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This paper studies the rate maximization problem and designs the beamforming strategy for relay-aided multiuser multiantenna cognitive radio (CR) network that coexists with a primary radio (PR) system via opportunistic spectrum sharing (OSS). The beamforming is characterized by two layers: 1) Cognitive beamforming (CB) is employed by CR base station (BS), CR relay station (RS), and secondary users...
In this paper, we study the problem of the lifetime maximization in a new type of multi-hop relay network where the amplify-and-forward (AF) and the decode-and-forward (DF) relay nodes are alternatingly cascaded. In order to cope with the general frequency selective fading channel, the orthogonal frequency division multiplexing (OFDM) modulation is adopted over each hop. We formulate the optimization...
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