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Precoder Design for Simultaneous Wireless Information and Power Transfer Systems With Finite-Alphabet Inputs
- Source :
- IEEE Transactions on Vehicular Technology. 66:9085-9097
- Publication Year :
- 2017
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2017.
-
Abstract
- Existing research on a simultaneous wireless information and power transfer (SWIPT) system is based on the assumption of Gaussian inputs. However, the optimal design on Gaussian inputs may lead to dramatic performance loss for practical systems with finite-alphabet inputs. This paper focuses on the precoder design for a SWIPT system with finite-alphabet inputs and instantaneous channel state information over a multiple-input multiple-output channel. We formulate the optimal precoder design as an optimization problem, in which the objective is to maximize the mutual information over the channel from the transmitter to the information receiver under the constraints of transmit power and harvested energy threshold. The formulated problem is NP-hard, so a global optimal solution cannot be found within the polynomial time. The main contributions of this paper are as follows: 1) By using its structure, the NP-hard problem is relaxed to a semidefinite programming problem. Then, a general solving framework for both co-located and separated receiver cases, based on the semidefinite relaxation (SDR) technique, is developed to achieve a near optimal precoder. 2) For the case of co-located receivers, we show that the optimal precoder design is a concave problem with respect to power allocation; then, a specific algorithm for co-located receivers is proposed. Compared with the general SDR-based method, the specific algorithm for co-located receivers exhibits almost the same performance but much lower complexity. 3) The performance of several practical co-located receiver designs is analyzed in SWIPT systems with finite-alphabet inputs. Finally, we provide simulation results to show the efficacy of the proposed algorithms.
- Subjects :
- Semidefinite programming
Engineering
Mathematical optimization
Optimization problem
Computer Networks and Communications
business.industry
MIMO
Aerospace Engineering
020206 networking & telecommunications
020302 automobile design & engineering
02 engineering and technology
Transmitter power output
0203 mechanical engineering
Channel state information
Control theory
Automotive Engineering
0202 electrical engineering, electronic engineering, information engineering
Algorithm design
Electrical and Electronic Engineering
business
Time complexity
Computer Science::Information Theory
Communication channel
Subjects
Details
- ISSN :
- 19399359 and 00189545
- Volume :
- 66
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Vehicular Technology
- Accession number :
- edsair.doi...........c7a7c5f630d187f71cb7b26b762da2e6