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• W2071331544 abstract "A distributed coherent transmission scheme in which two or more transmit nodes form a beam toward an intended receiver while directing nulls at a number of other “protected” receivers is considered. Unlike pure distributed beamforming, where the ith transmit coefficient depends only on the ith transmit node's channel to the intended receiver, the transmit coefficients of a distributed nullformer each depend on the channel responses from all of the transmit nodes to all of the protected nodes. The requirement for each transmit node to know all of the channels in the system makes distributed transmit nullforming challenging to implement in the presence of channel time variations. This paper describes a receiver-coordinated distributed transmission protocol, in the context of a state-space dynamic channel model, in which the receive nodes feed back periodic channel measurements to the transmit cluster. The transmit nodes use this feedback to generate optimal channel predictions and then calculate a time-varying transmit vector that minimizes the average total power at the protected receivers while satisfying an average power constraint at the intended receiver during distributed transmission. We demonstrate via analysis and numerical simulation the efficacy of the technique even with low channel measurement overhead, infrequent update intervals, and significant feedback latency." @default.
• W2071331544 created "2016-06-24" @default.
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• W2071331544 date "2012-03-01" @default.
• W2071331544 modified "2023-10-14" @default.
• W2071331544 title "Receiver-coordinated distributed transmit nullforming with channel state uncertainty" @default.
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• W2071331544 doi "https://doi.org/10.1109/ciss.2012.6310822" @default.
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