802.11ac 测试规范
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2014-8-11
Agenda
一、IEEE 802.11ac Key Features 二、IEEE 802.11ac Modulation 三、IEEE 802.11ac TX 測試規範及定義 四、IEEE 802.11ac Rx 測試規範及定義
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•5 GHz RF Band only(幹擾更少)•Wider Channel Bandwidth
–Mandatory 80 MHz channel bandwidth
•Doubles PHY rate at negligible cost increase –Optional 160 MHz channel bandwidth
•Contiguous or 80+80 MHz noncontiguous
•Enhanced Constellation Mapping(速率上升33%)
–Optional 256QAM 3/4 and 5/6 coding rates –Used for both 802.11ac 80 MHz and 160 MHz •Enhanced MiMo Features
–“Multi-User” MiMo capabilities(多使用者的MIMO )
–Based on spatial multiplexing of multiple streams(高達8個空間流，802.11n 最多4個)
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TDFT = DFT/IFDFT Symbol Period ( 符號周期)= 3.2 μs
TSYMS = Short GI symbol interval ( 短 防護符號間隔)= 3.6 μs TSYML = Long GI symbol interval(長 防護符號間隔) = 4.0 μs
NDPSC=Number of data bits per subcarrier(各組子載波的資料 bit 數)
強化調制方式
Bit Per Symbol=log2(Modulation Order)
Ndpsc=Bits Per Symbol *空间流数*Number of Data Subcarriers*Code Rate Data Rate=Ndbps*Symbol Rate*Tdft/Tsym
Spatial Streams (Note1)MCS Index Modulat
ion
type
Coding rate Data Rate(Mb/s)20MHz 40MHz 80MHz 160MHz
Guard Interval Guard IntervalGuard IntervalGuard Interval
800ns 400ns 800ns 400ns 800ns 400ns 800ns 400ns
1
0BPSK 1/2 6.57.213.51529.332.558.5651QPSK 1/21314.4273058.5651171302QPSK 3/419.521.740.54587.897.5175.5195316-QAM 1/22628.95460117130234260416-QAM 3/43943.38190175.5195351390
564-QAM 2/35257.8108120234260468520664-QAM 3/458.565121.5135263.3292.5526.5585764-QAM 5/66572.2135150292.53255856508256-QAM 3/47886.71621803513907027809256-QAM 5/6N/A N/A 180200390433.3780866.72
0BPSK 1/21314.4273058.6651171301QPSK 1/22628.854601171302342602QPSK 3/43943.48190175.6195351390316-QAM 1/25257.8108120234260468520416-QAM 3/47886.6162180351390702780
564-QAM 2/3104115.62162404685209361040664-QAM 3/4117130243270526.658510531170764-QAM 5/6130144.4270300585650117013008256-QAM 3/4156173.4324360702780140415609256-QAM 5/6N/A N/A 360400780866.615601733.43
0BPSK 1/219.521.640.54587.997.5175.51951QPSK 1/23943.28190175.51953513902QPSK 3/458.565.1121.5135263.4292.5526.5585316-QAM 1/27886.7162180351390702780416-QAM 3/4117129.9243270526.558510531170
564-QAM 2/3156173.432436070278014041560664-QAM 3/4175.5195364.5405789.9877.51579.51755764-QAM 5/6195216.6405450877.5975175519508256-QAM 3/4234260.148654010531170210623409256-QAM 5/6N/A N/A 54060011701299.923402600.1
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通道頻寬
空間串流
調變方式子載波間距
編碼率子載波
總數
資料子載波數
Ndpsc
最大資料率
20MHZ 1256-QAM 312.5KHZ 3/4645231286.7Mbps 40MHZ 2256-QAM 312.5KHZ 5/61281081440400Mbps 80MHZ
4
256-QAM 312.5KHZ 5/62562346240 1.7333Gbps 160MHZ 8
256-QAM
312.5KHZ 5/6
512
468
24960
6.933Gbps
子載波間距既符碼率（symbol-rate ）一定的情況下，通道頻寬越高，子載波總數越大
Eg ：80MHZ ，3個空間流，5/6編碼率，短防護間隔的Data Rate ： 8*234*5/6*3*312500*3.2/3.6=1300,000,000bps