802.11ac: A Survival Guide by RachelHead & DavidFutato & RobertRomano & Rebecca Demarest & KarenMontgomery & Mike Loukides & Meghan Blanchette & Matthew Gast

Author:RachelHead & DavidFutato & RobertRomano & Rebecca Demarest & KarenMontgomery & Mike Loukides & Meghan Blanchette & Matthew Gast
Language: eng
Format: epub
Tags: COMPUTERS / Networking / Network Protocols
Publisher: O’Reilly Media
Published: 2013-07-22T16:00:00+00:00

[b] Many combinations of size for the beamforming matrix are available. This table shows the maximum number of angles because it focuses on symmetric systems, but combinations are available for any number of transmitters from 2 through 8, and any number of receivers up to the number of transmitters.

To estimate the size of the feedback matrix, multiply the results of each of the three columns in Table 4-1:

Single-user 2x2 MIMO @ 20 MHz, low resolution: 78-byte report

52 subcarriers x 2 angles/subcarrier x 6 bits/angle = 624 bits or 78 bytes. This is the smallest steering matrix available in 802.11ac.

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