Spatially Sparse Precoding in Millimeter Wave MIMO Systems
Citations
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Cites background from "Spatially Sparse Precoding in Milli..."
...Although beamforming optimization under unit-modulus constraints has been studied in the research on constant-envelope precoding [11], [12] as well as hybrid digital/analog processing [13], [14], such designs are mainly restricted to either the transmitter or the receiver side, which are not applicable to our considered joint active and passive beamforming optimization at both the AP and IRS....
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2,424 citations
Cites background or methods from "Spatially Sparse Precoding in Milli..."
...The path amplitudes are assumed to be Rayleigh distributed, i.e., with the average power gain....
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...This difference leads to a novel formulation of the arbitrary beamwidth beamforming design problem in addition to a completely new way for realizing these vectors using analog/digital architecture as will be explained shortly....
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...If is the combined BS precoding matrix, the discrete-time transmitted signal is then (1) where is the 1 vector of transmitted symbols, such that , and is the average total transmit power....
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...Despite the reduced complexity of [3], [7]–[11], they generally share the disadvantage of converging towards only one communication beam....
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...This formulation captures the sparse nature of the channel, and enables leveraging tools developed in the adaptive compressed sensing (CS) field to design efficient estimation algorithms for mmWave channels....
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2,380 citations
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Cites background from "Spatially Sparse Precoding in Milli..."
...Design strategies for HBF can maximize some performance metric over the feasible space of (FRF, FBB) which is limited by transmit power and phase shifting constraints (elements of FRF must have unit magnitude [19], [120])....
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...Another common approach is to select a target precoder and minimize ||Ftarget− FRFFBB|| over the feasible space [19], [123], [124]....
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...directions as well as global channel information in precoder design [19], [120]....
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...A typical “fully connected” structure [17], [19], [20], [120] breaks the precoder down into F = FRFFBB, where the Nt × NRF analog precoder, FRF, links the Nt antennas to the NRF chains and performs analog phase shifting, while the NRF × Ns precoder, FBB operates digitally (see Fig....
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...base station [19], [20], [87], [88], [120], [121]....
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References
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"Spatially Sparse Precoding in Milli..." refers background in this paper
...Alternatively, (18) can be solved using tools from [39]–[42], [49]....
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33,341 citations
8,604 citations
"Spatially Sparse Precoding in Milli..." refers background or methods in this paper
...Alternatively, (18) can be solved using tools from [39]–[42], [49]....
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...So, for the general case of Ns ≥ 1, we present an algorithmic solution based on the well-known concept of orthogonal matching pursuit [39], [41], [49]....
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...Thus, the extensive literature on sparse reconstruction can now be used for hybrid precoder design [39], [41]....
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...We thus provide an algorithmic precoding solution based on the concept of orthogonal matching pursuit [39], [41], [49]....
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7,124 citations
3,865 citations