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The bandwidth-intensive immersive media services that were earlier confined to wired transmission are now making a foray into mobile devices. Video traffic constitutes a significant 51 percent of the mobile traffic volume and is expected to increase to 67 percent by 2017 [1, 2]. Full high definition (Full HD) video is also being increasingly shared through(More)
A random beamforming technique for MIMO systems that simultaneously obtains downlink multiuser diversity gain, spatial multiplexing gain, and array gain by feeding back only effective SNRs is described. In addition, power control using waterfilling is employed to improve the throughput of our method. In a slow fading channel, we prove that the throughput of(More)
We have demonstrated a broadband radioover-fiber communication system transmitting wireless signals at the millimeter-wave bands. The system incorporated 25km of an optical intermediate frequency feeder. 60GHz orthogonal frequency division multiplexing (OFDM) signal transmission at 155Mbps with a bit error rate (BER) of less than 10 was achieved within the(More)
High data rate at high mobile speed will still be an essential requirement for the future 5G mobile cellular system. High frequency bands above 6 GHz are particularly promising for the 5G system because of large signal bandwidths such high frequencies can offer. By using high gain beamforming antennas, the problem of high propagation loss at high(More)
In this paper, we propose a recursive space time decoding method for orthogonal frequency division multiplexing (OFDM) systems exploiting multiple transmit antenna diversity when the channels are fast fading. We first develop a computationally efficient space-time decoding method involving a matrix inversion to mitigate the channel variation effect. We then(More)
According to the commons model of cognitive radio, the activity of secondary (unlicensed) nodes is required to guarantee quality-of-service (QoS) constraints on the transmission of primary (licensed) terminals. Towards this goal, vertical handover between different radio interfaces is currently being investigated as a promising solution to enhance(More)