Signal space diversity for spatial multiplexing

Krishna, G.; Srinivas, Kothapalli Venkata; Bhashyam, Srikrishna; Koilpillai, R. David

doi:10.1109/pimrc.2008.4699616

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…where E η denotes the η-th row of matrix E. Additionally, in (26), s is a 2DU-dimensional column vector given by…”

Section: B Scenario U >mentioning

confidence: 99%

“…In addition, the system BER is evaluated just by simulations. Moreover, in [26], the performance of SSD for spatial multiplexing is assessed employing a metric named as diversity multiplexing trade-off (DMT) [27], which is the ratio between the diversity order and the multiplexing gain. In [28], [29], SSD is incorporated into a MIMO system employing phase-shiftkeying (PSK) modulation and transmit antenna selection (TAS).…”

Section: Introductionmentioning

confidence: 99%

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Enabling Signal Space Diversity for MU-MIMO/OFDMA Cellular Systems That Employ Frequency Diversity

et al. 2019

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Signal space diversity (SSD) is a technique to obtain diversity without loss in spectral efficiency. Despite this, SSD has been minimally studied in multiuser scenarios. In this paper, SSD is operated in the uplink of orthogonal frequency division multiple access (OFDMA) cellular systems that exploit frequency diversity, use the optimum maximum-likelihood detector (MLD) and employ antenna arrays at the receivers. Thus, a multiuser multiple-input-multiple-output (MU-MIMO) system that works in presence of own-cell and co-cell interference (CCI) is taken into account. In order to diminish CCI, fractional frequency reuse (FFR) is used in the cellular system. For a feasible MLD implementation, a matrix structure of the received signals is obtained in order to use the sphere decoder algorithm. An exact closed-form expression to calculate the pairwise error probability between two multidimensional symbols is derived. From this, a bit error rate (BER) upper bound is found for single user scenarios. This BER expression is an accurate lower bound for high diversity orders in multiuser scenarios. The BER asymptotic analysis shows that our approach maintains the SSD multidimensional diversity, the spatial diversity of MIMO and the frequency diversity. This allows to overload the system by minimizing the BER and increasing the spectral efficiency, simultaneously. INDEX TERMSDiversity methods, MIMO, mobile communication, multiple access interference, OFDM. HENRY CARVAJAL MORA received the B.Sc. degree (Hons.) in electronics and telecommunications engineering from Armed Forces University-ESPE, Sangolquí, Ecuador, in 2009, and the M.Sc. and Ph.D. degrees in electrical engineering from the School of Electrical and Computer Engineering (FEEC), University of Campinas (UNICAMP), Brazil, in 2014 and 2018, respectively. In 2018, he was the Director of technology transfer area with the Education, Science, Technology, and Innovation Secretariat (SENESCYT), Ecuador. He is currently a Full Professor with the Universidad de Las Américas (UDLA), Quito, Ecuador. His research interests include diversity-combining systems, multiple access systems, multiuser detection, MIMO systems, and 5G communications systems. NATHALY OROZCO G. received the Electronic and Telecommunications Engineering degree from Armed Forces University-ESPE, Sangolquí, Ecuador, in 2011, and the M.Sc. and Ph.D. degrees in electrical engineering from the University of Campinas (UNICAMP), Brazil, in 2014 and 2018, respectively. She is currently a Full Professor with the Universidad de Las Américas (UDLA), Quito, Ecuador. Her research interests include digital communications with a specific emphasis on multiple access techniques, fading channels, MIMO, cognitive opportunistic wireless systems, and 5G technologies. PAULO CHILIGUANO T. received the B.Sc. degree in electrical engineering and telecommunications from Armed Forces University-ESPE, Sangolquí, Ecuador, in 2009, and the M.Sc. degree in sound and music computing from the School of Electronic Engineering and Computer Sci...

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“…where E η denotes the η-th row of matrix E. Additionally, in (26), s is a 2DU-dimensional column vector given by…”

Section: B Scenario U >mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enabling Signal Space Diversity for MU-MIMO/OFDMA Cellular Systems That Employ Frequency Diversity

et al. 2019

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“…Spatial multiplexing based MIMO system is considered in [13], while the authors of [19] explored PWC to achieve transmit diversity and enhance the error performance of spatial modulation based MIMO systems. The concept of PWC is also explored in [20] to improve the error performance of MIMO transmission in combination with zero-forcing beamforming, while [21] considered co-ordinate interleaving of symbols over eigenchannels of MIMO systems for diversity-multiplexing trade-off. In [22], the idea of rotational modulation and component interleaver similar to PWC is employed to obtain modulation diversity gain in MIMO-OFDM scheme for wireless local area networks (WLAN) technology.…”

Section: Introductionmentioning

confidence: 99%

Pairwise Coding for MIMO-OFDM Visible Light Communication

Olanrewaju

Thompson

Popoola

2020

IEEE Trans. Wireless Commun.

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This work proposes a dual pairwise coding (DPWC) technique for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) based visible light communication (VLC) systems. DPWC is a technique designed to mitigate the signal-to-noise ratio (SNR) imbalance created in the received information symbols due to the light emitting diodes' bandwidth limitations and the strong correlation of typical indoor VLC MIMO channels. With singular value decomposition precoding, the MIMO VLC channel is decomposed into independent parallel sub-channels. The DPWC technique is then applied to further improve the system performance by pairing and interleaving OFDM subcarriers and MIMO sub-channels with imbalanced SNR. The error performance of the proposed DPWC technique is investigated in detail via simulation and experimental demonstration. Its effectiveness with different degrees of bandwidth-limitation (data rate) and channel correlation is presented, and the results are compared with other variants of the pairwise coding technique. DPWC provides performance improvement with a significant reduction in the SNR required to achieve a specific bit error rate (BER).

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New Strategies for Coded Modulation Diversity over Rayleigh Fading Channels

Shi¹,

Zhang³

2010

2010 IEEE Wireless Communication and Networking Conference

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Signal space diversity for spatial multiplexing

Cited by 3 publications

References 10 publications

Enabling Signal Space Diversity for MU-MIMO/OFDMA Cellular Systems That Employ Frequency Diversity

Enabling Signal Space Diversity for MU-MIMO/OFDMA Cellular Systems That Employ Frequency Diversity

Pairwise Coding for MIMO-OFDM Visible Light Communication

New Strategies for Coded Modulation Diversity over Rayleigh Fading Channels

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