Ultra-wideband

Summary

Ultra-wideband (UWB, ultra wideband, ultra-wide band and ultraband) is a radio technology that can use a very low energy level for short-range, high-bandwidth communications over a large portion of the radio spectrum.[1] UWB has traditional applications in non-cooperative radar imaging. Most recent applications target sensor data collection, precise locating,[2] and tracking.[3][4][5] UWB support started to appear in high-end smartphones c. 2019.

CharacteristicsEdit

Ultra-wideband is a technology for transmitting information across a wide bandwidth (>500 MHz). This allows for the transmission of a large amount of signal energy without interfering with conventional narrowband and carrier wave transmission in the same frequency band. Regulatory limits in many countries allow for this efficient use of radio bandwidth, and enable high-data-rate personal area network (PAN) wireless connectivity, longer-range low-data-rate applications, and radar and imaging systems, coexisting transparently with existing communications systems.

Ultra-wideband was formerly known as pulse radio, but the FCC and the International Telecommunication Union Radiocommunication Sector (ITU-R) currently define UWB as an antenna transmission for which emitted signal bandwidth exceeds the lesser of 500 MHz or 20% of the arithmetic center frequency.[6] Thus, pulse-based systems—where each transmitted pulse occupies the UWB bandwidth (or an aggregate of at least 500 MHz of narrow-band carrier; for example, orthogonal frequency-division multiplexing (OFDM))—can access the UWB spectrum under the rules.

TheoryEdit

A significant difference between conventional radio transmissions and UWB is that conventional systems transmit information by varying the power level, frequency, and/or phase of a sinusoidal wave. UWB transmissions transmit information by generating radio energy at specific time intervals and occupying a large bandwidth, thus enabling pulse-position or time modulation. The information can also be modulated on UWB signals (pulses) by encoding the polarity of the pulse, its amplitude and/or by using orthogonal pulses. UWB pulses can be sent sporadically at relatively low pulse rates to support time or position modulation, but can also be sent at rates up to the inverse of the UWB pulse bandwidth. Pulse-UWB systems have been demonstrated at channel pulse rates in excess of 1.3 billion pulses per second using a continuous stream of UWB pulses (Continuous Pulse UWB or C-UWB), while supporting forward error-correction encoded data rates in excess of 675 Mbit/s.[7]

A UWB radio system can be used to determine the "time of flight" of the transmission at various frequencies. This helps overcome multipath propagation, since some of the frequencies have a line-of-sight trajectory, while other indirect paths have longer delays. With a cooperative symmetric two-way metering technique, distances can be measured to high resolution and accuracy.[8]

ApplicationsEdit

Real-time locationEdit

UWB is useful for real-time location systems, and its precision capabilities and low power make it well-suited for radio-frequency-sensitive environments, such as hospitals. UWB is also useful for peer-to-peer fine ranging, which allows many applications based on relative distance between two entities.

Indoor locatingEdit

The omlox technology standard enables the provision of location data independent of technology and manufacturer. The UWB part is based on the IEEE 802.15.4.z[9] standard.

Mobile telephonyEdit

Apple launched the first three phones with ultra-wideband capabilities in September 2019, namely, the iPhone 11, iPhone 11 Pro, and iPhone 11 Pro Max.[10][11][12] Apple also launched Series 6 of Apple Watch in September 2020, which features UWB,[13] and their AirTags featuring this technology was revealed at a press event on April 20, 2021.[14][5] The Samsung Galaxy Note 20 Ultra and Galaxy S21 Ultra and S21+ also support UWB,[15] along with the Samsung Galaxy SmartTag+.[16] The Xiaomi MIX 4 released in August 2021 supports UWB, and capabilities of connecting to select AIoT devices.[17]

The FiRa Consortium was founded in August 2019 to develop interoperable UWB ecosystems including mobile phones. Samsung, Xiaomi, Oppo are currently members of the FiRa Consortium.[18] In November 2020, Android Open Source Project received first patches related to an upcoming UWB API; feature-complete UWB support is expected in later versions of Android.[19]

Digital keysEdit

A UWB Digital Car Key operates based on the distance between a car and a smartphone.[20]

ProductsEdit

A small number of UWB integrated circuits focused on location systems are in production or planned for production as of 2020.

