MIMO简介.ppt

测试数据对比 YT-3用的是MIMO芯片BCM4356 Phiny用的是SISO芯片WCN3680 测试机型 测试项 5米 15米 30米 50米 YT-3 download(Mbit/s) 94.3 78.3 63.8 36.5 Upload(Mbit/s) 85.4 66.3 47.7 27.7 Phinny download(Mbit/s) 52.6 49.3 41.1 18.5 Upload(Mbit/s) 49.9 42.6 34.2 24.3 MIMO 的优点 MIMO 的设计注意事项 两个空间流路径差异越大越好 传输矩阵的condition number尽量小 让两路的数据差异越大越好 天线相关性系数 correlation尽量小 天线的距离尽量远，2.4G半波长的整数倍（6cm，12cm，18cm） 隔离度15dB 天线位置垂直摆放，极化方向不同 两个天线使用不同的类型 MIMO 的设计注意事项 Power imbalance的影响 天线效率以及传导一致性的偏差，两路发射功率会有差异 总体上吞吐优于单天线 强信号下没有影响 中等弱信号下会降速 远端 MRC 还是 有点作用 MIMO 的设计注意事项 BOM成本增加 BCM43455 2.5$ vs BCM4356 3.5$，成本增加1$ 外围器件成本增加0.25$ 天线+cable成本增加0.5$ 产线测试成本增加，认证成本增加 系统复杂度增加，故障率上升 高速信号线PCIE 风险 * MIMO 的设计注意事项 * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. * ??? 2011 Lenovo Confidential. All rights reserved. MIMO 简介 1. 什么是MIMO 2.MIMO的优点 3.MIMO 的设计注意事项 什么是MIMO MIMO：Multiple-Input Multiple-Output 多入多出 技术 发