Spectral Efficiency Improvement in Massive MIMO Systems

Rajmane, Rohan S.; Sudha, V.

doi:10.1109/imicpw.2019.8933274

Cited by 11 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…S (k) ∈ ℂ U ×N , in which C represents the precoding matrix composed of rotation factors, U is the total number of elements of one UCA, and l M t is the M t -th OAM mode generated by U elements. For N t transmit antennas, the signal obtained after OAM modulation is S = [ S (1) S (2) … S (N t ) ] T . Therefore, the composite baseband signal model of the SFMHM scheme is given by…”

Section: Received Signal Modelmentioning

confidence: 99%

“…Finally, a three-dimensional matrix of size (M t , N, N t ) will be obtained at the receiver. We defined it as g = [ g (1) g (2) … g (k) … g (N r ) ] T in which the positions of N u elements with the largest absolute values determine the index of the combination in the subset. Swap the rows and columns of each page of the matrix g, and the position of each element in this matrix is expressed as (n), n = 1, 2, … , N × M t × N t , and (n) ∈…”

Section: Receiver Detectionmentioning

confidence: 99%

“…As N u must be an integer, the optimal value N * u is therefore obtained according to formula (2), and the maximum transmission rate, with the actual modulation rate being integer, is obtained as follows,…”

Section: Appendix B Proof Of Theoremmentioning

confidence: 99%

“…Compared with single-antenna systems, multiple-antenna systems can improve spectrum efficiency and system performance without adding extra bandwidth. However, the actual multiple-input multiple-output (MIMO) systems, especially the massive MIMO systems, face the problems of high cost and hardware complexity caused by multiple radio frequency (RF) chains at the transceiver [1,2].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Space–frequency‐mode multi‐dimensional hybrid modulation for vortex wave MIMO‐OFDM systems

Liu

Sun

et al. 2021

IET Communications

View full text Add to dashboard Cite

By exploiting a dimension called orbital angular momentum (OAM) modes, a new modulation scheme referred to as multi-dimensional space-frequency-mode hybrid modulation (SFMHM) is proposed in this paper, which aims to further improve the MIMO-OFDM system's spectrum efficiency and meet the demand of the future wireless communication networks. The key idea of SFMHM is to map a block of information bits to two information-carrying units: (1) symbols chosen from a constellation diagram, (2) the indices of a subset chosen from all combinations of antennas, OAM modes, and subcarriers. A mapping method with low complexity for SFMHM is presented in this paper, which can reduce the computational complexity of the transmitter significantly. Simulation results show that, in LOS channels, SFMHM systems can achieve better performance compared with traditional MIMO-OFDM systems.

show abstract

Section: Received Signal Modelmentioning

confidence: 99%

Section: Receiver Detectionmentioning

confidence: 99%

Section: Appendix B Proof Of Theoremmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Space–frequency‐mode multi‐dimensional hybrid modulation for vortex wave MIMO‐OFDM systems

Liu

Sun

et al. 2021

IET Communications

View full text Add to dashboard Cite

show abstract

“…The system capacity can be greatly increased. It brings high energy efficiency and high spectrum efficiency [1]. Massive MIMO technology has attracted much attention because of these advantages.…”

Section: Introductionmentioning

confidence: 99%

Pilot Allocation Scheme Based on Machine Learning Algorithm and Users’ Angle of Arrival in Massive MIMO System

Chen

2021

Communications and Networking

View full text Add to dashboard Cite

Massive MIMO system has attracted attention due to it's significant improvement in system capacity and spectrum utilization. Pilot pollution greatly limited the performance of Massive MIMO system. To optimize the pilot pollution in Massive MIMO system. In this paper, a pilot allocation scheme based on machine learning algorithm and users' angle of arrival is proposed. The scheme firstly classified all users according to whether the users' angle of arrival overlaps with each other. It randomly assigned pilot sequences to users whose angle of arrival do not overlap with each other. Secondly, it used machine learning algorithm to classify users whose angle of arrival overlap with each other into interfering group and non-interfering groups based on users' location information. We assign orthogonal pilots to users in the interfering group and randomly assign pilot sequences to users in the non-interfering group. Simulation results show that when the number of antenna reached 300, the pilot efficiency can be increased by about 11.67%. The pilot allocation scheme proposed in this paper can effectively suppress the impact of pilot pollution on the performance of Massive MIMO system, improve pilot efficiency and reduce pilot overhead.

show abstract

The Novel Approach of Down-Link Spectral Efficiency Enhancement Using Massive MIMO in Correlated Rician Fading Scenario

Patel,

Patel

2022

Communications in Computer and Information Science

View full text Add to dashboard Cite

Spectral Efficiency Improvement in Massive MIMO Systems

Cited by 11 publications

References 9 publications

Space–frequency‐mode multi‐dimensional hybrid modulation for vortex wave MIMO‐OFDM systems

Space–frequency‐mode multi‐dimensional hybrid modulation for vortex wave MIMO‐OFDM systems

Pilot Allocation Scheme Based on Machine Learning Algorithm and Users’ Angle of Arrival in Massive MIMO System

The Novel Approach of Down-Link Spectral Efficiency Enhancement Using Massive MIMO in Correlated Rician Fading Scenario

Contact Info

Product

Resources

About