Supplier Product Name Standard Band Announced Commercial Products
Microchip ATA8350 LRP 6.2-7.8GHz Feb 2021
Microchip ATA8352 LRP 6.2-8.3GHz Feb 2021
NXP NCJ29D5 HRP 6–8.5 GHz[21] Nov 12, 2019
NXP SR100T HRP 6–9 GHz[22] Sept 17, 2019 Samsung Galaxy Note20 Ultra[23]
Apple Inc. U1 HRP[24] 6–8.5 GHz[25] Sept 11, 2019 iPhone 11 series, Apple Watch Series 6, iPhone 12 series, HomePod Mini, AirTag, iPhone 13 series
Qorvo DW1000 HRP 3.5–6.5 GHz[26] Nov 7, 2013
Qorvo DW3000 HRP 6–8.5 GHz[27] Jan 2019[28]
3 dB 3DB6830 LRP 6–8 GHz[29]
CEVA RivieraWaves UWB HRP 3.1–10.6 GHz depending on radio Jun 24, 2021[30]

Industrial applicationsEdit

UWB has been evaluated for use in signaling of the New York City Subway.[citation needed]

RadarEdit

Ultra-wideband gained widespread attention for its implementation in synthetic aperture radar (SAR) technology. Due to its high resolution despite using lower frequencies, UWB SAR was heavily researched for its object-penetration ability.[31][32][33] Starting in the early 1990s, the U.S. Army Research Laboratory (ARL) developed various stationary and mobile ground-, foliage-, and wall-penetrating radar platforms that served to detect and identify buried IEDs and hidden adversaries at a safe distance. Examples include the railSAR, the boomSAR, the SIRE radar, and the SAFIRE radar.[34][35] ARL has also investigated the feasibility of whether UWB radar technology can incorporate Doppler processing to estimate the velocity of a moving target when the platform is stationary.[36] While a 2013 report highlighted the issue with the use of UWB waveforms due to target range migration during the integration interval, more recent studies have suggested that UWB waveforms can demonstrate better performance compared to conventional Doppler processing as long as a correct matched filter is used.[37]

Ultra-wideband pulse Doppler radars have also been used to monitor vital signs of the human body, such as heart rate and respiration signals as well as human gait analysis and fall detection. It serves as a potential alternative to continuous-wave radar systems since it involves less power consumption and a high-resolution range profile. However, its low signal-to-noise ratio has made it vulnerable to errors.[38][39] A commercial example of this application is RayBaby, which is a baby monitor that detects breathing and heart rate to determine whether a baby is asleep or awake. Raybaby has a detection range of five meters and can detect fine movements of less than a millimeter.[40]

Ultra-wideband is also used in "see-through-the-wall" precision radar-imaging technology,[41][42][43] precision locating and tracking (using distance measurements between radios), and precision time-of-arrival-based localization approaches.[44] It is efficient, with a spatial capacity of approximately 1013 bit/s/m2.[citation needed] UWB radar has been proposed as the active sensor component in an Automatic Target Recognition application, designed to detect humans or objects that have fallen onto subway tracks.[45]

Data transferEdit

Ultra-wideband characteristics are well-suited to short-range applications, such as PC peripherals, wireless monitors, camcorders, wireless printing, and file transfers to portable media players.[46] UWB was proposed for use in personal area networks, and appeared in the IEEE 802.15.3a draft PAN standard. However, after several years of deadlock, the IEEE 802.15.3a task group[47] was dissolved[48] in 2006. The work was completed by the WiMedia Alliance and the USB Implementer Forum. Slow progress in UWB standards development, the cost of initial implementation, and performance significantly lower than initially expected are several reasons for the limited use of UWB in consumer products (which caused several UWB vendors to cease operations in 2008 and 2009).[49]

RegulationEdit

In the US, ultra-wideband refers to radio technology with a bandwidth exceeding the lesser of 500 MHz or 20% of the arithmetic center frequency, according to the U.S. Federal Communications Commission (FCC). A February 14, 2002 FCC Report and Order[50] authorized the unlicensed use of UWB in the frequency range from 3.1 to 10.6 GHz. The FCC power spectral density emission limit for UWB transmitters is −41.3 dBm/MHz. This limit also applies to unintentional emitters in the UWB band (the "Part 15" limit). However, the emission limit for UWB emitters may be significantly lower (as low as −75 dBm/MHz) in other segments of the spectrum.

