Downlink Hybrid Information and Energy Transfer With Massive MIMO

We consider a downlink massive MIMO system, where the base station simultaneously sends information and energy to information users and energy users, respectively. The aim is to maximize the minimum harvested energy among the energy users while meeting the rate requirements of information users. Wit...

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Vydáno v:IEEE transactions on wireless communications Ročník 15; číslo 2; s. 1309 - 1322
Hlavní autoři: Zhao, Long, Wang, Xiaodong, Zheng, Kan
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York IEEE 01.02.2016
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:
Allocations
Asymptotic properties
Channel estimation
Channels
Communication channels
distributed cooperation
Downlink
Energy exchange
Energy transfer
Massive MIMO
MIMO
Optimization
Pilots
precoding
Resource management
Service introduction
Uplink
User requirements
Wireless communication
wireless energy transfer
distributed cooperation
precoding
wireless energy transfer
Massive MIMO
ISSN:1536-1276, 1558-2248
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Shrnutí:We consider a downlink massive MIMO system, where the base station simultaneously sends information and energy to information users and energy users, respectively. The aim is to maximize the minimum harvested energy among the energy users while meeting the rate requirements of information users. With perfect channel state information (CSI), the problem is solved by obtaining the asymptotically optimal power allocation of information users and the combination coefficients of the energy precoder. For the CSI estimation in time-division duplex systems, orthogonal pilot sequences are employed by information users during the uplink, and one common pilot sequence is shared by all energy users. It is shown that the energy-harvesting performance of such a shared pilot scheme is always better than that of the orthogonal pilot scheme. Further, exploiting the intercell interference in multicell systems, a joint precoder is proposed for cooperative energy transfer, for which both the centralized and distributed implementations are given. Results indicate that the cooperative energy transfer always outperforms the noncooperative scheme with either perfect or estimated CSI.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2015.2488647