Generalized Complex Quadrature Spatial Modulation

Mohaisen, Manar

doi:10.1155/2019/3137927

Cited by 9 publications

(12 citation statements)

References 22 publications

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“…The receiver; due to a fact that one (or a set of) transmit antenna (s) are active in one transmit period, will try to detect the received bits. The complexity of achieving this detection (or prediction) depeds on many factors related to the detection method itself, channel behavior, constellation order, channel estimation accuracy, and number of bits conveyed in selecting transmit antennas (as the number of spatial bits increase, complexity increases [23,24]).…”

Section: Miso-ofdm-sm System Modelmentioning

confidence: 99%

A simplified spatial Modulation MISO-OFDM scheme

Al-Doori

Al-Hemiary

2020

TELKOMNIKA

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Index modulation is one of the promising techniques for future communications systems due to many improvement over the classical orthogonal frequency division multiplexing systems such as single RF chain, increased throughput for the same modulation order, achieved tradeoff between the efficiencies of the power and the spectral, and elimination of inter-channel interference. Many forms of index modulation researches exist where symbols are conveyed in antennas, subcarriers, time slots, and the space-time matrix. Spatial modulation is one member of index modulation family where symbols are conveyed in activating transmit/receive antennas. In this paper, a modification to a standard multiple input single output scheme by integrating spatial modulation using simplified mathematical procedure is achieved. In the transmitter side, data and activation symbols are distributed simultaneously using mathematical module and floor functions. At the receiver, a simplified maximum likelihood detector is used to obtain transmitted pair of symbols. To verify this, MATLAB simulink is used to simulate a downlink system where spatial modulation is applied to a base station. Results for different transmit antenna number and modulation order are obtained in the form of bit error rate versus signal to noise ratio.

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Section: Miso-ofdm-sm System Modelmentioning

confidence: 99%

A simplified spatial Modulation MISO-OFDM scheme

Al-Doori

Al-Hemiary

2020

TELKOMNIKA

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“…It improves the SE by transmitting two amplitude/phase modulated symbols drawn from two different constellation sets at each channel use, using unique combinations of generalized I domain antennas and Q domain antennas. The two symbols could be transmitted from the same antenna at one point, and thus the total modulation set at the transmitter becomes the Minkowski sum of the original two constellation sets 12 . Therefore, compared to C-SM and C-QSM, this leads to an increase in the size of the modulation set and a decrease in the minimum distance between transmitted symbols at the transmitter of GCQSM systems, which in turn results in the degradation of the EP of the GCQSM scheme 13 .…”

Section: Introductionmentioning

confidence: 99%

“…Cogen et al 17 , also solved the error floor degradation of the EP of QSM systems by rotating the H-QAM symbols. Also, in 12 , Mohaisen et al investigated the rotation of symbols in GCQSM systems which also led to an improvement in the EP of GCQSM systems. In Naidoo et al 14 , and Singya et al 15 , the EP of SM systems was also found to depend on the M-MED between two neighbouring constellation points and the average symbol energy.…”

Section: Introductionmentioning

confidence: 99%

Error performance analysis of generalized quadrature spatial modulation using H-8QAM

Sibanda

Pillay

2022

Sci Rep

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Motivated to enhance the error performance (EP) of generalised complex quadrature spatial modulation (GCQSM) systems, this study proposes a scheme that builds on GCQSM and uses hexagonal quadrature amplitude modulation (H-QAM) constellations which have the advantages of a maximised Euclidean distance with relatively low peak-to-average power ratio, compared to conventional QAM (C-QAM) systems. This in turn, leads to an enhancement of the EP of GCQSM schemes. The proposed scheme utilises a rotated hexagonal 8QAM (H-8QAM) set. Thus, the proposed scheme is herein named; Generalised QSM using H-8QAM (GQSM-H-8QAM). In this study, the EP of the proposed GQSM-H-8QAM scheme is investigated over Rayleigh frequency flat-fading channels with additive white Gaussian noise. Additionally, a theoretical average bit error probability (ABEP) expression of the GQSM-H-8QAM scheme is formulated and validated using Monte Carlo simulations. Compared to simulation results, the ABEP proves to be increasingly tight at high signal-to-noise ratio values. Obtained simulation results also show an improvement in the EP of the GQSM-H-8QAM scheme over various SM schemes like GCQSM, C-QSM and conventional-generalized spatial modulation (C-GSM), at the same spectral efficiency (SE). An improvement in the EP of 0.61 dB with SE of 8 bits/s/Hz is seen in $$4\times 4$$ 4 × 4 GQSM-H-8QAM over $$4\times 4$$ 4 × 4 GCQSM using C-8QAM, 2.58 dB over $$4\times 4$$ 4 × 4 C-QSM-C-64QAM and a gain of 4.85 dB over $$4\times 4$$ 4 × 4 C-GSM-C-64QAM.

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“…The constellation design of this system is investigated in Reference [ 25 ]. Another approach used to avoid the symbols’ overlapping and to reduce the number of transmit antennas by using antenna combinations is proposed in Reference [ 26 ]. Improved QSM (IQSM) exploits the in-phase and quadrature spatial dimensions to transmit the real and imaginary parts of two signal symbols, respectively, using combinations of two antennas [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Constellation Design for the Parallel Quadrature Spatial Modulation

Mohaisen

Holoubi

Abuhmed

2020

Entropy

Self Cite

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Spatial modulation (SM) is a multiple-input multiple-output (MIMO) technique that achieves a MIMO capacity by conveying information through antenna indices, while keeping the transmitter as simple as that of a single-input system. Quadrature SM (QSM) expands the spatial dimension of the SM into in-phase and quadrature dimensions, which are used to transmit the real and imaginary parts of a signal symbol, respectively. A parallel QSM (PQSM) was recently proposed to achieve more gain in the spectral efficiency. In PQSM, transmit antennas are split into parallel groups, where QSM is performed independently in each group using the same signal symbol. In this paper, we analytically model the asymptotic pairwise error probability of the PQSM. Accordingly, the constellation design for the PQSM is formulated as an optimization problem of the sum of multivariate functions. We provide the proposed constellations for several values of constellation size, number of transmit antennas, and number of receive antennas. The simulation results show that the proposed constellation outperforms the phase-shift keying (PSK) constellation by more than 10 dB and outperforms the quadrature-amplitude modulation (QAM) schemes by approximately 5 dB for large constellations and number of transmit antennas.

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Generalized Complex Quadrature Spatial Modulation

Cited by 9 publications

References 22 publications

A simplified spatial Modulation MISO-OFDM scheme

A simplified spatial Modulation MISO-OFDM scheme

Error performance analysis of generalized quadrature spatial modulation using H-8QAM

Performance Analysis and Constellation Design for the Parallel Quadrature Spatial Modulation

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