Deliberations in the International Telecommunication Union Radiocommunication Sector (ITU-R) resulted in a Report and Recommendation on UWB[citation needed] in November 2005. UK regulator Ofcom announced a similar decision[51] on 9 August 2007.

There has been concern over interference between narrowband and UWB signals that share the same spectrum. Earlier, the only radio technology that used pulses was spark-gap transmitters, which international treaties banned because they interfere with medium-wave receivers. However, UWB uses much lower levels of power. The subject was extensively covered in the proceedings that led to the adoption of the FCC rules in the US, and in the meetings of the ITU-R leading to its Report and Recommendations on UWB technology. Commonly-used electrical appliances emit impulsive noise (for example, hair dryers), and proponents successfully argued that the noise floor would not be raised excessively by wider deployment of low power wideband transmitters.[citation needed]

Coexistence with other standardsEdit

In February 2002, the Federal Communication Commission (FCC) released an amendment (Part 15) that specifies the rules of UWB transmission and reception. According to this release, any signal with fractional bandwidth greater than 20% or having a bandwidth greater than 500 MHz is considered as an UWB signal. The FCC ruling also defines access to 7.5 GHz of unlicensed spectrum between 3.1 and 10.6 GHz that is made available for communication and measurement systems.[citation needed]

Narrowband signals that exist in the UWB range, such as IEEE 802.11a transmissions, may exhibit a high power spectral density (PSD) levels compared to the PSD of UWB signals as seen by a UWB receiver. As a result, one would expect a degradation of the UWB bit error rate performance.[52] Notched UWB antennas [53] and filters[54] are designed for coexistence of UWB devices with the narrowband devices.

