NDLI: Ultra wide bandwidth (UWB): gigabit wireless communications for battery operated consumer applications

Content Provider	IEEE Xplore Digital Library
Author	McCorkle, J.
Copyright Year	2005
Description	Author affiliation: Freescale Semicond. Inc., Vienna, VA, USA (McCorkle, J.)
Abstract	Regulations legalizing UWB provide the first ever opportunity to build radios that suffer no Rayleigh fading. This fact has tremendous ramifications in classical thinking on communication architectures. For example, in all other comparisons between DS and OFDM, both systems had to operate in Rayleigh fading. But with UWB, the comparison is new. DS is not Rayleigh faded, giving it a marked advantage in terms of prime power, complexity, and speed*distance2 performance. With a low complexity (no multiply), rake and decision feed-forward/feed-back equalizer, DS is able to utilize more channel energy than its OFDM counterpart. And the equalizer allows operation at Gbps+ speeds. Though the DFE in DS-UWB chips is small (only 3% of the die, and 3% of the power budget in the XSI-110 chip set), beware, DS does not work at high speed without it. This talk addresses the history of UWB and the theoretical basis for its advantages in short-range high-speed applications. It also addresses the challenges the technology poses for implementation in a VLSI product, particularly regarding the implementation impacts of the two candidate proposals being considered for the IEEE 802.15.3a standard at the time of this writing; direct sequence (DS-UWB) (Kohno, McLaughlin and Welborn) and multi-band OFDM (MB-OFDM) [Batra et al.]. For example, to maximize network capacity and minimize power drain, it is advantageous for each user to burst at the highest possible data-rate, and thus leave more time for other users, and more time to sleep. But this bursting requires higher voltages which makes the design very sensitive to the peak-to-average power ratio (PAPR) at the IC pin. BPSK DS has the same PAPR at the IC pin as a sine wave-much lower than the noise-like signal of OFDM-allowing it to operate at much lower voltages and without a power amplifier. In a unique convergence of attributes serving the needs of multiple UWB applications and markets, DS eliminates fading without hardware, scales to Gbps+ speeds, is capable of full-power high-speed bursts in low-voltage low-cost silicon processes, and does these in a low-complexity small die. Continuing process refinements in low cost sub-micron CMOS, SiGe, and SOI solidify UWB as the technology of choice for battery powered ultra-high-speed short-range high-capacity wireless networks.
Sponsorship	Japan Soc. of Appl. Phys. IEEE Solid-State Circuits Soc
Starting Page	6
Ending Page	9
File Size	472662
Page Count	4
File Format	PDF
ISBN	490078401X
DOI	10.1109/VLSIC.2005.1469321
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-16
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	JSAP
Subject Keyword	Bandwidth Wireless communication Batteries OFDM Peak to average power ratio Rayleigh channels Equalizers Voltage Integrated circuit noise Feedforward systems
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Synchronization acquisition threshold based on peak-to-average ratio of correlation energy for UWB communications

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