MIMO Wireless Communication (original) (raw)
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Design of MIMO Space-Time Code for High Data Rate Wireless Communication
International Journal
Multiple-input and multiple-output, or MIMO, is the use of multiple antennas at both the transmitter and receiver to improve communication performance. MIMO technology has attracted attention in wireless communications, because it offers significant increases in data throughput and ...
Design of MIMO Space-Time Code for High Data Rate Wireless Communication ABSTRACT
2013
Multiple-input and multiple-output, or MIMO, is the use of multiple antennas at both the transmitter and receiver to improve communication performance. MIMO technology has attracted attention in wireless communications, because it offers significant increases in data throughput and link range without additional bandwidth or transmit power. In this paper, multiple-input–multiple-output (MIMO) systems with reduced complexity is considered. The space–time block coding, for communication over Rayleigh fading channels using multiple transmit antennas is considered. Also the Alamouti code is tested for the performance. Data is encoded using a space–time block code and the encoded data is split into n streams which are simultaneously transmitted using n transmit antennas. The received signal at each receive antenna is a linear superposition of the n transmitted signals perturbed by noise. In current research, high data rate wireless communications, transmission rates, is of major interest....
Special Issue: Multiple-Input Multiple-Output (MIMO) Communications
Wireless Communications and Mobile Computing, 2004
The idea of using multiple transmit and receive antennas in wireless communication systems is one of the most important breakthroughs in communication theory during the last decade. Popularly referred to as MIMO technology, this concept can greatly improve data throughput and link performance in wireless networks. In principle, a MIMO system can operate in, or anywhere between, one of the two possible modes. If the transmitter knows the channel, then one can use spatial beamforming techniques to steer RF energy in the direction of the receiver. On the other hand, if the transmitter does not know the channel, one can use space-time coding which effectively distributes the transmitted power uniformly in all directions, and in addition augments the data with structure that can be used to combat from fading dips. Sometimes, space-time coding methods are grouped into two categories: those that focus on throughput improvement (e.g. Bell-Labs layered space-time architecture, BLAST), and those that solely aim at improving link performance (including, most notably, orthogonal block coding and transmit diversity schemes); however, this classification is simplistic and many of the currently best known schemes do not fall under any of these two groups.
SPACE TIME CODING FOR MIMO SYSTEMS
With space-time codes (STC) the same information is transmitted in appropriate manner simultaneously from different transmit antennas to obtain transmit diversity. The main idea of transmit diversity is that if a message is lost in a channel with probability p and we can transmit replicas of the message over n independent such channels, the loss probability becomes p n . Using diversity, more reliability is given to the symbols which allows employing higher order constellation resulting in higher throughput.
Space Time Block Codes for MIMO systems: History to Recent Developments
2015
Multi Input Multi Output (MIMO) communication is a proven technique to increase the throughput, diversity gain and increase the energy gain by reducing the energy consumption of the wireless network. Space time diversity used in MIMO systems is a technique to mitigate multipath fading. The same information is transmitted over multiple channels that fade independently. So, space time diversity is achieved. Transmit space time diversity is achieved if the transmitter has knowledge of the channel. But, if the transmitter does not know the channel then it is necessary to code across both space and time to achieve diversity which is termed as space time coding. In this article, we discuss the developments in MIMO systems and Space Time Block Coding Techniques for MIMO systems, over the years.
Space Time Block Coding and MIMO Channels:Performance Results
SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology, 2015
We analyse the Space-time Block coding for wireless communication and present an overview of applying MIMO concept and shows how it improves the SNR without decreasing data rates. It provides a new paradigm for transmission over Raleigh fading channel using multiple transmit antennas. Data is encoded using a space time block code and the encoded data is split into n streams which are simultaneously transmitted using n transmit antennas. Maximum likelihood decoding is achieved in a simple way through decoupling of the signals transmitted from different antennas rather than joint detection. This uses the orthogonal structure of the space time block code and gives a maximum likelihood decoding algorithm which is based only on linear processing at the receiver. We review the encoding and decoding algorithms for various codes and provide simulation results demonstrating their performance. It is shown that using multiple transmit antennas and space-time block coding provides remarkable pe...
Anais do XXV Simpósio Brasileiro de Telecomunicações, 2007
In this paper we present efficient MIMO transceiver architectures evaluated in a multiuser environment. In this context we consider traditional MIMO transmit structures and also hybrid ones proposed in [6] capable of achieve diversity and multiplexing gains. Our results shown that in a multiuser environment the MIMO transmit structures of the desired user has a crucial impact in the performance due the diversity orders of the multiple layers in the MIMO structure.
Space time Block codes for MIMO Systems
2015
Data is encoded using a space–time block code and the encoded data is split into n streams which are simultaneously transmitted using n transmit antennas. The received signal at each receive antenna is a linear superposition of the n transmitted signals perturbed by noise. The wireless systems that is evolved the last few decades necessitates in the design and analysis of equalization techniques. Future generation of wireless system is supposed to possess very high spectral efficiency. When data is transmitted at high rates over mobile radio channels, impulse response can extend over many symbol periods which lead to Inter Symbol Interference. Space– time block codes [STBC] are designed to achieve the maximum diversity order for a given number of transmit and receive antennas subject to the constraint of having a simple decoding algorithm. In this paper, we present the performance analysis of Alamouti STBC and MIMO Equalization. Compare MIMO -STBC with SISO, MRC and 2x1 and 2x2 Alam...