Subscribe to the gold package and get unlimited access to Shamra Academy
Register a new userComparison of the performance of the linear beam forming techniques applied to the downlink of multi-user MIMO system
مقارنة أداء تقنيات تشكيل الحزمة الخطية المطبقة على الوصلة الهابطة لنظام MIMO متعدد المستخدمين
1103
3 36
0.0
(
0
)
Added by
Aِl-Baath University ورقة بحثية
Publication date
2019
fields
Communication Engineering
and research's language is
العربية
Created by
Ali Jeha
Ask ChatGPT about the research
تقدم أنظمة MIMO متعدد المستخدمين (MU-MIMO) سعة عالية من خلال الاستفادة من الوصول المتعدد بالتقسيم المكاني. إن معلومات حالة القناة عند محطة القاعدة (BS) أو نقطة الوصول (AP) هامة جدا, حيث أنها تسمح بمعالجة مشتركة لكافة إشارات المستخدمين مما ينتج تحسن كبير جدا في الأداء وزيادة في معدلات البيانات. إذا كانت معلومات حالة القناة متوفرة عند محطة القاعدة أو نقطة الوصول, يكون من الممكن أن نخفض أو نزيل التداخل بين المستخدمين (MUI) بشكل فعال من خلال استخدام تشكيل الحزمة (Beamforming) أو استخدام الشيفرات غير الخطية (Dirty-Paper). يسمح التشفير المسبق أيضا بأن نؤدي معظم المعالجة المعقدة عند محطة القاعدة أو نقطة الوصول الأمر الذي ينتج عنه تبسيط كبير في طرفيات المستخدمين. تقنيات التشفير المسبق الخطية لديها ميزة فيما يخص التعقيدية الحسابية. أما تقنيات التشفير غير الخطية فإنها تملك تعقيدية حسابية أعلى وتتطلب بعض التشوير (Signaling) الإضافي لكنها في المقابل يمكن أن تقدم أداء أفضل مقارنة مع التقنيات الخطية. في هذا البحث نقوم بالمقارنة بين أداء العديد من تقنيات التشفير المسبق الخطية من خلال المحاكاة باستخدام برنامج R2014a))MATLAB لنظام MU-MIMO. سوف يتم تحليل و مقارنة معدل السعة الإجمالية لدى كل مستخدم (Sum Rate) ومعدل خطأ البت (BER) الناتجين عن استخدام كل من تقنيات التشفير المسبق الخطية بالنسبة لنسبة الإشارة إلى الضجيج SNR [dB] و عدد هوائيات محطة القاعدة .NBS بالمقارنة بين تقنيات تشكيل الحزمة الخطية (Beamforming Linear) لنظام Multi-User MIMO نجد أن تقنية تحليل القيمة المفردة (svd) تقدم الأداء الأفضل مقارنة مع باقي التقنيات الخطية من ناحية تحقيق معدلات سعة اعلى عند المستخدمين (Sum-Rate) و تحقيق معدل خطأ بت (BER) أقل نسبيا.
Multi user multiple-input multiple-output (MIMO) systems provide high capacity with the benefits of space division multiple access. The channel state information at the base station (BS) or access point (AP) is very important since it allows joint processing of all users’ signals which results in a significant performance improvement and increased data rates. If the channel state information is available at the BS/AP, it can be used to efficiently eliminate or suppress multi-user interference (MUI) by beamforming or by using ”dirty-paper” codes. The precoding also allows us to perform most of the complex processing at the BS/AP which results in a simplification of users’ terminals. Linear precoding techniques have an advantage in terms of computational complexity. Non-linear techniques have a higher computational complexity and require some signaling overhead but can provide a better performance than linear techniques. In this research we compare the performance of several linear techniques through simulation using a program MATLAB (R2014a) for multi-user MIMO system. The Sum Rate and the BER resulting from the use of linear pre-coding techniques corporation to SNR [dB] and the number of base station antennas (NBS) will be analyzed and compared. In comparison between the multi-user MIMO Beamforming Linear techniques, we found that the single-value analysis (SVD) technology performs better than the other linear techniques in terms of achieving higher sum-rate and the bit error rate (BER) is relatively less.
