Computer Science > STUDY GUIDE > Salt Lake Community CollegeCSIS 2310Chapter 18 (All)

Salt Lake Community CollegeCSIS 2310Chapter 18

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Chapter 18 High Throughput (HT) and 802.11n In this chapter, you will learn about the following: 802.11n-2009 amendment Wi-Fi Alliance certification MIMO Radio chains Spatial multiplexing (SM) ... MIMO diversity Space-Time Block Coding (STBC) Cyclic Shift Diversity (CSD) Transmit beamforming (TxBF) HT channels 20 MHz non-HT and HT channels 40 MHz channels 40 MHz Intolerant Guard interval (GI) Modulation and coding scheme (MCS) HT PHY Non-HT legacy HT Mixed HT Greenfield HT MAC A-MSDU A-MPDU Block Acknowledgement RIFS HT power management HT operation 20/40 channel operation HT protection modes (0–3) RTS/CTS and CTS-to-self 802.11n migration and deployment In this chapter, we discuss the most talked about Wi-Fi technology that is defined under the 802.11n-2009 amendment. The original main objective of the 802.11n amendment is to increase the data rates and the throughput in both the 2.4 GHz and 5 GHz frequency bands. The 802.11n amendment defines a new operation known as High Throughput (HT), which provides PHY and MAC enhancements to provide for data rates potentially as high as 600 Mbps. 802.11n requires a whole new approach to the Physical layer, using a technology called multiple-input multiple-output (MIMO) that requires the use of multiple radios and antennas. As you learned in earlier chapters, multipath is an RF behavior that can cause performance degradation in legacy 802.11a/b/g WLANs. 802.11n radios use MIMO technology, which takes advantage of multipath to increase throughput as well as range. [Show More]

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