Space‐time block coded spatial modulation with labeling diversity

Self Cite

Summary Space‐time labeling diversity (STLD) has been shown to be an efficient technique for improving the bit error rate (BER) performance of an uncoded space‐time coded modulation system. In this paper, signal space diversity (SSD) is incorporated into the uncoded STLD system to further enhance the system BER performance. A tight closed‐form union bound on the BER of the proposed system is derived and is used to optimize the rotation angle of the SSD scheme. Simulation results are used to confirm the theoretical bound derived for the system. The results also show performance gains of approximately 2.0 dB at a BER of 10−6 and 1.6 dB at a BER 10−4 from incorporating SSD into the uncoded STLD system using 16QAM and 64QAM, respectively. Furthermore, a low complexity detection scheme based on orthogonal projection is formulated for the proposed scheme and, in comparison with the optimal maximum‐likelihood detector, is shown to result in a 56% and 95% reduction in computation complexity for the 16QAM and 64QAM versions of the proposed system, respectively.

Section: Introductionmentioning

confidence: 99%

SSD‐enhanced uncoded space‐time labeling diversity

Quazi

2018

Self Cite

“…We assume that the Rayleigh frequency‐flat fading channel is fully known at the receiver. For simulation purposes, the fading channel and noise parameters are defined in line with those presented in Section 2.3, while labeling maps for TC‐STLD are as illustrated in Govindasamy et al We evaluate the ABEP defined in to assess the tightness between analytical and simulation results. For comparison purposes, results of the STLD proposed by Xu et al are also included.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…The computational complexity of the conventional STLD ML detector has been formulated in the previous work and is expressed as

σ_{normalS normalT normalL normalD normal- normalM normalL} = N_{R} false(10 M^{2} + 4 false) - 2 M^{2} .

…”

Section: Comparison Of Computational Complexity Of the Detectorsmentioning

confidence: 99%

Trellis code‐aided high‐rate M‐QAM space‐time labeling diversity using a unitary expansion

Dlodlo

2018

Self Cite

Summary In this paper, we present a high‐rate M‐ary quadrature amplitude modulation (M‐QAM) space‐time labeling diversity (STLD) system that retains the robust error performance of the conventional STLD system. The high‐rate STLD is realised by expanding the conventional STLD via a unitary matrix transformation. Robust error performance of the high‐rate STLD is achieved by incorporating trellis coding into the mapping of additional bits to high‐rate codes. The comparison of spectral efficiency between the proposed trellis code‐aided high‐rate STLD (TC‐STLD) and the conventional STLD shows that TC‐STLD with 16‐QAM and 64‐QAM respectively achieves a 12.5% and 8.3% increase in spectral efficiency for each additional bit sent with the transmitted high‐rate codeword. Moreover, we derive an analytical bound to predict the average bit error probability performance of TC‐STLD over Rayleigh frequency‐flat fading channels. The analytical results are verified by Monte Carlo simulation results, which show that the derived analytical bounds closely predict the average bit error probability performance at high signal‐to‐noise ratios (SNR). Simulation results also show that TC‐STLD with 1 additional bit achieves an insignificant SNR gain of approximately 0.05 dB over the conventional STLD, while TC‐STLD with 2 additional bits achieves an SNR gain of approximately 0.12 dB.

“…The ML receiver computational complexity of SM, GSM, F‐GSM, DSM, QSM, GQSM, and F‐QSM is given by

{double-struckC}_{SM} = 8 N_{R x} 2^{γ},

{double-struckC}_{GSM} = 8 N_{R x} 2^{γ},

{double-struckC}_{F‐GSM} = 8 N_{R x} 2^{γ},

{double-struckC}_{DSM} = 12 N_{R x} 2^{γ},

{double-struckC}_{QSM} = 8 N_{R x} 2^{γ},

{double-struckC}_{GQSM} = 8 N_{R x} 2^{γ},

{double-struckC}_{F‐QSM} = 8 N_{R x} 2^{γ} .

…”

Section: Analysis Of the Receiver Computational Complexitymentioning

confidence: 99%

“…There exist a spectral efficient variant of GSM termed as multiple active spatial modulation (MA‐SM), where each active antenna transmits a different modulation symbol to further increase the spectral efficiency. However, detection of antenna indices and symbols becomes more difficult due to the transmission of multiple symbols and presence of ICI . Space time block coded ‐ spatial modulation (STBC‐SM) is proposed, where GSM scheme with only two active transmit antennas is combined with Alamouti space time block code (STBC) to enhance the ABER performance via trnamsit diversity .…”

Section: Introductionmentioning

confidence: 99%

Enhanced redesigned spatial modulation: Design and performance evaluation under correlated fading channels

Gudla

Kumaravelu

2020

Summary Spatial modulation techniques (SMTs) have emerged as promising multiple‐input and multiple‐output (MIMO) technology for fifth generation (5G) networks, which can achieve an appealing trade‐off between conflicting design objectives such as reliability, hardware cost, complexity, spectral efficiency, and energy efficiency. Most of the SMTs suffer from significant performance deterioration under correlated fading channels. In this paper, a novel spectral efficient SMT referred as enhanced redesigned spatial modulation (EReSM) is proposed, which is robust against adverse channel correlation effects. At any time instant, EReSM activates either one or two transmit antennas and employs a robust bits to antenna index mapping that ensures the selection of antenna subsets with maximum spatial separation to mitigate the effect of spatial correlation. EReSM also exploits phase rotation of transmitted symbols as an additional dimension to convey an extra information bit. The rotation angles used for bit mapping are optimized for various modulation schemes to maximize the minimum euclidean distance between the symbols. To analyze the performance, analytical upper bound expression for average bit error probability (ABEP) is derived for both uncorrelated and spatially correlated channel conditions. Monte Carlo simulation results substantiate the accuracy of the analytical results and also demonstrate that the proposed EReSM outperform conventional redesigned spatial modulation (ReSM) by at least 4 dB.