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In this paper, worst-case robust beamforming to minimize the transmit power with quality of service (QoS) constraint is investigated for wireless relay networks with direct link. To be practical, channel errors are assumed for all the links including source-to-relay, relay-to-destination, and direct source-to-destination links. The signals coming from the relay link and direct link are combined by...
A new approach to distributed cooperative beamforming in two-way half-duplex relay networks with frequency selective channels is proposed. In our scheme, two transceivers simultaneously transmit the signals they wish to exchange to the relays. The relay received signals are the sum of the channel-convoluted versions of the transmitted signals. Each relay retransmits a filtered version of its received...
A new approach to distributed cooperative beamforming in relay networks with frequency selective fading is proposed. It is assumed that all the relay nodes are equipped with finite impulse response (FIR) filters and use a filter-and-forward (FF) strategy to compensate for the transmitter-to-relay and relay-to-destination channels. Three relevant half-duplex distributed beamforming problems are considered...
A half-duplex distributed beamforming technique for relay networks with frequency selective fading channels is developed. The network relays use the filter-and-forward (FF) strategy to compensate for the transmitter-to-relay and relay-to-destination channels using finite impulse response (FIR) filters. With the channel state information (CSI) being available at the receiver, the transmit relay power...
We study the problem of multiuser downlink beamforming under the assumption that only an erroneous channel state information (CSI) is available at the transmitter. The optimization criterion is to minimize the total transmit power subject to the constraints that the user worst-case signal-to-interference-plus-noise ratios (SINRs) are above a pre-defined quality of service (QoS) threshold. In contrast...
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