Technology groupsEdit

See alsoEdit

ReferencesEdit

  1. ^ USC Viterbi School of Engineering. Archived from the original 2012-03-21.
  2. ^ Zhou, Yuan; Law, Choi Look; Xia, Jingjing (2012). "Ultra low-power UWB-RFID system for precise location-aware applications". 2012 IEEE Wireless Communications and Networking Conference Workshops (WCNCW). pp. 154–158. doi:10.1109/WCNCW.2012.6215480. ISBN 978-1-4673-0682-9. S2CID 18566847.
  3. ^ Ultra Wide Band (UWB) Development. Archived from the original 2012-03-21.
  4. ^ Kshetrimayum, R. (2009). "An introduction to UWB communication systems". IEEE Potentials. 28 (2): 9–13. doi:10.1109/MPOT.2009.931847. S2CID 41494371.
  5. ^ a b "How Do Apple AirTags Work? Ultra-Wideband Explained". PCMAG. Retrieved 2022-08-07.
  6. ^ Characteristics of ultra-wideband technology
  7. ^ "Wireless HD video: Raising the UWB throughput bar (again)". EETimes. Retrieved 17 April 2018.
  8. ^ Efficient method of TOA estimation for through wall imaging by UWB radar. International Conference on Ultra-Wideband, 2008.
  9. ^ "IEEE 802.15.4z-2020 - IEEE Standard for Low-Rate Wireless Networks--Amendment 1: Enhanced Ultra Wideband (UWB) Physical Layers (PHYs) and Associated Ranging Techniques". ieee.org. IEEE Standard. Retrieved 2021-12-07.
  10. ^ Snell, Jason (13 September 2019). "The U1 chip in the iPhone 11 is the beginning of an Ultra Wideband revolution". Six Colors. Retrieved 2020-04-22.
  11. ^ Pocket-lint (2019-09-11). "Apple U1 chip explained: What is it and what can it do?". Pocket-lint. Retrieved 2020-04-22.
  12. ^ "The Biggest iPhone News Is a Tiny New Chip Inside It". Wired. ISSN 1059-1028. Retrieved 2020-04-22.
  13. ^ Rossignol, Joe (September 15, 2020). "Apple Watch Series 6 Features U1 Chip for Ultra Wideband". MacRumors. Retrieved 2020-10-08.
  14. ^ "Apple AirTag arrives for $29, uses Ultra Wideband and does Emoji". GSMArena.com. Retrieved 2021-04-21.
  15. ^ ID, FCC. "SMN985F GSM/WCDMA/LTE Phone + BT/BLE, DTS/UNII a/b/g/n/ac/ax, UWB, WPT and NFC Test Report LBE20200637_SM-N985F-DS_EMC+Test+Report_FCC_Cer_Issue+1 Samsung Electronics". FCC ID. Retrieved 2020-07-30.
  16. ^ Bohn, Dieter (2021-01-14). "Samsung's Galaxy SmartTag is a $29.99 Tile competitor". The Verge. Retrieved 2021-02-16.
  17. ^ "NXP Trimension™ Ultra-Wideband Technology Powers Xiaomi MIX4 Smartphone to Deliver New "Point to Connect" Smart Home Solution". GlobelNewswire. 2021-09-26.
  18. ^ "FiRa Consortium".
  19. ^ "Google is adding an Ultra-wideband (UWB) API in Android". xda-developers. 2020-11-10. Retrieved 2020-11-11.
  20. ^ "What's the deal with ultra wide band". BMW. BMW. Retrieved 29 June 2021.
  21. ^ "NCJ29D5 | Ultra-Wideband for Automotive IC | NXP". www.nxp.com. Retrieved 2020-07-28.
  22. ^ "NXP unveils NFC, UWB and secure element chipset • NFCW". NFCW. 2019-09-19. Retrieved 2020-07-28.
  23. ^ "NXP Secure UWB deployed in Samsung Galaxy Note20 Ultra Bringing the First UWB-Enabled Android Device to Market | NXP Semiconductors - Newsroom". media.nxp.com. Retrieved 2020-09-24.
  24. ^ Dahad, Nitin (2020-02-20). "IoT devices to gain UWB connectivity". Embedded.com. Retrieved 2020-07-28.
  25. ^ Zafar, Ramish (2019-11-03). "iPhone 11 Has UWB With U1 Chip - Preparing Big Features For Ecosystem". Wccftech. Retrieved 2020-07-28.
  26. ^ "Decawave DW1000 Datasheet" (PDF).
  27. ^ "Decawave in Japan". Decawave Tech Forum. 2020-01-07. Retrieved 2020-07-28.
  28. ^ "Because Location Matters" (PDF).
  29. ^ "3db Access - Technology". www.3db-access.com. Retrieved 2020-07-28.
  30. ^ "CEVA Expands Its Market-Leading Wireless Connectivity Portfolio with New Ultra-Wideband Platform IP". June 24, 2021.
  31. ^ Paulose, Abraham (June 1994). "High Radar Range Resolution With the Step Frequency Waveform" (PDF). Defense Technical Information Center. Archived (PDF) from the original on November 1, 2019. Retrieved November 4, 2019.
  32. ^ Frenzel, Louis (November 11, 2002). "Ultrawideband Wireless: Not-So-New Technology Comes Into Its Own". Electronic Design. Retrieved November 4, 2019.
  33. ^ Fowler, Charles; Entzminger, John; Corum, James (November 1990). "Assessment of Ultra-Wideband (UWB) Technology" (PDF). Virginia Tech VLSI for Telecommunications. Retrieved November 4, 2019.
  34. ^ Ranney, Kenneth; Phelan, Brian; Sherbondy, Kelly; Getachew, Kirose; Smith, Gregory; Clark, John; Harrison, Arthur; Ressler, Marc; Nguyen, Lam; Narayan, Ram (May 1, 2017). Ranney, Kenneth I; Doerry, Armin (eds.). "Initial processing and analysis of forward- and side-looking data from the Spectrally Agile Frequency-Incrementing Reconfigurable (SAFIRE) radar". Radar Sensor Technology XXI. 10188: 101881J. Bibcode:2017SPIE10188E..1JR. doi:10.1117/12.2266270. S2CID 126161941.
