Performance Analysis of Linear Precoding in Massive MIMO Systems With Finite-Alphabet Inputs

Zhu, Xiaodong; Meng, Zhonglou; Xie, Jianliang; Tu, Xiaodong; Zeng, Weiliang

doi:10.1109/access.2019.2925939

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…The subsequent signal at the receiver side [23] of the i th user (user 1 and 2) can be represented as:…”

Section: Proposed System Design and Considerationsmentioning

confidence: 99%

An Efficient PAPR Reduction Scheme for Delta Sigma Modulated Hybrid NOMA System

Mathur

Deepa

2023

Preprint

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System based on orthogonal frequency division multiplexing with non-orthogonal multiple access represents one of the most promising technology for the next generation of broadcasting and communication systems. One of the main challenges in OFDM-based systems is achieving a high peak-to-average power ratio (PAPR). This paper proposes a novel precoding method, namely Zadoff-Chu matrix transform, for PAPR reduction in OFDM NOMA systems. On top of that, continuous-magnitude OFDM signals require an expensive mixed-signal DAC, and LED drivers need to be modified. Using delta-sigma modulators (DSM), we propose that continuous magnitude OFDM symbols can be converted into signals of LED driver using visible light OFDM systems by introducing ZCT precoded DSM based OFDM NOMA system in this work. This can reduce nonlinear distortion in the DAC and driving circuits due to a high PAPR. We demonstrate that the developed scheme successfully reduces PAPR in a remarkably better way.

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“…The subsequent signal at the receiver side [23] of the i th user (user 1 and 2) can be represented as:…”

Section: Proposed System Design and Considerationsmentioning

confidence: 99%

An Efficient PAPR Reduction Scheme for Delta Sigma Modulated Hybrid NOMA System

Mathur

Deepa

2023

Preprint

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“…The MIMO technology can be realized through three main methods: spatial multiplexing, spatial diversity (such as space-time coding and diversity reception), and beam forming (space-time precoding). These methods are not often used independently in large-scale MIMO systems, instead, they are often jointly designed based on the characteristics of the communication system [4][5][6]. By using these methods separately or in combination, the MIMO system can achieve a range of performance improvements such as multiplexing gain, diversity gain, coding gain, antenna gain, and interference suppression.…”

Section: Implementation Of Mimo Systemmentioning

confidence: 99%

Application and Performance of Space Time Coding in MIMO System—Analysis of Alamouti Space Time Coding Scheme

2023

jaip

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This research first intuitively shows the implementation diagram of a MIMO system, and then introduces transmission diversity and space-time coding technology, with space-time coding technology belonging to the category of spatial diversity technology. The earliest and most classical Alamouti space-time coding scheme is then applied to MIMO wireless communication systems. The principle of the Alamouti space-time coding scheme is demonstrated, and a theoretical demonstration is carried out in a MIMO diversity system with two transmitters and one receiver. Finally, the Alamouti space-time coding scheme is simulated using MATLAB, and it is verified that the diversity gain and coding gain are obtained by using the Alamouti space-time coding scheme in the MIMO system.

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“…For a relay network, [17] and [18] proposed appropriately optimal precoder designs, where all the nodes are assumed to be equipped with constant power supply. Nowadays, research on precoder designs with finitealphabet inputs has been extended to multiple access channel (MAC) systems [19], secure transmission networks [20], [21], and massive MIMO systems [22]. In the practical systems with finite-alphabet inputs, all the results of these works verified the superiority of the precoder design based on finite-alphabet inputs instead of Gaussian inputs.…”

Section: Introductionmentioning

confidence: 98%

Joint Precoder Design for SWIPT-Enabled MIMO Relay Networks With Finite-Alphabet Inputs

Chen

Zhu

2020

IEEE Access

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In this paper, the problem of mutual information maximization in a two-hop multiple-input multiple-output (MIMO) relay network with simultaneous wireless information and power transfer (SWIPT) is investigated, where the relay node, without constant power supply, harvests the energy for information forwarding. The goal is to maximize the mutual information by using the joint design of source and relay precoders, which is formulated as an optimization problem under the constraints of transmit power and harvested energy. Two scenarios with practical energy harvesting schemes employed at the relay, i.e., power splitting (PS) and time switching (TS) schemes, are considered. Although the formulated optimization problems in the two scenarios are both nondeterministic polynomial-time (NP)-hard, by exploiting the structure of the optimization problems and analyzing the characteristics of precoders, we develop near optimal joint source and relay precoding algorithms for them. Additionally, we analyze the feasible regions of PS and TS ratios, respectively, and propose a backtracking line search based method to find near optimal PS and TS ratios. The main contributions of this paper are as follows: 1) Unlike existing works based on the assumption of ideal Gaussian signals, this paper supposes the inputs to the network are finite-alphabet signals, which is a more practical scenario. 2) The high complexity of mutual information with finitealphabet signals leads to an intractable optimization problem; however, an efficient solving framework based on semidefinite relaxation (SDR) and Karush-Kuhn-Tucker (KKT) theorem is proposed. Finally, simulation results verify the efficacy of the proposed joint precoding designs. INDEX TERMS Finite-alphabet inputs, joint precoding design, simultaneous wireless information and power transfer (SWIPT), multiple-input multiple-output (MIMO), relay network.

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Performance Analysis of Linear Precoding in Massive MIMO Systems With Finite-Alphabet Inputs

Cited by 9 publications

References 29 publications

An Efficient PAPR Reduction Scheme for Delta Sigma Modulated Hybrid NOMA System

An Efficient PAPR Reduction Scheme for Delta Sigma Modulated Hybrid NOMA System

Application and Performance of Space Time Coding in MIMO System—Analysis of Alamouti Space Time Coding Scheme

Joint Precoder Design for SWIPT-Enabled MIMO Relay Networks With Finite-Alphabet Inputs

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