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Overview of MIMO systems

Overview of MIMO systems

4 receiver design 4.2

4 receiver design 4.2 Non linear receiver (ML, SIC) Maximum likelihood receiver: • Optimum detection • Exhaustive search. No iterative procedure for MIMO. • Complexity exponential in QAM order and N. ⎡ ⎢ x x h h h h S S ⎤ 1 ⎤ 11 12 ⎤ .. 1 ⎡ ⎡ = + ⎥ ⎢ .. ⎥ 2 21 22 2 ⎥ N ⎢ : : : : : ⎢ ⎥ ⎢ ⎥ ⎢ ⎥ ⎣ ⎦ ⎣ ⎦ ⎣ ⎦ Maximum Likelihood Solution: Ŝ = argmin Ix – Hsl² where s is searched over the modulation alphabet (e.g. 4QAM, 16QAM..) SIC : Successive Interference Canceling SMARAD / Radio Laboratory 19 4 receiver design 4.3 Performance comparison BLAST zero-forcing vs. V-BLAST (SIC) vs BLAST-ML (2x2) SMARAD / Radio Laboratory 20

4 receiver design BLAST zero-forcing vs. V-BLAST (SIC) vs BLAST-ML (4x4) SMARAD / Radio Laboratory 21 5 Space-Time Coding (Transmit / Receive Diversity) 5 Space-Time Coding (Transmit/Receive Diversity) Uses Transmission diversity to combat the detrimental effects in wireless fading channels. Three types: •Trellis space time codes : complex but best performance in slow fading environment (indoors). •Layered space time codes : easy to implement but not accurate due to error propagation effect. •Block space time codes : best trade-off of performance vs complexity. SMARAD / Radio Laboratory 22

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