نتایج جستجو برای: multiple input multiple output mimo systems

تعداد نتایج: 2109398  

2014
Dong-Hyun Ha Ki-ro Kim Hyoung-Kyu Song

Recently, cooperative system is an interesting issue in communication systems. Single mobile antenna can have transmission diversity gain by the cooperative system as multiple input multiple output (MIMO) system. However, the most of the cooperative systems have a problem about the transmission rate loss. In this paper, hierarchical modulation is proposed in order to solve the transmission rate...

Journal: :EURASIP J. Wireless Comm. and Networking 2007
Konstantinos P. Liolis Athanasios D. Panagopoulos Panayotis G. Cottis

This paper investigates the applicability of multiple-input multiple-output (MIMO) technology to satellite communications at the Ku-band and above. After introducing the possible diversity sources to form a MIMO matrix channel in a satellite environment, particular emphasis is put on satellite diversity. Two specific different topics from the field of MIMO technology applications to satellite c...

Journal: :IEEE Trans. Signal Processing 2003
Huaiyu Dai H. Vincent Poor

In this paper, the spectral efficiency of multiple-input multiple-output (MIMO) systems operating in multicell frequencyflat fading environments is studied, for situations in which co-channel interference is the dominant channel impairment instead of ambient noise. The following detectors are analyzed: the joint optimum detector, a group linear minimum-meansquare-error (MMSE) detector and its g...

2009
Sang-Do Lee Young-Chai Ko

In this paper, we propose a hybrid M -ary Quadrature Amplitude Modulation (M -QAM) transmission scheme that jointly uses adaptive modulation and selection combining for singular value decomposition (SVD)-based multiple-input multiple-output (MIMO) systems (AMSC-MIMO). We derive exact closed-form expressions of the performance of the proposed scheme in terms of the average spectral efficiency an...

Journal: :IEEE Journal on Selected Areas in Communications 2003
Persefoni Kyritsi Donald C. Cox Reinaldo A. Valenzuela Peter W. Wolniansky

Multiple-input–multiple-output (MIMO) systems have the potential to achieve very high capacities, depending on the propagation environment. Capacity increases as signal correlation decreases. We present the measurements of a MIMO system under strong and weak line-of-sight conditions. The system capacity decreases as the distance from the transmitter increases. Indeed the transmitter correlation...

2009
Wei Peng Fumiyuki Adachi

The capacity performance of multi-user multiple input multiple output (MIMO) in a cellular system is of a great interest. This paper presents a comparative study on the transmit power control (TPC) schemes for uplink multi-user MIMO systems. Two kinds of TPC schemes, namely, zero-outage TPC and minimum interference TPC, are considered. The capacities of both schemes are theoretically analyzed a...

2010

This article describes a repeatable reference environment for over-the-air (OTA) testing of multiple input multiple output (MIMO) devices and why the reverberation chamber is uniquely suited to provide insight into MIMO device performance. The importance of reference environments and the characteristics of the reverberation chamber in the context of 4G wireless systems are reviewed. Statistical...

Journal: :IEEE Transactions on Wireless Communications 2021

In this paper, we consider the uplink and downlink precoder design for two-user power-domain multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) systems. We propose novel precoding decoding schemes that lower complexity at receiver by decomposing MIMO-NOMA channels of users into single-input single-output (SISO)-NOMA via simultaneous triangularization (ST) MIMO a low-com...

2001
Darren McNamara Mark A. Beach Paul N. Fletcher

The measurement and characterisation of multiple-input multiple-output (MIMO) channels has gained increasing attention over recent years. Previous analysis of MIMO measurements has generally focussed on the evaluation of the capacity of such systems in differing locations and configurations. In this paper we present measurements made in an indoor environment at 5.2GHz, specifically to investiga...

2014
Pallavi Amita Soni

In this paper, an effort has been made to illustrate the performance of MIMO system under the effect of transceiver impairments on channel capacity with varying antenna element. The capacity of ideal MIMO channels depends upon number of antenna used in antenna array. At small SNR values capacity increases linearly. When there are distortions from physical transceiver impairments MIMO channels h...

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