Sang Soo Jeong

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We investigate the cross-layer design for the packet scheduling and resource allocation in the orthogonal frequency division multiple access (OFDMA) wireless networks. Our focus is the efficiency of the resource management scheme from the practical point of view. For physical (PHY) layer, an efficient resource allocation algorithm with low computational(More)
The cognitive radio (CR) systems usually arrange for the quiet period to detect the primary user (PU) effectively. Since all CR users do not transmit any data during quiet period, the interference caused by other CR users can be prevented in the channel sensing for PU detection. Even though the quiet period improves the PU detection performance, it degrades(More)
Relay-assisted communication can improve the quality of service (QoS) of users located at the cell boundary or the shadowed area. In this paper, we investigate the efficient resource allocation scheme for the orthogonal frequency division multiple access (OFDMA) based relaying systems. To maximize system performance, the proposed scheme exploits the spatial(More)
In cognitive radio (CR) systems, channel sensing should be performed very accurately in order to protect primary user (PU) and to achieve high spectral efficiency. Recently, there are some efforts to improve the accuracy of the channel sensing in the CR systems. In particular, it is shown that the correctness of channel sensing can be improved by combining(More)
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