HybridConcatenated Coding Scheme for MIMO Systems

Oluwafemi, Ilesanmi B.

doi:10.11591/ijece.v5i3.pp464-476

Cited by 5 publications

(5 citation statements)

References 27 publications

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“…Depending on the availability of channel state information (CSI) on the relay nodes, several strategies for wireless sensor networks have been recently suggested to generalize and improve cooperative diversity strategies [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Some strategies are based on unrealistic assumptions such as perfect CSI available at all nodes [15].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Differential Beamforming in Decentralized Networks

Alabed

2018

IJECE

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This paper proposes and analyzes a novel differential distributed beamforming strategy for decentralized two-way relay networks. In our strategy, the phases of the received signals at all relays are synchronized without requiring channel feedback or training symbols. Bit error rate (BER) expressions of the proposed strategy are provided for coherent and differential M-PSK modulation. Upper bounds, lower bounds, and simple approximations of the BER are also derived. Based on the theoretical and simulated BER performance, the proposed strategy offers a high system performance and low decoding complexity and delay without requiring channel state information at any transmitting or receiving antenna. Furthermore, the simple approximation of the BER upper bound shows that the proposed strategy enjoys the full diversity gain which is equal to the number of transmitting antennas.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Differential Beamforming in Decentralized Networks

Alabed

2018

IJECE

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“…of carriers as well as no. of operators will increase on same roof top, this power will increase several times [10]. Experimentally, it has been observed that radiation density will be much lower away from the main beam direction.…”

Section: Power Density Of Bts For Different Source Distancementioning

confidence: 97%

Assessment of Radiation Density of Cell Phone Tower for Epidemiological Studies

Singh

Setia

Seth

et al. 2023

Advances in Transdisciplinary Engineering

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In this paper the state of art study is being done to create awareness and evaluate the level of surface power density emitted from base transceiver (BTS) at different horizontal distances and frequencies, in Navi Mumbai region. A NARDA SRM-3006 kit was used to measure the maximum surface power density in broadband region. The highest power level was found within 40–50m from the tower, ≈ 427.00 mW/m2 (frequency band 26.00MHz to 3.00 GHz). This power level was more than the limit of exposure level recommended by International Commission on Non-Ionizing Radiation Protection (ICNIRP). However, the distance from the BTS Antenna more than 50m and at same frequency, the observed exposure levels were below the ICNIRP limit but more than the limit values, recommended by some countries (≤ 1mW/m2) and researchers. The power density ∼ 24.3 mW/m2 (maximum peak) was found at 350m distance from the tower. The power dependencies algorithm on frequency has been verified and it is observed that power level reduced by ∼ 40% to ∼96% , by reducing the frequency from 2000.00MHz to 500.00 MHz, respectively at fixed distance from the BTS. The results of this study informed that the surface power density levels significantly varied with distance, direction, characteristics impedance of medium and frequency. Therefore, these facts need to be incorporated for determining the public health guideline regarding cell phone towers. Now, this study can further be utilized in future for auditing the power density radiated from BTS for epidemiological studies.

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“…In this paper, hybrid concatenated super-orthogonal space-time trellis codes (SOSTTC) applying iterative translating are proposed for level fading channels. The proposed topologies are appeared to perform superior to anything existing connected plans with aconstituent code of convolutional and space-time codes in writing [14]. This paper explains the concept of correlation among the carrier signals and sub channels.…”

Section: Introductionmentioning

confidence: 94%

BER analysis of concatenated levels of encoding in GFDM system using labview

Telagam¹,

Lakshmi²,

Kandasamy³

2019

IJEECS

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<p>All the devices are interconnected each other in digital form, for different applications the input data is encoded for error correcting and detecting purpose. The paper describes the transmission of QAM signals with two level encoded stages, i.e. convolutional and hamming coded GFDM system with 256-point IFFT at transmitter and FFT at the receiver using LABVIEW software. GFDM is a non-orthogonal, digital multicarrier transmission scheme which digitally implements the classical filter bank approach. GFDM transmits a block of frame composed by M time slots with K subcarriers. The higher order QAM is used because of transmitting more data but is less reliable when compared to lower order QAM. Based on GFDM specifications for the IEEE 802.11, latest 5G physical layer standards, the coding is provided by ½ rate encoder at the input side, and Maximum Likelihood decoder at the receiver side is used. The standard convolution code (7, [171, 133]), is used as encoder for the GFDM system. The GFDM complex values are displayed in the front panel, along with FFT and power spectrum is plotted for GFDM signal. The array of input bits and output bits are shown with green colour LED’s. The van de Beek algorithm is used at the receiver for maximum likelihood detection acts as convolutional decoder of GFDM signal. Next the signal is subjected to remove cyclic prefix and zero padding and applied to channel estimation algorithm. The un-equalized data and equalized data graph is shown in the front panel, before and after channel estimation VI. With BER VI available in the LABVIEW the data is normalized and its response is plotted with respect to SNR. BER values for different levels of encoders have shown in table for SNR values. This paper concludes the 32.91% improvement in BER for two levels of concatenated codes.Thus the GFDM signal outperforms the OFDM signal interms of BER for series levels of coding using labVIEW software.</p>

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HybridConcatenated Coding Scheme for MIMO Systems

Cited by 5 publications

References 27 publications

Performance Analysis of Differential Beamforming in Decentralized Networks

Performance Analysis of Differential Beamforming in Decentralized Networks

Assessment of Radiation Density of Cell Phone Tower for Epidemiological Studies

BER analysis of concatenated levels of encoding in GFDM system using labview

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