Enhanced Receive Spatial Modulation Based on Power Allocation

Abstract

In this paper, we investigate the benefits of power allocation (PA) for multiple-input multiple-output (MIMO) receive spatial modulation (RSM) with both a total transmit power constraint (TTPC) and a per-antenna power constraint (PAPC). First, we derive optimal PA closed-form solutions that maximize the minimum distance d min between the received signal points for (N t × 2)-element RSM with arbitrary phase-shift keying schemes (where N t is the number of transmit antennas) subject to a TTPC. Based on the derived solutions and the error vector reduction (EVR) method, we propose a low-complexity iterative algorithm to identify PA parameters for high numbers of receive antennas (N r ≥ 2). Specifically, the EVR-based PA (EVR-PA) algorithm resembles its traditional exhaustive-search-based counterpart, but only exploits the receive distances of a few dominant error vectors to iteratively optimize the PA matrix. Then, a more strict yet practical PAPC is considered for PA in RSM-MIMO systems, and a welldesigned approximate convex optimization (ACO)-based iterative PA algorithm is proposed. Compared to EVR-PA, the ACO-based PA (ACO-PA) algorithm first formulates the PA problems with the PAPC in RSM into constrained quadratic program problems and then utilizes the powerful augmented Lagrangian multiplier to find their optimal solutions. Our simulation results show that the proposed EVR-PA-and ACO-PA-aided RSM schemes outperform the equal-power-allocated RSM-and PA-aided spatial multiplexing schemes.

A Secure Receive Spatial Modulation Scheme Based on Random Precoding

“…Note that, the antenna setting N a = 3 is not applicable to PSM schemes due to the rank-degenerate of the signal precoding matrix defined in (10). In addition, with the setting N a = N b = 4, the HS-PSM is reduced to the normal PSM scheme.…”

“…Recently, researchers devoted to spatial modulation have shown an increasing interest in receive spatial modulation (RSM) [9], [10], also known as precoding-aided spatial modulation (PSM) [11]- [13], which can convey partial information by appropriately selecting the receive antenna index in a The associate editor coordinating the review of this article and approving it for publication was Zheng Yan. receive spatial modulation manner.…”

Index Modulation for STAR-RIS Assisted NOMA System

“…Specifically, spatial modulation (SM) aided MIMOs was proposed in [22], where the active antenna index is exploited as an additional dimension to transmit information. To further enhance the SE and error performance, a set of SM-variants were investigated, such as generalized SM (GSM) [23], quadrature SM (QSM) [24], enhanced SM (ESM) [25], precoding SM (PSM) [26] and so on. More recently, IM has also been widely applied in highfrequency scenarios.…”

Power Allocation-Aided Enhanced SM-OFDM: Closed-Form Solutions and Experimental Results

“…Furthermore, [10] extended PA techniques to the case of generalized SM-MIMO (GSM-MIMO). In [11] and [12], PA techniques were further extended to a variant of SM, called receive SM (RSM), in order to strike different tradeoffs between the attainable BER and the imposed complexity.…”