References used
1- QUENTIN H. SPENCER . Christian B. Peel . A. Lee Swindlehurst . Martin Haardt, R2004- An Introduction to the Multi-User MIMO Downlink. IEEE Communications Magazine , October 2004 , 60-67P. 2- C.-C. JAY KUO • SHANG-HO TSAI • LAYLA TADJPOUR •YU-HAO CHANG, R2008- PRECODING TECHNIQUES FOR DIGITAL COMMUNICATION SYSTEMS. SPRINGER SCIENCE+BUSINESS MEDIA, NEW YORK, 324P. 3- EZIO BIGLIERI . ROBERT CALDERBANK . ANTHONY CONSTANTINIDES . ANDREA GOLDSMITH . AROGYASWAMI PAULRAJ . H. VINCENT POOR, R2007 - MIMO Wireless Communications , CAMBRIDGE UNIVERSITY PRESS CAMBRIDGE, 343P 4- Lei Zhao, R2015 - BEAMFORMING AND POWER ALLOCATION TECHNIQUES FOR MULTIUSER MIMO BROADCAST CHANNELS. HAL ARCHIVES-OUVERTES, France, 129P. 5- SUBUH PRAMONO . SUGIHARTONO, R2014 - DOWNLINK TRANSMIT BEAMFORMING FOR MULTIUSE-MIMO SYSTEM. ICTS 2014, SURABAYA, INDONESIA, 287-290 P. 6- CHEN SUN . JUN CHENG . TAKASHI OHIRA, R2008 - HANDBOOK ON ADVANCEMENTS IN SMART ANTENNA TECHNOLOGIES FOR WIRELESS NETWORKS. INFORMATION SCIENCE REFERENCE , HERSHEY , NEW YORK , 584P. 7- Fang Yuan . Chenyang Yang, R2012 - Equivalence of SLNR Precoder and RZF Precoder in Downlink MU-MIMO Systems, Cornell University library, 19 June 2012.
rate research
Read More
Several new technologies had been presented in LTE system
standards in order to achieve higher performance and more
reliability than Previous cellular communications systems. The
added new standards describe advanced technologies that integrated
into the system environment so that we can meet subscribers
Growing requirements. in this study we'll discuss in details the
different patterns of modulation schemes, which are adopted in (3
GPP) standards for (LTE) system downlink.
The employment of multiple antennas at the transmission and reception side for the
formation of a MIMO system contributed significantly to improve the reliability of
transmission and increase the data rate. In the last decade, this system represent
ed the
backbone of wireless communications which paved the way for the development of many
techniques in this area. Therefore, there is a need to study the most important of these
techniques and compare its performance analysis.
This research deals with several closed-loop MIMO techniques : (P-OSM) which
maximizes the minimum Euclidean distance in the received signal constellation in order to
reduce the bit error rate, (X and Y Precoders) which improve the diversity gain of MIMO
system. The aim is to study and analysis the performance of previous techniques in
practical scenarios of wireless communication systems in the presence of limited feedback
channel. The results shows the possibility of practical employment of the P-OSM
technique in a simple way compared to other techniques due to its good performance and
low complexity order.
This paper presents a method for finding online adaptive optimal
controllers for continuous-time linear systems without knowing the
system dynamical matrices. The proposed method employs one of
Intelligent Operations Research Techniques, this tech
nique is the
adaptive dynamic programming, to iteratively solve the algebraic
Riccati equation using the online information of state and input,
without requiring the a priori knowledge of the system dynamics. In
addition, all iterations can be conducted by using repeatedly the
same state and input information on some fixed time intervals. A
practical online algorithm is developed in this paper, and is applied
to the controller design for a turbocharged diesel engine with
exhaust gas recirculation.
Sentence weighting is a simple and powerful domain adaptation technique. We carry out domain classification for computing sentence weights with 1) language model cross entropy difference 2) a convolutional neural network 3) a Recursive Neural Tensor
Network. We compare these approaches with regard to domain classification accuracy and and study the posterior probability distributions. Then we carry out NMT experiments in the scenario where we have no in-domain parallel corpora and and only very limited in-domain monolingual corpora. Here and we use the domain classifier to reweight the sentences of our out-of-domain training corpus. This leads to improvements of up to 2.1 BLEU for German to English translation.
This paper explores character-driven story continuation, in which the story emerges through characters' first- and second-person narration as well as dialogue---requiring models to select language that is consistent with a character's persona and the
ir relationships with other characters while following and advancing the story. We hypothesize that a multi-task model that trains on character dialogue plus character relationship information improves transformer-based story continuation. To this end, we extend the Critical Role Dungeons and Dragons Dataset (Rameshkumar and Bailey, 2020)---consisting of dialogue transcripts of people collaboratively telling a story while playing the role-playing game Dungeons and Dragons---with automatically extracted relationships between each pair of interacting characters as well as their personas. A series of ablations lend evidence to our hypothesis, showing that our multi-task model using character relationships improves story continuation accuracy over strong baselines.
suggested questions
Log in to be able to interact and post comments
comments
Fetching comments
Sign in to be able to follow your search criteria
