Tech Talks LIVE Schedule Presentation will begin shortly
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Tech Talks LIVE Schedule – Presentation will begin shortly 3月31日，星期三 聚焦Silicon Labs的到达角(AoA)解决方案 Zoom in on Silicon Labs Angle of Arrival (AoA) Solution 4月30日，星期五 探索超低功耗 Wi-Fi 解决方案 RS9116W Discover the Ultra-low-power Wi-Fi Solution RS9116W 5月18日，星期二 使用蓝牙 Xpress 模块加速蓝牙开发 Speed up Bluetooth Development with Bluetooth Xpress Modules Recording and slides will be posted to: www.silabs.com/training 4:00 3:59 3:58 3:57 3:56 3:55 3:54 3:53 3:52 3:51 3:50 3:49 3:48 3:47 3:46 3:45 3:44 3:43 3:42 3:41 3:40 3:39 3:38 3:37 3:36 3:35 3:34 3:33 3:32 3:31 3:30 3:29 3:28 3:27 3:26 3:25 3:24 3:23 3:22 3:21 3:20 3:19 3:18 3:17 3:16 3:15 3:14 3:13 3:12 3:11 3:10 3:09 3:08 3:07 3:06 3:05 3:04 3:03 3:02 3:01 3:00 2:59 2:58 2:57 2:56 2:55 2:54 2:53 2:52 2:51 2:50 2:49 2:48 2:47 2:46 2:45 2:44 2:43 2:42 2:41 2:40 2:39 2:38 2:37 2:36 2:35 2:34 2:33 2:32 2:31 2:30 2:29 2:28 2:27 2:26 2:25 2:24 2:23 2:22 2:21 2:20 2:19 2:18 2:17 2:16 2:15 2:14 2:13 2:12 2:11 2:10 2:09 2:08 2:07 2:06 2:05 2:04 2:03 2:02 2:01 2:00 4:00 We will begin in: 1:59 1:58 1:57 1:56 1:55 1:54 1:53 1:52 1:51 1:50 1:49 1:48 1:47 1:46 1:45 1:44 1:43 1:42 1:41 1:40 1:39 1:38 1:37 1:36 1:35 1:34 1:33 1:32 1:31 1:30 1:29 1:28 1:27 1:26 1:25 1:24 1:23 1:22 1:21 1:20 1:19 1:18 1:17 1:16 1:15 1:14 1:13 1:12 1:11 1:10 1:09 1:08 1:07 1:06 1:05 1:04 1:03 1:02 1:01 1:00 0:59 0:58 0:57 0:56 0:55 0:54 0:53 0:52 0:51 0:50 0:49 0:48 0:47 0:46 0:45 0:44 0:43 0:42 0:41 0:40 0:39 0:38 0:37 0:36 0:35 0:34 0:33 0:32 0:31 0:30 0:29 0:28 0:27 0:26 0:25 0:24 0:23 0:22 0:21 0:20 0:19 0:18 0:17 0:16 0:15 0:14 0:13 0:12 0:11 0:10 0:09 0:08 0:07 0:06 0:05 0:04 0:03 0:02 0:01 3:00 Wireless Connectivity Tech Talks
Transcript of Tech Talks LIVE Schedule Presentation will begin shortly
Tech Talks LIVE Schedule – Presentation will begin shortly
3月31日，星期三聚焦Silicon Labs的到达角(AoA)解决方案Zoom in on Silicon Labs Angle of Arrival (AoA) Solution
4月30日，星期五探索超低功耗 Wi-Fi 解决方案 RS9116WDiscover the Ultra-low-power Wi-Fi Solution RS9116W
5月18日，星期二使用蓝牙 Xpress 模块加速蓝牙开发Speed up Bluetooth Development with Bluetooth Xpress Modules
Recording and slides will be posted to:www.silabs.com/training
4:003:593:583:573:563:553:543:533:523:513:503:493:483:473:463:453:443:433:423:413:403:393:383:373:363:353:343:333:323:313:303:293:283:273:263:253:243:233:223:213:203:193:183:173:163:153:143:133:123:113:103:093:083:073:063:053:043:033:023:013:002:592:582:572:562:552:542:532:522:512:502:492:482:472:462:452:442:432:422:412:402:392:382:372:362:352:342:332:322:312:302:292:282:272:262:252:242:232:222:212:202:192:182:172:162:152:142:132:122:112:102:092:082:072:062:052:042:032:022:012:004:00We will begin in: 1:591:581:571:561:551:541:531:521:511:501:491:481:471:461:451:441:431:421:411:401:391:381:371:361:351:341:331:321:311:301:291:281:271:261:251:241:231:221:211:201:191:181:171:161:151:141:131:121:111:101:091:081:071:061:051:041:031:021:011:000:590:580:570:560:550:540:530:520:510:500:490:480:470:460:450:440:430:420:410:400:390:380:370:360:350:340:330:320:310:300:290:280:270:260:250:240:230:220:210:200:190:180:170:160:150:140:130:120:110:100:090:080:070:060:050:040:030:020:013:00
Wireless Connectivity Tech Talks
Silicon Labs Confidential
WELCOME聚焦Silicon Labs的到达角(AoA)解决方案Zoom in on Silicon Labs AoA solution
梅汉忠 (Chung Mui) , 中国华南区高级应用工程师
Agenda
▪ Direction Finding: Angel-of-Arrival (AoA)
▪ Silicon Labs Enhanced AoA mode
▪Overview of Silicon Labs AoA Solutions
▪ Hardware▪ Bluetooth SoC – BG22▪ Antenna Array Reference Design
▪ Software▪ Bluetooth SDK▪ Real Time Location (RTL) Library
▪ Example apps and development kits
▪ Documentation
▪Q&A
Silicon Labs Confidential3
How Angle-of-Arrival (AoA) Works?
