scholarly journals A High-Throughput Random Access Protocol for Multiuser MIMO Systems

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Haiyou Guo ◽  
Honglin Hu ◽  
Yan Zhang
Keyword(s):  
High Throughput ◽  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Random Access ◽  
Spatial Multiplexing ◽  
Access Protocol ◽  
Random Access Protocol ◽  
Input Multiple Output ◽  
Stable Throughput ◽  
Analytical Result

We propose a high-throughput random access protocol for2×2multiuser multiple-input multiple-output (MIMO) systems. The cross-layer mechanism utilizes the packets combining technique to exploit the advantages of both spatial multiplexing and multipacket reception. Analytical result indicates that the proposed scheme achieves 0.669 per spatial degree of freedom in stable throughput, which is much higher than those in the existed studies.

scholarly journals On the Probability of Erasure for MIMO-OFDM

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Kasturi Vasudevan ◽  
A. Phani Kumar Reddy ◽  
Gyanesh Kumar Pathak ◽  
Shivani Singh
Keyword(s):  
Fading Channels ◽  
Communication Systems ◽  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Spatial Multiplexing ◽  
Main Requirement ◽  
Valid Signal ◽  
Input Multiple Output ◽  
Mimo Ofdm ◽  
Wireless Standards

Detecting the presence of a valid signal is an important task of a telecommunication receiver. When the receiver is unable to detect the presence of a valid signal, due to noise and fading, it is referred to as an erasure. This work deals with the probability of erasure computation for orthogonal frequency division multiplexed (OFDM) signals used by multiple input multiple output (MIMO) systems. The theoretical results are validated by computer simulations. OFDM is widely used in present day wireless communication systems due to its ability to mitigate intersymbol interference (ISI) caused by frequency selective fading channels. MIMO systems offer the advantage of spatial multiplexing, resulting in increased bit-rate, which is the main requirement of the recent wireless standards like 5G and beyond.

scholarly journals SCHEDULING FOR MASSIVE MIMO USING CHANNEL AIGING UNDER QOS CONSTRAINTS

2019 ◽  
Vol 57 (5) ◽  
pp. 617
Author(s):  
Pham Hung ◽  
Bac Hoai Dang ◽  
Ban Tien Nguyen
Keyword(s):  
Massive Mimo ◽  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Spatial Multiplexing ◽  
Bit Rate ◽  
Minimum Rate ◽  
Mimo Networks ◽  
Input Multiple Output ◽  
Sum Rate ◽  
Service Data

Massive multiple-input multiple-output (MIMO) networks support QoS (Quality of Service) by adding a new sublayer Service Data Adaption Protocol on the top of Packet Data Convergence Protocol layer to map between QoS flows and data radio bearers. In downlink for Guaranteed Bit Rate (GBR) flows, the gNB guarantees the Guaranteed Flow Bit Rate (GFBR) that defines the minimum bit rate the QoS flow can provide. So, one of the most important requirements is the minimum rate. The channel aiging helps to improve the sum-rate of Massive MIMO systems by serving more users to increase the spatial multiplexing gain without incurring additional pilot overhead. In this paper, a novel scheduler, termed QoS-Aware scheduling, is designed and proposed for Massive MIMO to use the channel aiging to increase the sum-rate but guarantee the minimum bit rate per user to support QoS. We investigate how many users are enough to serve to maximize the sum-rate while keeping the data rate per user meeting a given threshold. Through the numerical analysis we confirmed that QoS-Aware scheduling can guarantee a minimum rate per user and get a higher useful through-put (goodput) than conventional channel aiging schedulers.

scholarly journals A Random Access Protocol for Pilot Allocation in Crowded Massive MIMO Systems

