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RIS-Aided Receive Generalized Spatial Modulation Design with Reflecting Modulation

Xinghao Guo, Yin Xu, Hanjiang Hong, De Mi, Ruiqi Liu, Dazhi He, Wenjun Zhang, Yi-yan Wu

TL;DR

The paper addresses limited receive-antenna scenarios that constrain GSM throughput and proposes RIS-RGSM to boost spectral efficiency by pairing GSM with a reconfigurable intelligent surface. It introduces a diversity and a novel MUX scheme, derives ML detection and a BER bound via PEP and the MGF, and shows through simulations that the RIS-RGSM MUX achieves substantial BER gains over the diversity variant at the same rate. APSK-based MUX offers improved performance at higher modulation orders while PSK is favorable at lower orders; RIS-RGSM also outperforms RIS-RGSSK when $N_R$ is constrained. Overall, RIS-RGSM provides a practical path to higher rates with manageable complexity and extendibility to various constellations and RIS configurations.

Abstract

Spatial modulation (SM) transmits additional information bits by the selection of antennas. Generalized spatial modulation (GSM), as an advanced type of SM, can be divided into diversity and multiplexing (MUX) schemes according to the symbols carried on the selected antennas are identical or different. Recently, reconfigurable intelligent surface (RIS) assisted SM exhibits better reception performance compared to conventional SM. To overcome the limitations of SM, this paper combines GSM with RIS and proposes the RIS-aided receive generalized spatial modulation (RIS-RGSM) scheme. The RIS-RGSM diversity scheme is realized via a simple improvement based on the state-of-the-art scheme. To further increase the transmission rate, a novel RIS-RGSM MUX scheme is proposed, where the reflection phase shifts and on/off states of RIS elements are configured to achieve bit mapping. The theoretical bit error rate (BER) of the proposed scheme is derived and agrees well with the simulation results. Numerical simulations show that the RIS-RGSM MUX scheme has better BER performance than the diversity scheme. The proposed scheme can significantly increase the transmission rate and maintain good performance compared to the existing scheme under a limited number of antennas.

RIS-Aided Receive Generalized Spatial Modulation Design with Reflecting Modulation

TL;DR

The paper addresses limited receive-antenna scenarios that constrain GSM throughput and proposes RIS-RGSM to boost spectral efficiency by pairing GSM with a reconfigurable intelligent surface. It introduces a diversity and a novel MUX scheme, derives ML detection and a BER bound via PEP and the MGF, and shows through simulations that the RIS-RGSM MUX achieves substantial BER gains over the diversity variant at the same rate. APSK-based MUX offers improved performance at higher modulation orders while PSK is favorable at lower orders; RIS-RGSM also outperforms RIS-RGSSK when is constrained. Overall, RIS-RGSM provides a practical path to higher rates with manageable complexity and extendibility to various constellations and RIS configurations.

Abstract

Spatial modulation (SM) transmits additional information bits by the selection of antennas. Generalized spatial modulation (GSM), as an advanced type of SM, can be divided into diversity and multiplexing (MUX) schemes according to the symbols carried on the selected antennas are identical or different. Recently, reconfigurable intelligent surface (RIS) assisted SM exhibits better reception performance compared to conventional SM. To overcome the limitations of SM, this paper combines GSM with RIS and proposes the RIS-aided receive generalized spatial modulation (RIS-RGSM) scheme. The RIS-RGSM diversity scheme is realized via a simple improvement based on the state-of-the-art scheme. To further increase the transmission rate, a novel RIS-RGSM MUX scheme is proposed, where the reflection phase shifts and on/off states of RIS elements are configured to achieve bit mapping. The theoretical bit error rate (BER) of the proposed scheme is derived and agrees well with the simulation results. Numerical simulations show that the RIS-RGSM MUX scheme has better BER performance than the diversity scheme. The proposed scheme can significantly increase the transmission rate and maintain good performance compared to the existing scheme under a limited number of antennas.
Paper Structure (14 sections, 24 equations, 4 figures, 1 table)

This paper contains 14 sections, 24 equations, 4 figures, 1 table.

Table of Contents

  1. Introduction
  2. RIS-Aided Receive Generalized Spatial Modulation
  3. System Model
  4. Transmission Schemes
  5. RIS-RGSM diversity scheme
  6. RIS-RGSM MUX scheme with PSK
  7. RIS-RGSM MUX scheme with APSK
  8. Detection Criterion
  9. Performance Analysis
  10. The $n$-th receive antenna does not belong to the combination $c$ and decoded correctly, i.e., $c_i\neq n$ and $\hat{c}_i\neq n$ for $i\in \{1,2,...,N_a\}$
  11. The $n$-th receive antenna is selected as the $l$-th antenna in $c$ and decoded correctly, i.e., $c_l=\hat{c}_l=n$
  12. The $n$-th receive antenna is selected as the $l$-th antenna in $c$ but decoded erroneously, the $m$-th receive antenna is decoded as the $l$-th antenna in $c$, i.e., $c_l=n$ but $\hat{c}_l=m$
  13. Simulation Results
  14. Conclusion

Figures (4)

  • Figure 1: Diagram of the RIS-RGSM system.
  • Figure 2: The BER results of the RIS-RGSM MUX scheme with 8APSK and $N_a=2$ for different conditions in $N$ and $N_R$.
  • Figure 3: The BER comparison results of RIS-RGSSK with different $N_R,N_a$, RIS-RGSM diversity and MUX with $N_R=5$, $N_a=2$ for $N=64$ and $R=$ (a) 7, (b) 9, (c) 11 bpcu.
  • Figure 4: The BER comparison results of the RIS-RGSM MUX with APSK and PSK for $N_R=5$, $N_a=2$ and $N=64$.