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In an underlay cognitive radio network, the cross-channel gain from a cognitive transmitter (CT) to a primary receiver (PR) is crucial for spectrum sharing. By exploiting the relaying capability of the CT, we propose a proactive estimation scheme for the cross-channel gain. Specifically, the CT proactively acts as a full-duplex amplify-and-forward (AF) relay for primary transceivers to trigger the...
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...
In this paper we investigate the channel estimation and data transmission scheme for bi-directional relaying applied in cellular systems. We propose a novel pilot-aided transmission strategy to realize the efficient data exchange between Base Station (BS) and Mobile Station (MS) via a fixed Relay Node (RN). Based on the characteristics of the BS-RN link, the transmitted signals at the BS are pre-equalized...
We examine the ergodic capacity of beamforming over a multiple-input single-output (MISO) time-selective channel with channel estimation error and delayed limited feedback. At each frame, the receiver obtains the minimum mean squared error estimation of the channel, chooses a transmit beamforming vector, according to the error channel estimation, from a codebook based on random vector quantization...
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