  35. ^ Dogaru, Traian (March 2019). "Imaging Study for Small Unmanned Aerial Vehicle (UAV)-Mounted Ground-Penetrating Radar: Part I – Methodology and Analytic Formulation" (PDF). CCDC Army Research Laboratory.
  36. ^ Dogaru, Traian (March 2013). "Doppler Processing with Ultra-wideband (UWB) Impulse Radar". U.S. Army Research Laboratory.
  37. ^ Dogaru, Traian (January 1, 2018). "Doppler Processing with Ultra-Wideband (UWB) Radar Revisited". U.S. Army Research Laboratory – via Defense Technical Information Center.[dead link]
  38. ^ Ren, Lingyun; Wang, Haofei; Naishadham, Krishna; Kilic, Ozlem; Fathy, Aly (August 18, 2016). "Phase-Based Methods for Heart Rate Detection Using UWB Impulse Doppler Radar". IEEE Transactions on Microwave Theory and Techniques. 64 (10): 3319–3331. Bibcode:2016ITMTT..64.3319R. doi:10.1109/TMTT.2016.2597824. S2CID 10323361.
  39. ^ Ren, Lingyun; Tran, Nghia; Foroughian, Farnaz; Naishadham, Krishna; Piou, Jean; Kilic, Ozlem (May 8, 2018). "Short-Time State-Space Method for Micro-Doppler Identification of Walking Subject Using UWB Impulse Doppler Radar". IEEE Transactions on Microwave Theory and Techniques. 66 (7): 3521–3534. Bibcode:2018ITMTT..66.3521R. doi:10.1109/TMTT.2018.2829523. S2CID 49558032.
  40. ^ "Raybaby is a baby monitor that tracks your child's breathing". Engadget. Retrieved 2021-02-03.
  41. ^ "Time Domain Corp.'s sense-through-the-wall technology". timedomain.com. Retrieved 17 April 2018.
  42. ^ Thales Group's through-the-wall imaging system
  43. ^ Michal Aftanas Through-Wall Imaging with UWB Radar System Dissertation Thesis, 2009
  44. ^ "Performance of Ultra-Wideband Time-of-Arrival Estimation Enhanced With Synchronization Scheme" (PDF). Archived from the original (PDF) on 2011-07-26. Retrieved 2010-01-19.
  45. ^ Mroué, A.; Heddebaut, M.; Elbahhar, F.; Rivenq, A.; Rouvaen, J-M (2012). "Automatic radar target recognition of objects falling on railway tracks". Measurement Science and Technology. 23 (2): 025401. Bibcode:2012MeScT..23b5401M. doi:10.1088/0957-0233/23/2/025401.
  46. ^ "Ultra-WideBand - Possible Applications". Archived from the original on 2017-06-02. Retrieved 2013-11-23.
  47. ^ "IEEE 802.15 TG3a". www.ieee802.org. Retrieved 17 April 2018.
  48. ^ "IEEE 802.15.3a Project Authorization Request" (PDF). ieee.org. Retrieved 17 April 2018.
  49. ^ Tzero Technologies shuts down; that's the end of ultrawideband, VentureBeat
  50. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2006-03-21. Retrieved 2006-07-20.{{cite web}}: CS1 maint: archived copy as title (link)
  51. ^ "Archived copy" (PDF). Archived from the original (PDF) on 2007-09-30. Retrieved 2007-08-09.{{cite web}}: CS1 maint: archived copy as title (link)
  52. ^ Shaheen, Ehab M.; El-Tanany, Mohamed (2010). "The impact of narrowband interference on the performance of UWB systems in the IEEE802.15.3a channel models". Ccece 2010. pp. 1–6. doi:10.1109/CCECE.2010.5575235. ISBN 978-1-4244-5376-4. S2CID 36881282.
  53. ^ Kshetrimayum, R S, Panda, J R, Pillalamarri, R (2009). UWB printed monopole antenna with a notch frequency for coexistence with IEEE 802.11a WLAN devices. National Conference on Communications, pp. 59-63.
  54. ^ Sangam, R.S.; Kshetrimayum, R. S. (12 September 2018). "Notched UWB filter using exponential tapered impedance line stub loaded microstrip resonator". The Journal of Engineering. 2018 (9): 768–772. doi:10.1049/joe.2018.5071.

External linksEdit

  • IEEE 802.15.4a Includes a C-UWB physical layer, may be obtained from [1]
  • Standard ECMA-368 High Rate Ultra Wideband PHY and MAC Standard
  • Standard ECMA-369 MAC-PHY Interface for ECMA-368
  • Standard ISO/IEC 26907:2007
  • Standard ISO/IEC 26908:2007
  • ITU-R Recommendations – SM series See: RECOMMENDATION ITU R SM.1757 Impact of devices using ultra-wideband technology on systems operating within radiocommunication services.
  • FCC (GPO) Title 47, Section 15 of the Code of Federal Regulations Archived 2011-06-05 at the Wayback Machine SubPart F: Ultra-wideband
  • Use of MIMO techniques for UWB
  • Numerous useful links and resources regarding Ultra-Wideband and UWB testbeds – WCSP Group – University of South Florida (USF)
  • The Ultra-Wideband Radio Laboratory at the University of Southern California