نتایج جستجو برای: رادار mimo

تعداد نتایج: 19095  

2013
Kelvin O. O. Anoh R. A. Abd-alhameed J. M. Noras S. M. R. Jones S. Galli H. Koga N. Kodama M. Hoch S. Heinrichs

An investigation into the wavelet packet transform (WPT) modulation scheme for Multiple Input Multiple Output (MIMO) band-limited systems is presented. The implementation involves using the WPT as the base multiplexing technology at baseband, instead of the traditional Fast Fourier Transform (FFT) common in Orthogonal Frequency Division Multiplexing (OFDM) systems. An investigation for a WPT-MI...

Journal: :IEEE Trans. Signal Processing 2002
Bojan Vrcelj P. P. Vaidyanathan

Multiple InputMultiple Output (MIMO) biorthogonal partners arise in many different contexts, one of them being multiwavelet theory. They also play a central role in the theory of MIMO channel equalization, especially with fractionally spaced equalizers. In this paper we first derive some theoretical properties of MIMO biorthogonal partners. We develop conditions for the existence of MIMO biorth...

2011
Charan Langton Bernard Sklar Gerard Foschini

When multiple input/multiple output (MIMO) systems were described in the mid-to-late 1990s by Gerard Foschini and others, [1] the astonishing bandwidth efficiency of such techniques seemed to be in violation of the Shannon limit. But, there is no violation because the diversity and signal processing employed with MIMO transforms a point-to-point single channel into multiple parallel or matrix c...

Journal: :IEEE Trans. Information Theory 2003
Sriram Vishwanath Nihar Jindal Andrea J. Goldsmith

Abstract— We consider a multi-user multiple input multiple output (MIMO) Gaussian broadcast channel (BC), where the transmitter and receivers have multiple antennas. Since the MIMO broadcast channel is in general a non-degraded broadcast channel, its capacity region remains an unsolved problem. In this paper, we establish a duality between what is termed the “dirty paper” achievable region (the...

2015
Ertuğrul Başar

Multiple-input multiple output orthogonal frequency division multiplexing with index modulation (MIMO-OFDMIM) is novel multicarrier transmission technique which has been proposed recently as an alternative to classical MIMO-OFDM. In this scheme, OFDM with index modulation (OFDM-IM) concept is combined with MIMO transmission to take advantage of the benefits of these two techniques. In this work...

Journal: :IEICE Transactions 2013
Keita Ushiki Kentaro Nishimori Naoki Honma Hideo Makino

Intruder detection method by utilizing a time variation of Multiple Input Multiple Output (MIMO) channel (MIMO Sensor) has been proposed. Although the channel capacity on the MIMO transmission is severely degraded in time variant channels, we can take advantage of this feature in MIMO Sensor applications. We have already demonstrated the effectiveness of 2×2 MIMO sensor using 2.4 GHz band at a ...

2003
Ali Abdi Chunjun Gao Alexander M. Haimovich

In this paper, important dynamic characteristics of MIMO mobile fading channels such as the level crossing rate (LCR) and average fade durations (AFD) are studied. Depending on the application, either a scalar crossing approach or a vector crossing approach is taken, and appropriate definitions for LCR and AFD in MIMO channels are provided. The more general concept of average stay duration (ASD...

2014
Konstantinos Maliatsos Panagiotis N. Vasileiou Athanasios G. Kanatas

Beamspace MIMO (BS-MIMO) systems have been recently proposed as a means to address the two key weaknesses of conventional MIMO systems: the antenna size and the need for multiple RF chains. BS-MIMO transmission is supported by the Electronically Steerable Passive Array Radiators (ESPAR) with a single active and multiple parasitic elements. The main objective is to develop efficient MIMO multipl...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز - دانشکده کشاورزی 1391

بارش یکی از مهمترین فرآیند های هیدرولوژیکی می باشد .از بارزترین مسائل مورد بررسی آن، مقدار بارش و همینطور توزیع مکانی آن می باشد. روشهای مرسوم که برای بررسی بارش مورد استفاده قرار می گیرند، معمولا مبتنی بر ایستگاههای ثبت بارش اقلیم شناسی، سینوپتیک زمینی و باران سنج ها بوده و دارای مشکلاتی از قبیل هزینه بربودن، عدم قابلیت اندازه گیری بارندگی منطقه ای به علت کمبود ایستگاه و توزیع نامناسب مکانی آن...

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