Browsing by Author "Neha, N."
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Item Adaptive receive-antenna selection technique for Spatial Modulation MIMO systems(2015) Neha, N.; Koila, S.; Prashantha, Kumar, H.; Shripathi, Acharya U.In this paper, we propose an adaptive receive antenna selection technique for Spatial Modulation (SM) MIMO systems. The proposed method is simple and uses channel state information (CSI) available at the receiver to choose the best subset of active receive antennas among the available Nr receive antennas. Simulation results show that SM MIMO system with the proposed receive antenna selection scheme provides a performance gain of approximately 5 dB over conventional SM system (SM MIMO system without antenna selection). The proposed scheme does not increase the RF chain requirement at the receiver and retains all the benefits of SM MIMO. � 2015 IEEE.Item Adaptive receive-antenna selection technique for Spatial Modulation MIMO systems(Institute of Electrical and Electronics Engineers Inc., 2015) Neha, N.; Koila, S.; Prashantha Kumar, H.; Sripati, U.In this paper, we propose an adaptive receive antenna selection technique for Spatial Modulation (SM) MIMO systems. The proposed method is simple and uses channel state information (CSI) available at the receiver to choose the best subset of active receive antennas among the available Nr receive antennas. Simulation results show that SM MIMO system with the proposed receive antenna selection scheme provides a performance gain of approximately 5 dB over conventional SM system (SM MIMO system without antenna selection). The proposed scheme does not increase the RF chain requirement at the receiver and retains all the benefits of SM MIMO. © 2015 IEEE.Item Performance of Spatial-Modulation and spatial-multiplexing systems over Weibull fading channel(2016) Goutham, Simha, G.D.; Koila, S.; Neha, N.; Shripathi, Acharya 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.Item 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.Item Redesigned Spatial Modulation for Spatially Correlated Fading Channels(Springer New York LLC barbara.b.bertram@gsk.com, 2017) G.D., G.S.; Koila, K.; Neha, N.; Raghavendra, R.; Sripati, U.In this paper, a new variant of Spatial Modulation (SM) Multiple-Input Multiple-Output (MIMO) transmission technique, designated as Redesigned Spatial Modulation (ReSM) has been proposed. In ReSM scheme, a dynamic mapping for antenna selection is adopted. This scheme employs both single antenna as well as double antenna combinations depending upon channel conditions to combat the effect of spatial correlation. When evaluated over spatially correlated channel conditions, for a fixed spectral efficiency and number of transmit antennas, ReSM exhibits performance improvement of at least 3 dB over all the conventional SM schemes including Trellis Coded Spatial Modulation (TCSM) scheme. Furthermore, a closed form expression for the upper bound on Pairwise Error Probability (PEP) for ReSM has been derived. This has been used to calculate the upper bound for the Average Bit Error Probability (ABEP) for spatially correlated channels. The results of Monte Carlo simulations are in good agreement with the predictions made by analytical results. The relative gains of all the comparison plots in the paper are specified at an ABER of 10?4. © 2017, Springer Science+Business Media, LLC.