Analysis and Optimization of Massive Access to the IoT Relying on Multi-Pair Two-Way Massive MIMO Relay Systems
نویسندگان
چکیده
We investigate massive access in the Internet-of-Things (IoT) relying on multi-pair two-way amplify-and-forward (AF) relay systems using multiple-input multiple-output (MIMO). utilize approximate message passing (AMP) algorithm for joint device activity detection and channel estimation. Furthermore, we analyze achievable rates multiple pairs of active devices derive closed-form expressions both maximum-ratio combining/maximum-ratio transmission (MRC/MRT) zero-forcing reception/zero-forcing (ZFR/ZFT)-based beamforming schemes adopted at relay. Moreover, to improve sum rates, propose a low-complexity optimizing pilot length L. Our simulation results verify accuracy MRC/MRT ZFR/ZFT scenarios. Finally, proposed pilot-length optimization performs well
منابع مشابه
Full-Duplex Massive MIMO Multi-Pair Two-Way AF Relaying: Energy Efficiency Optimization
Full-Duplex Massive MIMO Multi-Pair Two-Way AF Relaying: Energy Efficiency Optimization Ekant Sharma, Rohit Budhiraja, K Vasudevan and Lajos Hanzo, Fellow IEEE Abstract We consider two-way amplify and forward relaying, where multiple full-duplex user pairs exchange information via a shared full-duplex massive multiple-input multiple-output (MIMO) relay. Most of the previous massive MIMO relayin...
متن کاملSectoring in Multi-cell Massive MIMO Systems
In this paper, the downlink of a typical massive MIMO system is studied when each base station is composed of three antenna arrays with directional antenna elements serving 120◦ of the two-dimensional space. A lower bound for the achievable rate is provided. Furthermore, a power optimization problem is formulated and as a result, centralized and decentralized power allocation schemes are propos...
متن کاملSemi-Blind Channel Estimation based on subspace modeling for Multi-user Massive MIMO system
Channel estimation is an essential task to fully exploit the advantages of the massive MIMO systems. In this paper, we propose a semi-blind downlink channel estimation method for massive MIMO system. We suggest a new modeling for the channel matrix subspace. Based on the low-rankness property, we have prposed an algorithm to estimate the channel matrix subspace. In the next step, using o...
متن کاملA Successive Optimization Approach to Pilot Design for Multi-Cell Massive MIMO Systems
In this letter, we introduce a novel pilot design approach that minimizes the total mean square errors of the minimum mean square error estimators of all base stations (BSs) subject to the transmit power constraints of individual users in the network, while tackling the pilot contamination in multicell Massive MIMO systems. First, we decompose the original non-convex problem into distributed op...
متن کاملBounds for Multiple-Access Relay Channels with Feedback via Two-way Relay Channel
In this study, we introduce a new two-way relay channel and obtain an inner bound and an outer bound for the discrete and memoryless multiple access relay channels with receiver-source feedback via two-way relay channel in which end nodes exchange signals by a relay node. And we extend these results to the Gaussian case. By numerical computing, we show that our inner bound is the same with o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: IEEE Transactions on Communications
سال: 2021
ISSN: ['1558-0857', '0090-6778']
DOI: https://doi.org/10.1109/tcomm.2021.3072725