Interference
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SBrT’11 - Tutorial on Interference alignment in wireless networksWalter C. Freitas Jr., Yuri C. B. Silva, Charles C. Cavalcante Wireless Telecom Research Group (GTEL) October 2nd, 2011
Walter, Yuri, Charles (GTEL)
SBrT’11 - Interference alignment
October 2nd, 2011
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Revisiting MIMO
Contents
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Revisiting MIMO Interference management in wireless networks Interference alignment in wireless networks Challenges and research directions References
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Walter, Yuri, Charles (GTEL)
SBrT’11 - Interference alignment
October 2nd, 2011
2 / 87
Revisiting MIMO
MIMO Systems (Multiple Input Multiple Output)
What they are?
MIMO: use of techniques of multiple transmit and receive antennas to improve throughput and/or reliability MIMO in communication networks: given power, bandwidth, density of cells, how MIMO is used to maximize cell throughput (bps/Hz/m2 )?
Walter, Yuri, Charles (GTEL)
SBrT’11 - Interference alignment
October 2nd, 2011
3 / 87
Revisiting MIMO
MIMO Systems - cont.
Wireless Systems
Wide-band systems
high spectral efficiency; different (and high) QoS requirements; large coverage.
Wireless channel
fading; co-channel interference; path-loss; spectrum and transmit power constraints.
Walter, Yuri, Charles (GTEL)
SBrT’11 - Interference alignment
October 2nd, 2011
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Revisiting MIMO
MIMO Systems - cont.
Scenarios
Single-user MIMO
Multiuser MIMO
Figura: Scenarios of MIMO applications.
Walter, Yuri, Charles (GTEL)
SBrT’11 - Interference alignment
October 2nd, 2011
5 / 87
Revisiting MIMO
MIMO Systems - cont.
Types of gains in MIMO systems
Diversity gain: multiple copies of the transmitted stream are sent by the different channels; improve reliability (robustness) and range; may reduce required power Spatial multiplexing (SM) gain: multiple streams sent and distinguished at receiver based on spatial characteristics; increase