Conference Papers

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Subject: search.filters.subject.Multiple Input Multiple Output (MIMO)

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    Performance of Spatial-Modulation and spatial-multiplexing systems over Weibull fading channel
    (Institute of Electrical and Electronics Engineers Inc., 2016) G.D., G.D.; Koila, S.; Neha, N.; Sripati, U.
    In this paper we have analyzed, quantified and compared the performance of variants of spatial modulation (SM) and spatial multiplexing (SMX) techniques over the GSM/3G frequency band. SMX systems use all the available transmit antennas for multiplexing the data symbols and hence achieve greater spectral efficiency. An SM system uses only one antenna at any given instant and achieves a reduction in the average energy consumption due to single RF chain activation. Some variants of (Spatial modulation (SM) namely Extended Spatial Modulation(EXSM), Enhanced Spatial Modulation (ESM) and Quadrature Spatial Modulation (QSM) use one or more antennas to provide a trade-off between spectral efficiency and energy efficiency. In battery operated devices, apart from increase in the spectral efficiency, energy efficiency also becomes a critical parameter of concern. This paper shows that EXSM provides superior BER performance in comparison to SMX systems. Thus, these schemes can be advantageously deployed in portable devices used in Mobile Wireless Communication Systems. In [9] it has been demonstrated that the Weibull distribution is a good fit to describe the multipath fading phenomenon in the GSM/3G band. In this paper, we have evaluated the performance of 2×2 and 2×4 SM, EXSM, ESM, SMX and QSM. We have also evaluated the performance of 3×3 SMX and EXSM systems. Our results indicate that a variant of SM specifically EXSM outperforms SMX systems by ∼4.7 dB in 2×2, 2×4 systems and ∼7 dB for 3×3 systems in a deep fading environment (Weibull with shape parameter=0.5). © 2015 IEEE.
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    Design and Analysis of Wide-Band Circularly Polarized 2×2 Mimo Antenna for Sub-6 Ghz 5G Communication
    (Institute of Electrical and Electronics Engineers Inc., 2025) Soniya, S.S.; Yashaswini, H.M.; Bhavyashree, K.V.; Deepika, P.N.; Tharehalli Rajanna, P.K.T.; Kandasamy, K.
    This work presents a 2×2 circularly polarized (CP) MIMO microstrip antenna. The square slot antenna's corner is perturbed, resulting in two degenerative modes necessary for CP achievement. To achieve MIMO features, the corner perturbed slot antenna is placed in a 2×2 consecutive configuration. The slot antenna is fed by the microstrip line. The two degenerated modes of single slot antenna will provide wide axial ratio bandwidth of 29.3%. The suggested MIMO antenna provides improved impedance bandwidth (48.21%), axial ratio bandwidth, gain, and port isolation. The antenna radiates in the broadside direction and has higher cross polarization levels than copolarization values. Total active reflection coefficient (TARC), Envelop correlation coefficient (ECC) and diversity gain (DG) of the proposed design are evaluated. The proposed design is well suitable in sub-6 GHz 5G application. © 2025 IEEE.