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Relaying primary signals by cognitive base-stations (CBSs) can help the primary system and thus win CBSs a higher chance to transmit their own signals. For this purpose, conventional zero-forcing (CZF) beamforming is a straightforward solution where the primary and cognitive signals are transmitted from a multi-antenna CBS without causing interference to each other. However, with CZF, no priority...
Consider a decode-and-forward (DF) based cooperative system where a multi-antenna base-station (source) transmits information to a single-antenna destination (D) with the help of multiple single-antenna relays ({Ri}). The optimal transmit weighting vector at the source is not available in the literature due to the non-linear DF operation, which causes the problem non-convex. By investigating the single-relay...
Relaying of the primary signals by cognitive base- stations (CBSs) can help the primary system and thus win CBSs a higher chance to transmit their own signals. For this purpose, conventional zero- forcing (CZF) beamforming is a straightforward solution where the primary and cognitive signals are transmitted from a multi-antenna CBS without causing interference to each other. However, with CZF, no...
Cooperative communication has been receiving significant attention in recent years because of the great potential for performance improvement. In this paper, we will consider the joint design of transmit and cooperative beamforming vectors in cooperative systems with a multi-antenna source and multiple single-antenna relays. The cooperative beamforming, performed by distributed relay nodes, is different...
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