Lec10_MU-MIMO_11ac - IEEE 802.11ac Instructor Dr Wei(Lisa Li Computer Science GSU [email protected] NEW IEEE 802.11ac SPECIFICATION DRIVEN BY EVOLVING

Lec10_MU-MIMO_11ac - IEEE 802.11ac Instructor Dr Wei(Lisa...

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IEEE 802.11ac Instructor: Dr. Wei (Lisa) Li Computer Science, GSU [email protected]
NEW IEEE 802.11ac™ SPECIFICATION DRIVEN BY EVOLVING MARKET NEED FOR HIGHER, MULTI-USER THROUGHPUT IN WIRELESS LANS 2
IEEE 802.11ac Key Features Lots of things are the same as 802.11n All about capacity, not coverage Multiuser MIMO (MU-MIMO) Simultaneous beams to multiple stations/users Up to 8 × 8 MIMO 5-GHz only operation Up to 160 MHz (8 × 20 MHz channels) Speed up to 6.937 Gbps 3
802.11ac vs. 802.11n 4 802.11ac 802.11n Supports 8x8 MIMO Supports 4x4 MIMO Adds 80 and 160 MHz channels Supports 20 and 40 MHz Supports 5 GHz frequency bands only Supports both 2.4 GHz and 5 GHz frequency bands Supports multi-user transmission Supports single-user transmission only
IEEE 802.11n vs. 802.11ac 5 Three-Fold Improvement: 1. A 8x8 MIMO 2. A doubling of channel bandwidth to 160 MHz 3. A more efficient 256QAM encoding technique
Single-user vs. Multi-user MIMO 6
MU-MIMO in 802.11ac 7 An AP can simultaneously support up to 8 spatial data streams for multiple users
OFDM in IEEE 802.11 8
Application of 802.11ac 9

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