▪ An asset wants to broadcast its location
▪ Continuous tone extension (CTE) is added to the end of a Bluetooth advertisement or connection packet
▪ Asset can support other Bluetooth functions while being tracked as CTE does not use the payload
A locator wants to find the asset
▪ A locator needs to have multiple antennas, as antenna is switched during the CTE reception
▪ A locator listens for CTE packets and measures IQ data from the CTE payload
▪ Can perform spherical azimuth and elevation calculation, or pass the IQ data forward to back-end processing
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Transmitter (TX)e.g. Tag
Receiver (RX)e.g. Locator
𝜃
Silicon Labs Confidential
Constant Tone Extension (CTE) -- single tone sine wave
How AoA Works at a System Level?
Silicon Labs Confidential5
𝜃1𝜃2
𝜑1 𝜑2
h h
Asset(x,y,z)
Bluetooth AoA Locators▪ While one locator can be used to
estimate the assets location, a network of multiple locators improve accuracy and reliability
▪ Locators with enough processing power can pre-process to IQ data
Bluetooth AoA Asset▪ Transmits CTE packets
Local Position Engine▪ Collects relative raw or pre-processed IQ data
from all locators
▪ Performs X,Yand Z calculations
▪ Additional applications(site planning zones, alerts, heat maps etc.)
Cloud Position Engine▪ Collects relative raw or pre-processed IQ data
from all locators
▪ Performs X,Yand Z calculations
▪ Additional applications(site planning zones, alerts, heat maps etc.)
Cloud Position Engine
Locator 1 Locator 2
Local Position Engine
Boosting AoA Scalability by Silicon Labs Enhanced mode
▪ Bluetooth 5.1 Direction Finding
▪ Two modes to Tx/Rx CTE
▪ Connection mode (based on connection)
▪ Connectionless mode (based on periodic advertising)
▪ Both require RAM allocation on the locator to maintain the connections or synchronizations
▪ Limit the number of supported tags (typically <50)
▪ Also establishing connections or periodic advertizing syncs can be time consuming for large number of assets
▪ Silicon Labs Enhanced mode
▪ Silicon Labs proprietary
▪ CTE transmission in the BT 5.0 extended ADV packets
▪ Little RAM is needed in the locator and no time syncing is needed
▪ CTE still tranmitted on 37 data channels maximizing spectrum usage
▪ Tag implementation is very simple and low power
▪ Up to 1000 tags
Silicon Labs Confidential6
tag locator
BT 5.1: Connection mode
Connection establishment
CTE_REQ
CTE_RSP
tag locator
BT 5.1: Connectionless mode(periodic advertising)
Synchronization
AUX_SYNC_IND
AUX_SYNC_IND
tag locator
Silicon Labs enhanced mode(extended advertising)
AUX_ADV_IND
AUX_ADV_IND
AUX_ADV_IND
AUX_ADV_IND
TA G S L O C AT O R S P O S I T I O N I N G E N G I N E
Silicon Labs’ Solutions for Implementing AoA
Hardware • Bluetooth SoC: BG22
Software• Bluetooth SDK v3.1 or above• Demo and example code
Development kit
• Thunderboard BG22
Hardware • Not supplied by Silicon Labs (e.g.
