Optimal Power Allocation in Spatial Modulation Systems

Shi, Yabo, Ma, Meng, Yang, Yuli and Jiao, Bingli (2017) Optimal Power Allocation in Spatial Modulation Systems. IEEE Transactions on Wireless Communications, 16 (3). pp. 1646-1655. ISSN 1536-1276

Full content URL: https://ieeexplore.ieee.org/document/7812789

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In spatial modulation (SM) systems, when channel state information is available at the transmitter, adaptive power allocation can be exploited to enhance the SM performance. In this paper, optimal power allocation in SM systems is considered from an information-theoretical view. First, as there is no closed-form expression of the SM capacity, the instantaneous mutual information is formulated in an analytic form for SM systems with two transmit antennas. Then, two power-allocation algorithms are proposed to maximize the SM mutual information. One is a sub-optimal power-allocation algorithm that is established in closed form to maximize the upper bound of SM mutual information. The other is an iterative algorithm for optimal power allocation that is proposed to achieve the maximum mutual information of SM systems while dramatically reducing the operational complexity compared with global computer searching. To evaluate the performance of the proposed power-allocation algorithms, numerical and simulation results are reported in terms of outage capacity and ergodic capacity, which demonstrates that the proposed power-allocation algorithms significantly improve the SM performance, compared with conventional equal-power allocation.

Keywords:Spatial modulation, Mutual information, Power allocation, Capacity maximization
Subjects:H Engineering > H610 Electronic Engineering
H Engineering > H640 Communications Engineering
Divisions:College of Science > School of Engineering
ID Code:39403
Deposited On:10 Jan 2020 15:05

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