Wiener-based smoother and predictor for massive-MIMO downlink system under pilot contamination

Mazlan, M. Hasbullah; Behjati, Mehran; Nordin, Rosdiadee; Ismail, Mahamod

doi:10.1007/s11235-017-0341-0

Cited by 11 publications

(4 citation statements)

References 27 publications

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“…We can observed that the correlation for FT based model where α = 90° is less than all the FrFT chirp angles. For example, when f d = 0.7, the maximum value of correlation is at α = 12°; so this is taken as an optimal angle and it is 0.5887 more in correlation than α = 90° 14 . Figure 4A depicts the BER versus SNR for FrFT based large scale MIMO system; the new BER expression derived has been validated by using simulation results, and the parameter considered is shown in Table 2.We consider downlink system with zero‐forcing precoding technique and with imperfect channel state information; results show that the mathematical BER expression derived is nearly matched with the simulation analysis method.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…In this section, single cell multiuser massive MIMO‐FrFT‐OFDM system has been considered where K number of single antenna users communicate with base station equipped with M number of antennas where M > > K as shown in Figure 1 10,14 . For uplink TDD data communication, users transmit the frequency domain QAM modulated data vector X ( k ) of length N to k th subcarrier of IFrFT.…”

Section: System Modelmentioning

confidence: 99%

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Intercarrier interference analysis for massive MIMO fractional Fourier transform‐OFDM systems over time‐varying channels

Chawla

Kansal

2020

Int J Communication

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SummaryMassive multiple‐input multiple‐output orthogonal frequency division multiplexing (MIMO‐OFDM) system is an approach to increase data rate and spectral efficiency of 5G wireless communication systems. It's easy to analyze the performance of any system with the assumption of immobile users, but if the user is moving with varying velocity, then the communication between user and base station (BS) is very difficult to maintain. Under high mobility, rapidly fading, doubly dispersive, and nonstationary environment, the conventional system fails to respond and leads to the problem of intercarrier interference (ICI). To overcome these problems, fractional Fourier transform (FrFT) has been used in place of Fourier transform (FT) to increase the correlation coefficient, to mitigate effect of ICI, and to improve bit error rate. In this paper, novel formulae for correlation coefficient, average power of ICI, and closed form bit error expression have been derived for the proposed system by considering fast‐fading model and imperfect channel state information. Finally, the comparison of both the systems conventional and proposed proved that the proposed system has improved bit error rate by 40% and intercarrier interference cancelation by 70%.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: System Modelmentioning

confidence: 99%

Intercarrier interference analysis for massive MIMO fractional Fourier transform‐OFDM systems over time‐varying channels

Chawla

Kansal

2020

Int J Communication

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“…Here, the performance was discovered better, but having massive-pilot overhead. In the paper [21], the author modeled the BDF function, and the wiener-based filter is based on the performance of the per-cell rate and error of channel estimation for conquering the effects of pilot contamination. In the paper [22], simple-2-ADC (advancedconverters) pulled into consideration a larger number of MIMO and frameworks with a high capacity of data transfer.…”

Section: Literature Surveymentioning

confidence: 99%

A Novel Adaptive Channel Allocation Scheme for Multi-Cell Massive MIMO Systems

2021

IJIES

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“…For a mMIMO system, the time division duplex (TDD) method can be used to feasibly approximate and exploit the possible maximum number of channel coefficients by transmitting pilots from the UEs [6,7,8]. In this manner, each BS can approximate and utilize the channel coefficients for data transmissions in both downlink and uplink channels.…”

Section: Introductionmentioning

confidence: 99%

Beamforming with 2D-AOA estimation for pilot contamination reduction in massive MIMO

Ali

Ismail²,

Nordin³

et al. 2018

Telecommun Syst

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The upcoming fifth-generation wireless mobile systems are projected to be commercialized in the year 2020 and are set to play the main role in massive multiple input-multiple output (mMIMO) integrated with the technologies of beamforming antenna arrays. However, the performance of mMIMO is constrained by inter-cell interference from adjacent cells triggered by the reused pilot, an issue termed pilot contamination. To address this issue, this paper focuses on mitigating pilot contamination by implementing a suboptimal spatial source detection method based on the beamforming approach using a two-dimensionunitary estimation of the signal parameters through rotational invariance techniques algorithm. We jointly used 2D-AOA information (azimuth and elevation angles) and statistical channel estimations at the BSs to identify the channels correlation condition and evaluate the sum rate performance of users based on AOA. The detected signals from the uniform rectangular array are used to segregate the required signal from the interfering signal without any change to the pilot construction of the training signals. The performance of the minimum mean squared error beamforming (MMSE-beamforming) technique in the multi-cell mMIMO system of the aforementioned method is numerically evaluated and then compared with conventional methods that depend only on pilot identity information. The simulation reveals that the achievable sum rate gains of 2D-AOA and the pilot identity information techniques (best case) with respect to deterministic MMSE are 96.3% and 85.4%, respectively, thus showing the prospect of eliminating the majority of pilot contamination using the 2D-AOA estimation. Keywords 2-D angle of arrival • 2D-UESPRIT • Massive MIMO • MMSE-beamforming • Pilot contamination • Uniform rectangular array B Ehab Ali

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Wiener-based smoother and predictor for massive-MIMO downlink system under pilot contamination

Cited by 11 publications

References 27 publications

Intercarrier interference analysis for massive MIMO fractional Fourier transform‐OFDM systems over time‐varying channels

Intercarrier interference analysis for massive MIMO fractional Fourier transform‐OFDM systems over time‐varying channels

A Novel Adaptive Channel Allocation Scheme for Multi-Cell Massive MIMO Systems

Beamforming with 2D-AOA estimation for pilot contamination reduction in massive MIMO

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