IEEE 802.11ac

IEEE 802.11ac or Wi-Fi 5 is a standard for wireless computer networks from the 802.11 family, known under the more common name WLAN , also known as Wi-Fi in English-speaking regions . The development was promoted by the IEEE primarily with regard to high data rates in the 5 GHz band. The actual standard was adapted several times from 2011 to 2013 and finally passed. The final report and the official standardization were published on December 18, 2013.

The standard provides for a single channel throughput of up to 867 megabits per second. This is achieved primarily through further development of the techniques used in the IEEE 802.11n standard: larger channel bandwidths of up to 160 MHz and improved signal modulation; in addition, up to eight multiple connections (8 × 8 MIMO ) are provided. In purely mathematical terms, this would result in a maximum throughput of 6933 megabits per second. In trade (as of the end of 2015), however, practically only devices with 4 × 4 multi-user MIMO, 80 MHz bandwidth and 1733 Mbit / s can be found.

Changes from 802.11n

wider channels possible (80 MHz, 160 MHz channel width optional)
multiple MIMO connections (up to eight)
Downstream multi-user MIMO (must be supported by the access point and client, typically 2 to 3 MU-MIMO clients simultaneously)
Higher modulation levels with a very good received signal (256-QAM with 3/4 and 5/6 FEC)
Standardized beamforming

Theoretical throughput (in Mbit / s)
MCS index	Spatial Streams	Modulation type	Coding rate	20 MHz channels		40 MHz channels		80 MHz channels		160 MHz channels
MCS index	Spatial Streams	Modulation type	Coding rate	800 ns GI	400 ns Eq	800 ns GI	400 ns Eq	800 ns GI	400 ns Eq	800 ns GI	400 ns Eq
0	1	BPSK	1/2	6.5	7.2	13.5	15th	29.3	32.5	58.5	65
1	1	QPSK	1/2	13	14.4	27	30th	58.5	65	117	130
2	1	QPSK	3/4	19.5	21.7	40.5	45	87.8	97.5	175.5	195
3	1	16- QAM	1/2	26th	28.9	54	60	117	130	234	260
4th	1	16-QAM	3/4	39	43.3	81	90	175.5	195	351	390
5	1	64-QAM	2/3	52	57.8	108	120	234	260	468	520
6th	1	64-QAM	3/4	58.5	65	121.5	135	263.3	292.5	526.5	585
7th	1	64-QAM	5/6	65	72.2	135	150	292.5	325	585	650
8th	1	256-QAM	3/4	78	86.7	162	180	351	390	702	780
9	1	256-QAM	5/6	N / A	N / A	180	200	390	433.3	780	866.7
0	2	BPSK	1/2	13	14.4	27	30th	58.5	65	117	130
1	2	QPSK	1/2	26th	28.9	54	60	117	130	234	260
2	2	QPSK	3/4	39	43.3	81	90	175.5	195	351	390
3	2	16-QAM	1/2	52	57.8	108	120	234	260	468	520
4th	2	16-QAM	3/4	78	86.7	162	180	351	390	702	780
5	2	64-QAM	2/3	104	115.6	216	240	468	520	936	1040
6th	2	64-QAM	3/4	117	130.3	243	270	526.5	585	1053	1170
7th	2	64-QAM	5/6	130	144.4	270	300	585	650	1170	1300
8th	2	256-QAM	3/4	156	173.3	324	360	702	780	1404	1560
9	2	256-QAM	5/6	N / A	N / A	360	400	780	866.7	1560	1733.4
0	3	BPSK	1/2	19.5	21.7	40.5	45	87.8	97.5	175.5	195
1	3	QPSK	1/2	39	43.3	81	90	175.5	195	351	390
2	3	QPSK	3/4	58.5	65	121.5	135	263.3	292.5	526.5	585
3	3	16-QAM	1/2	78	86.7	162	180	351	390	702	780
4th	3	16-QAM	3/4	117	130	243	270	526.5	585	1053	1170
5	3	64-QAM	2/3	156	173.3	324	360	702	780	1404	1560
6th	3	64-QAM	3/4	175.5	195	364.5	405	N / A	N / A	1579.5	1755
7th	3	64-QAM	5/6	195	216.7	405	450	877.5	975	1755	1950
8th	3	256-QAM	3/4	234	260	486	540	1053	1170	2106	2340
9	3	256-QAM	5/6	260	288.9	540	600	1170	1300	2340	2600
0	4th	BPSK	1/2	26th	28.8	54	60	117.2	130	234	260
1	4th	QPSK	1/2	52	57.6	108	120	234	260	468	520
2	4th	QPSK	3/4	78	86.8	162	180	351.2	390	702	780
3	4th	16-QAM	1/2	104	115.6	216	240	468	520	936	1040
4th	4th	16-QAM	3/4	156	173.2	324	360	702	780	1404	1560
5	4th	64-QAM	2/3	208	231.2	432	480	936	1040	1872	2080
6th	4th	64-QAM	3/4	234	260	486	540	1053.2	1170	2106	2340
7th	4th	64-QAM	5/6	260	288.8	540	600	1170	1300	2340	2600
8th	4th	256-QAM	3/4	312	346.8	648	720	1404	1560	2808	3120
9	4th	256-QAM	5/6	N / A	N / A	720	800	1560	1733.2	3120	3466.8

Individual evidence

↑ Official IEEE 802.11 Working Group Project Timelines. November 3, 2012, accessed December 6, 2013 .
↑ IEEE SA - 802.11ac-2013 - IEEE Standard for Information technology. Retrieved April 2, 2014 .
↑ Michael Kassner: Cheat sheet: What you need to know about 802.11ac. In: TechRepublic . June 18, 2013, accessed December 6, 2013 .
↑ IEEE Std 802.11ac ™ -2013 - 22.5 Parameters for VHT-MCSs . IEEE. Pp. 323-339. December 11, 2013. Retrieved April 13, 2015.

[1] Official IEEE 802.11 Working Group Project Timelines. November 3, 2012, accessed December 6, 2013 .

[802.11ac-2013-2] IEEE SA - 802.11ac-2013 - IEEE Standard for Information technology. Retrieved April 2, 2014 .

[kassner2013-3] Michael Kassner: Cheat sheet: What you need to know about 802.11ac. In: TechRepublic . June 18, 2013, accessed December 6, 2013 .

[802.11ac-2013-chapter-22.5-4] IEEE Std 802.11ac ™ -2013 - 22.5 Parameters for VHT-MCSs . IEEE. Pp. 323-339. December 11, 2013. Retrieved April 13, 2015.