MIMO in-depth

2 days

Download brochureMultiple-Input Multiple-Output (MIMO) is the family of techniques of key importance to many contemporary and future wireless systems, including 3GPP LTE, LTE Advanced, WiMAX and eHSPA. This course provides an in-depth explanation of MIMO methods, starting from the basics and going to such advanced aspects like beamforming, spatial multiplexing and combination with OFDM. The course provides a detailed description of all the MIMO schemes including single-user MIMO, multi-user MIMO, open-loop and closed-loop MIMO.

The course utilizes a number of hands-on practical exercises using the state-of-the art LTE PHY Lab and WiMAX PHY Lab – Link Level Simulators applied to observe MIMO signals and waveforms generated by either LTE or WiMAX base stations.

Radio Propagation Overview and Antenna Fundamentals

• Propagation in dispersive multipath channels
• Basic antenna characteristics (time, frequency and angular spread)
• Vertical, horizontal and circular polarization of electromagnetic wave
• Basic antenna structures (isotropic and dipole), their characteristics and parameters
• Sector antenna pattern, influence of down-tilting
• Line-of-sight and non-line-of-sight propagation

Spatial Diversity Methods

• Three domains for providing diversity (time, frequency and space)
• Diversity combining schemes: MRC for receive diversity, Alamouti for transmit diversity and selection combining for both
• Combination of spatial diversity (RAKE receiver and cyclic delay diversity)
• Use of space time coding (STBC, STTC)

Beamforming

• Fundamentals of creating adaptive antenna patterns
• Transmit and receive beamforming (DoD and DoA)
• Physical vs. mathematical beamforming
• Switched multibeam vs. adaptive antenna array
• Optimal usage of beamforming (desired signal
• enforcement, interference suppression or cancellation)
• Combination of beamforming with spatial diversity or spatial multiplexing
• Practical examples of range increase

Spatial Multiplexing

• Basic idea of creating independent spatial channels
• General mathematical model for spatially multiplexed channels
• Encoder and decoder for Horizontal Layered Space (H-BLAST)
• Encoder and decoder for Vertical Layered Space (V-BLAST)
• Encoder and decoder for Diagonal Layered Space (D-BLAST)
• Spatial multiplexing with feedback (closed loop)
• Water-filling concept in closed loop MIMO
• Zero-forcing receiver and singular value decomposition (SVD)

MIMO in Multiple-user Scenario

• Extension of spatial multiplexing concept to multiple-user scenarios
• Classification of multiple-user scenarios for MIMO usage
• 3-dimensional scheduling in LTE system
• Coordinated MIMO transmission from more than one base station

Combination of MIMO with OFDMA and SC-FDMA

• OFDMA and SC-FDMA as the key transmission techniques for current broadband systems
• MIMO-related synchronization and channel estimation aspects
• Combination of STBC and OFDMA
• Combination of SM/BF and OFDMA
• Possible allocations of transmit diversity and spatial multiplexing
• Receive beamforming with SC-FDMA

MIMO Applied in the Major Standards

• MIMO in 3GPP Rel. 8, Rel. 9 and Rel. 10 E-UTRAN
• MIMO in IEEE 802.16e
• MIMO in eHSPA