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Overview of MIMO systems

Overview of MIMO systems

2 SISO Vs

2 SISO Vs MIMO Comparison : Average capacity of ideal MIMO systems SMARAD / Radio Laboratory 11 3 Spatial multiplexing 3 Spatial multiplexing 3.1 Principle We send multiple signals, the receiver learns the channel matrix and inverts it to separate the data. SMARAD / Radio Laboratory 12

3 Spatial multiplexing Example for 3x3: ⎡ h h h x x 1⎤ ⎡ 11 12 13⎤ ⎡ h h h b b 1⎤ ⎢ 2⎥= ⎢ 21 22 23⎥ ⎢ 2⎥+ Noise ⎢⎣ x3⎥⎦ ⎢⎣ h31h32h33⎥⎦ ⎢⎣ b3 ⎥ ⎦ ⎡bˆ ⎢ bˆ ⎢ ˆ ⎢b ⎣ 1 2 3 ⎤ ⎥ = ⎥ ⎥⎦ ⎡x ⎢x ⎢⎣ x Η − 1 1 2 3 ⎤ ⎥ ⎥⎦ SMARAD / Radio Laboratory 13 3 Spatial multiplexing 3.2 Impact of channel model MIMO Performance is very sensitive to channel matrix invertibility. The following degrades the conditioning of the channel matrix: Antenna correlation caused by: - Small antenna spacing, or - Small angle spread Line of sight component compared with multipath fading component : - Multipath fading component, close to random identical independent distribution, is well conditioned - Line of sight component is very poorly conditioned. SMARAD / Radio Laboratory 14

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