scholarly journals Compressed-Sensing Assisted Spatial Multiplexing Aided Spatial Modulation

2018 ◽  
Vol 17 (2) ◽  
pp. 794-807 ◽  
Author(s):  
Lixia Xiao ◽  
Yue Xiao ◽  
Chao Xu ◽  
Xia Lei ◽  
Ping Yang ◽  
...  
Keyword(s):  
Compressed Sensing ◽  
Spatial Multiplexing ◽  
Spatial Modulation

A Low-Complexity High-Rate Spatial Multiplexing Aided Generalized Spatial Modulation Scheme

2021 ◽  
Author(s):  
Yen-Ming Chen ◽  
Kuo-Chun Lin ◽  
Yao-Hsien Peng ◽  
Aswin Balaji ◽  
Chih-Peng Li
Keyword(s):  
Low Complexity ◽  
Spatial Multiplexing ◽  
Spatial Modulation ◽  
High Rate ◽  
Modulation Scheme

scholarly journals Performance Analysis of Optical Spatial Modulation in Atmospheric Turbulence Channel †

Photonics ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 53 ◽  
Author(s):  
Hammed Olanrewaju ◽  
John Thompson ◽  
Wasiu Popoola
Keyword(s):  
Atmospheric Turbulence ◽  
Symbol Error Rate ◽  
Spatial Multiplexing ◽  
Spatial Modulation ◽  
Closed Form Expression ◽  
Channel Fading ◽  
Free Space Optical ◽  
Error Performance ◽  
Receive Diversity ◽  
Space Optical Communication

In this paper, spatial pulse position modulation (SPPM) is used as a case study to investigate the performance of the optical spatial modulation (SM) technique in outdoor atmospheric turbulence (AT). A closed-form expression for the upper bound on the asymptotic symbol error rate (SER) of SPPM in AT is derived and validated by closely-matching simulation results. The error performance is evaluated in weak to strong AT conditions. As the AT strength increases from weak to strong, the channel fading coefficients become more dispersed and differentiable. Thus, a better error performance is observed under moderate-to-strong AT compared to weak AT. The performance in weak AT can be improved by applying unequal power allocation to make free-space optical communication (FSO) links more distinguishable at the receiver. Receive diversity is considered to mitigate irradiance fluctuation and improve the robustness of the system to turbulence-induced channel fading. The diversity order is computed as half of the number of detectors. Performance comparisons, in terms of energy and spectral efficiencies, are drawn between the SPPM scheme and conventional MIMO schemes such as repetition coding and spatial multiplexing.

scholarly journals Normalized Structured Compressed Sensing Based Signal Detection in Spatial Modulation 3D-MIMO Systems

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Wei Ren ◽  
Guan Gui ◽  
Fei Li
Keyword(s):  
Compressed Sensing ◽  
Signal Detection ◽  
Communication Systems ◽  
Mimo Systems ◽  
Mimo System ◽  
Minimum Mean Square Error ◽  
Iteration Process ◽  
High Energy ◽  
Spatial Modulation ◽  
3D Mimo

Signal detection is one of the fundamental problems in three-dimensional multiple-input multiple-output (3D-MIMO) wireless communication systems. This paper addresses a signal detection problem in 3D-MIMO system, in which spatial modulation (SM) transmission scheme is considered due to its advantages of low complexity and high-energy efficiency. SM based signal transmission typically results in the block-sparse structure in received signals. Hence, structured compressed sensing (SCS) based signal detection is proposed to exploit the inherent block sparsity information in the received signal for the uplink (UL). Moreover, normalization preprocessing is considered before iteration process with the purpose of preventing the noise from being overamplified by the column vector with inadequately large elements. Simulation results are provided to show the stable and reliable performance of the proposed algorithm under both Gaussian and non-Gaussian noise, in comparison with methods such as compressed sensing based detectors, minimum mean square error (MMSE), and zero forcing (ZF).

Optimal Power Allocation in SM-OFDM System Based on Visible Light Communications

2014 ◽  
Vol 513-517 ◽  
pp. 3429-3433
Author(s):  
Hong Shuang Fu ◽  
Yi Jun Zhu ◽  
Wen Bing Cai
Keyword(s):  
Visible Light ◽  
Power Allocation ◽  
Optimal Allocation ◽  
Symbol Error Rate ◽  
Spatial Multiplexing ◽  
Spatial Modulation ◽  
Visible Light Communications ◽  
Ofdm System ◽  
Optimal Power ◽  
Data Rates

Spatial Modulation is a kind of spatial multiplexing schemes conveying information by the location of transmit antennas and spatial modulation (SM) along with OFDM can be applied to visible light communications for higher data rates. The closed form of symbol error rate (SER) in optical SM-OFDM communication system is derived in this paper. SER is a convex function of power allocation coefficients, therefore there exist optimal allocation coefficients minimizing SER. The optimal allocation coefficients are derived for different channels and numbers of transmit antennas. Analytical results are validated by Monte Carlo simulation results and these results show that a significant SER improvement is obtained by using the power allocation. In addition, the optimal allocation coefficients are affected by the channel and number of transmitters.

scholarly journals OFDM-Based Generalized Optical MIMO

2020 ◽  
Author(s):  
Chen Chen ◽  
Xin Zhong ◽  
Shu Fu ◽  
Xin Jian ◽  
Min Liu ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Time Domain ◽  
Orthogonal Frequency Division Multiplexing ◽  
Direct Detection ◽  
Multiple Input Multiple Output ◽  
Detection Algorithm ◽  
Spatial Multiplexing ◽  
Spatial Modulation ◽  
Input Multiple Output ◽  
The Time Domain

<p>The combination of multiple-input multiple-output (MIMO) transmission and orthogonal frequency division multiplexing (OFDM) modulation has been shown to be an effective way to substantially enhance the capacity of bandlimited optical wireless communication (OWC) systems. In this paper, we propose four OFDM-based generalized optical MIMO techniques for intensity modulation/direct detection (IM/DD) OWC systems, including OFDM-based frequency-domain generalized spatial modulation (FD-GSM), frequency-domain generalized spatial multiplexing (FD-GSMP), time-domain generalized spatial modulation (TD-GSM) and time-domain generalized spatial multiplexing (TD-GSMP). For OFDM-based FD-GSM and FDGSMP, spatial mapping is performed in the frequency domain, while it is carried out in the time domain for OFDM-based TDGSM and TD-GSMP. To efficiently estimate both spatial and constellation symbols in each OFDM-based generalized optical MIMO technique, a corresponding maximum-likelihood (ML) detection algorithm is designed. Extensive simulations are conducted to evaluate and compare the performance of the proposed four OFDM-based generalized optical MIMO techniques in a typical indoor environment. Simulation results demonstrate the superiority of OFDM-based TD-GSM and TD-GSMP for various spectral efficiencies of 4, 5 and 6 bits/s/Hz, when a relatively high secondary direct current (DC) bias is adopted.</p>

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