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Rate-Splitting for Multi-User Multi-Antenna Wireless Information and Power Transfer | | Yijie Mao
; Bruno Clerckx
; Victor O.K. Li
; | | Date: |
21 Feb 2019 | | Abstract: | In a multi-user multi-antenna Simultaneous Wireless Information and Power
Transfer (SWIPT) network, the transmitter sends information to the Information
Receivers (IRs) and energy to Energy Receivers (ERs) concurrently. A
conventional approach is based on Multi-User Linear Precoding (MU--LP) where
each IR directly decodes the intended stream by fully treating the interference
from other IRs and ERs as noise. In this paper, we investigate the application
of linearly-precoded Rate-Splitting (RS) in Multiple Input Single Output (MISO)
SWIPT Broadcast Channel (BC). By splitting the messages of IRs into private and
common parts and encoding the common parts into a common stream decoded by all
IRs, RS manages the interference dynamically. The precoders are designed such
that the Weighted Sum Rate (WSR) of IRs is maximized under the total transmit
power constraint and the sum energy constraint for ERs. Numerical results show
that the proposed RS-assisted strategy provides a better rate-energy tradeoff
in MISO SWIPT BC. Under a sum energy constraint of ERs, RS-assisted strategy
achieves better WSR performance of IRs than MU--LP and NOMA in a wide range of
IR and ER deployments. Hence, we draw the conclusion that RS is superior for
downlink SWIPT networks. | | Source: | arXiv, 1902.7851 | | Services: | Forum | Review | PDF | Favorites | |
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