PC, Cortex-A, etc)
Software• Real Time Location (RTL) Library
(on Windows and Linux)• Demo and example code
Development kit Not supplied by Silicon Labs
Hardware• Bluetooth SoC: BG22• 4x4 antenna array ref. design
Software• Bluetooth SDK v3.1 or above• Demo and example code
Development kit
• 4x4 antenna Array Radio Board• SWTK mainboard
Hardware – BG22: Optimized Battery Powered Bluetooth LE SoC
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Secure Bluetooth 5.2 SoCs for High-Volume Products
RadioTx: -27 to +6 dBm
Rx:
-106.7 dBm @ 125 kbps GFSK
-98.9 dBm @ 1 Mbit/s GFSK
-96.2 dBm @ 2 Mbit/s GFSK
Ultra-Low Power3.4 mA @ 0dBm Tx (radio only)
2.5 mA RX (radio only)
4.1 mA @ 0dBm Tx (radio + MCU)
3.6 mA RX current (radio + MCU)
1.4 µA EM2 with 32 kB RAM
0.5 µA w/ RTC in EM4
25 µA/MHz in active mode (EM0)
Compact Size5x5x0.85mm QFN40 (26 GPIO)
4x4x0.85mm QFN32 (18 GPIO)
4x4x0.3mm TQFN32 (18 GPIO)
ARM Cortex-M33 with TrustZone38.4/76.8 MHz352/512 kB of flash
32kB RAM
Peripherals Fit for Purpose
2x USART, 2x I2C, 2x PDM and GPIO
ADC (16 channels)
Built-in temperature sensor with +/- 1.5 oC
Built-in 32 kHz, 500ppm sleep clock
SecurityAES128/256,SHA-1, SHA-2 (256-bit)
ECC (up to 256-bit), ECDSA and ECDH
True Random Number Generator (TRNG)
Secure boot with RTSL
Secure debug with lock/unlock
ApplicationsConsumers
Smart Home
Portable healthcare devices
Asset tracking tags
BT mesh low-power nodes
Protocol Support
Bluetooth 5.21M, 2M and LE Coded PHYsDirection Finding (AoA & AoD)BT mesh Low Power Node(512 kB parts only)Proprietary
Wide Operation Range 1.71 V to 3.8 V-40 °C to 125 °C
Detailed info
Hardware – 4x4 Antenna Array Reference Design
Silicon Labs Confidential9
▪ Components
▪ 16 (4x4) patch antennas (4 GPIOs)
▪ 1 BG22 SoC
▪ 5 (1+4) SP4T RF antenna switches
▪ 16 matching circuits
▪ Firmware features
▪ Automatically switch by stack
▪ Up to 64 antennas with 6 GPIOs
▪ Configurable switching sequence
Documentations
▪ Schematic, PCB, BoM, …etc
▪ Design Guidelines
▪ Measurement results
▪ Refer to AN1195 (link)
▪ Development board
▪ Order code: SLWBRD4185A
Software – Bluetooth SDK (1/2)
▪ Bluetooth SDK v3.1
▪ Bluetooth 5.2 stack
▪ Supports AoA
▪ AoA Tag
▪ SoC mode (no external host MCU)
▪ Connection, Connectionless, Silicon Labs Enhanced mode
▪ Example projects
▪ Proprietary Asseting Tracking Profile (ATP)
▪ CTE (GATT) Services (e.g. change of CTE parameters)
Silicon Labs Confidential10
Software – Bluetooth SDK (2/2)
▪ AoA Locators▪ BG22 and external host MCU
▪ BG22
▪ NCP mode (so-called slave mode)
▪ Bluetooth stack
▪ Antenna array switching
▪ Output IQ sample data
▪ Example
▪ NCP AoA locator (locator target app)
▪ External host MCU
▪ Application
▪ Control BG22
▪ IQ samples → angles
▪ Angles → x,y,z
▪ Example
▪ locator host example app
Silicon Labs Confidential
Cortex-A or x64
Software – Real Time Location (RTL) Library
▪ Overview of RTL library
▪ Direction Finding (IQ samples → angles)
▪ Location Finding (angles → x,y,z)
▪ Utility Functions
▪ RTL library converts I/Q data to position
▪ Takes I/Q data as input from BG22
▪ Detects and filters out multipath
▪ Detects and filters out collisions (I/Q quality)
▪ Output azimuth & elevation or X, Y and Z
▪ Angle and elevation filtering algorithms for different use cases (high accuracy, real time etc.)
▪ Features
▪ Supported platforms:
▪ Windows , Ubuntu, Raspberry Pi (Cortex A), Darwin
▪ Number of locators: 100
▪ Silicon Labs’ 4x4 antenna array ref. design
▪ IQ Sample Quality Analysis tool
▪ Example code
Example apps and development kits
Silicon Labs Confidential
Documentation
▪ UG103.18: Bluetooth® Direction Finding Fundamentals (link)
▪ QSG175: Silicon Labs Direction Finding Solution Quick-Start Guide (link)▪ Architecture, Supported features, RTL library, Demos, and
Examples
▪ AN1296: Application Development with Silicon Labs’ RTL Library (link)
▪ AN1297: Custom Direction-Finding Solutions using Silicon Labs’ Bluetooth Stack. (link)
▪ Additional development information▪ Bluetooth SDK v3.1 API (link)
▪ RTL API (link)
▪ AN1195: Antenna Array Design Guidelines for Direction Finding (link)
▪ Online training (link)▪ AoA Direction Finding in Bluetooth SDK
▪ AoA Direction Finding Lab
Silicon Labs Confidential
Q&A微信公众号 官方微博 中文社区
Silicon Labs Confidential
THANK YOU
Recording and slides will be posted to:www.silabs.com/training
