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Description MULTIPLE INPUT MULTIPLE OUTPUT SYSTEMS (MIMO). By MOHAMMED BERHEA. 1. Introduction. MIMO Systems: use multiple inputs and multiple outputs from a single channel are defined by Spatial Diversity and Spatial Multiplexing. Spatial Diversity and Spatial Multiplexing. Spatial Diversity
Share Transcript MULTIPLE INPUT MULTIPLE OUTPUT SYSTEMS (MIMO) By MOHAMMED BERHEA 1. Introduction MIMO Systems: use multiple inputs and multiple outputs from a single channel Makalah Input & Output.docx are defined by Spatial Diversity and Spatial Multiplexing (/makalah-input-output-docx) Spatial Diversity and Spatial Multiplexing Spatial Diversity Signal copies are transferred from multiple antennas or received at more than one antenna Makalah Input & Output redundancy is provided by employing an array of antennas, with a minimum separation of /2 (/makalah-input-output) between neighbouring antennas Spatial Multiplexing the system is able to carry more than one data stream over one frequency, simultaneously Multiple-Output, Variable-Output Why MIMO? DC Power Supply - Phase 2 May There is always a need for increase in performance in wireless systems 04-08 (/multiple-output-variableSignificant increase in spectral efficiency and data rates output-dc-power-supply-phaseHigh Quality of Service (QoS) Input and Output Statements 2-may-04-08) Wide coverage, etc. (/input-and-output-statements) Wireless channel that we are using is very unfriendly Suffers from Co–channel interference and signal level fading It provides a limited bandwidth From input to output (/frompower falls off with distance input-to-output) MIMO System solutions By using Multiple Output Multiple Input (MIMO) systems Diversity gain mitigates the fading and increases coverage and improves QoS Feedback Methods for MultipleMultiplexing gain increases capacity and spectral efficiency with no additional power or Input Multiple-Output Wireless bandwidth expenditure Systems (/feedback-methodsArray gain results in an increase in average receive SNR. for-multiple-input-multipleSpatial Diversity and Spatial Multiplexing can be conflicting goals Chapter 7 Input and Output output-wireless-systems) Spatial Multiplexing (/chapter-7-input-and-output) MIMO channels can be decomposed into a number of R parallel independent channels Õ Multiplexing Gain Principle: Transmit independent data signals from different antennas to increase the throughput, Input and Output (/input-andcapacity. output) Source: An Overview of MIMO Systems in Wireless Communications www.iet.ntnu.no/projects/beats/Documents/mimo.pdf MEMO capacity on fading channels The capacity increase can be seen by comparing MEMO systems with SISO, SIMO, and MISO Multiple Choice (/search/multiple+choice) Input/Output (/search/input+output) Input and output devices (/inputsystems and-output-devices) SISO:capacity is given by Shannon’s classical formula: Where B is the BW and h is the fading Multiple Sclerosis (/search/multiple+sclerosis) gain SIMO (with M transmitting antennas), the capacity is given by [2] Code Division Multiple Access (/search/code+division+multiple+access) Input & Output Systems (/inputMISO (with M transmitting antennas), the capacity is given by [2] output-systems) Multiple Myeloma (/search/multiple+myeloma) MEMO capacity on fading channels The capacity for MIMO systems can have the following forms (Assuming Tx antennas = Rx Input–Output Model (/search/input+output+model) Multiple Births (/search/multiple+births) antennas = N): A) If the channel is not known at the transmitter: Lecture 11 Input Output Systems Where Es is the total power, 2 is noise level of AWGN Multiple Comparisons Problem (/search/multiple+comparisons+problem) (/lecture-11-input-outputHence the power is equally shared by each channel systems) The capacity grows linearly with the number of antennas B) If the channel is known at the Multiple Drug Resistance (/search/multiple+drug+resistance) transmitter The potential of time reversal in MEMO capacity on fading channels Systems Theory (/search/systems+theory) multiple antenna systems (/theWith the channel known at the transmitter, the total power allocation the each channel will be potential-of-time-reversal-inbased on watterfilling. multiple-antenna-systems) Watterfilling: Strong Sub-channel, with low noise power level will be assigned with a higher WEQ EC Scoping Task Force on signal power. Where N2 = 2 / hn2 Coordination of Service Across Illustrating Watterfilling Source: MIMO Systems and Transmit Diversity, Multiple Transmission Systems www.comm.utoronto.ca/~rsadve/Notes/DiversityTransmit.pdf Average capacity of a MIMO (/weq-ec-scoping-task-force-onRayleigh fading channel [] Source: Space-time Diversity Codes for Fading Channels, [3] Spatial coordination-of-service-acrossOrigin Scenarios for Multiple Diversity multiple-transmission-systems) Planet Systems (/originImproves the signal quality and achieves a higher SNR at the receiver-side scenarios-for-multiple-planetPrinciple of diversity relies on the transmission of structured redundancy systems) yi xi MIMO Diversity and Reliability Screening for Co-occurring The performance improvement in SNR and error probability for MIMO can be compared with Disorder: Experience SISO, SIMO, and MISO Implementing it in Multiple The detailed calculation for SNR and Pe is shown in [1] Regional Systems (/screeningSISO: for-co-occurring-disorderReceive Diversity (SIMO): View more... experience-implementing-it-inand and MIMO Diversity and Reliability (/search/MULTIPLE+INPUT+MULTIPLE+OUTPUT+SYSTEMS+MIMO) multiple-regional-systems) The values for SNR and Pe for: Transmit Diversity (MISO): Proposed DoD Financial Management Professional Certification Program Telomerase and the consequence of telomere dysfunction Transmit/Receive Diversity (MIMO): Presented to the ASMC Audio Conference (/proposed-dod-financialThe received signal at antenna i will be: management-professional-certification-program-presented-to-the-asmcH is the channel fading matrix