With the properly designed separable pilot symbols, a multiuser signal separation can be achieved and a multiuser channel estimator can be designed as well.
As discussed earlier for consent processes, separation of pilot and main phase protocol approval presents logistical challenges.
Figure 3 depicts an example of the cost function for a Alamouti OFDM system with subcarriers, sampling interval nanoseconds and pilot separation.
Working with the minute quantities of plutonium available at the Metallurgical Laboratory in 1942, a team under Charles M. Cooper developed a lanthanum fluoride process for separating uranium and plutonium, which was chosen for the pilot separation plant.
Robert S. Norris, the author of "Racing for the Bomb," a biography of Gen. Leslie R. Groves, the military leader of the Manhattan Project, said that some plutonium was produced even earlier at Oak Ridge, using a pilot separation plant.
The transmitted OFDM symbols carried pilots and data, with a pilot separation.
The pilot separation can range from 1 (particular case where all subcarriers in the OFDM symbol are dedicated to transmit pilots training symbol) to, fulfilling the condition.
We further see that the range in which the synchronization is successful is much smaller than in the downlink case, but this is mainly due to the larger pilot separation.
The elements of the noise vector can be expressed by (24). Figure 2 depicts an example of the constitution of vector for a system with 2 transmission antennas, subcarriers and pilot separation.
Further, a novel joint FTD and channel estimation scheme, based on iterative interference cancelation, permits extending the FTD estimation range well beyond the limit imposed by the pilot separation.
