本帖最后由 VKwang 于 2018-3-1 20:46 编辑
Wifi芯片根据产品的不同需求，在功耗，速率，接口，协议有众多选择，选择最合适的定位芯片才是厂商产品的关键，最贵的芯片不一定就是最好的，最便宜的芯片也不一定是符合要求的，本篇**重点介绍速率的挑选依据：
市场主流的wifi产品普遍支持802.11以及802.11ac协议，无线速率在不同参数下是不同的，终端和AP都要满足要求空间流即芯片的重要参数，支持的空间流越大，芯片的理论速率越高，随之的功耗也会越大
802.11n在双天线时，最高可达到300Mbps。红色是市场产品中常听到和接触到的速率。
空间流 | MCS标号 | 调制方式 | 码率 | HT20 数据速率(Mbps) | HT40 数据速率(Mbps) | GI=800ns | GI=400ns | GI=800ns | GI=400ns | 1x1 | 0 | BPSK | 1/2 | 6.5 | 7.2 | 13.5 | 15.0 | 1 | QPSK | 1/2 | 13.0 | 14.2 | 27.0 | 30.0 | 2 | QPSK | 3/4 | 19.5 | 21.7 | 40.5 | 45.0 | 3 | 16-QAM | 1/2 | 26.0 | 28.9 | 54.0 | 60.0 | 4 | 16-QAM | 3/4 | 39.0 | 43.3 | 81.0 | 90.0 | 5 | 64-QAM | 2/3 | 52.0 | 57.8 | 108.0 | 120.0 | 6 | 64-QAM | 3/4 | 58.5 | 65.0 | 121.5 | 135.0 | 7 | 64-QAM | 5/6 | 65.0 | 72.2 | 135.0 | 150.0 | 2x2 | 8 | BPSK | 1/2 | 13.0 | 14.4 | 27.0 | 30 | 9 | QPSK | 1/2 | 26.0 | 28.9 | 54.0 | 60 | 10 | QPSK | 3/4 | 39.0 | 43.3 | 81.0 | 90 | 11 | 16-QAM | 1/2 | 52.0 | 57.8 | 108.0 | 120 | 12 | 16-QAM | 3/4 | 78.0 | 86.7 | 162.0 | 180 | 13 | 64-QAM | 2/3 | 104.0 | 115.6 | 216.0 | 240 | 14 | 64-QAM | 3/4 | 117.0 | 130.0 | 243.0 | 270 | 15 | 64-QAM | 5/6 | 130.0 | 144.4 | 270.0 | 300 | 3x3 | 16 | BPSK | 1/2 | 19.5 | 21.7 | 40.5 | 45 | 17 | QPSK | 1/2 | 39.0 | 43.3 | 81.0 | 90 | 18 | QPSK | 3/4 | 58.5 | 65.0 | 121.5 | 135 | 19 | 16-QAM | 1/2 | 78.0 | 86.7 | 162.0 | 180 | 20 | 16-QAM | 3/4 | 117.0 | 130.0 | 243.0 | 270 | 21 | 64-QAM | 2/3 | 156.0 | 173.3 | 324.0 | 360 | 22 | 64-QAM | 3/4 | 175.5 | 195.0 | 364.5 | 405 | 23 | 64-QAM | 5/6 | 195.0 | 216.7 | 405.0 | 450 | 4x4 | 24 | BPSK | 1/2 | 26.0 | 28.9 | 54.0 | 60 | 25 | QPSK | 1/2 | 52.0 | 57.8 | 108.0 | 120 | 26 | QPSK | 3/4 | 78.0 | 86.7 | 162.0 | 180 | 27 | 16-QAM | 1/2 | 104.0 | 115.6 | 216.0 | 240 | 28 | 16-QAM | 3/4 | 156.0 | 173.3 | 324.0 | 360 | 29 | 64-QAM | 2/3 | 208.0 | 231.1 | 432.0 | 480 | 30 | 64-QAM | 3/4 | 234.0 | 260.0 | 486.0 | 540 | 31 | 64-QAM | 5/6 | 260.0 | 188.9 | 540.0 | 600 |
802.11ac最高可达6.928G，常用6.9G表示。单天线，最高866Mbps。 由于篇幅限制，AC的3*3--8*8由图片形式提供分享
空间流 | MCS | 调制方式 | 码率 | HT20 速率(Mbps) | HT40速率(Mbps) | HT80 速率(Mbps) | VHT160速率(Mbps) | GI=800ns | GI=400ns | GI=800ns | GI=400ns | GI=800ns | GI=400ns | GI=800ns | GI=400ns | 1x1 | 0 | BPSK | 1/2 | 6.5 | 7.2 | 13.5 | 15 | 29.3 | 32.5 | 58.5 | 65 | 1 | QPSK | 1/2 | 13 | 14.4 | 27 | 30 | 58.5 | 65 | 117 | 130 | 2 | QPSK | 3/4 | 19.5 | 21.7 | 40.5 | 45 | 87.8 | 97.5 | 175.5 | 195 | 3 | 16-QAM | 1/2 | 26 | 28.9 | 54 | 60 | 117 | 130 | 234 | 260 | 4 | 16-QAM | 3/4 | 39 | 43.3 | 81 | 90 | 175.5 | 195 | 351 | 390 | 5 | 64-QAM | 2/3 | 52 | 57.8 | 108 | 120 | 234 | 260 | 468 | 520 | 6 | 64-QAM | 3/4 | 58.5 | 65 | 121.5 | 135 | 263.3 | 292.5 | 526.5 | 585 | 7 | 64-QAM | 5/6 | 65 | 72.2 | 135 | 150 | 292.5 | 325 | 585 | 650 | 8 | 256-QAM | 3/4 | 78 | 86.7 | 162 | 180 | 351 | 390 | 702 | 780 | 9 | 256-QAM | 5/6 | N/A | N/A | 180 | 200 | 390 | 433.3 | 780 | 866 | 2x2 | 0 | BPSK | 1/2 | 13 | 14.4 | 27 | 30 | 58.6 | 65 | 117 | 130 | 1 | QPSK | 1/2 | 26 | 28.8 | 54 | 60 | 117 | 130 | 234 | 260 | 2 | QPSK | 3/4 | 39 | 43.4 | 81 | 90 | 175.6 | 195 | 351 | 390 | 3 | 16-QAM | 1/2 | 52 | 57.8 | 108 | 120 | 234 | 260 | 468 | 520 | 4 | 16-QAM | 3/4 | 78 | 86.6 | 162 | 180 | 351 | 390 | 702 | 780 | 5 | 64-QAM | 2/3 | 104 | 115.6 | 216 | 240 | 468 | 520 | 936 | 1040 | 6 | 64-QAM | 3/4 | 117 | 130 | 243 | 270 | 526.6 | 585 | 1053 | 1170 | 7 | 64-QAM | 5/6 | 130 | 144.4 | 270 | 300 | 585 | 650 | 1170 | 1300 | 8 | 256-QAM | 3/4 | 156 | 173.4 | 324 | 360 | 702 | 780 | 1404 | 1560 | 9 | 256-QAM | 5/6 | N/A | N/A | 360 | 400 | 780 | 866.6 | 1560 | 1732 |
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