2017 ◽  
Vol 16 (4) ◽  
pp. 2220-2234 ◽  
Author(s):  
Emil Bjornson ◽  
Elisabeth de Carvalho ◽  
Jesper H. Sorensen ◽  
Erik G. Larsson ◽  
Petar Popovski
Keyword(s):  
Massive Mimo ◽  
Mimo Systems ◽  
Random Access ◽  
Access Protocol ◽  
Pilot Allocation ◽  
Random Access Protocol

scholarly journals Signal Detection in Spatially Multiplexed MIMO Systems

2021 ◽  
Vol 9 (VI) ◽  
pp. 5002-5005
Author(s):  
Mohan Reddy
Keyword(s):  
Signal Detection ◽  
Mimo Systems ◽  
Minimum Mean Square Error ◽  
Multiple Input Multiple Output ◽  
Spatial Multiplexing ◽  
Multiple Receivers ◽  
Rate Versus ◽  
Multiple Input ◽  
The Matrix ◽  
Input Multiple Output

The transmission of several signals and reception of those signals, it requires the implementation of multiple transmitters at the transmitter side and the multiple receivers at the receiver side. This type of system is called multiple input multiple output (M.I.M.O) system. The M.I.M.O systems will result in obtaining the better use of the available spectrum for transmissions of the different signals in the same spectrum and this makes the M.I.M.O systems most dependable for the wireless communications. But the presence of several signals in the same bandwidth of spatial multiplexing matrix in M.I.M.O systems makes it difficult for the signal to get detected at the receiver end. There are plenty of techniques introduced to avoid the difficulty in sensing the signal at receiver in M.I.M.O systems. In this paper we will be discussing about the signal detection technique called minimum mean square error technique (MMSE) which uses the inversion of the matrix to retrieve the signal and the iteration-based method that is an improvised technique than MMSE technique where the matrix inversion step is avoided and provides better results. The results are obtained by plotting the bit error rate versus the signal to nose ratio using MATLAB

scholarly journals Performance Analysis of Efficient Random-Access Protocol in Crowded LTE Network over Fading Channel

2019 ◽  
Vol 9 (2) ◽  
pp. 4737-4740
Keyword(s):  
Random Access ◽  
Future Generations ◽  
Operational Effectiveness ◽  
Access Protocol ◽  
Access Technology ◽  
Lte Networks ◽  
Access Protocols ◽  
Random Access Protocol ◽  
Input Multiple Output

A promising wireless access technology 5G and beyond 5G is a massive multi-input multiple output (MIMO), which can deliver enormous performance relative with present technology in attempt to meet certain demands in future generations of wireless networks. Massive MIMO achieves outstanding operational effectiveness by temporal multiplexing of several user equipment (UE). These benefits are only achieved when several UE’s can efficiently link to the wireless network than it is today. As the UE node continues to grow while each and every EU accesses the network irregularly, random access protocols play an important part in the distribution of the limited no. of pilots among linked UE's. This article contains traditional methods of pilot distribution in MIMO-based networks and random entry protocols for pilot allocations in overcrowded Long-term Development (LTE) networks

scholarly journals Enhancing performance in a LOS MIMO communication using a passive repeater

2021 ◽  
Vol 2140 (1) ◽  
pp. 012013
Author(s):  
Mahmoud Eissa ◽  
D Sukhanov
Keyword(s):  
Mimo Systems ◽  
Multiple Input Multiple Output ◽  
Antenna System ◽  
Spatial Multiplexing ◽  
Line Of Sight ◽  
Mimo Communications ◽  
Matrix Rank ◽  
Channel Matrix ◽  
Multiple Input ◽  
Input Multiple Output

Abstract This paper presents a technique for obtaining a well-conditioned channel matrix in a line of sight multiple input multiple output (MIMO) environment. The technique is based on the implementation of a back-to-back antenna system as a passive repeater to enhance performance in MIMO systems. The flexible configuration with no need for a phase controller allows to spread the proposed repeater in MIMO communications to ensure spatial multiplexing and enhance capacity. A condition number and matrix rank are proposed as metrics to demonstrate the validity of the proposed method.

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