Course Number: 204
Length: 2 Days
802.11ac Training , IEEE 802.11ac-2013, Very High Throughput (VHT)
802.11ac Training, IEEE Standard: Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications, Amendment 4: Enhancements for Very High Throughput (VHT).
802.11ac adds:
- Channel bandwidths of 80 MHz and 160 MHz: both contiguous and non-contiguous 160 MHz channels for flexible channel assignment. I
- Higher order modulation in the form of 256 quadrature amplitude modulation (QAM), 33-percent improvement in data rate
- New technology to support multiple concurrent downlink transmissions: “multi-user multiple-input, multiple-output” (MU MIMO)
- More efficient spectrum use, higher system capacity and reduced latency
- 4 simultaneous user transmissions.
The IEEE 802.11ac amendment streamlines the existing transmit beamforming mechanisms and is increasing the adoption of the technology across devices. Transmit beamforming is a valuable technology that significantly improves coverage, reliability and data rate performance.
More than 300 individuals from equipment and silicon suppliers, service providers, systems integrators, consultant organizations and academic institutions from more than 20 countries participated in IEEE 802.11ac’s development.
TONEX offers the world’s first 802.11ac Training Course covering the fundamentals of 802.11ac, VHT, basic concepts, key features, operations, configurations, protocols, details of PHY, MAC, Security, Interference, QoS and more.
Next generation of Wireless LAN technology , 5th generation of Wi-Fi (5G WiFi), or 802.11ac standard, 5th Generation (5G) Wi-Fi breakthrough, aims to increase data rates to the region of 1Gbit/s by using wider channels compared to 802.11n such as 80MHz and 160MHz channels.
802.11ac (5G WiFi) changes and Enhancements are:
- Wider channels (up to 160 MHz)
- Higher-order modulation (256QAM Modulation)
- More spatial streams and antennas (up to 8)
- Multi-user MIMO
802.11ac will support up to 160MHz channel bonding and up to 8 spatial streams.. Up to 8 MIMO spatial streams may be possible and includes higher order modulation such as 256QAM and will be situated in the 5GHz band.
Who Should Attend
All those who require a technical understanding of 802.11ac.
Objectives
Upon completion of this course, the participant will:
- Understand the fundamental concepts of 802.11ac
- Understand the core concepts on 802.11ac PHY and MAC layers
- Understand MAC modifications
- Understand ideas behind MIMO spatial streams
- List Multi-user MIMO (MU-MIMO) features
- Understand Modulation and Other elements/features behind 802.11ac
- List Coexistence mechanisms for 20/40/80/160 MHz channels, 11ac and 11a/n devices
- List scenarios and configurations
Outline
Introduction to 802.11ac
- What is 802.11ac?
- 802.11ac Standard
- IEEE 802.11ac-2013
- High Speed WiFi
- VHT (Very High Throughput)
- 802.11ac Key Requirements
- Compatibility Issues
- Enhancements for Very High Throughput for operation in bands below 6GHz
- Operation in the 5 GHz spectrum
- 802.11ac MAC
- 802.11ac PHY
- Different modulation types (BPSK, QPSK, 16QAM, 64QAM and 256QAM)
- Different bandwidths (20 MHz, 40 MHz, 80 MHz and 160 MHz)
- 20, 40, and 80 MHz Channels
- The use of 160 MHz Channels
- Configurable frame length
- OFDM signal and 4x4 MIMO
- RF channel Issues
- RF Channel Performance
802.11ac Core Concepts
- IEEE 802.11ac-2013 Usage Models
- Feature Requirements and Evaluation Methodology
- Channel Model
- Specification Framework
802.11ac Key Requirements
- Backwards Compatibility
- Coexistence
- Single-STA (station) throughput
- MAC Service Access Point (SAP)
- Multi-STA throughput (measured at the MAC SAP)
802.11ac PHY
- Channelization
- OFDM Structure in both time and frequency domain
- From Bandwidth to OFDM Subcarriers
- Subcarriers per 11ac Transmission Bandwidth
- Subcarrier Rotation per Signal Bandwidth
- OFDM Symbol Characteristics of a 802.11ac signal
- Long and Short Cyclic Prefix
- Signal Bandwidth
- FFT Length
- Cyclic Prefix Length
Frame Format
- VHT Mixed Format PPDU
- VHT Preamble fields in detail
- VHT SIG-A
- VHT STF
- VHT LTF
- VHT SIG-B
802.11ac Data Field for Single User with BCC
- 802.11n Modulation
- 802.11n Interleaving
- 802.11n Coding Architecture
- 11ac Single User MCS Indices
802.11ac MAC
- MAC Changes in 802.11ac
- MAC-layer Aggregation
- Frame aggregation
- A-MSDU vs. A-MPDU
- RTS/CTS Operation
- RTS/CTS with Bandwidth Indication
- MAC Framing
- Management Frames
- Medium Access Procedures
- Clear-Channel Assessment (CCA)
802.11ac Transmitter Specification
- Transmit Spectrum Mask
- Spectral Mask for 20, 40, 80 and 160 MHz Channels
- Frequency Offsets for Spectral Mask Requirement
- 80 + 80 MHz Non-Contiguous Spectrum Mask Values
- Transmit Spectral Flatness
- Transmit Center Frequency and Symbol Clock Tolerance
- Packet Alignment
- Transmitter Modulation Accuracy
- TransmitterCenterFrequency Leakage
- Transmitter Constellation Error
802.11ac Receiver Specification
- Receiver Minimum Input Sensitivity
- Adjacent and Nonadjacent Channel Rejection
- Receiver Maximum Input Level
- Clear Channel Assessment (CCA)
802.11ac Operation Scenarios and Testing
- Operation Scenarios
- Signal Analysis and Testing
- Analyze IEEE 802.11ac signals
- Critical RF parameters such as EVM per carrier, per symbol, and per constellation type
- Burst Detection failed
- Time Sync failed