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- Title
Robust precoder design for massive MIMO with peak total power constrained single-RFchain transmitters.
- Authors
Soleimani, Maliheh; Mazrouei-Sebdani, Mahmood; Elliott, Robert C.; Krzymień, Witold A.; Melzer, Jordan
- Abstract
Massive multiple-input multiple-output (MIMO) transmission/reception is a very promising enabling technique for future cellular systems. The performance of massive MIMO systems relies on the availability of channel state information (CSI) at the transmitter. However, due to estimation errors and delay this CSI is imperfect. Additionally, the use of many radio frequency (RF) chains to drive a large number of antennas at the transmitter quickly becomes impractical when that number increases. Thus, reducing the number of RF chains in massive MIMO systems is essential in order to reduce the system complexity and cost. Considering a massive MIMO system with a single-RF-chain transmitter, in this study, the authors design a precoding technique that is robust to the channel uncertainty. To reflect realistic restrictions in the author's design, they consider the peak total transmitted power rather than the average power constraint. Also, they consider imperfect CSI and model the uncertainty region as a bounded one, which is a reasonable assumption. In this transmitter structure, there is only one power amplifier and load modulation rather than voltage modulation is used to generate the desired signals on the antenna elements. They demonstrate that when a very simple fixed equaliser is used at all user terminals, the problem of minimising the meansquare error of the received signals at user terminals under the worst-case channel uncertainty can be transformed into a convex optimisation problem. They provide simulation results and demonstrate that the proposed robust precoding technique outperforms non-robust techniques in terms of power efficiency and signal-to-interference-plus-noise ratios.
- Subjects
MIMO systems; WIRELESS communications; RADIO frequency; TRANSMITTERS (Communication); ROBUST control
- Publication
IET Communications (Wiley-Blackwell), 2017, Vol 11, Issue 17, p2667
- ISSN
1751-8628
- Publication type
Article
- DOI
10.1049/iet-com.2016.0552