Optimal Precoder Design for Distributed Transmit Beamforming Over Frequency-Selective Channels

We consider the problem of optimal precoder design for a multi-input single-output wideband wireless system to maximize two different figures of merit: the total communication capacity and the total received power, subject to individual power constraints on each transmit element. We show that the tw...

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Vydáno v:IEEE transactions on wireless communications Ročník 17; číslo 11; s. 7759 - 7773
Hlavní autoři: Goguri, Sairam, Ogbe, Dennis, Dasgupta, Soura, Mudumbai, Raghuraman, Brown, D. Richard, Love, David J., Madhow, Upamanyu
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.11.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Array signal processing
Beamforming
Broadband
Channels
Communications systems
distributed beamforming
Maximization
MIMO communication
Numerical analysis
Optimization
Precoding
Receivers
Separation
Transmitters
waterfilling
Wideband
Wideband precoding
Wireless communication
Wireless communications
ISSN:1536-1276, 1558-2248
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Popis
Shrnutí:We consider the problem of optimal precoder design for a multi-input single-output wideband wireless system to maximize two different figures of merit: the total communication capacity and the total received power, subject to individual power constraints on each transmit element. We show that the two optimal precoders satisfy a separation principle that reveals a simple structure for these precoders. We use this separation principle extensively to derive several interesting properties of these two optimal precoders. Some key analytical results are as follows. We show that the power-maximizing precoders must concentrate all their energy in a small number of active channels that cannot exceed the number of input terminals. The capacity-maximizing precoder turns out to be very different from the classical water filling solutions and also very different from the power-maximizing precoders except at asymptotically low SNRs where the power-maximizing precoders also maximize capacity. We also show that the capacity of the wideband system is lower bounded by the sum rate of a multiple-access channel with the same channel gains and power constraints. Finally, the separation principle also yields simple fixed-point algorithms that allow for the efficient numerical computation of the two optimal precoders.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2018.2870649