Review of Wireless Mimo Channel Models

Anioke, CL; Nnamani, CO; Ani, CI

doi:10.4314/njt.v35i2.20

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…F k ∈ C N t * K represents the pilot sequence signal in the uplink. Assuming that each PU is aware of only the channel state information (CSI) value of each user's CSI, this includes the PU concerning BS [30,32,33], which is out of our debate, and we merely model the communication between PU and SU. In this case, based on the nature of using the Kronecker model and the need to minimize the value of MMSE in the channel approximation, tr(…”

Section: System Modelmentioning

confidence: 99%

A Novel Model for Calculating Uplink-Downlink Spectral Efficiency in Cooperative Communication MIMO Systems

Pouryeganeh

Fard

Tavakoli

2022

International Journal of Antennas and Propagation

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Cooperative communication that enables the use of relays between a base station (BS) and end users is an effective technique against fading to improve network performance, especially in increasing spectral efficiency (SE) and network coverage. However, systems that use cooperative communication have weaknesses in the structure, such as resistance to latency and an increase in the bandwidth of substitute users (SU), which can be improved by optimizing the relay selection method effectively. The system due to insufficient spacing between antennas and insufficient scattering in the channel has spatially faded that leads to spatial correlation. We use Kronecker statistical model correlated multiantenna channels to implement detection techniques and eliminate interference in cooperative communication. The validity of the Kronecker model lies in the fact that correlation coefficients of transmission are independent of the receiving antennas. In other words, the spatial correlation model separates both ends of the communication link. Therefore, using the minimum mean-squared-error (MMSE) technique, we have removed the need for optimal elimination of interference between SU and relay service provider or primary user (PU). Regardless of BS performance, the scope of this work is restricted to the layer after the BS in the interaction between the service providers and substitute users. The primary purpose of the presented method is to improve the spectral gain through the elimination of interference. Simulation results show about 10% of SE improvement along with considerable traffic gain.

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Section: System Modelmentioning

confidence: 99%

A Novel Model for Calculating Uplink-Downlink Spectral Efficiency in Cooperative Communication MIMO Systems

Pouryeganeh

Fard

Tavakoli

2022

International Journal of Antennas and Propagation

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“…Instead, it provides simple models, which give a useful insight into the underlying behavior of a system before the aforementioned factors, are considered. Therefore, the model can be said to be useful in simulating the background noise of a channel [17]. This model inputs a white Gaussian noise to the signal that passes through it for analysis purposes.…”

Section: Additive White Gaussian Noise Channel (Awgn)mentioning

confidence: 99%

Characterization of Orthogonal Frequency Division Multiplexing (OFDM) Communication Links

Adewale¹,

Olarewaju²,

Olalekan³

2020

AJEEE

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The demand for high data rate transmission is rapidly increasing in the area of wireless communications and Orthogonal Frequency Division Multiplexing (OFDM) is known to be a promising technique for high-rate transmission that can overcome the inter symbol interference (ISI) which results from the time dispersive nature of wireless channels. The idea is to utilize a number of carriers, spread regularly over a frequency band, in such a way so that the available bandwidth is utilized to maximal efficiency. This study presents the comparison of the performance of different modulation schemes: M-ary phase shift keying (M-PSK) and M-ary quadrature amplitude modulation (M-QAM) over Additive White Gaussian Noise (AWGN), Rayleigh and Rician multipath fading channels in OFDM system. Bit error rate (BER) was used to evaluate the performance of the system; the number of fast Fourier transform (FFT) points used during the transmission was also examined. The results showed that for all the channels, lower order modulation schemes perform better than the higher order schemes. This comes at the detriment of the data rate, as lower order schemes have lower data rates compared with their higher order counterparts. In addition, it was observed that the system performed better in AWGN channel than Rayleigh and Rician fading channels for all the modulation schemes used. It was observed that the number of FFT points used during the transmission do not have much effects on the performance of the system.

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“…These random processes can come from some natural sources such as thermal noise and sun. The model does not account for fading, frequency selectivity, interference, non-linearity or dispersion [17,18]. Instead, it provides simple models, which give a useful insight into the underlying behaviour of a system before the aforementioned factors, are considered.…”

Section: Digital Modulation In Ofdm Systemsmentioning

confidence: 99%

Bit error rate analysis of different digital modulation schemes in orthogonal frequency division multiplexing systems

2018

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This study presents the design of an orthogonal frequency division multiplexing (OFDM) system and analyses the performance of the different digital modulation techniques employed in the system. The OFDM system was modelled and different modulation schemes: M-ary phase shift keying (M-PSK) and M-ary quadrature amplitude modulation (M-QAM) were employed over two different channels: additive white Gaussian noise (AWGN), and Rayleigh multipath fading channels. Bit error rate (BER) analysis was carried out for the different digital modulation schemes over the two channels, and the number of fast Fourier transform (FFT) points used during the transmission was examined. Generally, results showed that over both AWGN and Rayleigh fading channels, lower order modulation schemes perform better than the higher order schemes. This comes at the detriment of the data rate, as lower order schemes have lower data rates compared with their higher order counterparts. In addition, it was observed that the system performed better over AWGN channel than Rayleigh fading channel for all modulation schemes used. On the number of FFT points used during the transmission, findings revealed that the performance of the system is more or less not really affected by the number of FFT points employed during transmission.

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Review of Wireless Mimo Channel Models

Cited by 4 publications

References 24 publications

A Novel Model for Calculating Uplink-Downlink Spectral Efficiency in Cooperative Communication MIMO Systems

A Novel Model for Calculating Uplink-Downlink Spectral Efficiency in Cooperative Communication MIMO Systems

Characterization of Orthogonal Frequency Division Multiplexing (OFDM) Communication Links

Bit error rate analysis of different digital modulation schemes in orthogonal frequency division multiplexing systems

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