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In wireless positioning, estimating the location of a receiver is very challenging since the receiver does not transmit signals. The difficulty is to obtain the distance between the anchors and the silent receiver. To deal with the issue, this paper proposes to use the full-duplex relay technique to estimate the anchor-receiver distance. Then, we can obtain the location of the silent receiver. With...
Recently, a proactive estimation method has been proposed to obtain the cross-channel gain from cognitive transmitter (CT) to primary receiver (PR), where CT acts as a full-duplex amplified-and-forward (AF) relay for primary users. However, since the cognitive and primary users usually have no cooperation, it has no guarantee that the direct and relay signals are synchronized, i.e., the time delay...
In cognitive radio systems, it is very challenging to estimate the channel gains from the cognitive transmitter to the primary receiver and even those between primary transceivers. Recent studies show that both kinds of the channel gains can be obtained if the cognitive user acts as a full-duplex relay in symmetric time-division duplex (TDD) primary systems. However, in practice, most systems are...
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