RIS-Aided LDM System: A New Prototype in Broadcasting System

Zhang, Yizhe; He, Wen; He, Dazhi; Xu, Yin; Guan, Yunfeng; Zhang, Wenjun

doi:10.1109/tbc.2022.3217670

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…Layer division multiplexing (LDM) [1], a power-based non-orthogonal multiple access (NOMA) technology, is gaining popularity in a variety of wireless applications to deliver robust high-definition services [2][3][4]. Recently, the advanced television systems committee (ATSC) 3.0 standard applied LDM for broadcasting systems [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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

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Section: Introductionmentioning

confidence: 99%

“…LDM has been combined with several technologies [4,12]. Among these, LDM that makes use of spatial modulation (SM) has shown promise in comparison to conventional LDM [13][14][15][16][17] due to its potential for more SE, lower energy consumption, and easier installation.…”

Section: Introductionmentioning

confidence: 99%