An Enhanced Precoder for Multi User Multiple-Input Multiple-Output Downlink Systems

Lee, Woon-Sang; Ro, Jae-Hyun; You, Young-Hwan; Hwang, Duckdong; Song, Hyoung‐Kyu

doi:10.3390/app10134547

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…The recent study which is related with GBD was proposed in [23]. The MGBD was proposed with enhanced performance compared to GBD.…”

Section: Modified Generalized Block Diagonalizationmentioning

confidence: 99%

“…The Rayleigh fading channel which is frequently used in wireless communication system is used. Many recent studies [2,6,23] also used Rayleigh fading channel. Perfect channel estimation is assumed.…”

Section: Simulation Environmentmentioning

confidence: 99%

“…Therefore, the computational complexity at the receiver is higher than schemes which do not use post-coder. The modified GBD (MGBD) was proposed with enhanced performance compared to GBD in [23]. MGBD uses part of the antenna resources to obtain diversity gain like GBD.…”

Section: Introductionmentioning

confidence: 99%

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Partial Nulling Regularized Block Diagonalization Using Unfair Channel Selection for Post-Coding with Low-Complexity

Hwang

You

et al. 2020

Applied Sciences

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A number of requirements for 5G mobile communication are satisfied by adopting multi-user multiple input multiple output (MU-MIMO) systems. The inter user interference (IUI) which is an inevitable problem in MU-MIMO systems becomes controllable when the precoding scheme is used. The proposed scheme, which is one of the precoding schemes, is built on regularized block diagonalization (RBD) precoding and utilizes the partial nulling concept, which is to leave part of the IUI at the same time. Diversity gain is obtained by leaving IUI, which is made by choosing the row vectors of the channel matrix that are not nullified. Since the criterion for choosing the row vectors of the channel is the power of the channel, the number of selected row vectors of the channel for each device can be unfair. The proposed scheme achieves performance enhancement by obtaining diversity gain. Therefore, the bit error rate (BER) performance is better and the computational complexity is lower than RBD when the same data rate is achieved. When the number of reduced data streams is not enough for most devices to achieve diversity gain, the proposed scheme has better performance compared to generalized block diagonalization (GBD). The low complexity at the receiver is achieved compared to GBD by using the simple way to remove IUI.

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“…The recent study which is related with GBD was proposed in [23]. The MGBD was proposed with enhanced performance compared to GBD.…”

Section: Modified Generalized Block Diagonalizationmentioning

confidence: 99%

Section: Simulation Environmentmentioning

confidence: 99%

See 1 more Smart Citation

Partial Nulling Regularized Block Diagonalization Using Unfair Channel Selection for Post-Coding with Low-Complexity

Hwang

You

et al. 2020

Applied Sciences

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“…The idea of reducing interference based on null space has been widely used in the past, especially for the purpose of spatial multiplexing. In [26], a partial nulling scheme was adopted to obtain diversity gains by utilizing degrees of freedom. In addition, Ref.…”

Section: Introductionmentioning

confidence: 99%

A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems

Wang,

2023

Sensors

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Cell-free massive multiple-input multiple-output (MIMO) is a promising technology for the Internet of Things (IoT) because it can increase connectivity and provide considerable energy efficiency (EE) and spectral efficiency (SE). However, pilot contamination caused by pilot reuse severely limits the performance of the system. In this paper, we propose a left-null-space-based massive access method that can significantly reduce interference among users. The proposed method includes three stages: initial orthogonal access, left-null-space-based opportunistic access and data detection of all accessed users. The simulation results show that the proposed method can achieve much higher spectral efficiency than the existing massive access methods.

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Implementation of peruser threshold based scheduling for improving the BER compared to multi-threshold scheduling for MU-MIMO networks

Balaji,

Vidhya

2024

AIP Conference Proceedings

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An Enhanced Precoder for Multi User Multiple-Input Multiple-Output Downlink Systems

Cited by 6 publications

References 20 publications

Partial Nulling Regularized Block Diagonalization Using Unfair Channel Selection for Post-Coding with Low-Complexity

Partial Nulling Regularized Block Diagonalization Using Unfair Channel Selection for Post-Coding with Low-Complexity

A Left-Null-Space-Based Massive Access Method for Cell-Free Massive MIMO IoT Systems

Implementation of peruser threshold based scheduling for improving the BER compared to multi-threshold scheduling for MU-MIMO networks

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