scholarly journals Coherent Receiver for Turbo Coded Single-User Massive MIMO-OFDM with Retransmissions

Multiplexing ◽  
2019 ◽  
Author(s):  
K. Vasudevan ◽  
Shivani Singh ◽  
A. Phani Kumar Reddy
Keyword(s):  
Massive Mimo ◽  
Mimo Ofdm ◽  
Single User ◽  
Coherent Receiver

A companding approach for PAPR suppression in OFDM based massive MIMO system

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ajay Kumar Yadav ◽  
Pritam Keshari Sahoo ◽  
Yogendra Kumar Prajapati
Keyword(s):  
Massive Mimo ◽  
Orthogonal Frequency Division Multiplexing ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Average Power ◽  
Base Station ◽  
Convex Optimization Problem ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Mimo Ofdm

Abstract Orthogonal frequency division multiplexing (OFDM) based massive multiuser (MU) multiple input multiple output (MIMO) system is popularly known as high peak-to-average power ratio (PAPR) issue. The OFDM-based massive MIMO system exhibits large number of antennas at Base Station (BS) due to the use of large number of high-power amplifiers (HPA). High PAPR causes HPAs to work in a nonlinear region, and hardware cost of nonlinear HPAs are very high and also power inefficient. Hence, to tackle this problem, this manuscript suggests a novel scheme based on the joint MU precoding and PAPR minimization (PP) expressed as a convex optimization problem solved by steepest gradient descent (GD) with μ-law companding approach. Therefore, we develop a new scheme mentioned to as MU-PP-GDs with μ-law companding to minimize PAPR by compressing and enlarging of massive MIMO OFDM signals simultaneously. At CCDF = 10−3, the proposed scheme (MU-PP-GDs with μ-law companding for Iterations = 100) minimizes the PAPR to 3.70 dB which is better than that of MU-PP-GDs, (iteration = 100) as shown in simulation results.

scholarly journals Data Detection in Single User Massive MIMO Using Re-Transmissions

2019 ◽  
Vol 6 (1) ◽  
pp. 15-26 ◽  
Author(s):  
K. Vasudevan ◽  
K. Madhu ◽  
Shivani Singh
Keyword(s):  
Massive Mimo ◽  
Turbo Code ◽  
Additive White Gaussian Noise ◽  
Multiple Input Multiple Output ◽  
Low Complexity ◽  
Base Station ◽  
Mimo Channel ◽  
Data Detection ◽  
Major Drawback ◽  
Single User

Background:Single user Massive Multiple Input Multiple Output (MIMO) can be used to increase the spectral efficiency since the data is transmitted simultaneously from a large number of antennas located at both the base station and mobile. It is feasible to have a large number of antennas in the mobile, in the millimeter wave frequencies. However, the major drawback of single user massive MIMO is the high complexity of data recovery at the receiver.Methods:In this work, we propose a low complexity method of data detection with the help of re-transmissions. A turbo code is used to improve the Bit-Error-Rate (BER).Results and Conclusion:Simulation results indicate a significant improvement in BER with just two re-transmissions as compared to the single transmission case. We also show that the minimum average SNR per bit required for error-free propagation over a massive MIMO channel with re-transmissions is identical to that of the Additive White Gaussian Noise (AWGN) channel, which is equal to -1.6 dB.

scholarly journals Distributed Channel Estimation and Pilot Contamination Analysis for Massive MIMO-OFDM Systems

2016 ◽  
Vol 64 (11) ◽  
pp. 4607-4621 ◽  
Author(s):  
Alam Zaib ◽  
Mudassir Masood ◽  
Anum Ali ◽  
Weiyu Xu ◽  
Tareq Y. Al-Naffouri
Keyword(s):  
Channel Estimation ◽  
Massive Mimo ◽  
Pilot Contamination ◽  
Ofdm Systems ◽  
Mimo Ofdm

scholarly journals Channel Compensation for Reciprocal TDD Massive MIMO-OFDM With IQ Imbalance

2017 ◽  
Vol 6 (6) ◽  
pp. 778-781 ◽  
Author(s):  
Yan Liang ◽  
Hongbin Li ◽  
Fei Li ◽  
Rongfang Song ◽  
Lihua Yang
Keyword(s):  
Massive Mimo ◽  
Iq Imbalance ◽  
Mimo Ofdm

Low-Complexity and High-Accuracy Semi-blind Joint Channel and Symbol Estimation for Massive MIMO-OFDM

2018 ◽  
Vol 38 (3) ◽  
pp. 1114-1136 ◽  
Author(s):  
Ricardo Kehrle Miranda ◽  
João Paulo C. L. da Costa ◽  
Binghua Guo ◽  
André L. F. de Almeida ◽  
Giovanni Del Galdo ◽  
...  
Keyword(s):  
Massive Mimo ◽  
Low Complexity ◽  
High Accuracy ◽  
Mimo Ofdm ◽  
Joint Channel

Training Based Hybrid Precoding Scheme for Multiuser Massive MIMO-OFDM

2021 ◽  
pp. 1-1
Author(s):  
Yiwei Sun ◽  
Hua Wang ◽  
Minghao Yuan ◽  
Tianye Zhu ◽  
Agnes Kawoya
Keyword(s):  
Massive Mimo ◽  
Hybrid Precoding ◽  
Mimo Ofdm

PERFORMANCE EVOLUTION OF MASSIVE MIMO-OFDM FOR VLC COMMUNICATIONS

2020 ◽  
Vol 9 (1) ◽  
pp. 18
Author(s):  
B. SRIDHAR ◽  
S. SRIDHAR ◽  
V. NANCHARIAH ◽  
◽  
◽  
...  
Keyword(s):  
Massive Mimo ◽  
Mimo Ofdm
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