نتایج جستجو برای: سیستم mimo

تعداد نتایج: 92460  

2012
Abbas Mohammadi Fadhel M. Ghannouchi

This practical resource offers a thorough examination of RF transceiver design for MIMO communications. Offering a practical view on MIMO wireless systems, this book extends fundamental concepts on classic wireless transceiver design techniques to MIMO transceivers. This helps reader gain a very comprehensive understanding of the subject. This in-depth volume describes many theoretical and impl...

2011
Sirichai Hemrungrote Toshikazu Hori Kentaro Nishimori

Multiple-Input Multiple-Output (MIMO) and Multi-User MIMO (MU-MIMO) systems are expected to improve the channel capacity over the limited bandwidth of existing wireless communication networks. The effects on the channel capacity characteristics of Single-User MIMO (SU-MIMO) systems in urban scenarios have been previously studied. In this paper, we first clarify that the larger number of antenna...

2009
Sami GHNIMI Ali GHARSALLAH

A blind Adaptive Space-Time Lifted Multiple-Input Multiple-Output (ASTL-MIMO) multiuser receiver is proposed for multipath MIMO channel estimation and multiuser detection of MIMO DS-CDMA systems in a realistic outdoor channel. An iterative and robust ASTL-MIMO Beamformer is employed to estimate the multipath MIMO channel parameters. For each iteration, the tracking mode with consideration of MI...

2009
Fang Shu Li Lihua Zhang Ping

A general stochastic spatial MIMO channel model is proposed for evaluating various MIMO techniques in this paper. It can generate MIMO channels complying with various MIMO configurations such as smart antenna, spatial diversity and spatial multiplexing. The modeling method produces the stochastic fading involving delay spread, Doppler spread, DOA (direction of arrival), AS (angle spread), PAS (...

2001
Bojan Vrcelj P. P. Vaidyanathan

Channel equalization is an important step in most applications of digital communications. In this paper we consider the equalization of Multiple Input Multiple Output (MIMO) channels. To that end we derive the theory of MIMO biorthogonal partners, a concept that has already been introduced (only in the scalar case) by the authors. We develop conditions for the existence of an FIR MIMO biorthogo...

2003
André L. F. de Almeida João C. M. Mota Francisco R. P. Cavalcanti

In this work we assess performance of multiple-input multiple-output (MIMO) antenna systems with space-time processing over a frequency-selective channel in presence of time-dispersive co-channel interference. We evaluate the performance of the conventional MIMO-decision-feedback equalizer (MIMO-DFE) receiver and also propose a low complexity receiver, based on the decoupled interference cancel...

2008
Somayeh Mahmoodi

in this paper we try to review recent works on optimal training sequence design for MIMO and MIMO OFDM systems. We also classify these works, according to assuming MIMO channel model, into two main categories. First, works that assume MIMO channel are independent identically distributed. Second group assumes MIMO channel are correlated. Simulation results are presented. It has been illustrated ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید باهنر کرمان - دانشکده برق و کامپیوتر 1391

یکی از بهترین روش?های پیشنهاد شده برای مقابله با پدیده ی محوشدگی سیگنال ها در کانال های مخابرات بیسیم، استفاده از ساختار mimo است. یکی از موفق?ترین روش?های mimo ساختار کدگذاری مکان-زمان است. در این روش کدگذاری، سیگنال های ارسالی به کمک دو یا چند آنتن ارسالی(مکان) و در زمان های مختلف(زمان) ارسال می شوند. مسئله محوشدگی وقتی بیشتر خود را نشان می دهد که نرخ ارسالی افزایش می یابد، که در این حالت، په...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده مهندسی برق و کامپیوتر 1394

برای آنکه سمبل های ارسال شده به درستی در گیرنده آشکار شود، نیاز به شناخت کانال داریم، لذا شناخت و تخمین کانال در طراحی سیستم های mimo-ofdm نقش مهمی دارد. روشی که در این پژوهش برای تخمین کانال‏ های mimo-ofdm معرفی شده است تکنیک موسوم به rvm است. rvm یک تکنیک یادگیری ماشین است که از استنتاج بیزین برای دستیابی به راه حل های با حجم محاسباتی کم برای مسائل رگرسیون و دسته بندی استفاده می کند. در این ر...

2011
Noureddine Boujnah Leyla Issaoui

MIMO(Multiple Input Multiple Output) technology was found to exploit the channel richness and spatial diversity, its possible to increase data throughput and reduce the error probability[1]. MIMO channel capacity was derived by Teletar in [2], MIMO find its application in many technology such as HSPA and WLAN. Recent research were devoted to applicability of MIMO to satellite communication and ...

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