A trilateral influence model for online shopping

Samaraweera, S. A. K. G.; Gamage, Narmada; Gallage, I. G.; Gunathilaka, D. D. T. M.; Fernando, Nimalika; Kasthurirathna, Dharshana

doi:10.1109/nctm.2017.7872831

Cited by 1 publication

(2 citation statements)

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“…First limitation is the scares affordable free bandwidth because the radio frequency (RF) spectrum is highly congested. The second limitation is the bandwidth over a wide range will increase the influence of nonlinearity and deformations effect on the transmitted signals [8]- [11]. Differnt approaches will invented to modulate the data that used narrower bandwidth with higher data rates, like the multi-carrier transmission (MC) or its modern version the orthogonal frequency division multiplexing (OFDM) [12], [13].…”

Section: Introductionmentioning

confidence: 99%

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BER estimation for STBC-MC-DS-CDMA-4 antennas system by varied wavelet-carriers features via AWGN-flat channels

Khadam,

Kadhim Jawad Alrubaie,

Jumah Al-Thahab

2024

Bulletin EEI

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This paper improves the bit error rate (BER) of the modern communication system by taking into account the effect of the wavelet shape and the number of carriers on the performance of the space time block code multi-carrier direct sequence code division multiple access (STBC-MC-DS-CDMA). Here the transmitter is moved with speeds 2 km/hr, 45 km/hr and 100 km/hr via Rayleigh flat fading channel. Here, 2 antennas are employed at the receiver to mitigate the multipath signal influence. The system’s orthogonal frequencies are generated using Haar, Daubechies 4, Symlets 4, Cohen-Daubechies-Feauveau 1.1 with 9.7 and B-spline 3. The number of used carriers is 128, 512, and 1,024. Quadrature phase shift key (QPSK) is used with cyclic prefix 1/16 and a bandwidth of 20 MHz. traditional fast fourier transform (FFT) system is compared to the proposed discrete wavelet packet transform (DWPT) to show the BER enhancements. The space-time block coding (STBC) is used to enhance system cabability in error corection. The proposed system shows significant improvement in BER, so that, it reaches to the same BER when using FFT but with less signal to noise ratio (SNR), which interns reduce the power consumed within the system and the cost.

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Section: Introductionmentioning

confidence: 99%

“…Therefore, by using MPA and extending it to the DWPT, series of 𝑥[𝑛] vector can be analyzed using the following transformation matrix for 𝐿 number of stages [23], [24]. By substituting (11) in ( 14), the transformation matrix becomes:…”

mentioning

confidence: 99%