Biased-Power Allocation and Shared-Antenna Selection Techniques for Spatial Modulation-Based Layer Division Multiplexing Systems

This study proposes two approaches for improving the effectiveness of spatial modulation integrated into layer division multiplexing (SM-LDM) in broadcasting systems: biased-power allocation (Bi-PA) and shared antenna selection (SAS). Even though different data rates are employed SM-LDM systems, Bi-PA enhances bit error rate (BER) fairness across layers. The ideal power ratios adaptively determined by balancing signal-to-interference plus noise with a preference lower (LL) that involves higher order. SAS alleviates complexity successive interference cancellation spectral energy efficiencies. Both LL upper (UL) share decision transmit using single antenna. UL carries space shift keying signal while entire is allocated LL. We analyze efficiency SAS-based system finite alphabet inputs. Numerical results demonstrate advantages proposed approaches. Compared to pre-assigned-PA (Pre-PA), shows nearly identical BERs both layers solves floor problem. sharing property common transmission yield significant BER reduction relative conventional SM-LDM. It provides gains ranging from 7 15 dB at equal 10−3, performance ranges slight gain minor loss. Furthermore, techniques enhance achievable sum-rate low intermediate signal-to-noise ratio values. They can achieve an improvement up bits less than one −0.5 dB. These findings show have considerable impact on enhancing fairness, performance, feasible making them promise broadcast designs.