of cancellations because of crew shortages during that period was 37, and Delta normally cancels 2 flights a day because of lack of pilots, said Dave Bushy, Delta's senior vice president for operations in a recorded announcement.
These regulations caused a temporary lack of pilots.
Bad weather, contrary winds, and lack of pilots familiar with the Saint Lawrence River hampered progress, and Phips did not anchor in the Quebec basin until 16 October.
The Well-Oiled Machinery of Privatized War: And speaking of drones, as the New York Times reported on September 5th, the U.S. drone program does have one problem: a lack of pilots.
At Kopervik the German plans suffered a delay because of a lack of pilots to guide the ship northwards, Alster continuing later that day, while Kattegat departed Kopervik only on 6 April.
The standard pilot design does a poor job of estimating channel at the subcarriers near the guard band, due to lack of the pilot subcarriers at the edge of the OFDM symbol in IEEE 802.16e standard pilots.
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