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Overview of MIMO systems

Overview of MIMO systems

1 Presentation

1 Presentation Multiple-Input Multiple-Output (MIMO) Wireless Systems 1.1 What are MIMO systems ? • A MIMO system consists of several antenna elements, plus adaptive signal processing, at both transmitter and receiver • First introduced at Stanford University (1994) and Lucent (1996) • Exploit multipath instead of mitigating it SMARAD / Radio Laboratory 3 1 Presentation 1.2 Wireless channels limitations Wireless transmission introduces: Fading: multiple paths with different phases add up at the receiver, giving a random (Rayleigh/Ricean) amplitude signal. ISI:multiple paths come with various delays, causing intersymbol interference. CCI: Co-channel users create interference to the target user Noise: electronics suffer from thermal noise, limiting the SNR. SMARAD / Radio Laboratory 4

1 Presentation Wireless channels limitations : summary SMARAD / Radio Laboratory 5 1 Presentation 1.3 MIMO Benefits : • higher capacity (bits/s/Hz) (spectrum is expensive; number of base stations limited) • better transmission quality (BER, outage) • Increased coverage • Improved user position estimation Due to : Spatial multiplexing gain : Capacity gain at no additional power or bandwidth consumption obtained through the use of multiple antennas at both sides of a wireless radio link Diversity gain : Improvement in link reliability obtained by transmitting the same data on independently fading branches Array gain Interference reduction SMARAD / Radio Laboratory 6

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